fix bug when insert multiple slices with customize table name (#1433)

* fix bug when insert multiple slices with customize table name

* fix tests on mssql

* fix tests

dialect_mssql.go

@@ -254,6 +254,9 @@ func (db *mssql) SqlType(c *core.Column) string {
 	case core.TinyInt:
 		res = core.TinyInt
 		c.Length = 0
+	case core.BigInt:
+		res = core.BigInt
+		c.Length = 0
 	default:
 		res = t
 	}

session_insert.go

@@ -25,6 +25,12 @@ func (session *Session) Insert(beans ...interface{}) (int64, error) {
 		defer session.Close()
 	}
 
+	session.autoResetStatement = false
+	defer func() {
+		session.autoResetStatement = true
+		session.resetStatement()
+	}()
+
 	for _, bean := range beans {
 		switch bean.(type) {
 		case map[string]interface{}:
@@ -35,7 +41,6 @@ func (session *Session) Insert(beans ...interface{}) (int64, error) {
 			affected += cnt
 		case []map[string]interface{}:
 			s := bean.([]map[string]interface{})
-			session.autoResetStatement = false
 			for i := 0; i < len(s); i++ {
 				cnt, err := session.insertMapInterface(s[i])
 				if err != nil {
@@ -51,7 +56,6 @@ func (session *Session) Insert(beans ...interface{}) (int64, error) {
 			affected += cnt
 		case []map[string]string:
 			s := bean.([]map[string]string)
-			session.autoResetStatement = false
 			for i := 0; i < len(s); i++ {
 				cnt, err := session.insertMapString(s[i])
 				if err != nil {

session_insert_test.go

@@ -909,3 +909,42 @@ func TestInsertWhere(t *testing.T) {
 	assert.EqualValues(t, "trest3", j3.Name)
 	assert.EqualValues(t, 3, j3.Index)
 }
+
+type NightlyRate struct {
+	ID int64 `xorm:"'id' not null pk BIGINT(20)" json:"id"`
+}
+
+func (NightlyRate) TableName() string {
+	return "prd_nightly_rate"
+}
+
+func TestMultipleInsertTableName(t *testing.T) {
+	assert.NoError(t, prepareEngine())
+
+	tableName := `prd_nightly_rate_16`
+	assert.NoError(t, testEngine.Table(tableName).Sync2(new(NightlyRate)))
+
+	trans := testEngine.NewSession()
+	defer trans.Close()
+	err := trans.Begin()
+	assert.NoError(t, err)
+
+	rtArr := []interface{}{
+		[]*NightlyRate{
+			{ID: 1},
+			{ID: 2},
+		},
+		[]*NightlyRate{
+			{ID: 3},
+			{ID: 4},
+		},
+		[]*NightlyRate{
+			{ID: 5},
+		},
+	}
+
+	_, err = trans.Table(tableName).Insert(rtArr...)
+	assert.NoError(t, err)
+
+	assert.NoError(t, trans.Commit())
+}