diff --git a/doc.go b/doc.go
index bf412bda..a687e694 100644
--- a/doc.go
+++ b/doc.go
@@ -90,7 +90,7 @@ another is Rows
 
 5. Update one or more records
 
-    affected, err := engine.Id(...).Update(&user)
+    affected, err := engine.ID(...).Update(&user)
     // UPDATE user SET ...
 
 6. Delete one or more records, Delete MUST has condition
diff --git a/examples/cache.go b/examples/cache.go
index 72d987df..0c680d23 100644
--- a/examples/cache.go
+++ b/examples/cache.go
@@ -67,7 +67,7 @@ func main() {
 	fmt.Println("users3:", users3)
 
 	user4 := new(User)
-	has, err := Orm.Id(1).Get(user4)
+	has, err := Orm.ID(1).Get(user4)
 	if err != nil {
 		fmt.Println(err)
 		return
@@ -76,7 +76,7 @@ func main() {
 	fmt.Println("user4:", has, user4)
 
 	user4.Name = "xiaolunwen"
-	_, err = Orm.Id(1).Update(user4)
+	_, err = Orm.ID(1).Update(user4)
 	if err != nil {
 		fmt.Println(err)
 		return
@@ -84,14 +84,14 @@ func main() {
 	fmt.Println("user4:", user4)
 
 	user5 := new(User)
-	has, err = Orm.Id(1).Get(user5)
+	has, err = Orm.ID(1).Get(user5)
 	if err != nil {
 		fmt.Println(err)
 		return
 	}
 	fmt.Println("user5:", has, user5)
 
-	_, err = Orm.Id(1).Delete(new(User))
+	_, err = Orm.ID(1).Delete(new(User))
 	if err != nil {
 		fmt.Println(err)
 		return
@@ -99,7 +99,7 @@ func main() {
 
 	for {
 		user6 := new(User)
-		has, err = Orm.Id(1).Get(user6)
+		has, err = Orm.ID(1).Get(user6)
 		if err != nil {
 			fmt.Println(err)
 			return
diff --git a/examples/cachegoroutine.go b/examples/cachegoroutine.go
index 815e0ad1..e5b2b9d7 100644
--- a/examples/cachegoroutine.go
+++ b/examples/cachegoroutine.go
@@ -55,7 +55,7 @@ func test(engine *xorm.Engine) {
 					} else if x+j < 16 {
 						_, err = engine.Insert(&User{Name: "xlw"})
 					} else if x+j < 32 {
-						//_, err = engine.Id(1).Delete(u)
+						//_, err = engine.ID(1).Delete(u)
 						_, err = engine.Delete(u)
 					}
 					if err != nil {
diff --git a/examples/derive.go b/examples/derive.go
index 86529eea..90561514 100644
--- a/examples/derive.go
+++ b/examples/derive.go
@@ -51,7 +51,7 @@ func main() {
 	}
 
 	info := LoginInfo{}
-	_, err = orm.Id(1).Get(&info)
+	_, err = orm.ID(1).Get(&info)
 	if err != nil {
 		fmt.Println(err)
 		return
diff --git a/examples/goroutine.go b/examples/goroutine.go
index 629ea9ac..59e56d10 100644
--- a/examples/goroutine.go
+++ b/examples/goroutine.go
@@ -59,7 +59,7 @@ func test(engine *xorm.Engine) {
 					} else if x+j < 16 {
 						_, err = engine.Insert(&User{Name: "xlw"})
 					} else if x+j < 32 {
-						_, err = engine.Id(1).Delete(u)
+						_, err = engine.ID(1).Delete(u)
 					}
 					if err != nil {
 						fmt.Println(err)
diff --git a/examples/maxconnect.go b/examples/maxconnect.go
index 507cbc3c..72d0a503 100644
--- a/examples/maxconnect.go
+++ b/examples/maxconnect.go
@@ -62,7 +62,7 @@ func test(engine *xorm.Engine) {
 					} else if x+j < 16 {
 						_, err = engine.Insert(&User{Name: "xlw"})
 					} else if x+j < 32 {
-						_, err = engine.Id(1).Delete(u)
+						_, err = engine.ID(1).Delete(u)
 					}
 					if err != nil {
 						fmt.Println(err)
diff --git a/examples/singlemapping.go b/examples/singlemapping.go
index 3ae0fd1a..86e5d1d7 100644
--- a/examples/singlemapping.go
+++ b/examples/singlemapping.go
@@ -48,7 +48,7 @@ func main() {
 	}
 
 	info := LoginInfo{}
-	_, err = orm.Id(1).Get(&info)
+	_, err = orm.ID(1).Get(&info)
 	if err != nil {
 		fmt.Println(err)
 		return
diff --git a/processors_test.go b/processors_test.go
index 6c22af0a..5fc2170d 100644
--- a/processors_test.go
+++ b/processors_test.go
@@ -173,7 +173,7 @@ func TestProcessors(t *testing.T) {
 	}
 
 	p2 := &ProcessorsStruct{}
-	_, err = testEngine.Id(p.Id).Get(p2)
+	_, err = testEngine.ID(p.Id).Get(p2)
 	if err != nil {
 		t.Error(err)
 		panic(err)
@@ -308,7 +308,7 @@ func TestProcessors(t *testing.T) {
 	}
 
 	p2 = &ProcessorsStruct{}
-	_, err = testEngine.Id(p.Id).Get(p2)
+	_, err = testEngine.ID(p.Id).Get(p2)
 	if err != nil {
 		t.Error(err)
 		panic(err)
@@ -402,7 +402,7 @@ func TestProcessors(t *testing.T) {
 
 	for _, elem := range pslice {
 		p = &ProcessorsStruct{}
-		_, err = testEngine.Id(elem.Id).Get(p)
+		_, err = testEngine.ID(elem.Id).Get(p)
 		if err != nil {
 			t.Error(err)
 			panic(err)
@@ -508,7 +508,7 @@ func TestProcessorsTx(t *testing.T) {
 	}
 	session.Close()
 	p2 := &ProcessorsStruct{}
-	_, err = testEngine.Id(p.Id).Get(p2)
+	_, err = testEngine.ID(p.Id).Get(p2)
 	if err != nil {
 		t.Error(err)
 		panic(err)
@@ -569,7 +569,7 @@ func TestProcessorsTx(t *testing.T) {
 	}
 	session.Close()
 	p2 = &ProcessorsStruct{}
-	_, err = testEngine.Id(p.Id).Get(p2)
+	_, err = testEngine.ID(p.Id).Get(p2)
 	if err != nil {
 		t.Error(err)
 		panic(err)
@@ -616,7 +616,7 @@ func TestProcessorsTx(t *testing.T) {
 
 	p = p2 // reset
 
-	_, err = session.Id(insertedId).Before(b4UpdateFunc).After(afterUpdateFunc).Update(p)
+	_, err = session.ID(insertedId).Before(b4UpdateFunc).After(afterUpdateFunc).Update(p)
 	if err != nil {
 		t.Error(err)
 		panic(err)
@@ -656,7 +656,7 @@ func TestProcessorsTx(t *testing.T) {
 	session.Close()
 
 	p2 = &ProcessorsStruct{}
-	_, err = testEngine.Id(insertedId).Get(p2)
+	_, err = testEngine.ID(insertedId).Get(p2)
 	if err != nil {
 		t.Error(err)
 		panic(err)
@@ -729,7 +729,7 @@ func TestProcessorsTx(t *testing.T) {
 
 	p = &ProcessorsStruct{}
 
-	_, err = session.Id(insertedId).Before(b4UpdateFunc).After(afterUpdateFunc).Update(p)
+	_, err = session.ID(insertedId).Before(b4UpdateFunc).After(afterUpdateFunc).Update(p)
 	if err != nil {
 		t.Error(err)
 		panic(err)
@@ -767,7 +767,7 @@ func TestProcessorsTx(t *testing.T) {
 	}
 	session.Close()
 	p2 = &ProcessorsStruct{}
-	_, err = testEngine.Id(insertedId).Get(p2)
+	_, err = testEngine.ID(insertedId).Get(p2)
 	if err != nil {
 		t.Error(err)
 		panic(err)
@@ -813,7 +813,7 @@ func TestProcessorsTx(t *testing.T) {
 
 	p = &ProcessorsStruct{} // reset
 
-	_, err = session.Id(insertedId).Before(b4DeleteFunc).After(afterDeleteFunc).Delete(p)
+	_, err = session.ID(insertedId).Before(b4DeleteFunc).After(afterDeleteFunc).Delete(p)
 	if err != nil {
 		t.Error(err)
 		panic(err)
@@ -852,7 +852,7 @@ func TestProcessorsTx(t *testing.T) {
 	session.Close()
 
 	p2 = &ProcessorsStruct{}
-	_, err = testEngine.Id(insertedId).Get(p2)
+	_, err = testEngine.ID(insertedId).Get(p2)
 	if err != nil {
 		t.Error(err)
 		panic(err)
@@ -882,7 +882,7 @@ func TestProcessorsTx(t *testing.T) {
 
 	p = &ProcessorsStruct{}
 
-	_, err = session.Id(insertedId).Before(b4DeleteFunc).After(afterDeleteFunc).Delete(p)
+	_, err = session.ID(insertedId).Before(b4DeleteFunc).After(afterDeleteFunc).Delete(p)
 	if err != nil {
 		t.Error(err)
 		panic(err)
diff --git a/session.go b/session.go
index 6f7aca32..8a8d5af6 100644
--- a/session.go
+++ b/session.go
@@ -631,9 +631,7 @@ func (session *Session) slice2Bean(scanResults []interface{}, fields []string, f
 						// however, also need to consider adding a 'lazy' attribute to xorm tag which allow hasOne
 						// property to be fetched lazily
 						structInter := reflect.New(fieldValue.Type())
-						newsession := session.engine.NewSession()
-						defer newsession.Close()
-						has, err := newsession.ID(pk).NoCascade().Get(structInter.Interface())
+						has, err := session.ID(pk).NoCascade().get(structInter.Interface())
 						if err != nil {
 							return nil, err
 						}
diff --git a/session_cols_test.go b/session_cols_test.go
index f742a86a..2a292bd3 100644
--- a/session_cols_test.go
+++ b/session_cols_test.go
@@ -31,7 +31,7 @@ func TestSetExpr(t *testing.T) {
 	if testEngine.dialect.DBType() == core.MSSQL {
 		not = "~"
 	}
-	cnt, err = testEngine.SetExpr("show", not+" `show`").Id(1).Update(new(User))
+	cnt, err = testEngine.SetExpr("show", not+" `show`").ID(1).Update(new(User))
 	assert.NoError(t, err)
 	assert.EqualValues(t, 1, cnt)
 }
diff --git a/session_cond_test.go b/session_cond_test.go
index e144a0a3..5f8716f0 100644
--- a/session_cond_test.go
+++ b/session_cond_test.go
@@ -227,7 +227,7 @@ func TestIn(t *testing.T) {
 	}
 
 	user := new(Userinfo)
-	has, err := testEngine.Id(ids[0]).Get(user)
+	has, err := testEngine.ID(ids[0]).Get(user)
 	if err != nil {
 		t.Error(err)
 		panic(err)
diff --git a/session_convert.go b/session_convert.go
index 85002d27..fc244e60 100644
--- a/session_convert.go
+++ b/session_convert.go
@@ -227,9 +227,7 @@ func (session *Session) bytes2Value(col *core.Column, fieldValue *reflect.Value,
 					// however, also need to consider adding a 'lazy' attribute to xorm tag which allow hasOne
 					// property to be fetched lazily
 					structInter := reflect.New(fieldValue.Type())
-					newsession := session.engine.NewSession()
-					defer newsession.Close()
-					has, err := newsession.Id(pk).NoCascade().Get(structInter.Interface())
+					has, err := session.ID(pk).NoCascade().get(structInter.Interface())
 					if err != nil {
 						return err
 					}
@@ -510,9 +508,7 @@ func (session *Session) bytes2Value(col *core.Column, fieldValue *reflect.Value,
 						// !nashtsai! TODO for hasOne relationship, it's preferred to use join query for eager fetch
 						// however, also need to consider adding a 'lazy' attribute to xorm tag which allow hasOne
 						// property to be fetched lazily
-						newsession := session.engine.NewSession()
-						defer newsession.Close()
-						has, err := newsession.Id(pk).NoCascade().Get(structInter.Interface())
+						has, err := session.ID(pk).NoCascade().get(structInter.Interface())
 						if err != nil {
 							return err
 						}
diff --git a/session_delete_test.go b/session_delete_test.go
index ad817bd1..7eddd4cd 100644
--- a/session_delete_test.go
+++ b/session_delete_test.go
@@ -32,7 +32,7 @@ func TestDelete(t *testing.T) {
 
 	user.Uid = 0
 	user.IsMan = true
-	has, err := testEngine.Id(1).Get(&user)
+	has, err := testEngine.ID(1).Get(&user)
 	assert.NoError(t, err)
 	assert.False(t, has)
 
@@ -46,7 +46,7 @@ func TestDelete(t *testing.T) {
 
 	user.Uid = 0
 	user.IsMan = true
-	has, err = testEngine.Id(2).Get(&user)
+	has, err = testEngine.ID(2).Get(&user)
 	assert.NoError(t, err)
 	assert.False(t, has)
 }
@@ -82,16 +82,16 @@ func TestDeleted(t *testing.T) {
 
 	// Test normal Get()
 	record1 := &Deleted{}
-	has, err := testEngine.Id(1).Get(record1)
+	has, err := testEngine.ID(1).Get(record1)
 	assert.NoError(t, err)
 	assert.True(t, has)
 
 	// Test Delete() with deleted
-	affected, err := testEngine.Id(1).Delete(&Deleted{})
+	affected, err := testEngine.ID(1).Delete(&Deleted{})
 	assert.NoError(t, err)
 	assert.EqualValues(t, 1, affected)
 
-	has, err = testEngine.Id(1).Get(&Deleted{})
+	has, err = testEngine.ID(1).Get(&Deleted{})
 	assert.NoError(t, err)
 	assert.False(t, has)
 
@@ -101,17 +101,17 @@ func TestDeleted(t *testing.T) {
 	assert.EqualValues(t, 2, len(records2))
 
 	// Test no rows affected after Delete() again.
-	affected, err = testEngine.Id(1).Delete(&Deleted{})
+	affected, err = testEngine.ID(1).Delete(&Deleted{})
 	assert.NoError(t, err)
 	assert.EqualValues(t, 0, affected)
 
 	// Deleted.DeletedAt must not be updated.
-	affected, err = testEngine.Id(2).Update(&Deleted{Name: "2", DeletedAt: time.Now()})
+	affected, err = testEngine.ID(2).Update(&Deleted{Name: "2", DeletedAt: time.Now()})
 	assert.NoError(t, err)
 	assert.EqualValues(t, 1, affected)
 
 	record2 := &Deleted{}
-	has, err = testEngine.Id(2).Get(record2)
+	has, err = testEngine.ID(2).Get(record2)
 	assert.NoError(t, err)
 	assert.True(t, record2.DeletedAt.IsZero())
 
@@ -122,7 +122,7 @@ func TestDeleted(t *testing.T) {
 	assert.EqualValues(t, 3, len(unscopedRecords1))
 
 	// Delete() must really delete a record with Unscoped()
-	affected, err = testEngine.Unscoped().Id(1).Delete(&Deleted{})
+	affected, err = testEngine.Unscoped().ID(1).Delete(&Deleted{})
 	assert.NoError(t, err)
 	assert.EqualValues(t, 1, affected)
 
diff --git a/session_get.go b/session_get.go
index a697ec5e..4d33a201 100644
--- a/session_get.go
+++ b/session_get.go
@@ -18,7 +18,10 @@ func (session *Session) Get(bean interface{}) (bool, error) {
 	if session.isAutoClose {
 		defer session.Close()
 	}
+	return session.get(bean)
+}
 
+func (session *Session) get(bean interface{}) (bool, error) {
 	beanValue := reflect.ValueOf(bean)
 	if beanValue.Kind() != reflect.Ptr {
 		return false, errors.New("needs a pointer to a value")
diff --git a/session_pk_test.go b/session_pk_test.go
index 0e17352c..c919cd4f 100644
--- a/session_pk_test.go
+++ b/session_pk_test.go
@@ -127,7 +127,7 @@ func TestIntId(t *testing.T) {
 		panic(err)
 	}
 
-	cnt, err = testEngine.Id(bean.Id).Delete(&IntId{})
+	cnt, err = testEngine.ID(bean.Id).Delete(&IntId{})
 	if err != nil {
 		t.Error(err)
 		panic(err)
@@ -202,7 +202,7 @@ func TestInt16Id(t *testing.T) {
 		panic(err)
 	}
 
-	cnt, err = testEngine.Id(bean.Id).Delete(&Int16Id{})
+	cnt, err = testEngine.ID(bean.Id).Delete(&Int16Id{})
 	if err != nil {
 		t.Error(err)
 		panic(err)
@@ -277,7 +277,7 @@ func TestInt32Id(t *testing.T) {
 		panic(err)
 	}
 
-	cnt, err = testEngine.Id(bean.Id).Delete(&Int32Id{})
+	cnt, err = testEngine.ID(bean.Id).Delete(&Int32Id{})
 	if err != nil {
 		t.Error(err)
 		panic(err)
@@ -366,7 +366,7 @@ func TestUintId(t *testing.T) {
 		panic(err)
 	}
 
-	cnt, err = testEngine.Id(bean.Id).Delete(&UintId{})
+	cnt, err = testEngine.ID(bean.Id).Delete(&UintId{})
 	if err != nil {
 		t.Error(err)
 		panic(err)
@@ -441,7 +441,7 @@ func TestUint16Id(t *testing.T) {
 		panic(err)
 	}
 
-	cnt, err = testEngine.Id(bean.Id).Delete(&Uint16Id{})
+	cnt, err = testEngine.ID(bean.Id).Delete(&Uint16Id{})
 	if err != nil {
 		t.Error(err)
 		panic(err)
@@ -516,7 +516,7 @@ func TestUint32Id(t *testing.T) {
 		panic(err)
 	}
 
-	cnt, err = testEngine.Id(bean.Id).Delete(&Uint32Id{})
+	cnt, err = testEngine.ID(bean.Id).Delete(&Uint32Id{})
 	if err != nil {
 		t.Error(err)
 		panic(err)
@@ -604,7 +604,7 @@ func TestUint64Id(t *testing.T) {
 		panic(errors.New("should be equal"))
 	}
 
-	cnt, err = testEngine.Id(bean.Id).Delete(&Uint64Id{})
+	cnt, err = testEngine.ID(bean.Id).Delete(&Uint64Id{})
 	if err != nil {
 		t.Error(err)
 		panic(err)
@@ -679,7 +679,7 @@ func TestStringPK(t *testing.T) {
 		panic(err)
 	}
 
-	cnt, err = testEngine.Id(bean.Id).Delete(&StringPK{})
+	cnt, err = testEngine.ID(bean.Id).Delete(&StringPK{})
 	if err != nil {
 		t.Error(err)
 		panic(err)
@@ -725,7 +725,7 @@ func TestCompositeKey(t *testing.T) {
 	}
 
 	var compositeKeyVal CompositeKey
-	has, err := testEngine.Id(core.PK{11, 22}).Get(&compositeKeyVal)
+	has, err := testEngine.ID(core.PK{11, 22}).Get(&compositeKeyVal)
 	if err != nil {
 		t.Error(err)
 	} else if !has {
@@ -734,7 +734,7 @@ func TestCompositeKey(t *testing.T) {
 
 	var compositeKeyVal2 CompositeKey
 	// test passing PK ptr, this test seem failed withCache
-	has, err = testEngine.Id(&core.PK{11, 22}).Get(&compositeKeyVal2)
+	has, err = testEngine.ID(&core.PK{11, 22}).Get(&compositeKeyVal2)
 	if err != nil {
 		t.Error(err)
 	} else if !has {
@@ -781,14 +781,14 @@ func TestCompositeKey(t *testing.T) {
 	}
 
 	compositeKeyVal = CompositeKey{UpdateStr: "test1"}
-	cnt, err = testEngine.Id(core.PK{11, 22}).Update(&compositeKeyVal)
+	cnt, err = testEngine.ID(core.PK{11, 22}).Update(&compositeKeyVal)
 	if err != nil {
 		t.Error(err)
 	} else if cnt != 1 {
 		t.Error(errors.New("can't update CompositeKey{11, 22}"))
 	}
 
-	cnt, err = testEngine.Id(core.PK{11, 22}).Delete(&CompositeKey{})
+	cnt, err = testEngine.ID(core.PK{11, 22}).Delete(&CompositeKey{})
 	if err != nil {
 		t.Error(err)
 	} else if cnt != 1 {
@@ -832,7 +832,7 @@ func TestCompositeKey2(t *testing.T) {
 	}
 
 	var user User
-	has, err := testEngine.Id(core.PK{"11", 22}).Get(&user)
+	has, err := testEngine.ID(core.PK{"11", 22}).Get(&user)
 	if err != nil {
 		t.Error(err)
 	} else if !has {
@@ -840,7 +840,7 @@ func TestCompositeKey2(t *testing.T) {
 	}
 
 	// test passing PK ptr, this test seem failed withCache
-	has, err = testEngine.Id(&core.PK{"11", 22}).Get(&user)
+	has, err = testEngine.ID(&core.PK{"11", 22}).Get(&user)
 	if err != nil {
 		t.Error(err)
 	} else if !has {
@@ -848,14 +848,14 @@ func TestCompositeKey2(t *testing.T) {
 	}
 
 	user = User{NickName: "test1"}
-	cnt, err = testEngine.Id(core.PK{"11", 22}).Update(&user)
+	cnt, err = testEngine.ID(core.PK{"11", 22}).Update(&user)
 	if err != nil {
 		t.Error(err)
 	} else if cnt != 1 {
 		t.Error(errors.New("can't update User{11, 22}"))
 	}
 
-	cnt, err = testEngine.Id(core.PK{"11", 22}).Delete(&User{})
+	cnt, err = testEngine.ID(core.PK{"11", 22}).Delete(&User{})
 	if err != nil {
 		t.Error(err)
 	} else if cnt != 1 {
@@ -900,7 +900,7 @@ func TestCompositeKey3(t *testing.T) {
 	}
 
 	var user UserPK2
-	has, err := testEngine.Id(core.PK{"11", 22}).Get(&user)
+	has, err := testEngine.ID(core.PK{"11", 22}).Get(&user)
 	if err != nil {
 		t.Error(err)
 	} else if !has {
@@ -908,7 +908,7 @@ func TestCompositeKey3(t *testing.T) {
 	}
 
 	// test passing PK ptr, this test seem failed withCache
-	has, err = testEngine.Id(&core.PK{"11", 22}).Get(&user)
+	has, err = testEngine.ID(&core.PK{"11", 22}).Get(&user)
 	if err != nil {
 		t.Error(err)
 	} else if !has {
@@ -916,14 +916,14 @@ func TestCompositeKey3(t *testing.T) {
 	}
 
 	user = UserPK2{NickName: "test1"}
-	cnt, err = testEngine.Id(core.PK{"11", 22}).Update(&user)
+	cnt, err = testEngine.ID(core.PK{"11", 22}).Update(&user)
 	if err != nil {
 		t.Error(err)
 	} else if cnt != 1 {
 		t.Error(errors.New("can't update User{11, 22}"))
 	}
 
-	cnt, err = testEngine.Id(core.PK{"11", 22}).Delete(&UserPK2{})
+	cnt, err = testEngine.ID(core.PK{"11", 22}).Delete(&UserPK2{})
 	if err != nil {
 		t.Error(err)
 	} else if cnt != 1 {
@@ -1007,7 +1007,7 @@ func TestMyIntId(t *testing.T) {
 		panic(errors.New("should be equal"))
 	}
 
-	cnt, err = testEngine.Id(bean.ID).Delete(&MyIntPK{})
+	cnt, err = testEngine.ID(bean.ID).Delete(&MyIntPK{})
 	if err != nil {
 		t.Error(err)
 		panic(err)
@@ -1095,7 +1095,7 @@ func TestMyStringId(t *testing.T) {
 		panic(errors.New("should be equal"))
 	}
 
-	cnt, err = testEngine.Id(bean.ID).Delete(&MyStringPK{})
+	cnt, err = testEngine.ID(bean.ID).Delete(&MyStringPK{})
 	if err != nil {
 		t.Error(err)
 		panic(err)
diff --git a/session_update_test.go b/session_update_test.go
index 70582551..ccd713ae 100644
--- a/session_update_test.go
+++ b/session_update_test.go
@@ -298,7 +298,7 @@ func TestUpdate1(t *testing.T) {
 
 	// update by id
 	user := Userinfo{Username: "xxx", Height: 1.2}
-	cnt, err := testEngine.Id(ori.Uid).Update(&user)
+	cnt, err := testEngine.ID(ori.Uid).Update(&user)
 	if err != nil {
 		t.Error(err)
 		panic(err)
@@ -311,7 +311,7 @@ func TestUpdate1(t *testing.T) {
 	}
 
 	condi := Condi{"username": "zzz", "departname": ""}
-	cnt, err = testEngine.Table(&user).Id(ori.Uid).Update(&condi)
+	cnt, err = testEngine.Table(&user).ID(ori.Uid).Update(&condi)
 	if err != nil {
 		t.Error(err)
 		panic(err)
@@ -351,7 +351,7 @@ func TestUpdate1(t *testing.T) {
 		}
 		userID := user.Uid
 
-		has, err := testEngine.Id(userID).
+		has, err := testEngine.ID(userID).
 			And("username = ?", user.Username).
 			And("height = ?", user.Height).
 			And("departname = ?", "").
@@ -369,7 +369,7 @@ func TestUpdate1(t *testing.T) {
 		}
 
 		updatedUser := &Userinfo{Username: "null data"}
-		cnt, err = testEngine.Id(userID).
+		cnt, err = testEngine.ID(userID).
 			Nullable("height", "departname", "is_man", "created").
 			Update(updatedUser)
 		if err != nil {
@@ -382,7 +382,7 @@ func TestUpdate1(t *testing.T) {
 			panic(err)
 		}
 
-		has, err = testEngine.Id(userID).
+		has, err = testEngine.ID(userID).
 			And("username = ?", updatedUser.Username).
 			And("height IS NULL").
 			And("departname IS NULL").
@@ -400,7 +400,7 @@ func TestUpdate1(t *testing.T) {
 			panic(err)
 		}
 
-		cnt, err = testEngine.Id(userID).Delete(&Userinfo{})
+		cnt, err = testEngine.ID(userID).Delete(&Userinfo{})
 		if err != nil {
 			t.Error(err)
 			panic(err)
@@ -445,7 +445,7 @@ func TestUpdate1(t *testing.T) {
 		panic(err)
 	}
 
-	cnt, err = testEngine.Id(a.Id).Update(&Article{Name: "6"})
+	cnt, err = testEngine.ID(a.Id).Update(&Article{Name: "6"})
 	if err != nil {
 		t.Error(err)
 		panic(err)
@@ -474,14 +474,14 @@ func TestUpdate1(t *testing.T) {
 	}
 
 	col2 := &UpdateAllCols{col1.Id, true, "", nil}
-	_, err = testEngine.Id(col2.Id).AllCols().Update(col2)
+	_, err = testEngine.ID(col2.Id).AllCols().Update(col2)
 	if err != nil {
 		t.Error(err)
 		panic(err)
 	}
 
 	col3 := &UpdateAllCols{}
-	has, err = testEngine.Id(col2.Id).Get(col3)
+	has, err = testEngine.ID(col2.Id).Get(col3)
 	if err != nil {
 		t.Error(err)
 		panic(err)
@@ -519,14 +519,14 @@ func TestUpdate1(t *testing.T) {
 		col2 := &UpdateMustCols{col1.Id, true, ""}
 		boolStr := testEngine.ColumnMapper.Obj2Table("Bool")
 		stringStr := testEngine.ColumnMapper.Obj2Table("String")
-		_, err = testEngine.Id(col2.Id).MustCols(boolStr, stringStr).Update(col2)
+		_, err = testEngine.ID(col2.Id).MustCols(boolStr, stringStr).Update(col2)
 		if err != nil {
 			t.Error(err)
 			panic(err)
 		}
 
 		col3 := &UpdateMustCols{}
-		has, err := testEngine.Id(col2.Id).Get(col3)
+		has, err := testEngine.ID(col2.Id).Get(col3)
 		if err != nil {
 			t.Error(err)
 			panic(err)
@@ -561,27 +561,27 @@ func TestUpdateIncrDecr(t *testing.T) {
 
 	colName := testEngine.ColumnMapper.Obj2Table("Cnt")
 
-	cnt, err := testEngine.Id(col1.Id).Incr(colName).Update(col1)
+	cnt, err := testEngine.ID(col1.Id).Incr(colName).Update(col1)
 	assert.NoError(t, err)
 	assert.EqualValues(t, 1, cnt)
 
 	newCol := new(UpdateIncr)
-	has, err := testEngine.Id(col1.Id).Get(newCol)
+	has, err := testEngine.ID(col1.Id).Get(newCol)
 	assert.NoError(t, err)
 	assert.True(t, has)
 	assert.EqualValues(t, 1, newCol.Cnt)
 
-	cnt, err = testEngine.Id(col1.Id).Decr(colName).Update(col1)
+	cnt, err = testEngine.ID(col1.Id).Decr(colName).Update(col1)
 	assert.NoError(t, err)
 	assert.EqualValues(t, 1, cnt)
 
 	newCol = new(UpdateIncr)
-	has, err = testEngine.Id(col1.Id).Get(newCol)
+	has, err = testEngine.ID(col1.Id).Get(newCol)
 	assert.NoError(t, err)
 	assert.True(t, has)
 	assert.EqualValues(t, 0, newCol.Cnt)
 
-	cnt, err = testEngine.Id(col1.Id).Cols(colName).Incr(colName).Update(col1)
+	cnt, err = testEngine.ID(col1.Id).Cols(colName).Incr(colName).Update(col1)
 	assert.NoError(t, err)
 	assert.EqualValues(t, 1, cnt)
 }
@@ -626,12 +626,12 @@ func TestUpdateUpdated(t *testing.T) {
 	}
 
 	ci := &UpdatedUpdate{}
-	_, err = testEngine.Id(1).Update(ci)
+	_, err = testEngine.ID(1).Update(ci)
 	if err != nil {
 		t.Fatal(err)
 	}
 
-	has, err := testEngine.Id(1).Get(di)
+	has, err := testEngine.ID(1).Get(di)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -654,11 +654,11 @@ func TestUpdateUpdated(t *testing.T) {
 		t.Fatal(err)
 	}
 	ci2 := &UpdatedUpdate2{}
-	_, err = testEngine.Id(1).Update(ci2)
+	_, err = testEngine.ID(1).Update(ci2)
 	if err != nil {
 		t.Fatal(err)
 	}
-	has, err = testEngine.Id(1).Get(di2)
+	has, err = testEngine.ID(1).Get(di2)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -681,12 +681,12 @@ func TestUpdateUpdated(t *testing.T) {
 		t.Fatal(err)
 	}
 	ci3 := &UpdatedUpdate3{}
-	_, err = testEngine.Id(1).Update(ci3)
+	_, err = testEngine.ID(1).Update(ci3)
 	if err != nil {
 		t.Fatal(err)
 	}
 
-	has, err = testEngine.Id(1).Get(di3)
+	has, err = testEngine.ID(1).Get(di3)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -710,12 +710,12 @@ func TestUpdateUpdated(t *testing.T) {
 	}
 
 	ci4 := &UpdatedUpdate4{}
-	_, err = testEngine.Id(1).Update(ci4)
+	_, err = testEngine.ID(1).Update(ci4)
 	if err != nil {
 		t.Fatal(err)
 	}
 
-	has, err = testEngine.Id(1).Get(di4)
+	has, err = testEngine.ID(1).Get(di4)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -738,12 +738,12 @@ func TestUpdateUpdated(t *testing.T) {
 		t.Fatal(err)
 	}
 	ci5 := &UpdatedUpdate5{}
-	_, err = testEngine.Id(1).Update(ci5)
+	_, err = testEngine.ID(1).Update(ci5)
 	if err != nil {
 		t.Fatal(err)
 	}
 
-	has, err = testEngine.Id(1).Get(di5)
+	has, err = testEngine.ID(1).Get(di5)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -796,7 +796,7 @@ func TestUpdateSameMapper(t *testing.T) {
 	}
 	// update by id
 	user := Userinfo{Username: "xxx", Height: 1.2}
-	cnt, err := testEngine.Id(ori.Uid).Update(&user)
+	cnt, err := testEngine.ID(ori.Uid).Update(&user)
 	if err != nil {
 		t.Error(err)
 		panic(err)
@@ -809,7 +809,7 @@ func TestUpdateSameMapper(t *testing.T) {
 	}
 
 	condi := Condi{"Username": "zzz", "Departname": ""}
-	cnt, err = testEngine.Table(&user).Id(ori.Uid).Update(&condi)
+	cnt, err = testEngine.Table(&user).ID(ori.Uid).Update(&condi)
 	if err != nil {
 		t.Error(err)
 		panic(err)
@@ -874,7 +874,7 @@ func TestUpdateSameMapper(t *testing.T) {
 		panic(err)
 	}
 
-	cnt, err = testEngine.Id(a.Id).Update(&Article{Name: "6"})
+	cnt, err = testEngine.ID(a.Id).Update(&Article{Name: "6"})
 	if err != nil {
 		t.Error(err)
 		panic(err)
@@ -901,14 +901,14 @@ func TestUpdateSameMapper(t *testing.T) {
 	}
 
 	col2 := &UpdateAllCols{col1.Id, true, "", nil}
-	_, err = testEngine.Id(col2.Id).AllCols().Update(col2)
+	_, err = testEngine.ID(col2.Id).AllCols().Update(col2)
 	if err != nil {
 		t.Error(err)
 		panic(err)
 	}
 
 	col3 := &UpdateAllCols{}
-	has, err = testEngine.Id(col2.Id).Get(col3)
+	has, err = testEngine.ID(col2.Id).Get(col3)
 	if err != nil {
 		t.Error(err)
 		panic(err)
@@ -945,14 +945,14 @@ func TestUpdateSameMapper(t *testing.T) {
 		col2 := &UpdateMustCols{col1.Id, true, ""}
 		boolStr := testEngine.ColumnMapper.Obj2Table("Bool")
 		stringStr := testEngine.ColumnMapper.Obj2Table("String")
-		_, err = testEngine.Id(col2.Id).MustCols(boolStr, stringStr).Update(col2)
+		_, err = testEngine.ID(col2.Id).MustCols(boolStr, stringStr).Update(col2)
 		if err != nil {
 			t.Error(err)
 			panic(err)
 		}
 
 		col3 := &UpdateMustCols{}
-		has, err := testEngine.Id(col2.Id).Get(col3)
+		has, err := testEngine.ID(col2.Id).Get(col3)
 		if err != nil {
 			t.Error(err)
 			panic(err)
@@ -988,7 +988,7 @@ func TestUpdateSameMapper(t *testing.T) {
 			panic(err)
 		}
 
-		cnt, err := testEngine.Id(col1.Id).Incr("`Cnt`").Update(col1)
+		cnt, err := testEngine.ID(col1.Id).Incr("`Cnt`").Update(col1)
 		if err != nil {
 			t.Error(err)
 			panic(err)
@@ -1000,7 +1000,7 @@ func TestUpdateSameMapper(t *testing.T) {
 		}
 
 		newCol := new(UpdateIncr)
-		has, err := testEngine.Id(col1.Id).Get(newCol)
+		has, err := testEngine.ID(col1.Id).Get(newCol)
 		if err != nil {
 			t.Error(err)
 			panic(err)
@@ -1119,7 +1119,7 @@ func TestNoUpdate(t *testing.T) {
 	})
 	assert.NoError(t, err)
 
-	_, err = testEngine.Id(1).Update(&NoUpdate{})
+	_, err = testEngine.ID(1).Update(&NoUpdate{})
 	assert.Error(t, err)
 	assert.EqualValues(t, "No content found to be updated", err.Error())
 }
diff --git a/tag_extends_test.go b/tag_extends_test.go
index 4b94fd4b..61a61e9e 100644
--- a/tag_extends_test.go
+++ b/tag_extends_test.go
@@ -86,7 +86,7 @@ func TestExtends(t *testing.T) {
 	}
 
 	tu3 := &tempUser2{tempUser{0, "extends update"}, ""}
-	_, err = testEngine.Id(tu2.TempUser.Id).Update(tu3)
+	_, err = testEngine.ID(tu2.TempUser.Id).Update(tu3)
 	if err != nil {
 		t.Error(err)
 		panic(err)
@@ -124,7 +124,7 @@ func TestExtends(t *testing.T) {
 	}
 
 	tu10 := &tempUser4{tempUser2{tempUser{0, "extends update"}, ""}}
-	_, err = testEngine.Id(tu9.TempUser2.TempUser.Id).Update(tu10)
+	_, err = testEngine.ID(tu9.TempUser2.TempUser.Id).Update(tu10)
 	if err != nil {
 		t.Error(err)
 		panic(err)
@@ -168,7 +168,7 @@ func TestExtends(t *testing.T) {
 	}
 
 	tu6 := &tempUser3{&tempUser{0, "extends update"}, ""}
-	_, err = testEngine.Id(tu5.Temp.Id).Update(tu6)
+	_, err = testEngine.ID(tu5.Temp.Id).Update(tu6)
 	if err != nil {
 		t.Error(err)
 		panic(err)
diff --git a/tag_test.go b/tag_test.go
index edb18506..dc7ff2fa 100644
--- a/tag_test.go
+++ b/tag_test.go
@@ -51,7 +51,7 @@ func TestCreatedAndUpdated(t *testing.T) {
 	}
 
 	u.Name = "xxx"
-	cnt, err = testEngine.Id(u.Id).Update(u)
+	cnt, err = testEngine.ID(u.Id).Update(u)
 	if err != nil {
 		t.Error(err)
 		panic(err)
@@ -130,13 +130,13 @@ func TestCreatedUpdated(t *testing.T) {
 	assert.NoError(t, err)
 
 	c2 := new(CreatedUpdated)
-	has, err := testEngine.Id(c.Id).Get(c2)
+	has, err := testEngine.ID(c.Id).Get(c2)
 	assert.NoError(t, err)
 
 	assert.True(t, has)
 
 	c2.Value -= 1
-	_, err = testEngine.Id(c2.Id).Update(c2)
+	_, err = testEngine.ID(c2.Id).Update(c2)
 	assert.NoError(t, err)
 }
 
diff --git a/tag_version_test.go b/tag_version_test.go
index 1aeabcaa..570a6754 100644
--- a/tag_version_test.go
+++ b/tag_version_test.go
@@ -49,7 +49,7 @@ func TestVersion1(t *testing.T) {
 	}
 
 	newVer := new(VersionS)
-	has, err := testEngine.Id(ver.Id).Get(newVer)
+	has, err := testEngine.ID(ver.Id).Get(newVer)
 	if err != nil {
 		t.Error(err)
 		panic(err)
@@ -67,7 +67,7 @@ func TestVersion1(t *testing.T) {
 	}
 
 	newVer.Name = "-------"
-	_, err = testEngine.Id(ver.Id).Update(newVer)
+	_, err = testEngine.ID(ver.Id).Update(newVer)
 	if err != nil {
 		t.Error(err)
 		panic(err)
@@ -78,7 +78,7 @@ func TestVersion1(t *testing.T) {
 	}
 
 	newVer = new(VersionS)
-	has, err = testEngine.Id(ver.Id).Get(newVer)
+	has, err = testEngine.ID(ver.Id).Get(newVer)
 	if err != nil {
 		t.Error(err)
 		panic(err)
diff --git a/types_null_test.go b/types_null_test.go
index 776b2e6e..22fc1024 100644
--- a/types_null_test.go
+++ b/types_null_test.go
@@ -176,7 +176,7 @@ func TestNullStructUpdate(t *testing.T) {
 		item.Age = sql.NullInt64{23, true}
 		item.Height = sql.NullFloat64{0, false} // update to NULL
 
-		affected, err := testEngine.Id(2).Cols("age", "height", "is_man").Update(item)
+		affected, err := testEngine.ID(2).Cols("age", "height", "is_man").Update(item)
 		if err != nil {
 			t.Error(err)
 			panic(err)
@@ -224,7 +224,7 @@ func TestNullStructUpdate(t *testing.T) {
 			// IsMan:  sql.NullBool{true, true},
 		}
 
-		_, err := testEngine.AllCols().Id(6).Update(item)
+		_, err := testEngine.AllCols().ID(6).Update(item)
 		if err != nil {
 			t.Error(err)
 			panic(err)
@@ -268,7 +268,7 @@ func TestNullStructFind(t *testing.T) {
 
 	if true {
 		item := new(NullType)
-		has, err := testEngine.Id(1).Get(item)
+		has, err := testEngine.ID(1).Get(item)
 		if err != nil {
 			t.Error(err)
 			panic(err)
@@ -305,7 +305,7 @@ func TestNullStructFind(t *testing.T) {
 	if true {
 		item := make([]NullType, 0)
 
-		err := testEngine.Id(2).Find(&item)
+		err := testEngine.ID(2).Find(&item)
 		if err != nil {
 			t.Error(err)
 			panic(err)
@@ -390,7 +390,7 @@ func TestNullStructDelete(t *testing.T) {
 
 	item := new(NullType)
 
-	_, err := testEngine.Id(1).Delete(item)
+	_, err := testEngine.ID(1).Delete(item)
 	if err != nil {
 		t.Error(err)
 		panic(err)
diff --git a/types_test.go b/types_test.go
index aadf5f69..df4ee70e 100644
--- a/types_test.go
+++ b/types_test.go
@@ -37,7 +37,7 @@ func TestArrayField(t *testing.T) {
 	assert.EqualValues(t, 1, cnt)
 
 	var arr ArrayStruct
-	has, err := testEngine.Id(1).Get(&arr)
+	has, err := testEngine.ID(1).Get(&arr)
 	assert.NoError(t, err)
 	assert.Equal(t, true, has)
 	assert.Equal(t, as.Name, arr.Name)
@@ -320,7 +320,7 @@ func TestCustomType2(t *testing.T) {
 	assert.NoError(t, err)
 
 	user := UserCus{}
-	exist, err := testEngine.Id(1).Get(&user)
+	exist, err := testEngine.ID(1).Get(&user)
 	assert.NoError(t, err)
 	assert.True(t, exist)