/drupal7/includes/database/query.inc - Club Drupal - Forge Centrale Marseille

root / drupal7 / includes / database / query.inc @ 01dfd3b5

       <?php
       /**
        * @addtogroup database
        * @{
        */
       /**
        * @file
        * Non-specific Database query code. Used by all engines.
        */
       /**
        * Interface for a conditional clause in a query.
        */
       interface QueryConditionInterface {
         /**
          * Helper function: builds the most common conditional clauses.
+         *
          * This method can take a variable number of parameters. If called with two
          * parameters, they are taken as $field and $value with $operator having a
          * value of IN if $value is an array and = otherwise.
+         *
          * Do not use this method to test for NULL values. Instead, use
          * QueryConditionInterface::isNull() or QueryConditionInterface::isNotNull().
+         *
          * @param $field
          *   The name of the field to check. If you would like to add a more complex
          *   condition involving operators or functions, use where().
          * @param $value
          *   The value to test the field against. In most cases, this is a scalar.
          *   For more complex options, it is an array. The meaning of each element in
          *   the array is dependent on the $operator.
          * @param $operator
          *   The comparison operator, such as =, <, or >=. It also accepts more
          *   complex options such as IN, LIKE, or BETWEEN. Defaults to IN if $value is
          *   an array, and = otherwise.
+         *
          * @return QueryConditionInterface
          *   The called object.
+         *
          * @see QueryConditionInterface::isNull()
          * @see QueryConditionInterface::isNotNull()
          */
         public function condition($field, $value = NULL, $operator = NULL);
         /**
          * Adds an arbitrary WHERE clause to the query.
+         *
          * @param $snippet
          *   A portion of a WHERE clause as a prepared statement. It must use named
          *   placeholders, not ? placeholders.
          * @param $args
          *   An associative array of arguments.
+         *
          * @return QueryConditionInterface
          *   The called object.
          */
         public function where($snippet, $args = array());
         /**
          * Sets a condition that the specified field be NULL.
+         *
          * @param $field
          *   The name of the field to check.
+         *
          * @return QueryConditionInterface
          *   The called object.
          */
         public function isNull($field);
         /**
          * Sets a condition that the specified field be NOT NULL.
+         *
          * @param $field
          *   The name of the field to check.
+         *
          * @return QueryConditionInterface
          *   The called object.
          */
         public function isNotNull($field);
         /**
          * Sets a condition that the specified subquery returns values.
+         *
          * @param SelectQueryInterface $select
          *   The subquery that must contain results.
+         *
          * @return QueryConditionInterface
          *   The called object.
          */
         public function exists(SelectQueryInterface $select);
         /**
          * Sets a condition that the specified subquery returns no values.
+         *
          * @param SelectQueryInterface $select
          *   The subquery that must not contain results.
+         *
          * @return QueryConditionInterface
          *   The called object.
          */
         public function notExists(SelectQueryInterface $select);
         /**
          * Gets a complete list of all conditions in this conditional clause.
+         *
          * This method returns by reference. That allows alter hooks to access the
          * data structure directly and manipulate it before it gets compiled.
+         *
          * The data structure that is returned is an indexed array of entries, where
          * each entry looks like the following:
          * @code
          * array(
          *   'field' => $field,
          *   'value' => $value,
          *   'operator' => $operator,
          * );
          * @endcode
+         *
          * In the special case that $operator is NULL, the $field is taken as a raw
          * SQL snippet (possibly containing a function) and $value is an associative
          * array of placeholders for the snippet.
+         *
          * There will also be a single array entry of #conjunction, which is the
          * conjunction that will be applied to the array, such as AND.
          */
         public function &conditions();
         /**
          * Gets a complete list of all values to insert into the prepared statement.
+         *
          * @return
          *   An associative array of placeholders and values.
          */
         public function arguments();
         /**
          * Compiles the saved conditions for later retrieval.
+         *
          * This method does not return anything, but simply prepares data to be
          * retrieved via __toString() and arguments().
+         *
          * @param $connection
          *   The database connection for which to compile the conditionals.
          * @param $queryPlaceholder
          *   The query this condition belongs to. If not given, the current query is
          *   used.
          */
         public function compile(DatabaseConnection $connection, QueryPlaceholderInterface $queryPlaceholder);
         /**
          * Check whether a condition has been previously compiled.
+         *
          * @return
          *   TRUE if the condition has been previously compiled.
          */
         public function compiled();
+      }
       /**
        * Interface for a query that can be manipulated via an alter hook.
        */
       interface QueryAlterableInterface {
         /**
          * Adds a tag to a query.
+         *
          * Tags are strings that identify a query. A query may have any number of
          * tags. Tags are used to mark a query so that alter hooks may decide if they
          * wish to take action. Tags should be all lower-case and contain only
          * letters, numbers, and underscore, and start with a letter. That is, they
          * should follow the same rules as PHP identifiers in general.
+         *
          * @param $tag
          *   The tag to add.
+         *
          * @return QueryAlterableInterface
          *   The called object.
          */
         public function addTag($tag);
         /**
          * Determines if a given query has a given tag.
+         *
          * @param $tag
          *   The tag to check.
+         *
          * @return
          *   TRUE if this query has been marked with this tag, FALSE otherwise.
          */
         public function hasTag($tag);
         /**
          * Determines if a given query has all specified tags.
+         *
          * @param $tags
          *   A variable number of arguments, one for each tag to check.
+         *
          * @return
          *   TRUE if this query has been marked with all specified tags, FALSE
          *   otherwise.
          */
         public function hasAllTags();
         /**
          * Determines if a given query has any specified tag.
+         *
          * @param $tags
          *   A variable number of arguments, one for each tag to check.
+         *
          * @return
          *   TRUE if this query has been marked with at least one of the specified
          *   tags, FALSE otherwise.
          */
         public function hasAnyTag();
         /**
          * Adds additional metadata to the query.
+         *
          * Often, a query may need to provide additional contextual data to alter
          * hooks. Alter hooks may then use that information to decide if and how
          * to take action.
+         *
          * @param $key
          *   The unique identifier for this piece of metadata. Must be a string that
          *   follows the same rules as any other PHP identifier.
          * @param $object
          *   The additional data to add to the query. May be any valid PHP variable.
+         *
          * @return QueryAlterableInterface
          *   The called object.
          */
         public function addMetaData($key, $object);
         /**
          * Retrieves a given piece of metadata.
+         *
          * @param $key
          *   The unique identifier for the piece of metadata to retrieve.
+         *
          * @return
          *   The previously attached metadata object, or NULL if one doesn't exist.
          */
         public function getMetaData($key);
+      }
       /**
        * Interface for a query that accepts placeholders.
        */
       interface QueryPlaceholderInterface {
         /**
          * Returns a unique identifier for this object.
          */
         public function uniqueIdentifier();
         /**
          * Returns the next placeholder ID for the query.
+         *
          * @return
          *   The next available placeholder ID as an integer.
          */
         public function nextPlaceholder();
+      }
       /**
        * Base class for query builders.
+       *
        * Note that query builders use PHP's magic __toString() method to compile the
        * query object into a prepared statement.
        */
       abstract class Query implements QueryPlaceholderInterface {
         /**
          * The connection object on which to run this query.
+         *
          * @var DatabaseConnection
          */
         protected $connection;
         /**
          * The target of the connection object.
+         *
          * @var string
          */
         protected $connectionTarget;
         /**
          * The key of the connection object.
+         *
          * @var string
          */
         protected $connectionKey;
         /**
          * The query options to pass on to the connection object.
+         *
          * @var array
          */
         protected $queryOptions;
         /**
          * A unique identifier for this query object.
          */
         protected $uniqueIdentifier;
         /**
          * The placeholder counter.
          */
         protected $nextPlaceholder = 0;
         /**
          * An array of comments that can be prepended to a query.
+         *
          * @var array
          */
         protected $comments = array();
         /**
          * Constructs a Query object.
+         *
          * @param DatabaseConnection $connection
          *   Database connection object.
          * @param array $options
          *   Array of query options.
          */
         public function __construct(DatabaseConnection $connection, $options) {
           $this->uniqueIdentifier = uniqid('', TRUE);
           $this->connection = $connection;
           $this->connectionKey = $this->connection->getKey();
           $this->connectionTarget = $this->connection->getTarget();
           $this->queryOptions = $options;
+        }
         /**
          * Implements the magic __sleep function to disconnect from the database.
          */
         public function __sleep() {
           $keys = get_object_vars($this);
           unset($keys['connection']);
           return array_keys($keys);
+        }
         /**
          * Implements the magic __wakeup function to reconnect to the database.
          */
         public function __wakeup() {
           $this->connection = Database::getConnection($this->connectionTarget, $this->connectionKey);
+        }
         /**
          * Implements the magic __clone function.
          */
         public function __clone() {
           $this->uniqueIdentifier = uniqid('', TRUE);
+        }
         /**
          * Runs the query against the database.
          */
         abstract protected function execute();
         /**
          * Implements PHP magic __toString method to convert the query to a string.
+         *
          * The toString operation is how we compile a query object to a prepared
          * statement.
+         *
          * @return
          *   A prepared statement query string for this object.
          */
         abstract public function __toString();
         /**
          * Returns a unique identifier for this object.
          */
         public function uniqueIdentifier() {
           return $this->uniqueIdentifier;
+        }
         /**
          * Gets the next placeholder value for this query object.
+         *
          * @return int
          *   Next placeholder value.
          */
         public function nextPlaceholder() {
           return $this->nextPlaceholder++;
+        }
         /**
          * Adds a comment to the query.
+         *
          * By adding a comment to a query, you can more easily find it in your
          * query log or the list of active queries on an SQL server. This allows
          * for easier debugging and allows you to more easily find where a query
          * with a performance problem is being generated.
+         *
          * The comment string will be sanitized to remove * / and other characters
          * that may terminate the string early so as to avoid SQL injection attacks.
+         *
          * @param $comment
          *   The comment string to be inserted into the query.
+         *
          * @return Query
          *   The called object.
          */
         public function comment($comment) {
           $this->comments[] = $comment;
           return $this;
+        }
         /**
          * Returns a reference to the comments array for the query.
+         *
          * Because this method returns by reference, alter hooks may edit the comments
          * array directly to make their changes. If just adding comments, however, the
          * use of comment() is preferred.
+         *
          * Note that this method must be called by reference as well:
          * @code
          * $comments =& $query->getComments();
          * @endcode
+         *
          * @return
          *   A reference to the comments array structure.
          */
         public function &getComments() {
           return $this->comments;
+        }
+      }
       /**
        * General class for an abstracted INSERT query.
        */
       class InsertQuery extends Query {
         /**
          * The table on which to insert.
+         *
          * @var string
          */
         protected $table;
         /**
          * An array of fields on which to insert.
+         *
          * @var array
          */
         protected $insertFields = array();
         /**
          * An array of fields that should be set to their database-defined defaults.
+         *
          * @var array
          */
         protected $defaultFields = array();
         /**
          * A nested array of values to insert.
+         *
          * $insertValues is an array of arrays. Each sub-array is either an
          * associative array whose keys are field names and whose values are field
          * values to insert, or a non-associative array of values in the same order
          * as $insertFields.
+         *
          * Whether multiple insert sets will be run in a single query or multiple
          * queries is left to individual drivers to implement in whatever manner is
          * most appropriate. The order of values in each sub-array must match the
          * order of fields in $insertFields.
+         *
          * @var array
          */
         protected $insertValues = array();
         /**
          * A SelectQuery object to fetch the rows that should be inserted.
+         *
          * @var SelectQueryInterface
          */
         protected $fromQuery;
         /**
          * Constructs an InsertQuery object.
+         *
          * @param DatabaseConnection $connection
          *   A DatabaseConnection object.
          * @param string $table
          *   Name of the table to associate with this query.
          * @param array $options
          *   Array of database options.
          */
         public function __construct($connection, $table, array $options = array()) {
           if (!isset($options['return'])) {
             $options['return'] = Database::RETURN_INSERT_ID;
+          }
           parent::__construct($connection, $options);
           $this->table = $table;
+        }
         /**
          * Adds a set of field->value pairs to be inserted.
+         *
          * This method may only be called once. Calling it a second time will be
          * ignored. To queue up multiple sets of values to be inserted at once,
          * use the values() method.
+         *
          * @param $fields
          *   An array of fields on which to insert. This array may be indexed or
          *   associative. If indexed, the array is taken to be the list of fields.
          *   If associative, the keys of the array are taken to be the fields and
          *   the values are taken to be corresponding values to insert. If a
          *   $values argument is provided, $fields must be indexed.
          * @param $values
          *   An array of fields to insert into the database. The values must be
          *   specified in the same order as the $fields array.
+         *
          * @return InsertQuery
          *   The called object.
          */
         public function fields(array $fields, array $values = array()) {
           if (empty($this->insertFields)) {
             if (empty($values)) {
               if (!is_numeric(key($fields))) {
                 $values = array_values($fields);
                 $fields = array_keys($fields);
+              }
+            }
             $this->insertFields = $fields;
             if (!empty($values)) {
               $this->insertValues[] = $values;
+            }
+          }
           return $this;
+        }
         /**
          * Adds another set of values to the query to be inserted.
+         *
          * If $values is a numeric-keyed array, it will be assumed to be in the same
          * order as the original fields() call. If it is associative, it may be
          * in any order as long as the keys of the array match the names of the
          * fields.
+         *
          * @param $values
          *   An array of values to add to the query.
+         *
          * @return InsertQuery
          *   The called object.
          */
         public function values(array $values) {
           if (is_numeric(key($values))) {
             $this->insertValues[] = $values;
+          }
           else {
             // Reorder the submitted values to match the fields array.
             foreach ($this->insertFields as $key) {
               $insert_values[$key] = $values[$key];
+            }
             // For consistency, the values array is always numerically indexed.
             $this->insertValues[] = array_values($insert_values);
+          }
           return $this;
+        }
         /**
          * Specifies fields for which the database defaults should be used.
+         *
          * If you want to force a given field to use the database-defined default,
          * not NULL or undefined, use this method to instruct the database to use
          * default values explicitly. In most cases this will not be necessary
          * unless you are inserting a row that is all default values, as you cannot
          * specify no values in an INSERT query.
+         *
          * Specifying a field both in fields() and in useDefaults() is an error
          * and will not execute.
+         *
          * @param $fields
          *   An array of values for which to use the default values
          *   specified in the table definition.
+         *
          * @return InsertQuery
          *   The called object.
          */
         public function useDefaults(array $fields) {
           $this->defaultFields = $fields;
           return $this;
+        }
         /**
          * Sets the fromQuery on this InsertQuery object.
+         *
          * @param SelectQueryInterface $query
          *   The query to fetch the rows that should be inserted.
+         *
          * @return InsertQuery
          *   The called object.
          */
         public function from(SelectQueryInterface $query) {
           $this->fromQuery = $query;
           return $this;
+        }
         /**
          * Executes the insert query.
+         *
          * @return
          *   The last insert ID of the query, if one exists. If the query
          *   was given multiple sets of values to insert, the return value is
          *   undefined. If no fields are specified, this method will do nothing and
          *   return NULL. That makes it safe to use in multi-insert loops.
          */
         public function execute() {
           // If validation fails, simply return NULL. Note that validation routines
           // in preExecute() may throw exceptions instead.
           if (!$this->preExecute()) {
             return NULL;
+          }
           // If we're selecting from a SelectQuery, finish building the query and
           // pass it back, as any remaining options are irrelevant.
           if (!empty($this->fromQuery)) {
             $sql = (string) $this;
             // The SelectQuery may contain arguments, load and pass them through.
             return $this->connection->query($sql, $this->fromQuery->getArguments(), $this->queryOptions);
+          }
           $last_insert_id = 0;
           // Each insert happens in its own query in the degenerate case. However,
           // we wrap it in a transaction so that it is atomic where possible. On many
           // databases, such as SQLite, this is also a notable performance boost.
           $transaction = $this->connection->startTransaction();
           try {
             $sql = (string) $this;
             foreach ($this->insertValues as $insert_values) {
               $last_insert_id = $this->connection->query($sql, $insert_values, $this->queryOptions);
+            }
+          }
           catch (Exception $e) {
             // One of the INSERTs failed, rollback the whole batch.
             $transaction->rollback();
             // Rethrow the exception for the calling code.
             throw $e;
+          }
           // Re-initialize the values array so that we can re-use this query.
           $this->insertValues = array();
           // Transaction commits here where $transaction looses scope.
           return $last_insert_id;
+        }
         /**
          * Implements PHP magic __toString method to convert the query to a string.
+         *
          * @return string
          *   The prepared statement.
          */
         public function __toString() {
           // Create a sanitized comment string to prepend to the query.
           $comments = $this->connection->makeComment($this->comments);
           // Default fields are always placed first for consistency.
           $insert_fields = array_merge($this->defaultFields, $this->insertFields);
           if (!empty($this->fromQuery)) {
             return $comments . 'INSERT INTO {' . $this->table . '} (' . implode(', ', $insert_fields) . ') ' . $this->fromQuery;
+          }
           // For simplicity, we will use the $placeholders array to inject
           // default keywords even though they are not, strictly speaking,
           // placeholders for prepared statements.
           $placeholders = array();
           $placeholders = array_pad($placeholders, count($this->defaultFields), 'default');
           $placeholders = array_pad($placeholders, count($this->insertFields), '?');
           return $comments . 'INSERT INTO {' . $this->table . '} (' . implode(', ', $insert_fields) . ') VALUES (' . implode(', ', $placeholders) . ')';
+        }
         /**
          * Preprocesses and validates the query.
+         *
          * @return
          *   TRUE if the validation was successful, FALSE if not.
+         *
          * @throws FieldsOverlapException
          * @throws NoFieldsException
          */
         public function preExecute() {
           // Confirm that the user did not try to specify an identical
           // field and default field.
           if (array_intersect($this->insertFields, $this->defaultFields)) {
             throw new FieldsOverlapException('You may not specify the same field to have a value and a schema-default value.');
+          }
           if (!empty($this->fromQuery)) {
             // We have to assume that the used aliases match the insert fields.
             // Regular fields are added to the query before expressions, maintain the
             // same order for the insert fields.
             // This behavior can be overridden by calling fields() manually as only the
             // first call to fields() does have an effect.
             $this->fields(array_merge(array_keys($this->fromQuery->getFields()), array_keys($this->fromQuery->getExpressions())));
+          }
           else {
             // Don't execute query without fields.
             if (count($this->insertFields) + count($this->defaultFields) == 0) {
               throw new NoFieldsException('There are no fields available to insert with.');
+            }
+          }
           // If no values have been added, silently ignore this query. This can happen
           // if values are added conditionally, so we don't want to throw an
           // exception.
           if (!isset($this->insertValues[0]) && count($this->insertFields) > 0 && empty($this->fromQuery)) {
             return FALSE;
+          }
           return TRUE;
+        }
+      }
       /**
        * General class for an abstracted DELETE operation.
        */
       class DeleteQuery extends Query implements QueryConditionInterface {
         /**
          * The table from which to delete.
+         *
          * @var string
          */
         protected $table;
         /**
          * The condition object for this query.
+         *
          * Condition handling is handled via composition.
+         *
          * @var DatabaseCondition
          */
         protected $condition;
         /**
          * Constructs a DeleteQuery object.
+         *
          * @param DatabaseConnection $connection
          *   A DatabaseConnection object.
          * @param string $table
          *   Name of the table to associate with this query.
          * @param array $options
          *   Array of database options.
          */
         public function __construct(DatabaseConnection $connection, $table, array $options = array()) {
           $options['return'] = Database::RETURN_AFFECTED;
           parent::__construct($connection, $options);
           $this->table = $table;
           $this->condition = new DatabaseCondition('AND');
+        }
         /**
          * Implements QueryConditionInterface::condition().
          */
         public function condition($field, $value = NULL, $operator = NULL) {
           $this->condition->condition($field, $value, $operator);
           return $this;
+        }
         /**
          * Implements QueryConditionInterface::isNull().
          */
         public function isNull($field) {
           $this->condition->isNull($field);
           return $this;
+        }
         /**
          * Implements QueryConditionInterface::isNotNull().
          */
         public function isNotNull($field) {
           $this->condition->isNotNull($field);
           return $this;
+        }
         /**
          * Implements QueryConditionInterface::exists().
          */
         public function exists(SelectQueryInterface $select) {
           $this->condition->exists($select);
           return $this;
+        }
         /**
          * Implements QueryConditionInterface::notExists().
          */
         public function notExists(SelectQueryInterface $select) {
           $this->condition->notExists($select);
           return $this;
+        }
         /**
          * Implements QueryConditionInterface::conditions().
          */
         public function &conditions() {
           return $this->condition->conditions();
+        }
         /**
          * Implements QueryConditionInterface::arguments().
          */
         public function arguments() {
           return $this->condition->arguments();
+        }
         /**
          * Implements QueryConditionInterface::where().
          */
         public function where($snippet, $args = array()) {
           $this->condition->where($snippet, $args);
           return $this;
+        }
         /**
          * Implements QueryConditionInterface::compile().
          */
         public function compile(DatabaseConnection $connection, QueryPlaceholderInterface $queryPlaceholder) {
           return $this->condition->compile($connection, $queryPlaceholder);
+        }
         /**
          * Implements QueryConditionInterface::compiled().
          */
         public function compiled() {
           return $this->condition->compiled();
+        }
         /**
          * Executes the DELETE query.
+         *
          * @return int
          *   The number of rows affected by the delete query.
          */
         public function execute() {
           $values = array();
           if (count($this->condition)) {
             $this->condition->compile($this->connection, $this);
             $values = $this->condition->arguments();
+          }
           return $this->connection->query((string) $this, $values, $this->queryOptions);
+        }
         /**
          * Implements PHP magic __toString method to convert the query to a string.
+         *
          * @return string
          *   The prepared statement.
          */
         public function __toString() {
           // Create a sanitized comment string to prepend to the query.
           $comments = $this->connection->makeComment($this->comments);
           $query = $comments . 'DELETE FROM {' . $this->connection->escapeTable($this->table) . '} ';
           if (count($this->condition)) {
             $this->condition->compile($this->connection, $this);
             $query .= "\nWHERE " . $this->condition;
+          }
           return $query;
+        }
+      }
       /**
        * General class for an abstracted TRUNCATE operation.
        */
       class TruncateQuery extends Query {
         /**
          * The table to truncate.
+         *
          * @var string
          */
         protected $table;
         /**
          * Constructs a TruncateQuery object.
+         *
          * @param DatabaseConnection $connection
          *   A DatabaseConnection object.
          * @param string $table
          *   Name of the table to associate with this query.
          * @param array $options
          *   Array of database options.
          */
         public function __construct(DatabaseConnection $connection, $table, array $options = array()) {
           $options['return'] = Database::RETURN_AFFECTED;
           parent::__construct($connection, $options);
           $this->table = $table;
+        }
         /**
          * Implements QueryConditionInterface::compile().
          */
         public function compile(DatabaseConnection $connection, QueryPlaceholderInterface $queryPlaceholder) {
           return $this->condition->compile($connection, $queryPlaceholder);
+        }
         /**
          * Implements QueryConditionInterface::compiled().
          */
         public function compiled() {
           return $this->condition->compiled();
+        }
         /**
          * Executes the TRUNCATE query.
+         *
          * @return
          *   Return value is dependent on the database type.
          */
         public function execute() {
           return $this->connection->query((string) $this, array(), $this->queryOptions);
+        }
         /**
          * Implements PHP magic __toString method to convert the query to a string.
+         *
          * @return string
          *   The prepared statement.
          */
         public function __toString() {
           // Create a sanitized comment string to prepend to the query.
           $comments = $this->connection->makeComment($this->comments);
           // In most cases, TRUNCATE is not a transaction safe statement as it is a
           // DDL statement which results in an implicit COMMIT. When we are in a
           // transaction, fallback to the slower, but transactional, DELETE.
           // PostgreSQL also locks the entire table for a TRUNCATE strongly reducing
           // the concurrency with other transactions.
           if ($this->connection->inTransaction()) {
             return $comments . 'DELETE FROM {' . $this->connection->escapeTable($this->table) . '}';
+          }
           else {
             return $comments . 'TRUNCATE {' . $this->connection->escapeTable($this->table) . '} ';
+          }
+        }
+      }
       /**
        * General class for an abstracted UPDATE operation.
        */
       class UpdateQuery extends Query implements QueryConditionInterface {
         /**
          * The table to update.
+         *
          * @var string
          */
         protected $table;
         /**
          * An array of fields that will be updated.
+         *
          * @var array
          */
         protected $fields = array();
         /**
          * An array of values to update to.
+         *
          * @var array
          */
         protected $arguments = array();
         /**
          * The condition object for this query.
+         *
          * Condition handling is handled via composition.
+         *
          * @var DatabaseCondition
          */
         protected $condition;
         /**
          * Array of fields to update to an expression in case of a duplicate record.
+         *
          * This variable is a nested array in the following format:
          * @code
          * <some field> => array(
          *  'condition' => <condition to execute, as a string>,
          *  'arguments' => <array of arguments for condition, or NULL for none>,
          * );
          * @endcode
+         *
          * @var array
          */
         protected $expressionFields = array();
         /**
          * Constructs an UpdateQuery object.
+         *
          * @param DatabaseConnection $connection
          *   A DatabaseConnection object.
          * @param string $table
          *   Name of the table to associate with this query.
          * @param array $options
          *   Array of database options.
          */
         public function __construct(DatabaseConnection $connection, $table, array $options = array()) {
           $options['return'] = Database::RETURN_AFFECTED;
           parent::__construct($connection, $options);
           $this->table = $table;
           $this->condition = new DatabaseCondition('AND');
+        }
         /**
          * Implements QueryConditionInterface::condition().
          */
         public function condition($field, $value = NULL, $operator = NULL) {
           $this->condition->condition($field, $value, $operator);
           return $this;
+        }
         /**
          * Implements QueryConditionInterface::isNull().
          */
         public function isNull($field) {
           $this->condition->isNull($field);
           return $this;
+        }
         /**
          * Implements QueryConditionInterface::isNotNull().
          */
         public function isNotNull($field) {
           $this->condition->isNotNull($field);
           return $this;
+        }
         /**
          * Implements QueryConditionInterface::exists().
          */
         public function exists(SelectQueryInterface $select) {
           $this->condition->exists($select);
           return $this;
+        }
         /**
          * Implements QueryConditionInterface::notExists().
          */
         public function notExists(SelectQueryInterface $select) {
           $this->condition->notExists($select);
           return $this;
+        }
         /**
          * Implements QueryConditionInterface::conditions().
          */
         public function &conditions() {
           return $this->condition->conditions();
+        }
         /**
          * Implements QueryConditionInterface::arguments().
          */
         public function arguments() {
           return $this->condition->arguments();
+        }
         /**
          * Implements QueryConditionInterface::where().
          */
         public function where($snippet, $args = array()) {
           $this->condition->where($snippet, $args);
           return $this;
+        }
         /**
          * Implements QueryConditionInterface::compile().
          */
         public function compile(DatabaseConnection $connection, QueryPlaceholderInterface $queryPlaceholder) {
           return $this->condition->compile($connection, $queryPlaceholder);
+        }
         /**
          * Implements QueryConditionInterface::compiled().
          */
         public function compiled() {
           return $this->condition->compiled();
+        }
         /**
          * Adds a set of field->value pairs to be updated.
+         *
          * @param $fields
          *   An associative array of fields to write into the database. The array keys
          *   are the field names and the values are the values to which to set them.
+         *
          * @return UpdateQuery
          *   The called object.
          */
         public function fields(array $fields) {
           $this->fields = $fields;
           return $this;
+        }
         /**
          * Specifies fields to be updated as an expression.
+         *
          * Expression fields are cases such as counter=counter+1. This method takes
          * precedence over fields().
+         *
          * @param $field
          *   The field to set.
          * @param $expression
          *   The field will be set to the value of this expression. This parameter
          *   may include named placeholders.
          * @param $arguments
          *   If specified, this is an array of key/value pairs for named placeholders
          *   corresponding to the expression.
+         *
          * @return UpdateQuery
          *   The called object.
          */
         public function expression($field, $expression, array $arguments = NULL) {
           $this->expressionFields[$field] = array(
             'expression' => $expression,
             'arguments' => $arguments,
           );
           return $this;
+        }
         /**
          * Executes the UPDATE query.
+         *
          * @return
          *   The number of rows affected by the update.
          */
         public function execute() {
           // Expressions take priority over literal fields, so we process those first
           // and remove any literal fields that conflict.
           $fields = $this->fields;
           $update_values = array();
           foreach ($this->expressionFields as $field => $data) {
             if (!empty($data['arguments'])) {
               $update_values += $data['arguments'];
+            }
             unset($fields[$field]);
+          }
           // Because we filter $fields the same way here and in __toString(), the
           // placeholders will all match up properly.
           $max_placeholder = 0;
           foreach ($fields as $field => $value) {
             $update_values[':db_update_placeholder_' . ($max_placeholder++)] = $value;
+          }
           if (count($this->condition)) {
             $this->condition->compile($this->connection, $this);
             $update_values = array_merge($update_values, $this->condition->arguments());
+          }
           return $this->connection->query((string) $this, $update_values, $this->queryOptions);
+        }
         /**
          * Implements PHP magic __toString method to convert the query to a string.
+         *
          * @return string
          *   The prepared statement.
          */
         public function __toString() {
           // Create a sanitized comment string to prepend to the query.
           $comments = $this->connection->makeComment($this->comments);
           // Expressions take priority over literal fields, so we process those first
           // and remove any literal fields that conflict.
           $fields = $this->fields;
           $update_fields = array();
           foreach ($this->expressionFields as $field => $data) {
             $update_fields[] = $field . '=' . $data['expression'];
             unset($fields[$field]);
+          }
           $max_placeholder = 0;
           foreach ($fields as $field => $value) {
             $update_fields[] = $field . '=:db_update_placeholder_' . ($max_placeholder++);
+          }
           $query = $comments . 'UPDATE {' . $this->connection->escapeTable($this->table) . '} SET ' . implode(', ', $update_fields);
           if (count($this->condition)) {
             $this->condition->compile($this->connection, $this);
             // There is an implicit string cast on $this->condition.
             $query .= "\nWHERE " . $this->condition;
+          }
           return $query;
+        }
+      }
       /**
        * General class for an abstracted MERGE query operation.
+       *
        * An ANSI SQL:2003 compatible database would run the following query:
+       *
        * @code
        * MERGE INTO table_name_1 USING table_name_2 ON (condition)
        *   WHEN MATCHED THEN
        *   UPDATE SET column1 = value1 [, column2 = value2 ...]
        *   WHEN NOT MATCHED THEN
        *   INSERT (column1 [, column2 ...]) VALUES (value1 [, value2 ...
        * @endcode
+       *
        * Other databases (most notably MySQL, PostgreSQL and SQLite) will emulate
        * this statement by running a SELECT and then INSERT or UPDATE.
+       *
        * By default, the two table names are identical and they are passed into the
        * the constructor. table_name_2 can be specified by the
        * MergeQuery::conditionTable() method. It can be either a string or a
        * subquery.
+       *
        * The condition is built exactly like SelectQuery or UpdateQuery conditions,
        * the UPDATE query part is built similarly like an UpdateQuery and finally the
        * INSERT query part is built similarly like an InsertQuery. However, both
        * UpdateQuery and InsertQuery has a fields method so
        * MergeQuery::updateFields() and MergeQuery::insertFields() needs to be called
        * instead. MergeQuery::fields() can also be called which calls both of these
        * methods as the common case is to use the same column-value pairs for both
        * INSERT and UPDATE. However, this is not mandatory. Another convenient
        * wrapper is MergeQuery::key() which adds the same column-value pairs to the
        * condition and the INSERT query part.
+       *
        * Several methods (key(), fields(), insertFields()) can be called to set a
        * key-value pair for the INSERT query part. Subsequent calls for the same
        * fields override the earlier ones. The same is true for UPDATE and key(),
        * fields() and updateFields().
        */
       class MergeQuery extends Query implements QueryConditionInterface {
         /**
          * Returned by execute() if an INSERT query has been executed.
          */
         const STATUS_INSERT = 1;
         /**
          * Returned by execute() if an UPDATE query has been executed.
          */
         const STATUS_UPDATE = 2;
         /**
          * The table to be used for INSERT and UPDATE.
+         *
          * @var string
          */
         protected $table;
         /**
          * The table or subquery to be used for the condition.
          */
         protected $conditionTable;
         /**
          * An array of fields on which to insert.
+         *
          * @var array
          */
         protected $insertFields = array();
         /**
          * An array of fields which should be set to their database-defined defaults.
+         *
          * Used on INSERT.
+         *
          * @var array
          */
         protected $defaultFields = array();
         /**
          * An array of values to be inserted.
+         *
          * @var string
          */
         protected $insertValues = array();
         /**
          * An array of fields that will be updated.
+         *
          * @var array
          */
         protected $updateFields = array();
         /**
          * Array of fields to update to an expression in case of a duplicate record.
+         *
          * This variable is a nested array in the following format:
          * @code
          * <some field> => array(
          *  'condition' => <condition to execute, as a string>,
          *  'arguments' => <array of arguments for condition, or NULL for none>,
          * );
          * @endcode
+         *
          * @var array
          */
         protected $expressionFields = array();
         /**
          * Flag indicating whether an UPDATE is necessary.
+         *
          * @var boolean
          */
         protected $needsUpdate = FALSE;
         /**
         * Constructs a MergeQuery object.
+        *
         * @param DatabaseConnection $connection
         *   A DatabaseConnection object.
         * @param string $table
         *   Name of the table to associate with this query.
         * @param array $options
         *   Array of database options.
         */
         public function __construct(DatabaseConnection $connection, $table, array $options = array()) {
           $options['return'] = Database::RETURN_AFFECTED;
           parent::__construct($connection, $options);
           $this->table = $table;
           $this->conditionTable = $table;
           $this->condition = new DatabaseCondition('AND');
+        }
         /**
          * Sets the table or subquery to be used for the condition.
+         *
          * @param $table
          *   The table name or the subquery to be used. Use a SelectQuery object to
          *   pass in a subquery.
+         *
          * @return MergeQuery
          *   The called object.
          */
         protected function conditionTable($table) {
           $this->conditionTable = $table;
           return $this;
+        }
         /**
          * Adds a set of field->value pairs to be updated.
+         *
          * @param $fields
          *   An associative array of fields to write into the database. The array keys
          *   are the field names and the values are the values to which to set them.
+         *
          * @return MergeQuery
          *   The called object.
          */
         public function updateFields(array $fields) {
           $this->updateFields = $fields;
           $this->needsUpdate = TRUE;
           return $this;
+        }
         /**
          * Specifies fields to be updated as an expression.
+         *
          * Expression fields are cases such as counter = counter + 1. This method
          * takes precedence over MergeQuery::updateFields() and it's wrappers,
          * MergeQuery::key() and MergeQuery::fields().
+         *
          * @param $field
          *   The field to set.
          * @param $expression
          *   The field will be set to the value of this expression. This parameter
          *   may include named placeholders.
          * @param $arguments
          *   If specified, this is an array of key/value pairs for named placeholders
          *   corresponding to the expression.
+         *
          * @return MergeQuery
          *   The called object.
          */
         public function expression($field, $expression, array $arguments = NULL) {
           $this->expressionFields[$field] = array(
             'expression' => $expression,
             'arguments' => $arguments,
           );
           $this->needsUpdate = TRUE;
           return $this;
+        }
         /**
          * Adds a set of field->value pairs to be inserted.
+         *
          * @param $fields
          *   An array of fields on which to insert. This array may be indexed or
          *   associative. If indexed, the array is taken to be the list of fields.
          *   If associative, the keys of the array are taken to be the fields and
          *   the values are taken to be corresponding values to insert. If a
          *   $values argument is provided, $fields must be indexed.
          * @param $values
          *   An array of fields to insert into the database. The values must be
          *   specified in the same order as the $fields array.
+         *
          * @return MergeQuery
          *   The called object.
          */
         public function insertFields(array $fields, array $values = array()) {
           if ($values) {
             $fields = array_combine($fields, $values);
+          }
           $this->insertFields = $fields;
           return $this;
+        }
         /**
          * Specifies fields for which the database-defaults should be used.
+         *
          * If you want to force a given field to use the database-defined default,
          * not NULL or undefined, use this method to instruct the database to use
          * default values explicitly. In most cases this will not be necessary
          * unless you are inserting a row that is all default values, as you cannot
          * specify no values in an INSERT query.
+         *
          * Specifying a field both in fields() and in useDefaults() is an error
          * and will not execute.
+         *
          * @param $fields
          *   An array of values for which to use the default values
          *   specified in the table definition.
+         *
          * @return MergeQuery
          *   The called object.
          */
         public function useDefaults(array $fields) {
           $this->defaultFields = $fields;
           return $this;
+        }
         /**
          * Sets common field-value pairs in the INSERT and UPDATE query parts.
+         *
          * This method should only be called once. It may be called either
          * with a single associative array or two indexed arrays. If called
          * with an associative array, the keys are taken to be the fields
          * and the values are taken to be the corresponding values to set.
          * If called with two arrays, the first array is taken as the fields
          * and the second array is taken as the corresponding values.
+         *
          * @param $fields
          *   An array of fields to insert, or an associative array of fields and
          *   values. The keys of the array are taken to be the fields and the values
          *   are taken to be corresponding values to insert.
          * @param $values
          *   An array of values to set into the database. The values must be
          *   specified in the same order as the $fields array.
+         *
          * @return MergeQuery
          *   The called object.
          */
         public function fields(array $fields, array $values = array()) {
           if ($values) {
             $fields = array_combine($fields, $values);
+          }
           foreach ($fields as $key => $value) {
             $this->insertFields[$key] = $value;
             $this->updateFields[$key] = $value;
+          }
           $this->needsUpdate = TRUE;
           return $this;
+        }
         /**
          * Sets the key field(s) to be used as conditions for this query.
+         *
          * This method should only be called once. It may be called either
          * with a single associative array or two indexed arrays. If called
          * with an associative array, the keys are taken to be the fields
          * and the values are taken to be the corresponding values to set.
          * If called with two arrays, the first array is taken as the fields
          * and the second array is taken as the corresponding values.
+         *
          * The fields are copied to the condition of the query and the INSERT part.
          * If no other method is called, the UPDATE will become a no-op.
+         *
          * @param $fields
          *   An array of fields to set, or an associative array of fields and values.
          * @param $values
          *   An array of values to set into the database. The values must be
          *   specified in the same order as the $fields array.
+         *
          * @return MergeQuery
          *   The called object.
          */
         public function key(array $fields, array $values = array()) {
           if ($values) {
             $fields = array_combine($fields, $values);
+          }
           foreach ($fields as $key => $value) {
             $this->insertFields[$key] = $value;
             $this->condition($key, $value);
+          }
           return $this;
+        }
         /**
          * Implements QueryConditionInterface::condition().
          */
         public function condition($field, $value = NULL, $operator = NULL) {
           $this->condition->condition($field, $value, $operator);
           return $this;
+        }
         /**
          * Implements QueryConditionInterface::isNull().
          */
         public function isNull($field) {
           $this->condition->isNull($field);
           return $this;
+        }
         /**
          * Implements QueryConditionInterface::isNotNull().
          */
         public function isNotNull($field) {
           $this->condition->isNotNull($field);
           return $this;
+        }
         /**
          * Implements QueryConditionInterface::exists().
          */
         public function exists(SelectQueryInterface $select) {
           $this->condition->exists($select);
           return $this;
+        }
         /**
          * Implements QueryConditionInterface::notExists().
          */
         public function notExists(SelectQueryInterface $select) {
           $this->condition->notExists($select);
           return $this;
+        }
         /**
          * Implements QueryConditionInterface::conditions().
          */
         public function &conditions() {
           return $this->condition->conditions();
+        }
         /**
          * Implements QueryConditionInterface::arguments().
          */
         public function arguments() {
           return $this->condition->arguments();
+        }
         /**
          * Implements QueryConditionInterface::where().
          */
         public function where($snippet, $args = array()) {
           $this->condition->where($snippet, $args);
           return $this;
+        }
         /**
          * Implements QueryConditionInterface::compile().
          */
         public function compile(DatabaseConnection $connection, QueryPlaceholderInterface $queryPlaceholder) {
           return $this->condition->compile($connection, $queryPlaceholder);
+        }
         /**
          * Implements QueryConditionInterface::compiled().
          */
         public function compiled() {
           return $this->condition->compiled();
+        }
         /**
          * Implements PHP magic __toString method to convert the query to a string.
+         *
          * In the degenerate case, there is no string-able query as this operation
          * is potentially two queries.
+         *
          * @return string
          *   The prepared query statement.
          */
         public function __toString() {
+        }
         public function execute() {
           if (!count($this->condition)) {
             throw new InvalidMergeQueryException(t('Invalid merge query: no conditions'));
+          }
           $select = $this->connection->select($this->conditionTable)
             ->condition($this->condition);
           $select->addExpression('1');
           if (!$select->execute()->fetchField()) {
             try {
               $insert = $this->connection->insert($this->table)->fields($this->insertFields);
               if ($this->defaultFields) {
                 $insert->useDefaults($this->defaultFields);
+              }
               $insert->execute();
               return self::STATUS_INSERT;
+            }
             catch (Exception $e) {
               // The insert query failed, maybe it's because a racing insert query
               // beat us in inserting the same row. Retry the select query, if it
               // returns a row, ignore the error and continue with the update
               // query below.
               if (!$select->execute()->fetchField()) {
                 throw $e;
+              }
+            }
+          }
           if ($this->needsUpdate) {
             $update = $this->connection->update($this->table)
               ->fields($this->updateFields)
               ->condition($this->condition);
             if ($this->expressionFields) {
               foreach ($this->expressionFields as $field => $data) {
                 $update->expression($field, $data['expression'], $data['arguments']);
+              }
+            }
             $update->execute();
             return self::STATUS_UPDATE;
+           }
+        }
+      }
       /**
        * Generic class for a series of conditions in a query.
        */
       class DatabaseCondition implements QueryConditionInterface, Countable {
         /**
          * Array of conditions.
+         *
          * @var array
          */
         protected $conditions = array();
         /**
          * Array of arguments.
+         *
          * @var array
          */
         protected $arguments = array();
         /**
          * Whether the conditions have been changed.
+         *
          * TRUE if the condition has been changed since the last compile.
          * FALSE if the condition has been compiled and not changed.
+         *
          * @var bool
          */
         protected $changed = TRUE;
         /**
          * The identifier of the query placeholder this condition has been compiled against.
          */
         protected $queryPlaceholderIdentifier;
         /**
          * Constructs a DataBaseCondition object.
+         *
          * @param string $conjunction
          *   The operator to use to combine conditions: 'AND' or 'OR'.
          */
         public function __construct($conjunction) {
           $this->conditions['#conjunction'] = $conjunction;
+        }
         /**
          * Implements Countable::count().
+         *
          * Returns the size of this conditional. The size of the conditional is the
          * size of its conditional array minus one, because one element is the
          * conjunction.
          */
         public function count() {
           return count($this->conditions) - 1;
+        }
         /**
          * Implements QueryConditionInterface::condition().
          */
         public function condition($field, $value = NULL, $operator = NULL) {
           if (!isset($operator)) {
             if (is_array($value)) {
               $operator = 'IN';
+            }
             elseif (!isset($value)) {
               $operator = 'IS NULL';
+            }
             else {
               $operator = '=';
+            }
+          }
           $this->conditions[] = array(
             'field' => $field,
             'value' => $value,
             'operator' => $operator,
           );
           $this->changed = TRUE;
           return $this;
+        }
         /**
          * Implements QueryConditionInterface::where().
          */
         public function where($snippet, $args = array()) {
           $this->conditions[] = array(
             'field' => $snippet,
             'value' => $args,
             'operator' => NULL,
           );
           $this->changed = TRUE;
           return $this;
+        }
         /**
          * Implements QueryConditionInterface::isNull().
          */
         public function isNull($field) {
           return $this->condition($field);
+        }
         /**
          * Implements QueryConditionInterface::isNotNull().
          */
         public function isNotNull($field) {
           return $this->condition($field, NULL, 'IS NOT NULL');
+        }
         /**
          * Implements QueryConditionInterface::exists().
          */
         public function exists(SelectQueryInterface $select) {
           return $this->condition('', $select, 'EXISTS');
+        }
         /**
          * Implements QueryConditionInterface::notExists().
          */
         public function notExists(SelectQueryInterface $select) {
           return $this->condition('', $select, 'NOT EXISTS');
+        }
         /**
          * Implements QueryConditionInterface::conditions().
          */
         public function &conditions() {
           return $this->conditions;
+        }
         /**
          * Implements QueryConditionInterface::arguments().
          */
         public function arguments() {
           // If the caller forgot to call compile() first, refuse to run.
           if ($this->changed) {
             return NULL;
+          }
           return $this->arguments;
+        }
         /**
          * Implements QueryConditionInterface::compile().
          */
         public function compile(DatabaseConnection $connection, QueryPlaceholderInterface $queryPlaceholder) {
           // Re-compile if this condition changed or if we are compiled against a
           // different query placeholder object.
           if ($this->changed || isset($this->queryPlaceholderIdentifier) && ($this->queryPlaceholderIdentifier != $queryPlaceholder->uniqueIdentifier())) {
             $this->queryPlaceholderIdentifier = $queryPlaceholder->uniqueIdentifier();
             $condition_fragments = array();
             $arguments = array();
             $conditions = $this->conditions;
             $conjunction = $conditions['#conjunction'];
             unset($conditions['#conjunction']);
             foreach ($conditions as $condition) {
               if (empty($condition['operator'])) {
                 // This condition is a literal string, so let it through as is.
                 $condition_fragments[] = ' (' . $condition['field'] . ') ';
                 $arguments += $condition['value'];
+              }
               else {
                 // It's a structured condition, so parse it out accordingly.
                 // Note that $condition['field'] will only be an object for a dependent
                 // DatabaseCondition object, not for a dependent subquery.
                 if ($condition['field'] instanceof QueryConditionInterface) {
                   // Compile the sub-condition recursively and add it to the list.
                   $condition['field']->compile($connection, $queryPlaceholder);
                   $condition_fragments[] = '(' . (string) $condition['field'] . ')';
                   $arguments += $condition['field']->arguments();
+                }
                 else {
                   // For simplicity, we treat all operators as the same data structure.
                   // In the typical degenerate case, this won't get changed.
                   $operator_defaults = array(
                     'prefix' => '',
                     'postfix' => '',
                     'delimiter' => '',
                     'operator' => $condition['operator'],
                     'use_value' => TRUE,
                   );
                   $operator = $connection->mapConditionOperator($condition['operator']);
                   if (!isset($operator)) {
                     $operator = $this->mapConditionOperator($condition['operator']);
+                  }
                   $operator += $operator_defaults;
                   $placeholders = array();
                   if ($condition['value'] instanceof SelectQueryInterface) {
                     $condition['value']->compile($connection, $queryPlaceholder);
                     $placeholders[] = (string) $condition['value'];
                     $arguments += $condition['value']->arguments();
                     // Subqueries are the actual value of the operator, we don't
                     // need to add another below.
                     $operator['use_value'] = FALSE;
+                  }
                   // We assume that if there is a delimiter, then the value is an
                   // array. If not, it is a scalar. For simplicity, we first convert
                   // up to an array so that we can build the placeholders in the same way.
                   elseif (!$operator['delimiter']) {
                     $condition['value'] = array($condition['value']);
+                  }
                   if ($operator['use_value']) {
                     foreach ($condition['value'] as $value) {
                       $placeholder = ':db_condition_placeholder_' . $queryPlaceholder->nextPlaceholder();
                       $arguments[$placeholder] = $value;
                       $placeholders[] = $placeholder;
+                    }
+                  }
                   $condition_fragments[] = ' (' . $connection->escapeField($condition['field']) . ' ' . $operator['operator'] . ' ' . $operator['prefix'] . implode($operator['delimiter'], $placeholders) . $operator['postfix'] . ') ';
+                }
+              }
+            }
             $this->changed = FALSE;
             $this->stringVersion = implode($conjunction, $condition_fragments);
             $this->arguments = $arguments;
+          }
+        }
         /**
          * Implements QueryConditionInterface::compiled().
          */
         public function compiled() {
           return !$this->changed;
+        }
         /**
          * Implements PHP magic __toString method to convert the conditions to string.
+         *
          * @return string
          *   A string version of the conditions.
          */
         public function __toString() {
           // If the caller forgot to call compile() first, refuse to run.
           if ($this->changed) {
             return NULL;
+          }
           return $this->stringVersion;
+        }
         /**
          * PHP magic __clone() method.
+         *
          * Only copies fields that implement QueryConditionInterface. Also sets
          * $this->changed to TRUE.
          */
         function __clone() {
           $this->changed = TRUE;
           foreach ($this->conditions as $key => $condition) {
             if ($key !== '#conjunction') {
               if ($condition['field'] instanceOf QueryConditionInterface) {
                 $this->conditions[$key]['field'] = clone($condition['field']);
+              }
               if ($condition['value'] instanceOf SelectQueryInterface) {
                 $this->conditions[$key]['value'] = clone($condition['value']);
+              }
+            }
+          }
+        }
         /**
          * Gets any special processing requirements for the condition operator.
+         *
          * Some condition types require special processing, such as IN, because
          * the value data they pass in is not a simple value. This is a simple
          * overridable lookup function.
+         *
          * @param $operator
          *   The condition operator, such as "IN", "BETWEEN", etc. Case-sensitive.
+         *
          * @return
          *   The extra handling directives for the specified operator, or NULL.
          */
         protected function mapConditionOperator($operator) {
           // $specials does not use drupal_static as its value never changes.
           static $specials = array(
             'BETWEEN' => array('delimiter' => ' AND '),
             'IN' => array('delimiter' => ', ', 'prefix' => ' (', 'postfix' => ')'),
             'NOT IN' => array('delimiter' => ', ', 'prefix' => ' (', 'postfix' => ')'),
             'EXISTS' => array('prefix' => ' (', 'postfix' => ')'),
             'NOT EXISTS' => array('prefix' => ' (', 'postfix' => ')'),
             'IS NULL' => array('use_value' => FALSE),
             'IS NOT NULL' => array('use_value' => FALSE),
             // Use backslash for escaping wildcard characters.
             'LIKE' => array('postfix' => " ESCAPE '\\\\'"),
             'NOT LIKE' => array('postfix' => " ESCAPE '\\\\'"),
             // These ones are here for performance reasons.
             '=' => array(),
             '<' => array(),
             '>' => array(),
             '>=' => array(),
             '<=' => array(),
           );
           if (isset($specials[$operator])) {
             $return = $specials[$operator];
+          }
           else {
             // We need to upper case because PHP index matches are case sensitive but
             // do not need the more expensive drupal_strtoupper because SQL statements are ASCII.
             $operator = strtoupper($operator);
             $return = isset($specials[$operator]) ? $specials[$operator] : array();
+          }
           $return += array('operator' => $operator);
           return $return;
+        }
+      }
       /**
        * @} End of "addtogroup database".
        */

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root / drupal7 / includes / database / query.inc @ 01dfd3b5