feat: support breaker with sql statements (#3936)

core/stores/sqlx/stmt_test.go

@@ -7,7 +7,10 @@ import (
 	"testing"
 	"time"
 
+	"github.com/DATA-DOG/go-sqlmock"
 	"github.com/stretchr/testify/assert"
+	"github.com/zeromicro/go-zero/core/breaker"
+	"github.com/zeromicro/go-zero/core/stores/dbtest"
 )
 
 var errMockedPlaceholder = errors.New("placeholder")
@@ -219,6 +222,28 @@ func TestNilGuard(t *testing.T) {
 	assert.Equal(t, nilGuard{}, guard)
 }
 
+func TestStmtScanFailed(t *testing.T) {
+	dbtest.RunTest(t, func(db *sql.DB, mock sqlmock.Sqlmock) {
+		mock.ExpectPrepare("any")
+
+		conn := NewSqlConnFromDB(db)
+		stmt, err := conn.Prepare("any")
+		assert.NoError(t, err)
+
+		var val struct {
+			Foo int
+			Bar string
+		}
+		for i := 0; i < 1000; i++ {
+			row := sqlmock.NewRows([]string{"foo"}).AddRow("bar")
+			mock.ExpectQuery("any").WillReturnRows(row)
+			err := stmt.QueryRow(&val)
+			assert.Error(t, err)
+			assert.NotErrorIs(t, err, breaker.ErrServiceUnavailable)
+		}
+	})
+}
+
 type mockedSessionConn struct {
 	lastInsertId int64
 	rowsAffected int64