1 files changed, 82 insertions, 0 deletions
diff --git a/includes/database/mysql/database.inc b/includes/database/mysql/database.inc
new file mode 100644
index 000000000..feac5da1f
--- /dev/null
+++ b/includes/database/mysql/database.inc
@@ -0,0 +1,82 @@
+<?php
+// $Id$
+
+/**
+ * @file
+ * Database interface code for MySQL database servers.
+ */
+
+/**
+ * @ingroup database
+ * @{
+ */
+
+class DatabaseConnection_mysql extends DatabaseConnection {
+
+  protected $transactionSupport;
+
+  public function __construct(Array $connection_options = array()) {
+
+    $connection_options += array(
+      'transactions' => FALSE,
+      'port' => 3306,
+    );
+    $this->transactionSupport = $connection_options['transactions'];
+
+    $dsn = 'mysql:host=' . $connection_options['host'] . ';port=' . $connection_options['port'] . ';dbname=' . $connection_options['database'];
+    parent::__construct($dsn, $connection_options['username'], $connection_options['password'], array(
+      // So we don't have to mess around with cursors and unbuffered queries by default.
+      PDO::MYSQL_ATTR_USE_BUFFERED_QUERY => TRUE,
+      // Because MySQL's prepared statements skip the query cache, because it's dumb.
+      PDO::ATTR_EMULATE_PREPARES => TRUE,
+    ));
+  }
+
+  public function queryRange($query, Array $args, $from, $count, Array $options) {
+    // Backward compatibility hack, temporary.
+    $query = str_replace(array('%d' , '%f' , '%b' , "'%s'"), '?', $query);
+
+    return $this->query($query . ' LIMIT ' . $from . ', ' . $count, $args, $options);
+  }
+
+  public function queryTemporary($query, Array $args, $tablename) {
+    $query = preg_replace('/^SELECT/i', 'CREATE TEMPORARY TABLE ' . $tablename . ' Engine=HEAP SELECT', $this->prefixTables($query));
+
+    return $this->query($query, $args, $options);
+  }
+
+  public function driver() {
+    return 'mysql';
+  }
+
+  public function databaseType() {
+    return 'mysql';
+  }
+
+  public function supportsTransactions() {
+    return $this->transactionSupport;
+  }
+
+  public function escapeTable($table) {
+    return preg_replace('/[^A-Za-z0-9_]+/', '', $table);
+  }
+
+  public function mapConditionOperator($operator) {
+    // We don't want to override any of the defaults.
+    return NULL;
+  }
+
+  /**
+   * @todo Remove this as soon as db_rewrite_sql() has been exterminated.
+   */
+  public function distinctField($table, $field, $query) {
+    $field_to_select = 'DISTINCT(' . $table . '.' . $field . ')';
+    // (?<!text) is a negative look-behind (no need to rewrite queries that already use DISTINCT).
+    return preg_replace('/(SELECT.*)(?:' . $table . '\.|\s)(?<!DISTINCT\()(?<!DISTINCT\(' . $table . '\.)' . $field . '(.*FROM )/AUsi', '\1 ' . $field_to_select . '\2', $query);
+  }
+}
+
+
+/**
+ * @} End of "ingroup database".
+ */