Revert "support reuse session to transaction (#650)" (#651)

This reverts commit c412be2365.

session_tx.go

@@ -24,7 +24,6 @@ func (session *Session) Rollback() error {
 	if !session.IsAutoCommit && !session.IsCommitedOrRollbacked {
 		session.saveLastSQL(session.Engine.dialect.RollBackStr())
 		session.IsCommitedOrRollbacked = true
-		session.IsAutoCommit = true
 		return session.Tx.Rollback()
 	}
 	return nil
@@ -35,7 +34,6 @@ func (session *Session) Commit() error {
 	if !session.IsAutoCommit && !session.IsCommitedOrRollbacked {
 		session.saveLastSQL("COMMIT")
 		session.IsCommitedOrRollbacked = true
-		session.IsAutoCommit = true
 		var err error
 		if err = session.Tx.Commit(); err == nil {
 			// handle processors after tx committed

session_tx_test.go

@@ -190,34 +190,3 @@ func TestCombineTransactionSameMapper(t *testing.T) {
 		panic(err)
 	}
 }
-
-func TestReuseTransaction(t *testing.T) {
-	assert.NoError(t, prepareEngine())
-	sess := testEngine.NewSession()
-	defer sess.Close()
-
-	type ReuseTx struct {
-		Id   int64
-		Name string
-	}
-
-	assertSync(t, new(ReuseTx))
-
-	records := []ReuseTx{
-		{
-			Name: "1",
-		},
-		{
-			Name: "3",
-		},
-		{
-			Name: "2",
-		},
-	}
-	for _, r := range records {
-		assert.NoError(t, sess.Begin())
-		_, err := sess.Insert(&r)
-		assert.NoError(t, err)
-		assert.NoError(t, sess.Commit())
-	}
-}