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Drupal example source code file (content.install)

This example Drupal source code file (content.install) is included in the DevDaily.com "Drupal Source Code Warehouse" project. The intent of this project is to help you "Learn Drupal by Example".

PHP - Drupal tags/keywords

abort, array, database, foreach, function, if, module, not, null, php, ret, return, sql, true

The content.install Drupal example source code

<?php
// $Id: content.install,v 1.85.2.33 2009/07/14 22:17:05 yched Exp $

function content_requirements($phase) {
  $requirements = array();
  // Ensure translations don't break at install time
  $t = get_t();
  if (module_exists('views') && (!function_exists('views_api_version') || views_api_version() < 2.0)) {
    $requirements['cck_views'] = array(
      'title' => $t('CCK - No Views integration'),
      'description' => $t("CCK integration with Views module requires Views 6.x-2.0-rc2 or greater."),
      'severity' => REQUIREMENT_ERROR,
    );
  }
  return $requirements;
}

/**
 * 'Safe' version of content_types() to use in updates and installs.
 *
 * Can't safely use content_fields() or content_types() in an update to get
 * a fields array, especially without knowing what field modules are enabled,
 * or the current state of the database and cache, so create a fields array
 * from database info that is limited to fields from modules that are
 * currently enabled.
 */
function content_types_install() {
  drupal_load('module', 'content');
  module_load_include('inc', 'content', '/includes/content.crud');
  $module_field_types = $module_widgets = array();
  foreach (module_list() as $module) {
    if ($field_type = module_invoke($module, 'field_info')) {
      $module_field_types[$module] = $field_type;
    }
    if ($widget_type = module_invoke($module, 'widget_info')) {
      $module_widgets[$module] = $widget_type;
    }
  }
  $fields = array();
  $db_result = db_query("SELECT * FROM {". content_instance_tablename() ."} nfi ".
    " LEFT JOIN {". content_field_tablename() ."} nf ON nf.field_name = nfi.field_name");
  while ($row = db_fetch_array($db_result)) {
    $field = array_merge($row, unserialize($row['global_settings']));
    unset($field['global_settings']);

    // There may be module data available for currently disabled modules,
    // or missing module data for currently enabled modules, so start over
    // to get only field info for enabled modules.
    unset($field['module']);
    unset($field['widget_module']);
    // 'columns' is a reserved word in MySQL4, so our column is named 'db_columns'.
    $field['columns'] = isset($field['db_columns']) ? $field['db_columns'] : array();
    unset($field['db_columns']);

    foreach ($module_field_types as $module => $types) {
      foreach ($types as $type_name => $type) {
        if ($field['type'] == $type_name) {
          $field['module'] = $module;
        }
      }
    }
    foreach ($module_widgets as $module => $types) {
      foreach ($types as $type_name => $type) {
        if ($field['widget_type'] == $type_name) {
          $field['widget_module'] = $module;
        }
      }
    }
    if (!empty($field['module']) && !empty($field['widget_module'])) {
      $field['widget_settings'] = unserialize($field['widget_settings']);
      $field['display_settings'] = unserialize($field['display_settings']);
      $field['columns'] = (array) module_invoke($field['module'], 'field_settings', 'database columns', $field);
      $field = content_field_instance_expand($field);
      $fields[$field['type_name']][$field['field_name']] = $field;
    }
  }
  return $fields;
}

/**
 * Implementation of hook_install().
 */
function content_install() {
  variable_set('content_schema_version', 6009);
  drupal_install_schema('content');
}


/**
 * Implementation of hook_uninstall().
 */
function content_uninstall() {
  drupal_uninstall_schema('content');
  // The variable is used during the uninstall process,
  // so we removed it at the very end.
  variable_del('content_schema_version');
  // Remove extra weights.
  foreach (node_get_types('names') as $type_name) {
    variable_del("content_extra_weights_$type_name");
  }
}

/**
 * Implementation of hook_enable().
 */
function content_enable() {
  // Make sure old data is emptied out of the caches, since it
  // may no longer be valid since the module was last enabled,
  // especially if not all the same field modules are enabled
  // as before. Especially needed during updates.
  cache_clear_all('*', 'cache_content', TRUE);
  content_clear_type_cache(TRUE);
}

/**
 * Implementation of hook_disable().
 */
function content_disable() {
  // Make sure old data is emptied out of the caches, since it
  // may no longer be valid when the module is re-enabled.
  cache_clear_all('*', 'cache_content', TRUE);
  content_clear_type_cache(TRUE);
}

/**
 * Implementation of hook_schema.
 */
function content_schema() {

  // Static (meta) tables.

  $schema['content_node_field'] = array(
    'fields' => array(
      'field_name'      => array('type' => 'varchar', 'length' => 32, 'not null' => TRUE, 'default' => ''),
      'type'            => array('type' => 'varchar', 'length' => 127, 'not null' => TRUE, 'default' => ''),
      'global_settings' => array('type' => 'text', 'size' => 'medium', 'not null' => TRUE, 'serialize' => TRUE),
      'required'        => array('type' => 'int', 'size' => 'tiny', 'not null' => TRUE, 'default' => 0),
      'multiple'        => array('type' => 'int', 'size' => 'tiny', 'not null' => TRUE, 'default' => 0),
      'db_storage'      => array('type' => 'int', 'size' => 'tiny', 'not null' => TRUE, 'default' => 1),
      'module'          => array('type' => 'varchar', 'length' => 127, 'not null' => TRUE, 'default' => ''),
      'db_columns'      => array('type' => 'text', 'size' => 'medium', 'not null' => TRUE, 'serialize' => TRUE),
      'active'          => array('type' => 'int', 'size' => 'tiny', 'not null' => TRUE, 'default' => 0),
      'locked'          => array('type' => 'int', 'size' => 'tiny', 'not null' => TRUE, 'default' => 0),
    ),
    'primary key' => array('field_name'),
  );
  $schema['content_node_field_instance'] = array(
    'fields' => array(
      'field_name'       => array('type' => 'varchar', 'length' => 32, 'not null' => TRUE, 'default' => ''),
      'type_name'        => array('type' => 'varchar', 'length' => 32, 'not null' => TRUE, 'default' => ''),
      'weight'           => array('type' => 'int', 'not null' => TRUE, 'default' => 0),
      'label'            => array('type' => 'varchar', 'length' => 255, 'not null' => TRUE, 'default' => ''),
      'widget_type'      => array('type' => 'varchar', 'length' => 32, 'not null' => TRUE, 'default' => ''),
      'widget_settings'  => array('type' => 'text', 'size' => 'medium', 'not null' => TRUE, 'serialize' => TRUE),
      'display_settings' => array('type' => 'text', 'size' => 'medium', 'not null' => TRUE, 'serialize' => TRUE),
      'description'      => array('type' => 'text', 'size' => 'medium', 'not null' => TRUE),
      'widget_module'    => array('type' => 'varchar', 'length' => 127, 'not null' => TRUE, 'default' => ''),
      'widget_active'    => array('type' => 'int', 'size' => 'tiny', 'not null' => TRUE, 'default' => 0),
    ),
    'primary key' => array('field_name', 'type_name'),
  );
  $schema['cache_content'] = drupal_get_schema_unprocessed('system', 'cache');

  // When the module is first installed, the remaining code in the schema
  // will create errors, since these tables have not yet been created.
  // We don't need to create data tables on initial installation anyway
  // since no fields have been created yet, so just return with this much
  // of the schema.

  if (!db_table_exists('content_node_field') || !db_table_exists('content_node_field_instance')) {
    return $schema;
  }

  // Dynamic (data) tables.

  drupal_load('module', 'content');

  // We can't use many helper functions here, like content_fields() or
  // content_types() or we risk creating a fatal loop from circular
  // logic when they call other functions that use this schema, so create
  // the schema directly from a fresh query of the database.

  // content_table_schema() and content_database_info() have no
  // circular logic and are safe to use here.

  $db_result = db_query("SELECT * FROM {". content_instance_tablename() ."} nfi ".
    " LEFT JOIN {". content_field_tablename() ."} nf ON nf.field_name = nfi.field_name WHERE nf.active = 1 AND nfi.widget_active = 1");
  while ($field = db_fetch_array($db_result)) {
    // 'columns' is a reserved word in MySQL4, so our db column is named 'db_columns'.
    $field['columns'] = unserialize($field['db_columns']);
    unset($field['db_columns']);

    $content_table = _content_tablename($field['type_name'], CONTENT_DB_STORAGE_PER_CONTENT_TYPE);
    $field_table = _content_tablename($field['field_name'], CONTENT_DB_STORAGE_PER_FIELD);


    // We always add a 'per content type' table for each content type that
    // has fields.
    if (!isset($schema[$content_table])) {
      $schema[$content_table] = content_table_schema();
    }

    $base_schema = content_table_schema($field);
    if ($field['db_storage'] == CONTENT_DB_STORAGE_PER_FIELD) {
      // Per-field storage: add the 'per field' table if needed.
      if (!isset($schema[$field_table])) {
        $schema[$field_table] = $base_schema;
      }
    }
    else {
      // Per-type storage: merge the information for the field
      // in the existing table.
      $schema[$content_table]['fields'] = array_merge($schema[$content_table]['fields'], $base_schema['fields']);
      $schema[$content_table]['content fields'] = array_merge($schema[$content_table]['content fields'], $base_schema['content fields']);
    }
  }
  return $schema;
}

function content_update_last_removed() {
  return 1008;
}

/**
 * Helper function for module updates :
 * - checks no updates are pending for content.module
 * - checks content module and the module being updated are both enabled.
 *
 * @param $module
 *   The name of the module being updated.
 */
function content_check_update($module = NULL) {
  $ret = array();
  // Check that modules are enabled before running their updates.
  if (!module_exists('content') || ($module && !module_exists($module))) {
    drupal_set_message(t("Updates for CCK-related modules are not run until the modules are enabled on the <a href=\"@admin-modules-path\">administer modules page</a>. When you enable them, you'll need to return to <a href=\"@update-php\">update.php</a> and run the remaining updates.", array('@admin-modules-path' => url('admin/build/modules'), '@update-php' => base_path() .'update.php?op=selection')), 'warning', FALSE);
    // The content module is not enabled, nothing else can happen.
    if ($module && !module_exists('content') && module_exists($module)) {
      $query_message = t('!module.module has updates but cannot be updated because content.module is not enabled.<br />If and when content.module is enabled, you will need to re-run the update script. You will continue to see this message until the module is enabled and updates are run.', array('!module' => $module));
    }
    // The requested module is not enabled, which may be intentional.
    // Just let the user know there are updates to be processed if enabled later.
    else {
      $query_message = t('!module.module has updates and is available in the modules folder but is not enabled.<br />If and when it is enabled, you will need to re-run the update script. You will continue to see this message until the module is enabled and updates are run.', array('!module' => $module ? $module : 'content'));
    }
    $ret['#abort'] = array('success' => FALSE, 'query' => $query_message);
    return $ret;
  }
  // Check that content.module is up-to-date before running field module updates.
  if ($module && (drupal_get_installed_schema_version('content', TRUE) < max(drupal_get_schema_versions('content')))) {
    drupal_set_message(t('Some updates are still pending. Please return to <a href="@update-php">update.php</a> and run the remaining updates.', array('@update-php' => base_path() .'update.php?op=selection')), 'warning', FALSE);
    $ret['#abort'] = array('success' => FALSE, 'query' => t('Some updates are still pending.<br/>Please re-run the update script.'));
    return $ret;
  }
  // If everything is OK and updates are not aborted, make sure
  // content_associate_fields() gets run. With all the complexity of
  // the dependent updates, it can get missed when an update is aborted.
  // It won't hurt anything to do this more than once in order to be sure
  // it doesn't get skipped. Without this step, we can end up with
  // field modules that are enabled and updated, but not marked as active
  // in the content_node_field table.
  if ($module and module_exists($module)) {
    content_associate_fields($module);
  }
}

/**
 * Add module name to fields table to make it easier to identify the fields to delete when a module
 * is uninstalled.
 *
 * Needed because the value drops out of content_info() when module is disabled, so there
 * is no other way to find the associated fields.
 */
function content_update_6000() {
  if ($abort = content_check_update()) {
    return $abort;
  }

  $ret = array();

  drupal_load('module', 'content');
  if (db_column_exists(content_field_tablename(), 'active')) {
    return $ret;
  }
  db_add_field($ret, content_field_tablename(), 'module', array('type' => 'varchar', 'length' => 127, 'not null' => TRUE, 'default' => ''));
  db_add_field($ret, content_field_tablename(), 'db_columns', array('type' => 'text', 'size' => 'medium', 'not null' => TRUE, 'initial' => ''));
  db_add_field($ret, content_field_tablename(), 'active', array('type' => 'int', 'size' => 'tiny', 'not null' => TRUE, 'default' => 0));
  db_add_field($ret, content_instance_tablename(), 'widget_module', array('type' => 'varchar', 'length' => 127, 'not null' => TRUE, 'default' => ''));
  db_add_field($ret, content_instance_tablename(), 'widget_active', array('type' => 'int', 'size' => 'tiny', 'not null' => TRUE, 'default' => 0));

  // This will update the table for any modules enabled at this time.
  foreach (module_list() as $module) {
    content_associate_fields($module);
  }

  // Fix the cache_content schema
  if (db_table_exists('cache_content')) {
    db_drop_table($ret, 'cache_content');
  }
  db_create_table($ret, 'cache_content', drupal_get_schema_unprocessed('system', 'cache'));
  variable_set('content_schema_version', 6000);

  // The cache table had to be used to store data until this update ran,
  // so clear cache out now that we're switching back to the cache_content table.
  $ret[] = update_sql('DELETE FROM {cache}');

  return $ret;
}

/**
 * Rename node_field and node_field_instance tables.
 *
 * This is a carryover from when the data tables were renamed,
 * postponed so we wouldn't create any more havoc than necessary
 * until a major version change.
 *
 * Using 'content_node_field' instead of 'content_field'
 * to avoid conflicts with field tables that will be prefixed
 * with 'content_field'.
 */
function content_update_6001() {
  if ($abort = content_check_update()) {
    return $abort;
  }

  $ret = array();
  drupal_load('module', 'content');
  if (db_table_exists('content_node_field')) {
    return $ret;
  }
  db_rename_table($ret, 'node_field', 'content_node_field');
  db_rename_table($ret, 'node_field_instance', 'content_node_field_instance');
  variable_set('content_schema_version', 6001);
  content_clear_type_cache(TRUE);
  return $ret;
}

/**
 * Get rid of automatic per content tables for content types that have no fields.
 * Switching to adding those tables only when needed.
 */
function content_update_6002() {
  if ($abort = content_check_update()) {
    return $abort;
  }

  $ret = array();

  drupal_load('module', 'content');
  $db_types = content_types_install();
  $field_types = array();

  $result = db_query("SELECT DISTINCT type_name FROM {". content_instance_tablename() ."}");
  while ($type = db_fetch_array($result)) {
    $field_types[] = $type['type_name'];
  }

  foreach ($db_types as $content_type => $content_info) {
    if (!in_array($content_type, $field_types)) {
      $table = _content_tablename($content_type, CONTENT_DB_STORAGE_PER_CONTENT_TYPE);
      if (db_table_exists($table)) {
        db_drop_table($ret, $table);
      }
    }
  }
  variable_set('content_schema_version', 6002);
  content_clear_type_cache(TRUE);
  return $ret;
}

/**
 * 'db_columns' column 1st got introduced as 'columns', which is forbidden in MySQL 4.
 * This update function will only be useful for early D6 testers...
 */
function content_update_6003() {
  if ($abort = content_check_update()) {
    return $abort;
  }

  $ret = array();
  if (db_column_exists('content_node_field', 'columns')) {
    db_change_field($ret, 'content_node_field', 'columns', 'db_columns', array('type' => 'text', 'size' => 'medium', 'not null' => TRUE));
  }
  variable_set('content_schema_version', 6003);
  return $ret;
}

/**
 * Index the 'nid' column on data tables to optimize node deletion.
 * Large tables might deserve a multipass update.
 */
function content_update_6004(&$sandbox) {
  if ($abort = content_check_update()) {
    return $abort;
  }

  $ret = array();

  // Do nothing if the indexes were already created by D5's content_update_1009.
  if (variable_get('content_update_1009', FALSE)) {
    return $ret;
  }

  // Gather list of tables.
  if (!isset($sandbox['tables'])) {
    drupal_load('module', 'content');
    $sandbox['tables'] = array();
    $result = db_query('SELECT * FROM {'. content_instance_tablename() .'} nfi '.
      ' LEFT JOIN {'. content_field_tablename() .'} nf ON nf.field_name = nfi.field_name');
    while ($field = db_fetch_array($result)) {
      if ($field['db_storage'] == CONTENT_DB_STORAGE_PER_FIELD) {
        $table = _content_tablename($field['field_name'], CONTENT_DB_STORAGE_PER_FIELD);
      }
      else {
        $table = _content_tablename($field['type_name'], CONTENT_DB_STORAGE_PER_CONTENT_TYPE);
      }
      $sandbox['tables'][$table] = $table;
    }
    $sandbox['count'] = count($sandbox['tables']);
  }

  // One pass : add index on one table.
  if ($table = array_shift($sandbox['tables'])) {
    db_add_index($ret, $table, 'nid', array('nid'));
  }

  if ($sandbox['count']) {
    $ret['#finished'] = 1 - count($sandbox['tables']) / $sandbox['count'];
  }
  variable_set('content_schema_version', 6004);
  return $ret;
}

/**
 * Add 'locked' property for fields.
 */
function content_update_6005() {
  if ($abort = content_check_update()) {
    return $abort;
  }

  $ret = array();
  drupal_load('module', 'content');
  db_add_field($ret, content_field_tablename(), 'locked', array('type' => 'int', 'size' => 'tiny', 'not null' => TRUE, 'default' => 0));
  variable_set('content_schema_version', 6005);
  return $ret;
}

/**
 * Make sure the 'locked' column is NOT NULL (error in previous content_update_6005().
 */
function content_update_6006() {
  if ($abort = content_check_update()) {
    return $abort;
  }

  $ret = array();
  drupal_load('module', 'content');
  db_change_field($ret, content_field_tablename(), 'locked', 'locked', array('type' => 'int', 'size' => 'tiny', 'not null' => TRUE, 'default' => 0));
  variable_set('content_schema_version', 6006);
  return $ret;
}

/**
 * Dummy update function to make sure the theme registry and css / JS aggregated files
 * are updated.
 */
function content_update_6007() {
  if ($abort = content_check_update()) {
    return $abort;
  }

  variable_set('content_schema_version', 6007);
  return array();
}

/**
 * Dummy update function to make sure schema version gets updated.
 */
function content_update_6008() {
  if ($abort = content_check_update()) {
    return $abort;
  }

  variable_set('content_schema_version', 6008);
  return array();
}

/**
 * Add the 'exclude from $content' display setting to all existing field instances.
 */
function content_update_6009() {
  if ($abort = content_check_update()) {
    return $abort;
  }

  $ret = array();
  $result = db_query("SELECT *  FROM {content_node_field_instance}");
  while ($type = db_fetch_array($result)) {
    $new_settings = array();
    $display_settings = unserialize($type['display_settings']);
    if (!empty($display_settings)) {
      foreach ($display_settings as $key => $val) {
        $new_settings[$key] = $val;
        if ($key !== 'label' && is_array($val)) {
          $new_settings[$key]['exclude'] = 0;
        }
      }
    }
    else {
      $new_settings = array(
        'label' => array('format' => 'above'),
        'full' => array('format' => 'default', 'exclude' => 0),
        'teaser' => array('format' => 'default', 'exclude' => 0),
        );
    }
    db_query("UPDATE {content_node_field_instance} SET display_settings='%s' WHERE field_name='%s' AND type_name='%s'", serialize($new_settings), $type['field_name'], $type['type_name']);
  }
  variable_set('content_schema_version', 6009);
  return $ret;
}

/**
 * Fix multiple serialization caused by per-field to per-type migration.
 * See http://drupal.org/node/407446.
 */
function content_update_6010(&$sandbox) {
  if ($abort = content_check_update()) {
    return $abort;
  }
  $ret = array();

  drupal_load('module', 'content');

  // Gather list of tables and columns that need to be updated.
  if (!isset($sandbox['tables'])) {
    $sandbox['tables'] = array();
    $fields = content_fields();
    foreach ($fields as $name => $field) {
      $db_info = content_database_info($field);
      foreach ($db_info['columns'] as $column => $attributes) {
        if (isset($attributes['serialize']) && $attributes['serialize']) {
          $sandbox['tables'][$db_info['table']]['table'] = $db_info['table'];
          $sandbox['tables'][$db_info['table']]['columns'][] = $attributes['column'];
          $sandbox['tables'][$db_info['table']]['multiple'] = $field['multiple'];
        }
      }
    }
    $sandbox['count'] = count($sandbox['tables']);
    $sandbox['current_vid'] = 0;
    $sandbox['current_delta'] = 0;
  }

  // Number of rows to fix in one pass.
  $limit = 500;
  // Start correcting data.
  if ($table_info = array_shift($sandbox['tables'])) {
    $table = $table_info['table'];
    $columns = $table_info['columns'];

    if ($table_info['multiple']) {
      $query = "SELECT * FROM {" . $table . "} WHERE (vid = %d AND delta > %d) OR (vid > %d) ORDER BY vid ASC, delta ASC";
      $args = array($sandbox['current_vid'], $sandbox['current_delta'], $sandbox['current_vid']);
    }
    else {
      $query = "SELECT * FROM {" . $table . "} WHERE vid > %d ORDER BY vid ASC";
      $args = array($sandbox['current_vid']);
    }
    $result = db_query_range($query, $args, 0, $limit);
    $count = 0;
    while ($row = db_fetch_array($result)) {
      $update_query = $update_args = array();
      foreach ($columns as $column) {
        $data = $row[$column];
        // No need to do anything if the data is NULL.
        if (!empty($data)) {
          // Unserialize until we get something that is not a string
          while (is_string($data)) {
            $unserialized = @unserialize($data);
            if ($unserialized !== FALSE) {
              $data = $unserialized;
            }
            else {
              // TODO : test with a serialized string, just in case...
              break;
            }
          }
          // Re-serialize once.
          $data = serialize($data);
          // If we end up with something different than what we started with, update.
          if ($data !== $row[$column]) {
            $update_query[] = "$column = '%s'";
            $update_args[] = $data;
          }
        }
      }
      if ($update_query) {
        $update_args[] = $row['vid'];
        db_query("UPDATE {" . $table . "} SET ". implode(', ', $update_query) ." WHERE vid = %d", $update_args);
      }
      $sandbox['current_vid'] = $row['vid'];
      $sandbox['current_delta'] = isset($row['delta']) ? $row['delta'] : 0;
      $count++;
    }
    if ($count == $limit) {
      // Add the table back into the list of tables to be processed if rows remain.
      array_unshift($sandbox['tables'], $table_info);
    }
    else {
      // Done with this table: reset vid and delta markers.
      $sandbox['current_vid'] = 0;
      $sandbox['current_delta'] = 0;
      $ret[] = array('success' => TRUE, 'query' => "Fixed serialized values in table $table");
    }
  }

  if ($sandbox['count']) {
    $ret['#finished'] = 1 - count($sandbox['tables']) / $sandbox['count'];
  }
  return $ret;
}

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