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<?php
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/**
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* @file
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* A form to change the type of date used in date fields.
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*/
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/**
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* Form constructor for the date type change form.
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*
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* @see date_tools_change_type_form_validate()
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* @see date_tools_change_type_form_submit()
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*/
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function date_tools_change_type_form() {
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$form = array();
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// This is broken, still needs to be adjusted for the D6->D7 changes.
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drupal_set_message(t('This operation does not yet work for the Drupal 7 version.'), 'error');
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return $form;
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$fields = content_fields();
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$date_options = array();
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$type_options = array();
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$labels = array();
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foreach (date_field_info() as $type => $info) {
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$type_options[$type] = $info['label'] . ': ' . $info['description'];
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$labels[$type] = $info['label'];
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}
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// Get the available date fields.
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foreach ($fields as $field_name => $field) {
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if ($field['type'] == 'date' || $field['type'] == 'datestamp' || $field['type'] == 'datetime') {
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$date_options[$labels[$field['type']]][$field_name] = t('Field @label (@field_name)', array('@label' => $field['widget']['label'], '@field_name' => $field_name, '@type' => $labels[$field['type']]));
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}
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}
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if (sizeof($date_options) < 1) {
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drupal_set_message(t('There are no date fields in this database.'));
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return $form;
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}
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$form['date_field'] = array(
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'#type' => 'select',
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'#options' => $date_options,
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'#title' => t('Date field'),
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'#default_value' => '',
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'#description' => t('The date field which whose type should be changed.'),
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);
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$form['type'] = array(
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'#type' => 'radios',
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'#options' => $type_options,
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'#default_value' => '',
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'#required' => TRUE,
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'#description' => t('The type of date to change the field to.'),
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'#prefix' => '<strong>' . t('New type:') . '</strong>',
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);
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$form['submit'] = array('#type' => 'submit', '#value' => t('Change'));
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return $form;
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}
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/**
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* Form validation handler for date_tools_change_type_form().
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*
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* @see date_tools_change_type_form_submit()
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*/
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function date_tools_change_type_form_validate($form, &$form_state) {
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$field_name = $form_state['values']['date_field'];
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$new_type = $form_state['values']['type'];
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$field = content_fields($field_name);
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$old_type = $field['type'];
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if ($new_type == $old_type) {
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form_set_error('type', t('The current type is the same as the chosen type. There is nothing to change.'));
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}
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}
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/**
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* Form submission handler for date_tools_change_type_form().
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*
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* @see date_tools_change_type_form_validate()
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*/
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function date_tools_change_type_form_submit($form, &$form_state) {
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$field_name = $form_state['values']['date_field'];
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$new_type = $form_state['values']['type'];
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$field = content_fields($field_name);
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$old_type = $field['type'];
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if ($new_type == $old_type) {
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return;
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}
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$db_info = content_database_info($field);
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$table = $db_info['table'];
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$columns = $db_info['columns'];
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$labels = array();
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foreach (date_field_info() as $type => $info) {
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$labels[$type] = $info['label'];
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}
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// Is there any data in this field? If not, we can
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// skip some steps.
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$has_data = db_query("SELECT COUNT(*) FROM {" . $table . "}")->fetchField();
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// Create a backup copy of the original values.
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// The values are going to get corrupted when we
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// change the column type.
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if ($has_data) {
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$temp_table = $table . '_temp';
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db_query("CREATE TABLE {" . $temp_table . "} SELECT * FROM {" . $table . "}");
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}
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// Change the field definition to the new type.
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$field['type'] = $new_type;
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require_once './' . drupal_get_path('module', 'content') . '/includes/content.crud.inc';
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content_field_instance_update($field, FALSE);
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content_clear_type_cache();
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// If there's no data to update, we're finished.
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if (!$has_data) {
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drupal_set_message(t('The field @field_name has been changed from @old_type to @new_type.', array(
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'@field_name' => $field['widget']['label'], '@old_type' => $labels[$old_type], '@new_type' => $labels[$new_type])));
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return;
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}
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// Replace old values with modified values, massaging the original values as
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// necessary for the new type.
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require_once './' . drupal_get_path('module', 'date_api') . '/date_api_sql.inc';
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$date_handler = new date_sql_handler();
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$date_handler->granularity = $field['granularity'];
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$date_handler->date_type = $old_type;
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$new_columns = array();
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$old_columns = array('nid', 'vid');
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$new_columns[] = $temp_table . '.nid AS nid';
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$new_columns[] = $temp_table . '.vid AS vid';
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if ($field->multiple) {
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$new_columns[] = $temp_table . '.delta AS delta';
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$old_columns[] = 'delta';
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}
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foreach ($columns as $column => $info) {
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if ($column != 'value' && $column != 'value2') {
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continue;
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}
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$old_columns[] = $info['column'];
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$db_field = $date_handler->sql_field($temp_table . '.' . $info['column'], 0);
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switch ($old_type) {
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case 'date':
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switch ($new_type) {
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case 'datestamp':
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$new_columns[] = $date_handler->sql_format('U', $db_field) . ' AS ' . $info['column'];
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break;
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case 'datetime':
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$new_columns[] = $date_handler->sql_format('Y-m-d H:i:s', $db_field) . ' AS ' . $info['column'];
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break;
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}
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break;
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case 'datestamp':
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switch ($new_type) {
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case 'date':
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$new_columns[] = $date_handler->sql_format('Y-m-d/TH:i:s', $db_field) . ' AS ' . $info['column'];
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break;
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case 'datetime':
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$new_columns[] = $date_handler->sql_format('Y-m-d H:i:s', $db_field) . ' AS ' . $info['column'];
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break;
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}
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break;
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case 'datetime':
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switch ($new_type) {
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case 'date':
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$new_columns[] = $date_handler->sql_format('Y-m-d/TH:i:s', $db_field) . ' AS ' . $info['column'];
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break;
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case 'datestamp':
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$new_columns[] = $date_handler->sql_format('U', $db_field) . ' AS ' . $info['column'];
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break;
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}
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break;
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}
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}
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// Make sure database timezone is set to UTC.
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$date_handler->set_db_timezone();
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// Make the replacement.
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$sql = 'REPLACE INTO {' . $table . '} (' . implode(', ', $old_columns) . ') ' . ' SELECT ' . implode(', ', $new_columns) . ' FROM {' . $temp_table . '}';
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db_query($sql);
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db_query("DROP TABLE {" . $temp_table . "}");
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drupal_set_message(t('The field @field_name has been changed from @old_type to @new_type.', array('@field_name' => $field['widget']['label'], '@old_type' => $labels[$old_type], '@new_type' => $labels[$new_type])));
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}
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