+ /**
+ * Column names from the foreign table can be resolved with a call to getTableColumnNames()
+ * @param <type> $table
+ * @return array array of rows with keys: fkey_name, table_name, table_id, col_names (array of strings)
+ */
+ function getForeignKeyInfo($table, $constraint_name)
+ {
+ // In a sane world, it'd be easier to query the column names directly.
+ // But it's pretty hard to work with arrays such as col_indexes in direct SQL here.
+ $query = 'SELECT ' .
+ '(SELECT relname FROM pg_class WHERE oid=confrelid) AS table_name, ' .
+ 'confrelid AS table_id, ' .
+ '(SELECT indkey FROM pg_index WHERE indexrelid=conindid) AS col_indexes ' .
+ 'FROM pg_constraint ' .
+ 'WHERE conrelid=(SELECT oid FROM pg_class WHERE relname=\'%s\') ' .
+ 'AND conname=\'%s\' ' .
+ 'AND contype=\'f\'';
+ $sql = sprintf($query, $table, $constraint_name);
+ $data = $this->fetchQueryData($sql);
+ if (count($data) < 1) {
+ throw new Exception("Could not find foreign key " . $constraint_name . " on table " . $table);