db_rewrite_sql
Definition
db_rewrite_sql($query, $primary_table = 'n', $primary_field = 'nid', $args = array())
drupal/includes/database.inc, line 277
Description
Rewrites node, taxonomy and comment queries. Use it for listing queries. Do not use FROM table1, table2 syntax, use JOIN instead.
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.
$args An array of arguments, passed to the implementations of hook_db_rewrite_sql.
Return value
The original query with JOIN and WHERE statements inserted from hook_db_rewrite_sql implementations. nid is rewritten if needed.
Related topics
Name | Description |
|---|---|
| Database abstraction layer | Allow the use of different database servers using the same code base. |
Code
function db_rewrite_sql($query, $primary_table = 'n', $primary_field = 'nid', $args = array()) {
list($join, $where, $distinct) = _db_rewrite_sql($query, $primary_table, $primary_field, $args);
if ($distinct) {
$query = db_distinct_field($primary_table, $primary_field, $query);
}
if (!empty($where) || !empty($join)) {
if (!empty($where)) {
$new = "WHERE $where ";
}
$new = " $join $new";
if (strpos($query, 'WHERE')) {
$query = str_replace('WHERE', $new .'AND (', $query);
$insert = ') ';
}
else {
$insert = $new;
}
if (strpos($query, 'GROUP')) {
$replace = 'GROUP';
}
elseif (strpos($query, 'ORDER')) {
$replace = 'ORDER';
}
elseif (strpos($query, 'LIMIT')) {
$replace = 'LIMIT';
}
else {
$query .= $insert;
}
if (isset($replace)) {
$query = str_replace($replace, $insert . $replace, $query);
}
}
return $query;
}