diff --git a/db/db.go b/db/db.go
index 5030b48..a000841 100644
--- a/db/db.go
+++ b/db/db.go
@@ -36,10 +36,16 @@ func (s *SqlBuilder[T]) Clear() {
 	s.Opts = Options{}
 }
 
-func (s *SqlBuilder[T]) SetSchema(schema string) {
+func (s *SqlBuilder[T]) SetSchema(schema string) error {
 	if s.Driver == util.DriverOracle {
-		tyoracle.DB().Exec(fmt.Sprintf("ALTER SESSION SET CURRENT_SCHEMA = %s", schema), nil)
+		err := tyoracle.DB().DDL(fmt.Sprintf("ALTER SESSION SET CURRENT_SCHEMA = %s", schema))
+		if err != nil {
+			return err
+		}
+	} else {
+		return fmt.Errorf("only support oracle")
 	}
+	return nil
 }
 
 func (s *SqlBuilder[T]) SetDriver(driver string) {
diff --git a/main_test.go b/main_test.go
index 84bbb57..31a2c58 100644
--- a/main_test.go
+++ b/main_test.go
@@ -48,7 +48,29 @@ func (p *Page) SetPageSize(pageSize int) {
 	p.PageSize = pageSize
 }
 
-func TestMain(m *testing.M) {
+func TestOracle(t *testing.T) {
+	var err error
+	type Employye struct {
+		EmployeeId int    `json:"employee_id"`
+		FirstName  string `json:"first_name"`
+		LastName   string `json:"last_name"`
+		Email      string `json:"email"`
+		Rn         int
+	}
+	var data []Employye
+	sqlb := OracleSqlBuilder()
+	err = sqlb.SetSchema("HR")
+	fmt.Println(err)
+	sqls := `select employee_id,first_name,last_name,email from employees`
+	sqlb.Sql = sqls
+	page := Page{PageIndex: 1, PageSize: 10}
+	err = sqlb.PaginateBySql(&data, &page)
+	page.Data = &data
+	fmt.Println(err, page.Data)
+}
+
+func TestMysql(t *testing.T) {
+	var err error
 	type PreliminaryProcedureResponse struct {
 		ProjectId      int       `json:"project_id"`
 		InitiationTime time.Time `json:"initiation_time" export:"x:1,y:2"`
@@ -62,40 +84,29 @@ func TestMain(m *testing.M) {
 		HandlingNum    int       `json:"handling_num" export:"x:9,y:2"`
 		HandledNum     int       `json:"handled_num" export:"x:10,y:2"`
 	}
-	type Employye struct {
-		EmployeeId int    `json:"employee_id"`
-		FirstName  string `json:"first_name"`
-		LastName   string `json:"last_name"`
-		Email      string `json:"email"`
-		Rn         int
+	var data []PreliminaryProcedureResponse
+	company_id := 1
+	sqlb := DefaultSqlBuilder()
+	sqls := `select t1.autoseq,max(t1.establishment_time),max(t1.number),max(t1.name),max(t2.name) as project_unit,max(t3.name) as project_type,
+		count(distinct t6.autoseq) all_num,
+		count(distinct case t6.state when 1 then t6.autoseq end) not_handle_num,
+		count(distinct case t6.state when 2 then t6.autoseq end) no_handle_num,
+		count(distinct case t6.state when 3 then t6.autoseq end) handling_num,
+		count(distinct case t6.state when 4 then t6.autoseq end) handled_num
+		from tproject_info t1
+		inner join tcompany t2 on t1.investor_id = t2.autoseq and t2.del = 0 @c
+		left join tinvestment_type t3 on t1.industry_category_id = t3.autoseq and t3.del = 0
+		left join tpreliminary_procedures t6 on t1.autoseq = t6.project_id
+		where t1.del = 0 @c @c @c @c @c1
+		@g`
+	sqlb.SetSql(sqls)
+	if company_id != 0 {
+		sqlb.InsertConditions("@c1", "t2.autoseq = ?", company_id)
 	}
-	// var data []PreliminaryProcedureResponse
-	var data []Employye
-	// company_id := 1
-	// sqlb := DefaultSqlBuilder()
-	sqlb := OracleSqlBuilder()
-	sqlb.SetSchema("HR")
-	// sqls := `select t1.autoseq,max(t1.establishment_time),max(t1.number),max(t1.name),max(t2.name) as project_unit,max(t3.name) as project_type,
-	// 	count(distinct t6.autoseq) all_num,
-	// 	count(distinct case t6.state when 1 then t6.autoseq end) not_handle_num,
-	// 	count(distinct case t6.state when 2 then t6.autoseq end) no_handle_num,
-	// 	count(distinct case t6.state when 3 then t6.autoseq end) handling_num,
-	// 	count(distinct case t6.state when 4 then t6.autoseq end) handled_num
-	// 	from tproject_info t1
-	// 	inner join tcompany t2 on t1.investor_id = t2.autoseq and t2.del = 0 @c
-	// 	left join tinvestment_type t3 on t1.industry_category_id = t3.autoseq and t3.del = 0
-	// 	left join tpreliminary_procedures t6 on t1.autoseq = t6.project_id
-	// 	where t1.del = 0 @c @c @c @c @c1
-	// 	@g`
-	sqls := `select employee_id,first_name,last_name,email from employees`
-	sqlb.Sql = sqls
-	// if company_id != 0 {
-	// 	sqlb.InsertConditions("@c1", "t2.autoseq = ?", company_id)
-	// }
-	// sqlb.Groups("group by t1.autoseq")
-	var err error
+	sqlb.Groups("group by t1.autoseq")
 	page := Page{PageIndex: 1, PageSize: 10}
 	err = sqlb.PaginateBySql(&data, &page)
 	page.Data = &data
 	fmt.Println(err, page.Data)
+
 }