Changeset 16266 for trunk/wp-includes/meta.php

Timestamp:

11/09/2010 11:22:13 PM (14 years ago)

Author:

scribu

Message:

Make get_meta_sql() a standalone function. See #15032

File:

• trunk/wp-includes/meta.php (modified) (1 diff)

trunk/wp-includes/meta.php

@@ -352 +352 @@
 }
 
+/*
+ * Given a meta query, generates SQL clauses to be appended to a main query
+ *
+ * @since 3.1.0
+ *
+ * @param array $meta_query List of metadata queries. A single query is an associative array:
+ * - 'key' string The meta key
+ * - 'value' string|array The meta value
+ * - 'compare' (optional) string How to compare the key to the value.
+ *      Possible values: '=', '!=', '>', '>=', '<', '<=', 'LIKE', 'NOT LIKE', 'IN', 'NOT IN', 'BETWEEN', 'NOT BETWEEN'.
+ *      Default: '='
+ * - 'type' string (optional) The type of the value.
+ *      Possible values: 'NUMERIC', 'BINARY', 'CHAR', 'DATE', 'DATETIME', 'DECIMAL', 'SIGNED', 'TIME', 'UNSIGNED'.
+ *      Default: 'CHAR'
+ *
+ * @param string $meta_type
+ * @param string $primary_table
+ * @param string $primary_id_column
+ * @return array( 'join' => $join_sql, 'where' => $where_sql )
+ */
+function get_meta_sql( $meta_query, $meta_type, $primary_table, $primary_id_column ) {
+    global $wpdb;
+
+    if ( ! $meta_table = _get_meta_table( $meta_type ) )
+        return false;
+
+    $meta_id_column = esc_sql( $meta_type . '_id' );
+
+    $clauses = array();
+
+    $join = '';
+    $where = '';
+    $i = 0;
+    foreach ( $meta_query as $q ) {
+        $meta_key = isset( $q['key'] ) ? trim( $q['key'] ) : '';
+        $meta_value = isset( $q['value'] ) ? $q['value'] : '';
+        $meta_compare = isset( $q['compare'] ) ? strtoupper( $q['compare'] ) : '=';
+        $meta_type = isset( $q['type'] ) ? strtoupper( $q['type'] ) : 'CHAR';
+
+        if ( ! in_array( $meta_compare, array( '=', '!=', '>', '>=', '<', '<=', 'LIKE', 'NOT LIKE', 'IN', 'NOT IN', 'BETWEEN', 'NOT BETWEEN' ) ) )
+            $meta_compare = '=';
+
+        if ( 'NUMERIC' == $meta_type )
+            $meta_type = 'SIGNED';
+        elseif ( ! in_array( $meta_type, array( 'BINARY', 'CHAR', 'DATE', 'DATETIME', 'DECIMAL', 'SIGNED', 'TIME', 'UNSIGNED' ) ) )
+            $meta_type = 'CHAR';
+
+        if ( empty( $meta_key ) && empty( $meta_value ) )
+            continue;
+
+        $alias = $i ? 'mt' . $i : $meta_table;
+
+        $join .= "\nINNER JOIN $meta_table";
+        $join .= $i ? " AS $alias" : '';
+        $join .= " ON ($primary_table.$primary_id_column = $alias.$meta_id_column)";
+
+        $i++;
+
+        if ( !empty( $meta_key ) )
+            $where .= $wpdb->prepare( " AND $alias.meta_key = %s", $meta_key );
+
+        if ( in_array( $meta_compare, array( 'IN', 'NOT IN', 'BETWEEN', 'NOT BETWEEN' ) ) ) {
+            if ( ! is_array( $meta_value ) )
+                $meta_value = preg_split( '/[,\s]+/', $meta_value );
+        } else {
+            $meta_value = trim( $meta_value );
+        }
+
+        if ( empty( $meta_value ) )
+            continue;
+
+        if ( 'IN' == substr( $meta_compare, -2) ) {
+            $meta_field_types = substr( str_repeat( ',%s', count( $meta_value ) ), 1 );
+            $meta_compare_string = "($meta_field_types)";
+            unset( $meta_field_types );
+        } elseif ( 'BETWEEN' == substr( $meta_compare, -7) ) {
+            $meta_value = array_slice( $meta_value, 0, 2 );
+            $meta_compare_string = '%s AND %s';
+        } elseif ( 'LIKE' == substr( $meta_compare, -4 ) ) {
+            $meta_value = '%' . like_escape( $meta_value ) . '%';
+            $meta_compare_string = '%s';
+        } else {
+            $meta_compare_string = '%s';
+        }
+        $where .= $wpdb->prepare( " AND CAST($alias.meta_value AS {$meta_type}) {$meta_compare} {$meta_compare_string}", $meta_value );
+
+        unset( $meta_compare_string );
+    }
+
+    return apply_filters( 'get_meta_sql', compact( 'join', 'where' ), $meta_query, $meta_type, $primary_table, $primary_id_column );
+}
+
 /**
  * Retrieve the name of the metadata table for the specified object type.