public function exec($sql) {
        $dialect = $this->dialect;
        if (is_null($dialect)) {
            return false;
        }
        try {
            // 表前缀处理
            $sql = preg_replace_callback('#\{[a-z][a-z0-9_].*\}#i', function ($r) use ($dialect) {
                return $dialect->getTableName($r[0]);
            }, $sql);

            return false !== $dialect->exec($sql);
        } catch (\Exception $e) {
            $this->error = $e->getMessage();

            return false;
        }
    }
public function exec($sql) {
        $dialect = $this->dialect;
        if (is_null($dialect)) {
            return false;
        }
        try {
            // 表前缀处理
            $sql = preg_replace_callback('#\{[a-z][a-z0-9_].*\}#i', function ($r) use ($dialect) {
                return $dialect->getTableName($r[0]);
            }, $sql);

            return false !== $dialect->exec($sql);
        } catch (\Exception $e) {
            $this->error = $e->getMessage();

            return false;
        }
    }
public function exec ( $ sql ) { $ dialect = $ this -> dialect ; if ( is_null ( $ dialect ) ) { return false ; } try { // 表前缀处理 $ sql = preg_replace_callback ( '#\{[a-z][a-z0-9_].*\}#i' , function ( $ r ) use ( $ dialect ) { return $ dialect -> getTableName ( $ r [ 0 ] ) ; } , $ sql ) ; return false !== $ dialect -> exec ( $ sql ) ; } catch ( \ Exception $ e ) { $ this -> error = $ e -> getMessage ( ) ; return false ; } }
execute a ddl SQL.

@param string $sql

@return bool
execute a ddl SQL .