drupal/includes/database.pgsql.inc

<?php
// $Id$

/**
 * @file
 * Database interface code for PostgreSQL database servers.
 */

/**
 * @ingroup database
 * @{
 */

/**
 * Report database status.
 */
function db_status_report() {
  $t = get_t();

  $version = db_version();

  $form['pgsql'] = array(
    'title' => $t('PostgreSQL database'),
    'value' => $version,
  );

  if (version_compare($version, DRUPAL_MINIMUM_PGSQL) < 0) {
    $form['pgsql']['severity'] = REQUIREMENT_ERROR;
    $form['pgsql']['description'] = $t('Your PostgreSQL Server is too old. Drupal requires at least PostgreSQL %version.', array('%version' => DRUPAL_MINIMUM_PGSQL));
  }

  return $form;
}

/**
 * Returns the version of the database server currently in use.
 *
 * @return Database server version
 */
function db_version() {
  return db_result(db_query("SHOW SERVER_VERSION"));
}

/**
 * Initialize a database connection.
 */
function db_connect($url) {
   // Check if MySQL support is present in PHP
  if (!function_exists('pg_connect')) {
    drupal_maintenance_theme();
    drupal_set_title('PHP PostgreSQL support not enabled');
    print theme('maintenance_page', '<p>We were unable to use the PostgreSQL database because the PostgreSQL extension for PHP is not installed. Check your <code>PHP.ini</code> to see how you can enable it.</p>
<p>For more help, see the <a href="http://drupal.org/node/258">Installation and upgrading handbook</a>. If you are unsure what these terms mean you should probably contact your hosting provider.</p>');
    exit;
  }

  $url = parse_url($url);
  $conn_string = '';

  // Decode url-encoded information in the db connection string
  if (isset($url['user'])) {
    $conn_string .= ' user='. urldecode($url['user']);
  }
  if (isset($url['pass'])) {
    $conn_string .= ' password='. urldecode($url['pass']);
  }
  if (isset($url['host'])) {
    $conn_string .= ' host='. urldecode($url['host']);
  }
  if (isset($url['path'])) {
    $conn_string .= ' dbname='. substr(urldecode($url['path']), 1);
  }
  if (isset($url['port'])) {
    $conn_string .= ' port='. urldecode($url['port']);
  }

  // pg_last_error() does not return a useful error message for database
  // connection errors. We must turn on error tracking to get at a good error
  // message, which will be stored in $php_errormsg.
  $track_errors_previous = ini_get('track_errors');
  ini_set('track_errors', 1);

  $connection = @pg_connect($conn_string);
  if (!$connection) {
    drupal_maintenance_theme();
    drupal_set_header('HTTP/1.1 503 Service Unavailable');
    drupal_set_title('Unable to connect to database');
    print theme('maintenance_page', '<p>If you still have to install Drupal, proceed to the <a href="'. base_path() .'install.php">installation page</a>.</p>
<p>If you have already finished installed Drupal, this either means that the username and password information in your <code>settings.php</code> file is incorrect or that we can\'t connect to the PostgreSQL database server. This could mean your hosting provider\'s database server is down.</p>
<p>The PostgreSQL error was: '. theme('placeholder', decode_entities($php_errormsg)) .'</p>
<p>Currently, the database is '. theme('placeholder', substr($url['path'], 1)) .', the username is '. theme('placeholder', $url['user']) .', and the database server is '. theme('placeholder', $url['host']) .'.</p>
<ul>
  <li>Are you sure you have the correct username and password?</li>
  <li>Are you sure that you have typed the correct hostname?</li>
  <li>Are you sure you have the correct database name?</li>
  <li>Are you sure that the database server is running?</li>
</ul>
<p>For more help, see the <a href="http://drupal.org/node/258">Installation and upgrading handbook</a>. If you are unsure what these terms mean you should probably contact your hosting provider.</p>');
    exit;
  }

  // Restore error tracking setting
  ini_set('track_errors', $track_errors_previous);

  return $connection;
}

/**
 * Runs a basic query in the active database.
 *
 * User-supplied arguments to the query should be passed in as separate
 * parameters so that they can be properly escaped to avoid SQL injection
 * attacks.
 *
 * @param $query
 *   A string containing an SQL query.
 * @param ...
 *   A variable number of arguments which are substituted into the query
 *   using printf() syntax. Instead of a variable number of query arguments,
 *   you may also pass a single array containing the query arguments.
 *
 *   Valid %-modifiers are: %s, %d, %f, %b (binary data, do not enclose
 *   in '') and %%.
 *
 *   NOTE: using this syntax will cast NULL and FALSE values to decimal 0,
 *   and TRUE values to decimal 1.
 *
 * @return
 *   A database query result resource, or FALSE if the query was not
 *   executed correctly.
 */
function db_query($query) {
  $args = func_get_args();
  array_shift($args);
  $query = db_prefix_tables($query);
  if (isset($args[0]) and is_array($args[0])) { // 'All arguments in one array' syntax
    $args = $args[0];
  }
  _db_query_callback($args, TRUE);
  $query = preg_replace_callback(DB_QUERY_REGEXP, '_db_query_callback', $query);
  return _db_query($query);
}

/**
 * Helper function for db_query().
 */
function _db_query($query, $debug = 0) {
  global $active_db, $last_result, $queries;

  if (variable_get('dev_query', 0)) {
    list($usec, $sec) = explode(' ', microtime());
    $timer = (float)$usec + (float)$sec;
  }

  $last_result = pg_query($active_db, $query);

  if (variable_get('dev_query', 0)) {
    $bt = debug_backtrace();
    $query = $bt[2]['function'] ."\n". $query;
    list($usec, $sec) = explode(' ', microtime());
    $stop = (float)$usec + (float)$sec;
    $diff = $stop - $timer;
    $queries[] = array($query, $diff);
  }

  if ($debug) {
    print '<p>query: '. $query .'<br />error:'. pg_last_error($active_db) .'</p>';
  }

  if ($last_result !== FALSE) {
    return $last_result;
  }
  else {
    trigger_error(check_plain(pg_last_error($active_db) ."\nquery: ". $query), E_USER_WARNING);
    return FALSE;
  }
}

/**
 * Fetch one result row from the previous query as an object.
 *
 * @param $result
 *   A database query result resource, as returned from db_query().
 * @return
 *   An object representing the next row of the result. The attributes of this
 *   object are the table fields selected by the query.
 */
function db_fetch_object($result) {
  if ($result) {
    return pg_fetch_object($result);
  }
}

/**
 * Fetch one result row from the previous query as an array.
 *
 * @param $result
 *   A database query result resource, as returned from db_query().
 * @return
 *   An associative array representing the next row of the result. The keys of
 *   this object are the names of the table fields selected by the query, and
 *   the values are the field values for this result row.
 */
function db_fetch_array($result) {
  if ($result) {
    return pg_fetch_assoc($result);
  }
}

/**
 * Determine how many result rows were found by the preceding query.
 *
 * @param $result
 *   A database query result resource, as returned from db_query().
 * @return
 *   The number of result rows.
 */
function db_num_rows($result) {
  if ($result) {
    return pg_num_rows($result);
  }
}

/**
 * Return an individual result field from the previous query.
 *
 * Only use this function if exactly one field is being selected; otherwise,
 * use db_fetch_object() or db_fetch_array().
 *
 * @param $result
 *   A database query result resource, as returned from db_query().
 * @param $row
 *   The index of the row whose result is needed.
 * @return
 *   The resulting field or FALSE.
 */
function db_result($result, $row = 0) {
  if ($result && pg_num_rows($result) > $row) {
    $res = pg_fetch_row($result, $row);

    return $res[0];
  }
  return FALSE;
}

/**
 * Determine whether the previous query caused an error.
 */
function db_error() {
  global $active_db;
  return pg_last_error($active_db);
}

/**
 * Returns the last insert id. This function is thread safe.
 *
 * @param $table
 *   The name of the table you inserted into.
 * @param $field
 *   The name of the autoincrement field.
 */
function db_last_insert_id($table, $field) {
  return db_result(db_query("SELECT currval('%s_seq')", db_prefix_tables('{'. $table .'}') . '_'. $field));
}

/**
 * Determine the number of rows changed by the preceding query.
 */
function db_affected_rows() {
  global $last_result;
  return pg_affected_rows($last_result);
}

/**
 * Runs a limited-range query in the active database.
 *
 * Use this as a substitute for db_query() when a subset of the query
 * is to be returned.
 * User-supplied arguments to the query should be passed in as separate
 * parameters so that they can be properly escaped to avoid SQL injection
 * attacks.
 *
 * @param $query
 *   A string containing an SQL query.
 * @param ...
 *   A variable number of arguments which are substituted into the query
 *   using printf() syntax. Instead of a variable number of query arguments,
 *   you may also pass a single array containing the query arguments.
 *   Valid %-modifiers are: %s, %d, %f, %b (binary data, do not enclose
 *   in '') and %%.
 *
 *   NOTE: using this syntax will cast NULL and FALSE values to decimal 0,
 *   and TRUE values to decimal 1.
 *
 * @param $from
 *   The first result row to return.
 * @param $count
 *   The maximum number of result rows to return.
 * @return
 *   A database query result resource, or FALSE if the query was not executed
 *   correctly.
 */
function db_query_range($query) {
  $args = func_get_args();
  $count = array_pop($args);
  $from = array_pop($args);
  array_shift($args);

  $query = db_prefix_tables($query);
  if (isset($args[0]) and is_array($args[0])) { // 'All arguments in one array' syntax
    $args = $args[0];
  }
  _db_query_callback($args, TRUE);
  $query = preg_replace_callback(DB_QUERY_REGEXP, '_db_query_callback', $query);
  $query .= ' LIMIT '. (int)$count .' OFFSET '. (int)$from;
  return _db_query($query);
}

/**
 * Runs a SELECT query and stores its results in a temporary table.
 *
 * Use this as a substitute for db_query() when the results need to stored
 * in a temporary table. Temporary tables exist for the duration of the page
 * request.
 * User-supplied arguments to the query should be passed in as separate parameters
 * so that they can be properly escaped to avoid SQL injection attacks.
 *
 * Note that if you need to know how many results were returned, you should do
 * a SELECT COUNT(*) on the temporary table afterwards. db_num_rows() and
 * db_affected_rows() do not give consistent result across different database
 * types in this case.
 *
 * @param $query
 *   A string containing a normal SELECT SQL query.
 * @param ...
 *   A variable number of arguments which are substituted into the query
 *   using printf() syntax. The query arguments can be enclosed in one
 *   array instead.
 *   Valid %-modifiers are: %s, %d, %f, %b (binary data, do not enclose
 *   in '') and %%.
 *
 *   NOTE: using this syntax will cast NULL and FALSE values to decimal 0,
 *   and TRUE values to decimal 1.
 *
 * @param $table
 *   The name of the temporary table to select into. This name will not be
 *   prefixed as there is no risk of collision.
 * @return
 *   A database query result resource, or FALSE if the query was not executed
 *   correctly.
 */
function db_query_temporary($query) {
  $args = func_get_args();
  $tablename = array_pop($args);
  array_shift($args);

  $query = preg_replace('/^SELECT/i', 'CREATE TEMPORARY TABLE '. $tablename .' AS SELECT', db_prefix_tables($query));
  if (isset($args[0]) and is_array($args[0])) { // 'All arguments in one array' syntax
    $args = $args[0];
  }
  _db_query_callback($args, TRUE);
  $query = preg_replace_callback(DB_QUERY_REGEXP, '_db_query_callback', $query);
  return _db_query($query);
}

/**
 * Returns a properly formatted Binary Large OBject value.
 * In case of PostgreSQL encodes data for insert into bytea field.
 *
 * @param $data
 *   Data to encode.
 * @return
 *  Encoded data.
 */
function db_encode_blob($data) {
  return "'". pg_escape_bytea($data) ."'";
}

/**
 * Returns text from a Binary Large OBject value.
 * In case of PostgreSQL decodes data after select from bytea field.
 *
 * @param $data
 *   Data to decode.
 * @return
 *  Decoded data.
 */
function db_decode_blob($data) {
  return pg_unescape_bytea($data);
}

/**
 * Prepare user input for use in a database query, preventing SQL injection attacks.
 * Note: This function requires PostgreSQL 7.2 or later.
 */
function db_escape_string($text) {
  return pg_escape_string($text);
}

/**
 * Lock a table.
 * This function automatically starts a transaction.
 */
function db_lock_table($table) {
  db_query('BEGIN; LOCK TABLE {'. db_escape_table($table) .'} IN EXCLUSIVE MODE');
}

/**
 * Unlock all locked tables.
 * This function automatically commits a transaction.
 */
function db_unlock_tables() {
  db_query('COMMIT');
}

/**
 * Check if a table exists.
 */
function db_table_exists($table) {
  return db_num_rows(db_query("SELECT relname FROM pg_class WHERE relname = '{". db_escape_table($table) ."}'"));
}

/**
 * Check if a column exists in the given table.
 */
function db_column_exists($table, $column) {
  return db_result(db_query("SELECT COUNT(pg_attribute.attname) FROM pg_class, pg_attribute WHERE pg_attribute.attrelid = pg_class.oid AND pg_class.relname = '{". db_escape_table($table) ."}' AND attname='%s'", $column));
}

/**
 * Verify if the database is set up correctly.
 */
function db_check_setup() {
  $t = get_t();

  $encoding = db_result(db_query('SHOW server_encoding'));
  if (!in_array(strtolower($encoding), array('unicode', 'utf8'))) {
    drupal_set_message($t('Your PostgreSQL database is set up with the wrong character encoding (%encoding). It is possible it will not work as expected. It is advised to recreate it with UTF-8/Unicode encoding. More information can be found in the <a href="@url">PostgreSQL documentation</a>.', array('%encoding' => $encoding, '@url' => 'http://www.postgresql.org/docs/7.4/interactive/multibyte.html')), 'status');
  }
}

/**
 * Wraps the given table.field entry with a DISTINCT(). The wrapper is added to
 * the SELECT list entry of the given query and the resulting query is returned.
 * This function only applies the wrapper if a DISTINCT doesn't already exist in
 * the query.
 *
 * @param $table Table containing the field to set as DISTINCT
 * @param $field Field to set as DISTINCT
 * @param $query Query to apply the wrapper to
 * @return SQL query with the DISTINCT wrapper surrounding the given table.field.
 */
function db_distinct_field($table, $field, $query) {
  $field_to_select = 'DISTINCT ON ('. $table .'.'. $field .") $table.$field";
  // (?<!text) is a negative look-behind (no need to rewrite queries that already use DISTINCT).
  $query = preg_replace('/(SELECT.*)(?:'. $table .'\.|\s)(?<!DISTINCT\()(?<!DISTINCT\('. $table .'\.)'. $field .'(.*FROM )/AUsi', '\1 '. $field_to_select .'\2', $query);
  $query = preg_replace('/(ORDER BY )(?!'. $table .'\.'. $field .')/', '\1'."$table.$field, ", $query);
  return $query;
}

/**
 * @} End of "ingroup database".
 */

/**
 * @ingroup schemaapi
 * @{
 */

/**
 * This maps a generic data type in combination with its data size
 * to the engine-specific data type.
 */
function db_type_map() {
  // Put :normal last so it gets preserved by array_flip.  This makes
  // it much easier for modules (such as schema.module) to map
  // database types back into schema types.
  $map = array(
    'varchar:normal' => 'varchar',

    'text:tiny' => 'text',
    'text:small' => 'text',
    'text:medium' => 'text',
    'text:big' => 'text',
    'text:normal' => 'text',

    'int:tiny' => 'smallint',
    'int:small' => 'smallint',
    'int:medium' => 'int',
    'int:big' => 'bigint',
    'int:normal' => 'int',

    'float:tiny' => 'real',
    'float:small' => 'real',
    'float:medium' => 'real',
    'float:big' => 'double precision',
    'float:normal' => 'real',

    'numeric:normal'  => 'numeric',

    'blob:big' => 'bytea',
    'blob:normal' => 'bytea',

    'datetime:normal' => 'timestamp',

    'serial:tiny' => 'serial',
    'serial:small' => 'serial',
    'serial:medium' => 'serial',
    'serial:big' => 'bigserial',
    'serial:normal' => 'serial',
  );
  return $map;
}

/**
 * Generate SQL to create a new table from a Drupal schema definition.
 *
 * @param $name
 *   The name of the table to create.
 * @param $table
 *   A Schema API table definition array.
 * @return
 *   An array of SQL statements to create the table.
 */
function db_create_table_sql($name, $table) {
  $sql_fields = array();
  foreach ($table['fields'] as $field_name => $field) {
    $sql_fields[] = _db_create_field_sql($field_name, _db_process_field($field));
  }

  $sql_keys = array();
  if (isset($table['primary key']) && is_array($table['primary key'])) {
    $sql_keys[] = 'PRIMARY KEY ('. implode(', ', $table['primary key']) .')';
  }
  if (isset($table['unique keys']) && is_array($table['unique keys'])) {
    foreach ($table['unique keys'] as $key_name => $key) {
      $sql_keys[] = 'CONSTRAINT {'. $name .'}_'. $key_name .'_key UNIQUE ('. implode(', ', $key) .')';
    }
  }

  $sql = "CREATE TABLE {". $name ."} (\n\t";
  $sql .= implode(",\n\t", $sql_fields);
  if (count($sql_keys) > 0) {
    $sql .= ",\n\t";
  }
  $sql .= implode(",\n\t", $sql_keys);
  $sql .= "\n)";
  $statements[] = $sql;

  if (isset($table['indexes']) && is_array($table['indexes'])) {
    foreach ($table['indexes'] as $key_name => $key) {
      $statements[] = _db_create_index_sql($name, $key_name, $key);
    }
  }

  return $statements;
}

function _db_create_index_sql($table, $name, $fields) {
  $query = 'CREATE INDEX {'. $table .'}_'. $name .'_idx ON {'. $table .'} (';
  $query .= _db_create_key_sql($fields) .')';
  return $query;
}

function _db_create_key_sql($fields) {
  $ret = array();
  foreach ($fields as $field) {
    if (is_array($field)) {
      $ret[] = 'substr('. $field[0] .', 1, '. $field[1] .')';
    }
    else {
      $ret[] = $field;
    }
  }
  return implode(', ', $ret);
}

/**
 * Set database-engine specific properties for a field.
 *
 * @param $field
 *   A field description array, as specified in the schema documentation.
 */
function _db_process_field($field) {
  if (!isset($field['size'])) {
    $field['size'] = 'normal';
  }
  // Set the correct database-engine specific datatype.
  if (!isset($field['pgsql_type'])) {
    $map = db_type_map();
    $field['pgsql_type'] = $map[$field['type'] .':'. $field['size']];
  }
  if ($field['type'] == 'serial') {
    unset($field['not null']);
  }
  return $field;
}

/**
 * Create an SQL string for a field to be used in table creation or alteration.
 *
 * Before passing a field out of a schema definition into this function it has
 * to be processed by _db_process_field().
 *
 * @param $name
 *    Name of the field.
 * @param $spec
 *    The field specification, as per the schema data structure format.
 */
function _db_create_field_sql($name, $spec) {
  $sql = $name .' '. $spec['pgsql_type'];

  if ($spec['type'] == 'serial') {
    unset($spec['not null']);
  }
  if (!empty($spec['unsigned'])) {
    if ($spec['type'] == 'serial') {
      $sql .= " CHECK ($name >= 0)";
    }
    else {
      $sql .= '_unsigned';
    }
  }

  if (!empty($spec['length'])) {
    $sql .= '('. $spec['length'] .')';
  }
  elseif (isset($spec['precision']) && isset($spec['scale'])) {
    $sql .= '('. $spec['scale'] .', '. $spec['precision'] .')';
  }

  if (isset($spec['not null']) && $spec['not null']) {
   $sql .= ' NOT NULL';
  }
  if (isset($spec['default'])) {
    $default = is_string($spec['default']) ? "'". $spec['default'] ."'" : $spec['default'];
    $sql .= " default $default";
  }

  return $sql;
}

/**
 * Rename a table.
 *
 * @param $ret
 *   Array to which query results will be added.
 * @param $table
 *   The table to be renamed.
 * @param $new_name
 *   The new name for the table.
 */
function db_rename_table(&$ret, $table, $new_name) {
  $ret[] = update_sql('ALTER TABLE {'. $table .'} RENAME TO {'. $new_name .'}');
}

/**
 * Drop a table.
 *
 * @param $ret
 *   Array to which query results will be added.
 * @param $table
 *   The table to be dropped.
 */
function db_drop_table(&$ret, $table) {
  $ret[] = update_sql('DROP TABLE {'. $table .'}');
}

/**
 * Add a new field to a table.
 *
 * @param $ret
 *   Array to which query results will be added.
 * @param $table
 *   Name of the table to be altered.
 * @param $field
 *   Name of the field to be added.
 * @param $spec
 *   The field specification array, as taken from a schema definition
 */
function db_add_field(&$ret, $table, $field, $spec) {
  $query = 'ALTER TABLE {'. $table .'} ADD COLUMN ';
  $query .= _db_create_field_sql($field, _db_process_field($spec));
  $ret[] = update_sql($query);
}

/**
 * Drop a field.
 *
 * @param $ret
 *   Array to which query results will be added.
 * @param $table
 *   The table to be altered.
 * @param $field
 *   The field to be dropped.
 */
function db_drop_field(&$ret, $table, $field) {
  $ret[] = update_sql('ALTER TABLE {'. $table .'} DROP COLUMN '. $field);
}

/**
 * Set the default value for a field.
 *
 * @param $ret
 *   Array to which query results will be added.
 * @param $table
 *   The table to be altered.
 * @param $field
 *   The field to be altered.
 * @param $default
 *   Default value to be set. NULL for 'default NULL'.
 */
function db_field_set_default(&$ret, $table, $field, $default) {
  if ($default == NULL) {
    $default = 'NULL';
  }
  else {
    $default = is_string($default) ? "'$default'" : $default;
  }

  $ret[] = update_sql('ALTER TABLE {'. $table .'} ALTER COLUMN '. $field .' SET DEFAULT '. $default);
}

/**
 * Set a field to have no default value.
 *
 * @param $ret
 *   Array to which query results will be added.
 * @param $table
 *   The table to be altered.
 * @param $field
 *   The field to be altered.
 */
function db_field_set_no_default(&$ret, $table, $field) {
  $ret[] = update_sql('ALTER TABLE {'. $table .'} ALTER COLUMN '. $field .' DROP DEFAULT');
}

/**
 * Add a primary key.
 *
 * @param $ret
 *   Array to which query results will be added.
 * @param $table
 *   The table to be altered.
 * @param $fields
 *   Fields for the primary key.
 */
function db_add_primary_key(&$ret, $table, $fields) {
  $ret[] = update_sql('ALTER TABLE {'. $table .'} ADD PRIMARY KEY ('.
    implode(',', $fields) .')');
}

/**
 * Drop the primary key.
 *
 * @param $ret
 *   Array to which query results will be added.
 * @param $table
 *   The table to be altered.
 */
function db_drop_primary_key(&$ret, $table) {
  $ret[] = update_sql('ALTER TABLE {'. $table .'} DROP CONSTRAINT {'. $table .'}_pkey');
}

/**
 * Add a unique key.
 *
 * @param $ret
 *   Array to which query results will be added.
 * @param $table
 *   The table to be altered.
 * @param $name
 *   The name of the key.
 * @param $fields
 *   An array of field names.
 */
function db_add_unique_key(&$ret, $table, $name, $fields) {
  $name = '{'. $table .'}_'. $name .'_key';
  $ret[] = update_sql('ALTER TABLE {'. $table .'} ADD CONSTRAINT '.
    $name .' UNIQUE ('. implode(',', $fields) .')');
}

/**
 * Drop a unique key.
 *
 * @param $ret
 *   Array to which query results will be added.
 * @param $table
 *   The table to be altered.
 * @param $name
 *   The name of the key.
 */
function db_drop_unique_key(&$ret, $table, $name) {
  $name = '{'. $table .'}_'. $name .'_key';
  $ret[] = update_sql('ALTER TABLE {'. $table .'} DROP CONSTRAINT '. $name);
}

/**
 * Add an index.
 *
 * @param $ret
 *   Array to which query results will be added.
 * @param $table
 *   The table to be altered.
 * @param $name
 *   The name of the index.
 * @param $fields
 *   An array of field names.
 */
function db_add_index(&$ret, $table, $name, $fields) {
  $ret[] = update_sql(_db_create_index_sql($table, $name, $fields));
}

/**
 * Drop an index.
 *
 * @param $ret
 *   Array to which query results will be added.
 * @param $table
 *   The table to be altered.
 * @param $name
 *   The name of the index.
 */
function db_drop_index(&$ret, $table, $name) {
  $name = '{'. $table .'}_'. $name .'_idx';
  $ret[] = update_sql('DROP INDEX '. $name);
}

/**
 * Change a field definition.
 *
 * Remember that changing a field definition involves adding a new field
 * and dropping an old one. This means that any indices, primary keys and
 * sequences from serial-type fields are dropped and might need to be
 * recreated.
 *
 * @param $ret
 *   Array to which query results will be added.
 * @param $table
 *   Name of the table.
 * @param $field
 *   Name of the field to change.
 * @param $field_new
 *   New name for the field (set to the same as $field if you don't want to change the name).
 * @param $spec
 *   The field specification for the new field.
 */
function db_change_field(&$ret, $table, $field, $field_new, $spec) {
  $ret[] = update_sql("ALTER TABLE {". $table ."} RENAME $field TO ". $field ."_old");
  $not_null = isset($spec['not null']) ? $spec['not null'] : FALSE;
  unset($spec['not null']);
  db_add_field($ret, $table, "$field_new", $spec);
  $ret[] = update_sql("UPDATE {". $table ."} SET $field_new = ". $field ."_old");
  if ($not_null) {
    $ret[] = update_sql("ALTER TABLE {". $table ."} ALTER $field_new SET NOT NULL");
  }
  db_drop_field($ret, $table, $field .'_old');
}

/**
 * Update a field definition to match its schema. If the field is
 * involved in any keys or indexes, recreate them if necessary.
 *
 * @param $ret
 *   Array to which query results will be added.
 * @param $table
 *   Name of the table.
 * @param $field
 *   Name of the field to update.
 */
function db_update_field(&$ret, $table, $field) {
  $spec = drupal_get_schema($table);

  db_change_field($ret, $table, $field, $field, $spec['fields'][$field]);
  if (isset($spec['primary key'])) {
    if (array_search($field, db_field_names($spec['primary key'])) !== FALSE) {
      db_add_primary_key($ret, $table, $spec['primary key']);
    }
  }
  if (isset($spec['unique keys'])) {
    foreach ($spec['unique keys'] as $name => $fields) {
      if (array_search($field, db_field_names($fields)) !== FALSE) {
        db_add_unique_key($ret, $table, $fields);
      }
    }
  }
  if (isset($spec['indexes'])) {
    foreach ($spec['indexes'] as $name => $fields) {
      if (array_search($field, db_field_names($fields)) !== FALSE) {
        db_add_index($ret, $table, $fields);
      }
    }
  }
}

/**
 * @} End of "ingroup schemaapi".
 */