function _db_rewrite_sql in Drupal 4

Same name and namespace in other branches

1. 5 includes/database.inc \_db_rewrite_sql()
2. 6 includes/database.inc \_db_rewrite_sql()

Helper function for db_rewrite_sql.

Collects JOIN and WHERE statements via hook_db_rewrite_sql() Decides whether to select primary_key or DISTINCT(primary_key)

Parameters

$query: Query to be rewritten.

$primary_table: Name or alias of the table which has the primary key field for this query. Possible values are: comments, forum, node, menu, term_data, vocabulary.

$primary_field: Name of the primary field.

$args: Array of additional arguments.

Return value

An array: join statements, where statements, field or DISTINCT(field).

Related topics

2 calls to _db_rewrite_sql()

db_rewrite_sql in includes/database.inc

Rewrites node, taxonomy and comment queries. Use it for listing queries. Do not use FROM table1, table2 syntax, use JOIN instead.

node_search in modules/node.module

Implementation of hook_search().

File

includes/database.inc, line 234

Wrapper for database interface code.

Code

function _db_rewrite_sql($query = '', $primary_table = 'n', $primary_field = 'nid', $args = array()) {
  $where = array();
  $join = array();
  $distinct = FALSE;
  foreach (module_implements('db_rewrite_sql') as $module) {
    $result = module_invoke($module, 'db_rewrite_sql', $query, $primary_table, $primary_field, $args);
    if (isset($result) && is_array($result)) {
      if (isset($result['where'])) {
        $where[] = $result['where'];
      }
      if (isset($result['join'])) {
        $join[] = $result['join'];
      }
      if (isset($result['distinct']) && $result['distinct']) {
        $distinct = TRUE;
      }
    }
    elseif (isset($result)) {
      $where[] = $result;
    }
  }
  $where = empty($where) ? '' : '(' . implode(') AND (', $where) . ')';
  $join = empty($join) ? '' : implode(' ', $join);
  return array(
    $join,
    $where,
    $distinct,
  );
}