diff --git a/framework/yii/db/oci/QueryBuilder.php b/framework/yii/db/oci/QueryBuilder.php
new file mode 100644
index 0000000..3ee27f1
--- /dev/null
+++ b/framework/yii/db/oci/QueryBuilder.php
@@ -0,0 +1,75 @@
+<?php
+
+namespace yii\db\oci;
+
+use yii\db\Exception;
+use yii\base\InvalidParamException;
+
+/**
+ * QueryBuilder is the query builder for MySQL databases.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @since 2.0
+ */
+class QueryBuilder extends \yii\db\QueryBuilder {
+	
+	private $sql;
+
+	public function build($query) {
+		//var_dump($query);exit;
+		$params = $query->params;
+		$clauses = [
+			$this->buildSelect($query->select, $query->distinct, $query->selectOption),
+			$this->buildFrom($query->from),
+			$this->buildJoin($query->join, $params),
+			$this->buildWhere($query->where, $params),
+			$this->buildGroupBy($query->groupBy),
+			$this->buildHaving($query->having, $params),
+			$this->buildUnion($query->union, $params),
+			$this->buildOrderBy($query->orderBy),
+			//$this->buildLimit($query->limit, $query->offset),
+		];
+		//var_dump( [implode($this->separator, array_filter($clauses)), $params]);exit;
+		$this->sql = implode($this->separator, array_filter($clauses));
+		
+		if (!is_null($query->limit) && !is_null($query->offset)) {
+			$this->sql = $this->buildLimit($query->limit, $query->offset);
+		}
+		return [$this->sql, $params];
+		//return [implode($this->separator, array_filter($clauses)), $params];
+	}
+
+	public function buildLimit($limit, $offset) {
+		//var_dump($limit >= 0);
+		//var_dump($offset);exit;
+		//var_dump($limit, $offset);
+		if (($limit < 0) && ($offset < 0)) {
+			return $this->sql;
+		}
+		$filters = array();
+		if ($offset > 0) {
+			$filters[] = 'rowNumId > ' . (int) $offset;
+		}
+
+		if ($limit >= 0) {
+			$filters[] = 'rownum <= ' . (int) $limit;
+		}
+
+		if (count($filters) > 0) {
+			$filter = implode(' and ', $filters);
+			$filter = " WHERE " . $filter;
+		} else {
+			$filter = '';
+		}
+
+		$sql = <<<EOD
+WITH USER_SQL AS ({$this->sql}),
+	PAGINATION AS (SELECT USER_SQL.*, rownum as rowNumId FROM USER_SQL)
+SELECT *
+FROM PAGINATION
+{$filter}
+EOD;
+		return $sql;
+	}
+
+}