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Add NOT EXISTS to meta queries, allowing you to query for the non-existence of a meta key. 

You could already use EXISTS by omitting a value to check.

props georgestephanis, scribu
fixes #18158



git-svn-id: http://core.svn.wordpress.org/trunk@21185 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This commit is contained in:
nacin 2012-06-29 19:59:29 +00:00
parent 34c74ee8ce
commit aebd57c588
1 changed files with 27 additions and 11 deletions
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38
wp-includes/meta.php
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@ -720,10 +720,35 @@ class WP_Meta_Query {
elseif ( ! in_array( $meta_type, array( 'BINARY', 'CHAR', 'DATE', 'DATETIME', 'DECIMAL', 'SIGNED', 'TIME', 'UNSIGNED' ) ) )
$meta_type = 'CHAR';
$meta_value = isset( $q['value'] ) ? $q['value'] : null;
if ( isset( $q['compare'] ) )
$meta_compare = strtoupper( $q['compare'] );
else
$meta_compare = is_array( $meta_value ) ? 'IN' : '=';
if ( ! in_array( $meta_compare, array(
'=', '!=', '>', '>=', '<', '<=',
'LIKE', 'NOT LIKE',
'IN', 'NOT IN',
'BETWEEN', 'NOT BETWEEN',
'NOT EXISTS'
) ) )
$meta_compare = '=';
$i = count( $join );
$alias = $i ? 'mt' . $i : $meta_table;
// Set JOIN
if ( 'NOT EXISTS' == $meta_compare ) {
$join[$i] = "LEFT JOIN $meta_table";
$join[$i] .= $i ? " AS $alias" : '';
$join[$i] .= " ON ($primary_table.$primary_id_column = $alias.$meta_id_column AND $alias.meta_key = '$meta_key')";
$where[$k] = ' ' . $alias . '.' . $meta_id_column . ' IS NULL';
continue;
}
$join[$i] = "INNER JOIN $meta_table";
$join[$i] .= $i ? " AS $alias" : '';
$join[$i] .= " ON ($primary_table.$primary_id_column = $alias.$meta_id_column)";
@ -732,21 +757,12 @@ class WP_Meta_Query {
if ( !empty( $meta_key ) )
$where[$k] = $wpdb->prepare( "$alias.meta_key = %s", $meta_key );
if ( !isset( $q['value'] ) ) {
if ( is_null( $meta_value ) ) {
if ( empty( $where[$k] ) )
unset( $join[$i] );
continue;
}
$meta_value = $q['value'];
$meta_compare = is_array( $meta_value ) ? 'IN' : '=';
if ( isset( $q['compare'] ) )
$meta_compare = strtoupper( $q['compare'] );
if ( ! in_array( $meta_compare, array( '=', '!=', '>', '>=', '<', '<=', 'LIKE', 'NOT LIKE', 'IN', 'NOT IN', 'BETWEEN', 'NOT BETWEEN' ) ) )
$meta_compare = '=';
if ( in_array( $meta_compare, array( 'IN', 'NOT IN', 'BETWEEN', 'NOT BETWEEN' ) ) ) {
if ( ! is_array( $meta_value ) )
$meta_value = preg_split( '/[,\s]+/', $meta_value );