Use the native set_charset() method if available instead of SET NAMES

According to the PHP manual, it is the recommended way to set the charset.

- mysql extension has it for MySQL >= 5.0.7
- mysqli extension has it for MySQL >= 5.0.6
or if using mysqlnd.

Change-Id: I8cd2f97fcad4b045c6f99ff894254847b13c6878

includes/db/DatabaseMysql.php

@@ -80,6 +80,17 @@ class DatabaseMysql extends DatabaseMysqlBase {
 		return $conn;
 	}
 
+	/**
+	 * @return bool
+	 */
+	protected function mysqlSetCharset( $charset ) {
+		if ( function_exists( 'mysql_set_charset' ) ) {
+			return mysql_set_charset( $charset, $this->mConn );
+		} else {
+			return $this->query( 'SET NAMES ' . $charset, __METHOD__ );
+		}
+	}
+
 	/**
 	 * @return bool
 	 */

includes/db/DatabaseMysqlBase.php

@@ -114,9 +114,9 @@ abstract class DatabaseMysqlBase extends DatabaseBase {
 		// Tell the server we're communicating with it in UTF-8.
 		// This may engage various charset conversions.
 		if ( $wgDBmysql5 ) {
-			$this->query( 'SET NAMES utf8', __METHOD__ );
+			$this->mysqlSetCharset( 'utf8' );
 		} else {
-			$this->query( 'SET NAMES binary', __METHOD__ );
+			$this->mysqlSetCharset( 'binary' );
 		}
 		// Set SQL mode, default is turning them all off, can be overridden or skipped with null
 		if ( is_string( $wgSQLMode ) ) {
@@ -138,6 +138,14 @@ abstract class DatabaseMysqlBase extends DatabaseBase {
 	 */
 	abstract protected function mysqlConnect( $realServer );
 
+	/**
+	 * Set the character set of the MySQL link
+	 *
+	 * @param string $charset
+	 * @return bool
+	 */
+	abstract protected function mysqlSetCharset( $charset );
+
 	/**
 	 * @param $res ResultWrapper
 	 * @throws DBUnexpectedError

includes/db/DatabaseMysqli.php

@@ -79,6 +79,17 @@ class DatabaseMysqli extends DatabaseMysqlBase {
 		return false;
 	}
 
+	/**
+	 * @return bool
+	 */
+	protected function mysqlSetCharset( $charset ) {
+		if ( method_exists( $this->mConn, 'set_charset' ) ) {
+			return $this->mConn->set_charset( $charset );
+		} else {
+			return $this->query( 'SET NAMES ' . $charset, __METHOD__ );
+		}
+	}
+
 	/**
 	 * @return bool
 	 */

tests/phpunit/includes/db/DatabaseMysqlBaseTest.php

@@ -37,6 +37,7 @@ class FakeDatabaseMysqlBase extends DatabaseMysqlBase {
 
 	// From DatabaseMysql
 	protected function mysqlConnect( $realServer ) {}
+	protected function mysqlSetCharset( $charset ) {}
 	protected function mysqlFreeResult( $res ) {}
 	protected function mysqlFetchObject( $res ) {}
 	protected function mysqlFetchArray( $res ) {}