MDL-67394 dml: improve thrown exception when Oracle can't parse query.

lang/en/error.php

@@ -221,6 +221,7 @@
 $string['destinationcmnotexit'] = 'The destination course module does not exist';
 $string['detectedbrokenplugin'] = 'Plugin "{$a}" is defective or outdated, can not continue, sorry.';
 $string['dmlexceptiononinstall'] = '<p>A database error has occurred [{$a->errorcode}].<br />{$a->debuginfo}</p>';
+$string['dmlparseexception'] = 'Error parsing SQL query';
 $string['dmlreadexception'] = 'Error reading from database';
 $string['dmltransactionexception'] = 'Database transaction error';
 $string['dmlwriteexception'] = 'Error writing to database';

lib/dml/oci_native_moodle_database.php

@@ -345,14 +345,16 @@ public function get_last_error() {
 
     /**
      * Prepare the statement for execution
-     * @throws dml_connection_exception
+     *
      * @param string $sql
      * @return resource
+     *
+     * @throws dml_exception
      */
     protected function parse_query($sql) {
         $stmt = oci_parse($this->oci, $sql);
         if ($stmt == false) {
-            throw new dml_connection_exception('Can not parse sql query'); //TODO: maybe add better info
+            throw new dml_exception('dmlparseexception', null, $this->get_last_error());
         }
         return $stmt;
     }