diff --git a/session/session_inception_print_test.go b/session/session_inception_print_test.go
index 60aab2f5..ce3cd467 100644
--- a/session/session_inception_print_test.go
+++ b/session/session_inception_print_test.go
@@ -144,3 +144,35 @@ func (s *testSessionPrintSuite) TestInsert(c *C) {
 	c.Assert(row[4], Equals, "line 1 column 21 near \"\" (total length 21)", Commentf("%v", row))
 
 }
+
+func (s *testSessionPrintSuite) TestUpdate(c *C) {
+
+	res := s.makeSQL(`update t1 set c1=1 where a=1;`)
+	row := res.Rows()[int(s.tk.Se.AffectedRows())-1]
+	c.Assert(row[2], Equals, "0", Commentf("%v", row))
+
+	res = s.makeSQL("update t1 inner join t2 on t1.id=t2.id set c2=1 where t1.c1=1;")
+	row = res.Rows()[int(s.tk.Se.AffectedRows())-1]
+	c.Assert(row[2], Equals, "0", Commentf("%v", row))
+
+}
+
+func (s *testSessionPrintSuite) TestDelete(c *C) {
+
+	res := s.makeSQL(`delete from t1 where id=1;`)
+	row := res.Rows()[int(s.tk.Se.AffectedRows())-1]
+	c.Assert(row[2], Equals, "0", Commentf("%v", row))
+
+	// res = s.makeSQL("update t1 inner join t2 on t1.id=t2.id set c2=1 where t1.c1=1;")
+	// row = res.Rows()[int(s.tk.Se.AffectedRows())-1]
+	// c.Assert(row[2], Equals, "0", Commentf("%v", row))
+
+}
+
+func (s *testSessionPrintSuite) TestAlterTable(c *C) {
+
+	res := s.makeSQL(`alter table t1 add column c1 int;`)
+	row := res.Rows()[int(s.tk.Se.AffectedRows())-1]
+	c.Assert(row[2], Equals, "0", Commentf("%v", row))
+
+}
diff --git a/session/session_print.go b/session/session_print.go
index b269d7de..f5030373 100644
--- a/session/session_print.go
+++ b/session/session_print.go
@@ -19,13 +19,12 @@ func (s *session) printCommand(ctx context.Context, stmtNode ast.StmtNode,
 	log.Debug("printCommand")
 
 	// b, err := json.MarshalIndent(stmtNode, "", "  ")
-	b, err := json.Marshal(stmtNode)
+	tree, err := json.Marshal(stmtNode)
 	if err != nil {
 		log.Error(err)
 		s.printSets.Append(2, currentSql, "", err.Error())
 	} else {
-		str := string(b)
-		s.printSets.Append(0, currentSql, str, "")
+		s.printSets.Append(0, currentSql, string(tree), "")
 	}
 
 	return nil, nil