Fix: empty transaction should be committed successfully

conn.go

@@ -62,6 +62,10 @@ func (c *Conn) commit() error {
 		c.txMode = txNone
 		c.txStmtList = nil
 	}()
+	if len(c.txStmtList) == 0 {
+		//empty transaction should be successful
+		return nil
+	}
 	c.txMode = txCommitting
 	txStmts := make([]types.ParameterizedStatement, len(c.txStmtList))
 	for i, txStmt := range c.txStmtList {

module_test/tx_test.go

@@ -6,6 +6,22 @@ import (
 	"testing"
 )
 
+func TestTx_Empty(t *testing.T) {
+	testName := "TestTx_Empty"
+	db := _openDb(t, testName)
+	defer func() { _ = db.Close() }()
+	_initTest(db)
+
+	tx, err := db.Begin()
+	if err != nil {
+		t.Fatalf("%s failed: %s", testName+"/Begin", err)
+	}
+	err = tx.Commit()
+	if err != nil {
+		t.Fatalf("%s failed: %s", testName+"/Commit", err)
+	}
+}
+
 func TestTx_Rollback(t *testing.T) {
 	testName := "TestTx_Rollback"
 	db := _openDb(t, testName)