One Approch to DDL abstraction.

2007, March 28 - 10:18pm — dopry

I've been playing with DDL abstraction for Drupal. My current idea is to mimic the SQL-92 syntactical structure as an array. I'm working on the assumption that the generic SQL-92 clause ordering is consistent it is only the clauses themselves that need to be translated. I am going to assume that we use mysql datatypes by default so the values in the data definition array will be familar to mysql users.

Eventually I would like to expand this to support relationships and database introspection.

Notes from database.inc

<?php
/**
 * Map Data Definition array attributes into sql phrases.
 *
 * This function recieves a column array definition and maps its attributes
 * in small sql phrases.
 *
 * The data type definitions from ANSI SQL-92[1] section 6.1
 *
 * they are generally phrases in the form of
 *   type[([<precision>, <size>, <scale>])] [CHARACTER SET <character set>]
 *
 * There is also a VARYING statement which we will not implement in the first iteration
 * of the DDL mapping.
 *
 * ==The column definitions from ANSI-SQL92[1] section 11.4
 *   <column definition> ::=
 *            <column name> { <data type> | <domain name> }
 *            [ <default clause> ]
 *            [ <column constraint definition>... ]
 *            [ <collate clause> ]
 *
 *   The representative Drupal DDL column array is.
 *
*   $column => array(
 *      'name' => 'id',
 *      'default' => '0'
 *      'collate' => '',
 *      'type' => array(
 *        'type' => 'int'  // BEGIN <data type>
 *        'size' => '4',
 *        'scale' => ''
 *        'precision' => ''
 *        'character set' => ''  // END <data type>
 *      ),
 *      'constraints' => array(
 *        'not null' => TRUE,    // BEGIN <constraint definition> ...
 *        'unique' => 'false',
 *        'primary key' => 'TRUE'
 *      ),
 *   );
 *
 *   The representative Drupal SQL phrase array is.
 *   $mapped_column => array(
 *     'name' => '{id}',  // <column name>
 *     'type' => 'INT(4)
 *     'default' => 'DEFAULT 0', // <default clause>
 *     'constraints' => 'NOT NULL PRIMARY KEY', <column constraint definition>
 *     'collate' => '' // <collate clause>
 *   );
 *
 * * ==The table definitions from ANSI SQL-92[1] section 11.3
 *
 * CREATE [ { GLOBAL | LOCAL } TEMPORARY ] TABLE <table name>
 *              <table element list>
 *              [ ON COMMIT { DELETE | PRESERVE } ROWS ]
 *
 *
 *   The representative Drupal DDL table array is.
 *
 *   $table = array(
 *      'name' => 'mytable',
 *      'type' => ''
 *      'columns' => array($column, ...),
 *      'on commit' => '',
 *   );
 *
 *   $table = array(
 *     'name' => '{mytable}',
 *     'type' => ''
 *     'columns' => array('$mapped_column, ...) , // see above.
 *     'indexes' => 'TBD'
 *     'on commit' => ''
 *   );
 *
 *
 * [1] http://www.contrib.andrew.cmu.edu/~shadow/sql/sql1992.txt
 *
 * @todo: abstract more of this to the database.engine.inc files.
 *
 */

function _db_map_column($column) {
  $mapped_column = array();
  $mapped_column['type'] = _db_map_column_type($column);
  $mapped_column['constraints'] = _db_map_column_constraints($column);
  $mapped_column['default'] = _db_map_column_default($column);
  $mapped_column['collate'] = _db_map_column_default($column);
  return $mapped_column;
}

/**
 * Map column types for different database types
 * @param columns
 *   array of column definitions
 *
 * @return array of database specific
 *
 */
function _db_map_columns($columns) {
  foreach ($columns as $index => $column) {
    $columns[$index] = _db_map_column($column);
  }
  return $columns;
}
/*
 * Create a database table based on Drupal Table Definition.
 */
function db_create_table($table) {
  $mapped_table = _db_map_table($table);
  $mapped_columns = _db_map_columns($table['columns']);
  foreach ($mapped_columns as $column) {
    $columns[] =  $column['name'] .' '. $column['type'] .' '. $column['not_null'] .' '. $column['default'];
  }
  foreach($tables['indexes'] as $index) {
    // @todo: mapping index definitions.
    $indexes[] = '';
  }
  $sql = 'CREATE TABLE {'. $table['name'] .'} ('. implode($columns, ',') .')'  . implode(',', $indexes);
  db_query($sql);
}
?>

Notes from database.mysql.inc:

<?php
/**
 * Translate DDL column types into engine specific
 * data type clauses.
 *
 * @param $type
 *   array(
 *    'type' => 'DDL Type',
 *    'precision' => '',
 *    'size' => '',
 *    'scale' = '',
 *    'character set' => '',
 *    'unsigned' => BOOL,
 *  )
 *
 *  @return string.
 */

function _db_map_column_type($type) {
  $output =  $type['type'] .'('. $type['size'] .')';
  if (isset($type['unsigned'] && $type['unsigned'])) {
    $output .= ' UNSIGNED';
  }
  return $output;
}
/**
 * Translate DDL column constraints into engine specific
 * constriant clauses.
 *
 * @param array $constraint
 *   array(
 *    'not null' => BOOL,
 *    'unique' => BOOL,
 *    'primary key' => BOOL,
 *  )
 *
 *  @return string
 */

function _db_map_column_constraints($constraints) {
  $elements = array();
  if (array_key_exists('not null', $constraints) && $constraints['not null']) {
    $elements[] = 'NOT NULL';
  }
  if (array_key_exists('primary key', $constraints) && $constraints['primary key']) {
    $elements[] = 'PRIMARY KEY';
  }
  elseif (array_key_exists('unique', $constraints) && $constraints['unique']) {
    $elements[] = 'UNIQUE';
  }
  return implode(' ', $elements);
}

/**
 * Translate DDL column default value into engine specific
 * default clause.
 *
 * @param mixed $default
 *   default value for the column.
 *
 * @return string
 */
function _db_map_column_default($column) {
  $default = '';
  if (array_key_exists('default', $column['default']) && !in_array($column['type']['type'], array('text', 'mediumtext'

    if (is_null($column['default'])) {
      $default = 'default NULL';
    }
    else if (!$column['default'] === FALSE) {
      $default = 'default '. $column['default'];
    }
  }
  return $default;
}

/**
 * Translate DDL column collation default value into engine specific
 * collation clause.
 *
 * @param mixed $collation
 *   default collation for the column.
 *
 * @return string
 */

function _db_map_column_collation($column) {
  // I don't think mysql supports column collation.
  return '';
}
/**
 * Add a column to a mysql table.
 *
 * @param string table_name
 * @param mapped ddl column array
 */

function _db_add_column($table_name, $mapped_column) {
  return db_query('ALTER TABLE {'. $table_name .'} ADD COLUMN '. $mapped_column['name'] .' '. $mapped_column['type'] .
}
?>

Comments

2007, March 29 - 7:50pm — bjaspan

Gathering momentum

Hi Darrel, we met at OSCMS last week. I am also working on these ideas; see my article at http://jaspan.com/schema-project-database-abstraction-reflection-and-mig....

Since writing it, I've changed the array structure; it is now based on (okay, ripped off from) CCK's "database columns" format. My code already supports database introspection and verifies the combined schema DDL from all modules that implemenmt hook_schema against the live database, reporting missing or inconsistent tables. I also can construct MySQL CREATE TABLE statements from the schema structure. Since I have introspection, it is trivial for me to construct the schema array for all system tables automatically, so I have. Creating it for CCK types should be easy too.

I also see a very short and easy path to using the schema structure to be able to load all fields of a node (including CCK nodes, possibly even with multiples) in a single SQL query from within node_load. This will cut storage requirements by eliminating the need for CCK's fields cache table and reduce the number of queries by at least one (no field cache load) for every node load.

So, we need to talk. :-)

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This will cut storage

This will cut storage requirements by eliminating the need for CCK's fields cache table and reduce the number of queries by at least one (no field cache load) for every node load.
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My code already supports database introspection and verifies the combined schema DDL from all modules that implemenmt hook_schema against the live database, reporting missing or inconsistent tables. I also can construct MySQL CREATE TABLE statements from the schema structure. Since I have introspection, it is trivial for me to construct the schema array for all system tables automatically, so I have. Creating it for CCK types should be easy too.
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