class MigrateSQLMap in Migrate 6.2

Same name and namespace in other branches

7.2 plugins/sources/sqlmap.inc \MigrateSQLMap

@file Defines a Drupal db-based implementation of MigrateMap.

Hierarchy

class \MigrateMap implements \Iterator
- class \MigrateSQLMap

Expanded class hierarchy of MigrateSQLMap

File

plugins/sources/sqlmap.inc, line 8: Defines a Drupal db-based implementation of MigrateMap.

View source

class MigrateSQLMap extends MigrateMap {

  /**
   * Names of tables created for tracking the migration.
   *
   * @var string
   */
  protected $mapTable, $messageTable;
  public function getMapTable() {
    return $this->mapTable;
  }
  public function getMessageTable() {
    return $this->messageTable;
  }

  /**
   * Qualifying the map table name with the database name makes cross-db joins
   * possible. Note that, because prefixes are applied after we do this (i.e.,
   * it will prefix the string we return), we do not qualify the table if it has
   * a prefix. This will work fine when the source data is in the default
   * (prefixed) database (in particular, for simpletest), but not if the primary
   * query is in an external database.
   *
   * @return string
   */
  public function getQualifiedMapTable() {
    $options = $this->connection
      ->getConnectionOptions();
    $prefix = $this->connection
      ->tablePrefix($this->mapTable);
    if ($prefix) {
      return $this->mapTable;
    }
    else {
      return $options['database'] . '.' . $this->mapTable;
    }
  }

  /**
   * sourceKey and destinationKey arrays are keyed by the field names; values
   * are the Drupal schema definition for the field.
   *
   * @var array
   */
  public function getSourceKey() {
    return $this->sourceKey;
  }
  public function getDestinationKey() {
    return $this->destinationKey;
  }

  /**
   * Drupal connection object on which to create the map/message tables
   * @var DatabaseConnection
   */
  protected $connection;
  public function getConnection() {
    return $this->connection;
  }

  /**
   * We don't need to check the tables more than once per request.
   *
   * @var boolean
   */
  protected $ensured;
  public function __construct($machine_name, array $source_key, array $destination_key, $connection_key = 'default', $options = array()) {
    if (isset($options['track_last_imported'])) {
      $this->trackLastImported = TRUE;
    }

    // Default generated table names, limited to 63 characters
    $this->mapTable = 'migrate_map_' . drupal_strtolower($machine_name);
    $this->mapTable = substr($this->mapTable, 0, 63);
    $this->messageTable = 'migrate_message_' . drupal_strtolower($machine_name);
    $this->messageTable = substr($this->messageTable, 0, 63);
    $this->sourceKey = $source_key;
    $this->destinationKey = $destination_key;
    $this->connection = Database::getConnection('default', $connection_key);

    // Build the source and destination key maps
    $this->sourceKeyMap = array();
    $count = 1;
    foreach ($source_key as $field => $schema) {
      $this->sourceKeyMap[$field] = 'sourceid' . $count++;
    }
    $this->destinationKeyMap = array();
    $count = 1;
    foreach ($destination_key as $field => $schema) {
      $this->destinationKeyMap[$field] = 'destid' . $count++;
    }
    $this
      ->ensureTables();
  }

  /**
   * Create the map and message tables if they don't already exist.
   */
  protected function ensureTables() {
    if (!$this->ensured) {
      if (!$this->connection
        ->schema()
        ->tableExists($this->mapTable)) {

        // Generate appropriate schema info for the map and message tables,
        // and map from the source field names to the map/msg field names
        $count = 1;
        $source_key_schema = array();
        $pks = array();
        foreach ($this->sourceKey as $field_schema) {
          $mapkey = 'sourceid' . $count++;
          $source_key_schema[$mapkey] = $field_schema;
          $pks[] = $mapkey;
        }
        $fields = $source_key_schema;

        // Add destination keys to map table
        // TODO: How do we discover the destination schema?
        $count = 1;
        foreach ($this->destinationKey as $field_schema) {

          // Allow dest key fields to be NULL (for IGNORED/FAILED cases)
          $field_schema['not null'] = FALSE;
          $mapkey = 'destid' . $count++;
          $fields[$mapkey] = $field_schema;
        }
        $fields['needs_update'] = array(
          'type' => 'int',
          'size' => 'tiny',
          'unsigned' => TRUE,
          'not null' => TRUE,
          'default' => MigrateMap::STATUS_IMPORTED,
          'description' => 'Indicates current status of the source row',
        );
        $fields['rollback_action'] = array(
          'type' => 'int',
          'size' => 'tiny',
          'unsigned' => TRUE,
          'not null' => TRUE,
          'default' => MigrateMap::ROLLBACK_DELETE,
          'description' => 'Flag indicating what to do for this item on rollback',
        );
        $fields['last_imported'] = array(
          'type' => 'int',
          'unsigned' => TRUE,
          'not null' => TRUE,
          'default' => 0,
          'description' => 'UNIX timestamp of the last time this row was imported',
        );
        $schema = array(
          'description' => t('Mappings from source key to destination key'),
          'fields' => $fields,
          'primary key' => $pks,
        );
        $this->connection
          ->schema()
          ->createTable($this->mapTable, $schema);

        // Now for the message table
        $fields = array();
        $fields['msgid'] = array(
          'type' => 'serial',
          'unsigned' => TRUE,
          'not null' => TRUE,
        );
        $fields += $source_key_schema;
        $fields['level'] = array(
          'type' => 'int',
          'unsigned' => TRUE,
          'not null' => TRUE,
          'default' => 1,
        );
        $fields['message'] = array(
          'type' => 'text',
          'size' => 'medium',
          'not null' => TRUE,
        );
        $schema = array(
          'description' => t('Messages generated during a migration process'),
          'fields' => $fields,
          'primary key' => array(
            'msgid',
          ),
          'indexes' => array(
            'sourcekey' => $pks,
          ),
        );
        $this->connection
          ->schema()
          ->createTable($this->messageTable, $schema);
      }
      $this->ensured = TRUE;
    }
  }

  /**
   * Retrieve a row from the map table, given a source ID
   *
   * @param array $source_id
   */
  public function getRowBySource(array $source_id) {
    migrate_instrument_start('mapRowBySource');
    $query = $this->connection
      ->select($this->mapTable, 'map')
      ->fields('map');
    foreach ($this->sourceKeyMap as $key_name) {
      $query = $query
        ->condition("map.{$key_name}", array_shift($source_id), '=');
    }
    $result = $query
      ->execute();
    migrate_instrument_stop('mapRowBySource');
    return $result
      ->fetchAssoc();
  }

  /**
   * Retrieve a row from the map table, given a destination ID
   *
   * @param array $source_id
   */
  public function getRowByDestination(array $destination_id) {
    migrate_instrument_start('getRowByDestination');
    $query = $this->connection
      ->select($this->mapTable, 'map')
      ->fields('map');
    foreach ($this->destinationKeyMap as $key_name) {
      $query = $query
        ->condition("map.{$key_name}", array_shift($destination_id), '=');
    }
    $result = $query
      ->execute();
    migrate_instrument_stop('getRowByDestination');
    return $result
      ->fetchAssoc();
  }

  /**
   * Retrieve an array of map rows marked as needing update.
   *
   * @param int $count
   *  Maximum rows to return; defaults to 10,000
   * @return array
   *  Array of map row objects with needs_update==1.
   */
  public function getRowsNeedingUpdate($count) {
    $rows = array();
    $result = $this->connection
      ->select($this->mapTable, 'map')
      ->fields('map')
      ->condition('needs_update', MigrateMap::STATUS_NEEDS_UPDATE)
      ->range(0, $count)
      ->execute();
    foreach ($result as $row) {
      $rows[] = $row;
    }
    return $rows;
  }

  /**
   * Given a (possibly multi-field) destination key, return the (possibly multi-field)
   * source key mapped to it.
   *
   * @param array $destination_id
   *  Array of destination key values.
   * @return array
   *  Array of source key values, or NULL on failure.
   */
  public function lookupSourceID(array $destination_id) {
    migrate_instrument_start('lookupSourceID');
    $query = $this->connection
      ->select($this->mapTable, 'map')
      ->fields('map', $this->sourceKeyMap);
    foreach ($this->destinationKeyMap as $key_name) {
      $query = $query
        ->condition("map.{$key_name}", array_shift($destination_id), '=');
    }
    $result = $query
      ->execute();
    $source_id = $result
      ->fetchAssoc();
    migrate_instrument_stop('lookupSourceID');
    return $source_id;
  }

  /**
   * Given a (possibly multi-field) source key, return the (possibly multi-field)
   * destination key it is mapped to.
   *
   * @param array $source_id
   *  Array of source key values.
   * @return array
   *  Array of destination key values, or NULL on failure.
   */
  public function lookupDestinationID(array $source_id) {
    migrate_instrument_start('lookupDestinationID');
    $query = $this->connection
      ->select($this->mapTable, 'map')
      ->fields('map', $this->destinationKeyMap);
    foreach ($this->sourceKeyMap as $key_name) {
      $query = $query
        ->condition("map.{$key_name}", array_shift($source_id), '=');
    }
    $result = $query
      ->execute();
    $destination_id = $result
      ->fetchAssoc();
    migrate_instrument_stop('lookupDestinationID');
    return $destination_id;
  }

  /**
   * Called upon import of one record, we record a mapping from the source key
   * to the destination key. Also may be called, setting the third parameter to
   * NEEDS_UPDATE, to signal an existing record should be remigrated.
   *
   * @param stdClass $source_row
   *  The raw source data. We use the key map derived from the source object
   *  to get the source key values.
   * @param array $dest_ids
   *  The destination key values.
   * @param int $needs_update
   *  Status of the source row in the map. Defaults to STATUS_IMPORTED.
   * @param int $rollback_action
   *  How to handle the destination object on rollback. Defaults to
   *  ROLLBACK_DELETE.
   */
  public function saveIDMapping(stdClass $source_row, array $dest_ids, $needs_update = MigrateMap::STATUS_IMPORTED, $rollback_action = MigrateMap::ROLLBACK_DELETE) {
    migrate_instrument_start('saveIDMapping');

    // Construct the source key
    $keys = array();
    foreach ($this->sourceKeyMap as $field_name => $key_name) {

      // A NULL key value will fail.
      if (is_null($source_row->{$field_name})) {
        Migration::displayMessage(t('Could not save to map table due to NULL value for key field !field', array(
          '!field' => $field_name,
        )));
        migrate_instrument_stop('saveIDMapping');
        return;
      }
      $keys[$key_name] = $source_row->{$field_name};
    }
    $fields = array(
      'needs_update' => (int) $needs_update,
      'rollback_action' => (int) $rollback_action,
    );
    $count = 1;
    if (!empty($dest_ids)) {
      foreach ($dest_ids as $dest_id) {
        $fields['destid' . $count++] = $dest_id;
      }
    }
    if ($this->trackLastImported) {
      $fields['last_imported'] = time();
    }
    $this->connection
      ->merge($this->mapTable)
      ->key($keys)
      ->fields($fields)
      ->execute();
    migrate_instrument_stop('saveIDMapping');
  }

  /**
   * Record a message in the migration's message table.
   *
   * @param array $source_key
   *  Source ID of the record in error
   * @param string $message
   *  The message to record.
   * @param int $level
   *  Optional message severity (defaults to MESSAGE_ERROR).
   */
  public function saveMessage($source_key, $message, $level = Migration::MESSAGE_ERROR) {

    // Source IDs as arguments
    $count = 1;
    if (is_array($source_key)) {
      foreach ($source_key as $key_value) {
        $fields['sourceid' . $count++] = $key_value;

        // If any key value is empty, we can't save - print out and abort
        if (empty($key_value)) {
          print $message;
          return;
        }
      }
      $fields['level'] = $level;
      $fields['message'] = $message;
      $this->connection
        ->insert($this->messageTable)
        ->fields($fields)
        ->execute();
    }
    else {

      // TODO: What else can we do?
      Migration::displayMessage($message);
    }
  }

  /**
   * Prepares this migration to run as an update - that is, in addition to
   * unmigrated content (source records not in the map table) being imported,
   * previously-migrated content will also be updated in place.
   */
  public function prepareUpdate() {
    $this->connection
      ->update($this->mapTable)
      ->fields(array(
      'needs_update' => MigrateMap::STATUS_NEEDS_UPDATE,
    ))
      ->execute();
  }

  /**
   * Returns a count of records in the map table (i.e., the number of
   * source records which have been processed for this migration).
   *
   * @return int
   */
  public function processedCount() {
    $query = $this->connection
      ->select($this->mapTable);
    $query
      ->addExpression('COUNT(*)', 'count');
    $count = $query
      ->execute()
      ->fetchField();
    return $count;
  }

  /**
   * Returns a count of imported records in the map table.
   *
   * @return int
   */
  public function importedCount() {
    $query = $this->connection
      ->select($this->mapTable);
    $query
      ->addExpression('COUNT(*)', 'count');
    $query
      ->condition('needs_update', array(
      MigrateMap::STATUS_IMPORTED,
      MigrateMap::STATUS_NEEDS_UPDATE,
    ), 'IN');
    $count = $query
      ->execute()
      ->fetchField();
    return $count;
  }

  /**
   * Returns a count of records which are marked as needing update.
   *
   * @return int
   */
  public function updateCount() {
    $query = $this->connection
      ->select($this->mapTable);
    $query
      ->addExpression('COUNT(*)', 'count');
    $query
      ->condition('needs_update', MigrateMap::STATUS_NEEDS_UPDATE);
    $count = $query
      ->execute()
      ->fetchField();
    return $count;
  }

  /**
   * Get the number of source records which failed to import.
   *
   * @return int
   *  Number of records errored out.
   */
  public function errorCount() {
    $query = $this->connection
      ->select($this->mapTable);
    $query
      ->addExpression('COUNT(*)', 'count');
    $query
      ->condition('needs_update', MigrateMap::STATUS_FAILED);
    $count = $query
      ->execute()
      ->fetchField();
    return $count;
  }

  /**
   * Get the number of messages saved.
   *
   * @return int
   *  Number of messages.
   */
  public function messageCount() {
    $query = $this->connection
      ->select($this->messageTable);
    $query
      ->addExpression('COUNT(*)', 'count');
    $count = $query
      ->execute()
      ->fetchField();
    return $count;
  }

  /**
   * Delete the map entry and any message table entries for the specified source row.
   *
   * @param array $source_key
   */
  public function delete(array $source_key, $messages_only = FALSE) {
    if (!$messages_only) {
      $map_query = $this->connection
        ->delete($this->mapTable);
    }
    $message_query = $this->connection
      ->delete($this->messageTable);
    $count = 1;
    foreach ($source_key as $key_value) {
      if (!$messages_only) {
        $map_query
          ->condition('sourceid' . $count, $key_value);
      }
      $message_query
        ->condition('sourceid' . $count, $key_value);
      $count++;
    }
    if (!$messages_only) {
      $map_query
        ->execute();
    }
    $message_query
      ->execute();
  }

  /**
   * Delete the map entry and any message table entries for the specified destination row.
   *
   * @param array $destination_key
   */
  public function deleteDestination(array $destination_key) {
    $map_query = $this->connection
      ->delete($this->mapTable);
    $message_query = $this->connection
      ->delete($this->messageTable);
    $source_key = $this
      ->lookupSourceID($destination_key);
    if (!empty($source_key)) {
      $count = 1;
      foreach ($destination_key as $key_value) {
        $map_query
          ->condition('destid' . $count, $key_value);
        $count++;
      }
      $map_query
        ->execute();
      $count = 1;
      foreach ($source_key as $key_value) {
        $message_query
          ->condition('sourceid' . $count, $key_value);
        $count++;
      }
      $message_query
        ->execute();
    }
  }

  /**
   * Set the specified row to be updated, if it exists.
   */
  public function setUpdate(array $source_key) {
    $query = $this->connection
      ->update($this->mapTable)
      ->fields(array(
      'needs_update' => MigrateMap::STATUS_NEEDS_UPDATE,
    ));
    $count = 1;
    foreach ($source_key as $key_value) {
      $query
        ->condition('sourceid' . $count++, $key_value);
    }
    $query
      ->execute();
  }

  /**
   * Delete all map and message table entries specified.
   *
   * @param array $source_keys
   *  Each array member is an array of key fields for one source row.
   */
  public function deleteBulk(array $source_keys) {

    // If we have a single-column key, we can shortcut it
    if (count($this->sourceKey) == 1) {
      $sourceids = array();
      foreach ($source_keys as $source_key) {
        $sourceids[] = $source_key;
      }
      $this->connection
        ->delete($this->mapTable)
        ->condition('sourceid1', $sourceids, 'IN')
        ->execute();
      $this->connection
        ->delete($this->messageTable)
        ->condition('sourceid1', $sourceids, 'IN')
        ->execute();
    }
    else {
      foreach ($source_keys as $source_key) {
        $map_query = $this->connection
          ->delete($this->mapTable);
        $message_query = $this->connection
          ->delete($this->messageTable);
        $count = 1;
        foreach ($source_key as $key_value) {
          $map_query
            ->condition('sourceid' . $count, $key_value);
          $message_query
            ->condition('sourceid' . $count++, $key_value);
        }
        $map_query
          ->execute();
        $message_query
          ->execute();
      }
    }
  }

  /**
   * Clear all messages from the message table.
   */
  public function clearMessages() {
    $this->connection
      ->truncate($this->messageTable)
      ->execute();
  }

  /**
   * Remove the associated map and message tables.
   */
  public function destroy() {
    $this->connection
      ->schema()
      ->dropTable($this->mapTable);
    $this->connection
      ->schema()
      ->dropTable($this->messageTable);
  }
  protected $result = NULL;
  protected $currentRow = NULL;
  protected $currentKey = array();
  public function getCurrentKey() {
    return $this->currentKey;
  }

  /**
   * Implementation of Iterator::rewind() - called before beginning a foreach loop.
   * TODO: Support idlist, itemlimit
   */
  public function rewind() {
    $this->currentRow = NULL;
    $fields = array();
    foreach ($this->sourceKeyMap as $field) {
      $fields[] = $field;
    }
    foreach ($this->destinationKeyMap as $field) {
      $fields[] = $field;
    }

    /* TODO
       if (isset($this->options['itemlimit'])) {
         $query = $query->range(0, $this->options['itemlimit']);
       }
       */
    $this->result = $this->connection
      ->select($this->mapTable, 'map')
      ->fields('map', $fields)
      ->execute();
    $this
      ->next();
  }

  /**
   * Implementation of Iterator::current() - called when entering a loop
   * iteration, returning the current row
   */
  public function current() {
    return $this->currentRow;
  }

  /**
   * Implementation of Iterator::key - called when entering a loop iteration, returning
   * the key of the current row. It must be a scalar - we will serialize
   * to fulfill the requirement, but using getCurrentKey() is preferable.
   */
  public function key() {
    return serialize($this->currentKey);
  }

  /**
   * Implementation of Iterator::next() - called at the bottom of the loop implicitly,
   * as well as explicitly from rewind().
   */
  public function next() {
    $this->currentRow = $this->result
      ->fetchObject();
    $this->currentKey = array();
    if (!is_object($this->currentRow)) {
      $this->currentRow = NULL;
    }
    else {
      foreach ($this->sourceKeyMap as $map_field) {
        $this->currentKey[$map_field] = $this->currentRow->{$map_field};

        // Leave only destination fields
        unset($this->currentRow->{$map_field});
      }
    }
  }

  /**
   * Implementation of Iterator::valid() - called at the top of the loop, returning
   * TRUE to process the loop and FALSE to terminate it
   */
  public function valid() {

    // TODO: Check numProcessed against itemlimit
    return !is_null($this->currentRow);
  }

}

Members

Name	Modifiers	Type	Description
MigrateMap::$sourceKey	protected	property	Arrays of key fields for the source and destination. Array keys are the field names - array values are specific to the concrete map class.
MigrateMap::$sourceKeyMap	protected	property	Mapping from field names to the map/message table key names (e.g., from input_field to sourceid1, or from nid to destid1)
MigrateMap::$trackLastImported	protected	property	Boolean determining whether to track last_imported times in map tables
MigrateMap::ROLLBACK_DELETE		constant	Codes reflecting how to handle the destination item on rollback.
MigrateMap::ROLLBACK_PRESERVE		constant
MigrateMap::STATUS_FAILED		constant
MigrateMap::STATUS_IGNORED		constant
MigrateMap::STATUS_IMPORTED		constant	Codes reflecting the current status of a map row.
MigrateMap::STATUS_NEEDS_UPDATE		constant
MigrateSQLMap::$connection	protected	property	Drupal connection object on which to create the map/message tables
MigrateSQLMap::$currentKey	protected	property
MigrateSQLMap::$currentRow	protected	property
MigrateSQLMap::$ensured	protected	property	We don't need to check the tables more than once per request.
MigrateSQLMap::$mapTable	protected	property	Names of tables created for tracking the migration.
MigrateSQLMap::$result	protected	property
MigrateSQLMap::clearMessages	public	function	Clear all messages from the message table. Overrides MigrateMap::clearMessages
MigrateSQLMap::current	public	function	Implementation of Iterator::current() - called when entering a loop iteration, returning the current row
MigrateSQLMap::delete	public	function	Delete the map entry and any message table entries for the specified source row. Overrides MigrateMap::delete
MigrateSQLMap::deleteBulk	public	function	Delete all map and message table entries specified. Overrides MigrateMap::deleteBulk
MigrateSQLMap::deleteDestination	public	function	Delete the map entry and any message table entries for the specified destination row. Overrides MigrateMap::deleteDestination
MigrateSQLMap::destroy	public	function	Remove the associated map and message tables. Overrides MigrateMap::destroy
MigrateSQLMap::ensureTables	protected	function	Create the map and message tables if they don't already exist.
MigrateSQLMap::errorCount	public	function	Get the number of source records which failed to import. Overrides MigrateMap::errorCount
MigrateSQLMap::getConnection	public	function
MigrateSQLMap::getCurrentKey	public	function
MigrateSQLMap::getDestinationKey	public	function	Overrides MigrateMap::getDestinationKey
MigrateSQLMap::getMapTable	public	function
MigrateSQLMap::getMessageTable	public	function
MigrateSQLMap::getQualifiedMapTable	public	function	Qualifying the map table name with the database name makes cross-db joins possible. Note that, because prefixes are applied after we do this (i.e., it will prefix the string we return), we do not qualify the table if it has a prefix. This will work…
MigrateSQLMap::getRowByDestination	public	function	Retrieve a row from the map table, given a destination ID Overrides MigrateMap::getRowByDestination
MigrateSQLMap::getRowBySource	public	function	Retrieve a row from the map table, given a source ID Overrides MigrateMap::getRowBySource
MigrateSQLMap::getRowsNeedingUpdate	public	function	Retrieve an array of map rows marked as needing update. Overrides MigrateMap::getRowsNeedingUpdate
MigrateSQLMap::getSourceKey	public	function	sourceKey and destinationKey arrays are keyed by the field names; values are the Drupal schema definition for the field. Overrides MigrateMap::getSourceKey
MigrateSQLMap::importedCount	public	function	Returns a count of imported records in the map table. Overrides MigrateMap::importedCount
MigrateSQLMap::key	public	function	Implementation of Iterator::key - called when entering a loop iteration, returning the key of the current row. It must be a scalar - we will serialize to fulfill the requirement, but using getCurrentKey() is preferable.
MigrateSQLMap::lookupDestinationID	public	function	Given a (possibly multi-field) source key, return the (possibly multi-field) destination key it is mapped to. Overrides MigrateMap::lookupDestinationID
MigrateSQLMap::lookupSourceID	public	function	Given a (possibly multi-field) destination key, return the (possibly multi-field) source key mapped to it. Overrides MigrateMap::lookupSourceID
MigrateSQLMap::messageCount	public	function	Get the number of messages saved. Overrides MigrateMap::messageCount
MigrateSQLMap::next	public	function	Implementation of Iterator::next() - called at the bottom of the loop implicitly, as well as explicitly from rewind().
MigrateSQLMap::prepareUpdate	public	function	Prepares this migration to run as an update - that is, in addition to unmigrated content (source records not in the map table) being imported, previously-migrated content will also be updated in place. Overrides MigrateMap::prepareUpdate
MigrateSQLMap::processedCount	public	function	Returns a count of records in the map table (i.e., the number of source records which have been processed for this migration). Overrides MigrateMap::processedCount
MigrateSQLMap::rewind	public	function	Implementation of Iterator::rewind() - called before beginning a foreach loop. TODO: Support idlist, itemlimit
MigrateSQLMap::saveIDMapping	public	function	Called upon import of one record, we record a mapping from the source key to the destination key. Also may be called, setting the third parameter to NEEDS_UPDATE, to signal an existing record should be remigrated. Overrides MigrateMap::saveIDMapping
MigrateSQLMap::saveMessage	public	function	Record a message in the migration's message table. Overrides MigrateMap::saveMessage
MigrateSQLMap::setUpdate	public	function	Set the specified row to be updated, if it exists.
MigrateSQLMap::updateCount	public	function	Returns a count of records which are marked as needing update.
MigrateSQLMap::valid	public	function	Implementation of Iterator::valid() - called at the top of the loop, returning TRUE to process the loop and FALSE to terminate it
MigrateSQLMap::__construct	public	function

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class MigrateSQLMap in Migrate 6.2

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