webmaster@1: <?php
webmaster@1: // $Id: database.mysql-common.inc,v 1.17.2.1 2008/02/07 10:17:26 goba Exp $
webmaster@1: 
webmaster@1: /**
webmaster@1:  * @file
webmaster@1:  * Functions shared between mysql and mysqli database engines.
webmaster@1:  */
webmaster@1: 
webmaster@1: /**
webmaster@1:  * Runs a basic query in the active database.
webmaster@1:  *
webmaster@1:  * User-supplied arguments to the query should be passed in as separate
webmaster@1:  * parameters so that they can be properly escaped to avoid SQL injection
webmaster@1:  * attacks.
webmaster@1:  *
webmaster@1:  * @param $query
webmaster@1:  *   A string containing an SQL query.
webmaster@1:  * @param ...
webmaster@1:  *   A variable number of arguments which are substituted into the query
webmaster@1:  *   using printf() syntax. Instead of a variable number of query arguments,
webmaster@1:  *   you may also pass a single array containing the query arguments.
webmaster@1:  *
webmaster@1:  *   Valid %-modifiers are: %s, %d, %f, %b (binary data, do not enclose
webmaster@1:  *   in '') and %%.
webmaster@1:  *
webmaster@1:  *   NOTE: using this syntax will cast NULL and FALSE values to decimal 0,
webmaster@1:  *   and TRUE values to decimal 1.
webmaster@1:  *
webmaster@1:  * @return
webmaster@1:  *   A database query result resource, or FALSE if the query was not
webmaster@1:  *   executed correctly.
webmaster@1:  */
webmaster@1: function db_query($query) {
webmaster@1:   $args = func_get_args();
webmaster@1:   array_shift($args);
webmaster@1:   $query = db_prefix_tables($query);
webmaster@1:   if (isset($args[0]) and is_array($args[0])) { // 'All arguments in one array' syntax
webmaster@1:     $args = $args[0];
webmaster@1:   }
webmaster@1:   _db_query_callback($args, TRUE);
webmaster@1:   $query = preg_replace_callback(DB_QUERY_REGEXP, '_db_query_callback', $query);
webmaster@1:   return _db_query($query);
webmaster@1: }
webmaster@1: 
webmaster@1: /**
webmaster@1:  * @ingroup schemaapi
webmaster@1:  * @{
webmaster@1:  */
webmaster@1: 
webmaster@1: /**
webmaster@1:  * Generate SQL to create a new table from a Drupal schema definition.
webmaster@1:  *
webmaster@1:  * @param $name
webmaster@1:  *   The name of the table to create.
webmaster@1:  * @param $table
webmaster@1:  *   A Schema API table definition array.
webmaster@1:  * @return
webmaster@1:  *   An array of SQL statements to create the table.
webmaster@1:  */
webmaster@1: function db_create_table_sql($name, $table) {
webmaster@1: 
webmaster@1:   if (empty($table['mysql_suffix'])) {
webmaster@1:     $table['mysql_suffix'] = "/*!40100 DEFAULT CHARACTER SET UTF8 */";
webmaster@1:   }
webmaster@1: 
webmaster@1:   $sql = "CREATE TABLE {". $name ."} (\n";
webmaster@1: 
webmaster@1:   // Add the SQL statement for each field.
webmaster@1:   foreach ($table['fields'] as $field_name => $field) {
webmaster@1:     $sql .= _db_create_field_sql($field_name, _db_process_field($field)) .", \n";
webmaster@1:   }
webmaster@1: 
webmaster@1:   // Process keys & indexes.
webmaster@1:   $keys = _db_create_keys_sql($table);
webmaster@1:   if (count($keys)) {
webmaster@1:     $sql .= implode(", \n", $keys) .", \n";
webmaster@1:   }
webmaster@1: 
webmaster@1:   // Remove the last comma and space.
webmaster@1:   $sql = substr($sql, 0, -3) ."\n) ";
webmaster@1: 
webmaster@1:   $sql .= $table['mysql_suffix'];
webmaster@1: 
webmaster@1:   return array($sql);
webmaster@1: }
webmaster@1: 
webmaster@1: function _db_create_keys_sql($spec) {
webmaster@1:   $keys = array();
webmaster@1: 
webmaster@1:   if (!empty($spec['primary key'])) {
webmaster@1:     $keys[] = 'PRIMARY KEY ('. _db_create_key_sql($spec['primary key']) .')';
webmaster@1:   }
webmaster@1:   if (!empty($spec['unique keys'])) {
webmaster@1:     foreach ($spec['unique keys'] as $key => $fields) {
webmaster@1:       $keys[] = 'UNIQUE KEY '. $key .' ('. _db_create_key_sql($fields) .')';
webmaster@1:     }
webmaster@1:   }
webmaster@1:   if (!empty($spec['indexes'])) {
webmaster@1:     foreach ($spec['indexes'] as $index => $fields) {
webmaster@1:       $keys[] = 'INDEX '. $index .' ('. _db_create_key_sql($fields) .')';
webmaster@1:     }
webmaster@1:   }
webmaster@1: 
webmaster@1:   return $keys;
webmaster@1: }
webmaster@1: 
webmaster@1: function _db_create_key_sql($fields) {
webmaster@1:   $ret = array();
webmaster@1:   foreach ($fields as $field) {
webmaster@1:     if (is_array($field)) {
webmaster@1:       $ret[] = $field[0] .'('. $field[1] .')';
webmaster@1:     }
webmaster@1:     else {
webmaster@1:       $ret[] = $field;
webmaster@1:     }
webmaster@1:   }
webmaster@1:   return implode(', ', $ret);
webmaster@1: }
webmaster@1: 
webmaster@1: /**
webmaster@1:  * Set database-engine specific properties for a field.
webmaster@1:  *
webmaster@1:  * @param $field
webmaster@1:  *   A field description array, as specified in the schema documentation.
webmaster@1:  */
webmaster@1: function _db_process_field($field) {
webmaster@1: 
webmaster@1:   if (!isset($field['size'])) {
webmaster@1:     $field['size'] = 'normal';
webmaster@1:   }
webmaster@1: 
webmaster@1:   // Set the correct database-engine specific datatype.
webmaster@1:   if (!isset($field['mysql_type'])) {
webmaster@1:     $map = db_type_map();
webmaster@1:     $field['mysql_type'] = $map[$field['type'] .':'. $field['size']];
webmaster@1:   }
webmaster@1: 
webmaster@1:   if ($field['type'] == 'serial') {
webmaster@1:     $field['auto_increment'] = TRUE;
webmaster@1:   }
webmaster@1: 
webmaster@1:   return $field;
webmaster@1: }
webmaster@1: 
webmaster@1: /**
webmaster@1:  * Create an SQL string for a field to be used in table creation or alteration.
webmaster@1:  *
webmaster@1:  * Before passing a field out of a schema definition into this function it has
webmaster@1:  * to be processed by _db_process_field().
webmaster@1:  *
webmaster@1:  * @param $name
webmaster@1:  *    Name of the field.
webmaster@1:  * @param $spec
webmaster@1:  *    The field specification, as per the schema data structure format.
webmaster@1:  */
webmaster@1: function _db_create_field_sql($name, $spec) {
webmaster@1:   $sql = "`". $name ."` ". $spec['mysql_type'];
webmaster@1: 
webmaster@1:   if (isset($spec['length'])) {
webmaster@1:     $sql .= '('. $spec['length'] .')';
webmaster@1:   }
webmaster@1:   elseif (isset($spec['precision']) && isset($spec['scale'])) {
webmaster@1:     $sql .= '('. $spec['precision'] .', '. $spec['scale'] .')';
webmaster@1:   }
webmaster@1: 
webmaster@1:   if (!empty($spec['unsigned'])) {
webmaster@1:     $sql .= ' unsigned';
webmaster@1:   }
webmaster@1: 
webmaster@1:   if (!empty($spec['not null'])) {
webmaster@1:     $sql .= ' NOT NULL';
webmaster@1:   }
webmaster@1: 
webmaster@1:   if (!empty($spec['auto_increment'])) {
webmaster@1:     $sql .= ' auto_increment';
webmaster@1:   }
webmaster@1: 
webmaster@1:   if (isset($spec['default'])) {
webmaster@1:     if (is_string($spec['default'])) {
webmaster@1:       $spec['default'] = "'". $spec['default'] ."'";
webmaster@1:     }
webmaster@1:     $sql .= ' DEFAULT '. $spec['default'];
webmaster@1:   }
webmaster@1: 
webmaster@1:   if (empty($spec['not null']) && !isset($spec['default'])) {
webmaster@1:     $sql .= ' DEFAULT NULL';
webmaster@1:   }
webmaster@1: 
webmaster@1:   return $sql;
webmaster@1: }
webmaster@1: 
webmaster@1: /**
webmaster@1:  * This maps a generic data type in combination with its data size
webmaster@1:  * to the engine-specific data type.
webmaster@1:  */
webmaster@1: function db_type_map() {
webmaster@1:   // Put :normal last so it gets preserved by array_flip.  This makes
webmaster@1:   // it much easier for modules (such as schema.module) to map
webmaster@1:   // database types back into schema types.
webmaster@1:   $map = array(
webmaster@1:     'varchar:normal'  => 'VARCHAR',
webmaster@1:     'char:normal'     => 'CHAR',
webmaster@1: 
webmaster@1:     'text:tiny'       => 'TINYTEXT',
webmaster@1:     'text:small'      => 'TINYTEXT',
webmaster@1:     'text:medium'     => 'MEDIUMTEXT',
webmaster@1:     'text:big'        => 'LONGTEXT',
webmaster@1:     'text:normal'     => 'TEXT',
webmaster@1: 
webmaster@1:     'serial:tiny'     => 'TINYINT',
webmaster@1:     'serial:small'    => 'SMALLINT',
webmaster@1:     'serial:medium'   => 'MEDIUMINT',
webmaster@1:     'serial:big'      => 'BIGINT',
webmaster@1:     'serial:normal'   => 'INT',
webmaster@1: 
webmaster@1:     'int:tiny'        => 'TINYINT',
webmaster@1:     'int:small'       => 'SMALLINT',
webmaster@1:     'int:medium'      => 'MEDIUMINT',
webmaster@1:     'int:big'         => 'BIGINT',
webmaster@1:     'int:normal'      => 'INT',
webmaster@1: 
webmaster@1:     'float:tiny'      => 'FLOAT',
webmaster@1:     'float:small'     => 'FLOAT',
webmaster@1:     'float:medium'    => 'FLOAT',
webmaster@1:     'float:big'       => 'DOUBLE',
webmaster@1:     'float:normal'    => 'FLOAT',
webmaster@1: 
webmaster@1:     'numeric:normal'  => 'DECIMAL',
webmaster@1: 
webmaster@1:     'blob:big'        => 'LONGBLOB',
webmaster@1:     'blob:normal'     => 'BLOB',
webmaster@1: 
webmaster@1:     'datetime:normal' => 'DATETIME',
webmaster@1:   );
webmaster@1:   return $map;
webmaster@1: }
webmaster@1: 
webmaster@1: /**
webmaster@1:  * Rename a table.
webmaster@1:  *
webmaster@1:  * @param $ret
webmaster@1:  *   Array to which query results will be added.
webmaster@1:  * @param $table
webmaster@1:  *   The table to be renamed.
webmaster@1:  * @param $new_name
webmaster@1:  *   The new name for the table.
webmaster@1:  */
webmaster@1: function db_rename_table(&$ret, $table, $new_name) {
webmaster@1:   $ret[] = update_sql('ALTER TABLE {'. $table .'} RENAME TO {'. $new_name .'}');
webmaster@1: }
webmaster@1: 
webmaster@1: /**
webmaster@1:  * Drop a table.
webmaster@1:  *
webmaster@1:  * @param $ret
webmaster@1:  *   Array to which query results will be added.
webmaster@1:  * @param $table
webmaster@1:  *   The table to be dropped.
webmaster@1:  */
webmaster@1: function db_drop_table(&$ret, $table) {
webmaster@1:   $ret[] = update_sql('DROP TABLE {'. $table .'}');
webmaster@1: }
webmaster@1: 
webmaster@1: /**
webmaster@1:  * Add a new field to a table.
webmaster@1:  *
webmaster@1:  * @param $ret
webmaster@1:  *   Array to which query results will be added.
webmaster@1:  * @param $table
webmaster@1:  *   Name of the table to be altered.
webmaster@1:  * @param $field
webmaster@1:  *   Name of the field to be added.
webmaster@1:  * @param $spec
webmaster@1:  *   The field specification array, as taken from a schema definition.
webmaster@1:  *   The specification may also contain the key 'initial', the newly
webmaster@1:  *   created field will be set to the value of the key in all rows.
webmaster@1:  *   This is most useful for creating NOT NULL columns with no default
webmaster@1:  *   value in existing tables.
webmaster@1:  * @param $keys_new
webmaster@1:  *   Optional keys and indexes specification to be created on the
webmaster@1:  *   table along with adding the field. The format is the same as a
webmaster@1:  *   table specification but without the 'fields' element.  If you are
webmaster@1:  *   adding a type 'serial' field, you MUST specify at least one key
webmaster@1:  *   or index including it in this array. @see db_change_field for more
webmaster@1:  *   explanation why.
webmaster@1:  */
webmaster@1: function db_add_field(&$ret, $table, $field, $spec, $keys_new = array()) {
webmaster@1:   $fixnull = FALSE;
webmaster@1:   if (!empty($spec['not null']) && !isset($spec['default'])) {
webmaster@1:     $fixnull = TRUE;
webmaster@1:     $spec['not null'] = FALSE;
webmaster@1:   }
webmaster@1:   $query = 'ALTER TABLE {'. $table .'} ADD ';
webmaster@1:   $query .= _db_create_field_sql($field, _db_process_field($spec));
webmaster@1:   if (count($keys_new)) {
webmaster@1:     $query .= ', ADD '. implode(', ADD ', _db_create_keys_sql($keys_new));
webmaster@1:   }
webmaster@1:   $ret[] = update_sql($query);
webmaster@1:   if (isset($spec['initial'])) {
webmaster@1:     // All this because update_sql does not support %-placeholders.
webmaster@1:     $sql = 'UPDATE {'. $table .'} SET '. $field .' = '. db_type_placeholder($spec['type']);
webmaster@1:     $result = db_query($sql, $spec['initial']);
webmaster@1:     $ret[] = array('success' => $result !== FALSE, 'query' => check_plain($sql .' ('. $spec['initial'] .')'));
webmaster@1:   }
webmaster@1:   if ($fixnull) {
webmaster@1:     $spec['not null'] = TRUE;
webmaster@1:     db_change_field($ret, $table, $field, $field, $spec);
webmaster@1:   }
webmaster@1: }
webmaster@1: 
webmaster@1: /**
webmaster@1:  * Drop a field.
webmaster@1:  *
webmaster@1:  * @param $ret
webmaster@1:  *   Array to which query results will be added.
webmaster@1:  * @param $table
webmaster@1:  *   The table to be altered.
webmaster@1:  * @param $field
webmaster@1:  *   The field to be dropped.
webmaster@1:  */
webmaster@1: function db_drop_field(&$ret, $table, $field) {
webmaster@1:   $ret[] = update_sql('ALTER TABLE {'. $table .'} DROP '. $field);
webmaster@1: }
webmaster@1: 
webmaster@1: /**
webmaster@1:  * Set the default value for a field.
webmaster@1:  *
webmaster@1:  * @param $ret
webmaster@1:  *   Array to which query results will be added.
webmaster@1:  * @param $table
webmaster@1:  *   The table to be altered.
webmaster@1:  * @param $field
webmaster@1:  *   The field to be altered.
webmaster@1:  * @param $default
webmaster@1:  *   Default value to be set. NULL for 'default NULL'.
webmaster@1:  */
webmaster@1: function db_field_set_default(&$ret, $table, $field, $default) {
webmaster@1:   if ($default == NULL) {
webmaster@1:     $default = 'NULL';
webmaster@1:   }
webmaster@1:   else {
webmaster@1:     $default = is_string($default) ? "'$default'" : $default;
webmaster@1:   }
webmaster@1: 
webmaster@1:   $ret[] = update_sql('ALTER TABLE {'. $table .'} ALTER COLUMN '. $field .' SET DEFAULT '. $default);
webmaster@1: }
webmaster@1: 
webmaster@1: /**
webmaster@1:  * Set a field to have no default value.
webmaster@1:  *
webmaster@1:  * @param $ret
webmaster@1:  *   Array to which query results will be added.
webmaster@1:  * @param $table
webmaster@1:  *   The table to be altered.
webmaster@1:  * @param $field
webmaster@1:  *   The field to be altered.
webmaster@1:  */
webmaster@1: function db_field_set_no_default(&$ret, $table, $field) {
webmaster@1:   $ret[] = update_sql('ALTER TABLE {'. $table .'} ALTER COLUMN '. $field .' DROP DEFAULT');
webmaster@1: }
webmaster@1: 
webmaster@1: /**
webmaster@1:  * Add a primary key.
webmaster@1:  *
webmaster@1:  * @param $ret
webmaster@1:  *   Array to which query results will be added.
webmaster@1:  * @param $table
webmaster@1:  *   The table to be altered.
webmaster@1:  * @param $fields
webmaster@1:  *   Fields for the primary key.
webmaster@1:  */
webmaster@1: function db_add_primary_key(&$ret, $table, $fields) {
webmaster@1:   $ret[] = update_sql('ALTER TABLE {'. $table .'} ADD PRIMARY KEY ('.
webmaster@1:     _db_create_key_sql($fields) .')');
webmaster@1: }
webmaster@1: 
webmaster@1: /**
webmaster@1:  * Drop the primary key.
webmaster@1:  *
webmaster@1:  * @param $ret
webmaster@1:  *   Array to which query results will be added.
webmaster@1:  * @param $table
webmaster@1:  *   The table to be altered.
webmaster@1:  */
webmaster@1: function db_drop_primary_key(&$ret, $table) {
webmaster@1:   $ret[] = update_sql('ALTER TABLE {'. $table .'} DROP PRIMARY KEY');
webmaster@1: }
webmaster@1: 
webmaster@1: /**
webmaster@1:  * Add a unique key.
webmaster@1:  *
webmaster@1:  * @param $ret
webmaster@1:  *   Array to which query results will be added.
webmaster@1:  * @param $table
webmaster@1:  *   The table to be altered.
webmaster@1:  * @param $name
webmaster@1:  *   The name of the key.
webmaster@1:  * @param $fields
webmaster@1:  *   An array of field names.
webmaster@1:  */
webmaster@1: function db_add_unique_key(&$ret, $table, $name, $fields) {
webmaster@1:   $ret[] = update_sql('ALTER TABLE {'. $table .'} ADD UNIQUE KEY '.
webmaster@1:     $name .' ('. _db_create_key_sql($fields) .')');
webmaster@1: }
webmaster@1: 
webmaster@1: /**
webmaster@1:  * Drop a unique key.
webmaster@1:  *
webmaster@1:  * @param $ret
webmaster@1:  *   Array to which query results will be added.
webmaster@1:  * @param $table
webmaster@1:  *   The table to be altered.
webmaster@1:  * @param $name
webmaster@1:  *   The name of the key.
webmaster@1:  */
webmaster@1: function db_drop_unique_key(&$ret, $table, $name) {
webmaster@1:   $ret[] = update_sql('ALTER TABLE {'. $table .'} DROP KEY '. $name);
webmaster@1: }
webmaster@1: 
webmaster@1: /**
webmaster@1:  * Add an index.
webmaster@1:  *
webmaster@1:  * @param $ret
webmaster@1:  *   Array to which query results will be added.
webmaster@1:  * @param $table
webmaster@1:  *   The table to be altered.
webmaster@1:  * @param $name
webmaster@1:  *   The name of the index.
webmaster@1:  * @param $fields
webmaster@1:  *   An array of field names.
webmaster@1:  */
webmaster@1: function db_add_index(&$ret, $table, $name, $fields) {
webmaster@1:   $query = 'ALTER TABLE {'. $table .'} ADD INDEX '. $name .' ('. _db_create_key_sql($fields) .')';
webmaster@1:   $ret[] = update_sql($query);
webmaster@1: }
webmaster@1: 
webmaster@1: /**
webmaster@1:  * Drop an index.
webmaster@1:  *
webmaster@1:  * @param $ret
webmaster@1:  *   Array to which query results will be added.
webmaster@1:  * @param $table
webmaster@1:  *   The table to be altered.
webmaster@1:  * @param $name
webmaster@1:  *   The name of the index.
webmaster@1:  */
webmaster@1: function db_drop_index(&$ret, $table, $name) {
webmaster@1:   $ret[] = update_sql('ALTER TABLE {'. $table .'} DROP INDEX '. $name);
webmaster@1: }
webmaster@1: 
webmaster@1: /**
webmaster@1:  * Change a field definition.
webmaster@1:  *
webmaster@1:  * IMPORTANT NOTE: To maintain database portability, you have to explicitly
webmaster@1:  * recreate all indices and primary keys that are using the changed field.
webmaster@1:  *
webmaster@1:  * That means that you have to drop all affected keys and indexes with
webmaster@1:  * db_drop_{primary_key,unique_key,index}() before calling db_change_field().
webmaster@1:  * To recreate the keys and indices, pass the key definitions as the
webmaster@1:  * optional $keys_new argument directly to db_change_field().
webmaster@1:  *
webmaster@1:  * For example, suppose you have:
webmaster@1:  * @code
webmaster@1:  * $schema['foo'] = array(
webmaster@1:  *   'fields' => array(
webmaster@1:  *     'bar' => array('type' => 'int', 'not null' => TRUE)
webmaster@1:  *   ),
webmaster@1:  *   'primary key' => array('bar')
webmaster@1:  * );
webmaster@1:  * @endcode
webmaster@1:  * and you want to change foo.bar to be type serial, leaving it as the
webmaster@1:  * primary key.  The correct sequence is:
webmaster@1:  * @code
webmaster@1:  * db_drop_primary_key($ret, 'foo');
webmaster@1:  * db_change_field($ret, 'foo', 'bar', 'bar',
webmaster@1:  *   array('type' => 'serial', 'not null' => TRUE),
webmaster@1:  *   array('primary key' => array('bar')));
webmaster@1:  * @endcode
webmaster@1:  *
webmaster@1:  * The reasons for this are due to the different database engines:
webmaster@1:  *
webmaster@1:  * On PostgreSQL, changing a field definition involves adding a new field
webmaster@1:  * and dropping an old one which* causes any indices, primary keys and
webmaster@1:  * sequences (from serial-type fields) that use the changed field to be dropped.
webmaster@1:  *
webmaster@1:  * On MySQL, all type 'serial' fields must be part of at least one key
webmaster@1:  * or index as soon as they are created.  You cannot use
webmaster@1:  * db_add_{primary_key,unique_key,index}() for this purpose because
webmaster@1:  * the ALTER TABLE command will fail to add the column without a key
webmaster@1:  * or index specification.  The solution is to use the optional
webmaster@1:  * $keys_new argument to create the key or index at the same time as
webmaster@1:  * field.
webmaster@1:  *
webmaster@1:  * You could use db_add_{primary_key,unique_key,index}() in all cases
webmaster@1:  * unless you are converting a field to be type serial. You can use
webmaster@1:  * the $keys_new argument in all cases.
webmaster@1:  *
webmaster@1:  * @param $ret
webmaster@1:  *   Array to which query results will be added.
webmaster@1:  * @param $table
webmaster@1:  *   Name of the table.
webmaster@1:  * @param $field
webmaster@1:  *   Name of the field to change.
webmaster@1:  * @param $field_new
webmaster@1:  *   New name for the field (set to the same as $field if you don't want to change the name).
webmaster@1:  * @param $spec
webmaster@1:  *   The field specification for the new field.
webmaster@1:  * @param $keys_new
webmaster@1:  *   Optional keys and indexes specification to be created on the
webmaster@1:  *   table along with changing the field. The format is the same as a
webmaster@1:  *   table specification but without the 'fields' element.
webmaster@1:  */
webmaster@1: 
webmaster@1: function db_change_field(&$ret, $table, $field, $field_new, $spec, $keys_new = array()) {
webmaster@1:   $sql = 'ALTER TABLE {'. $table .'} CHANGE '. $field .' '.
webmaster@1:     _db_create_field_sql($field_new, _db_process_field($spec));
webmaster@1:   if (count($keys_new)) {
webmaster@1:     $sql .= ', ADD '. implode(', ADD ', _db_create_keys_sql($keys_new));
webmaster@1:   }
webmaster@1:   $ret[] = update_sql($sql);
webmaster@1: }
webmaster@1: 
webmaster@1: /**
webmaster@1:  * Returns the last insert id.
webmaster@1:  *
webmaster@1:  * @param $table
webmaster@1:  *   The name of the table you inserted into.
webmaster@1:  * @param $field
webmaster@1:  *   The name of the autoincrement field.
webmaster@1:  */
webmaster@1: function db_last_insert_id($table, $field) {
webmaster@1:   return db_result(db_query('SELECT LAST_INSERT_ID()'));
webmaster@1: }