fix error when get null var

session_get.go

@@ -114,6 +114,8 @@ func (session *Session) nocacheGet(beanKind reflect.Kind, table *core.Table, bea
 		return true, rows.Scan(&bean)
 	case *sql.NullInt64, *sql.NullBool, *sql.NullFloat64, *sql.NullString:
 		return true, rows.Scan(bean)
+	case *string, *int, *int8, *int16, *int32, *int64, *uint, *uint8, *uint16, *uint32, *uint64:
+		return true, rows.Scan(&bean)
 	}
 
 	switch beanKind {
@@ -142,6 +144,9 @@ func (session *Session) nocacheGet(beanKind reflect.Kind, table *core.Table, bea
 		err = rows.ScanSlice(bean)
 	case reflect.Map:
 		err = rows.ScanMap(bean)
+	case reflect.String, reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64,
+		reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
+		err = rows.Scan(&bean)
 	default:
 		err = rows.Scan(bean)
 	}

session_get_test.go

@@ -433,3 +433,37 @@ func TestGetCustomTableInterface(t *testing.T) {
 	assert.NoError(t, err)
 	assert.True(t, has)
 }
+
+func TestGetNullVar(t *testing.T) {
+	type TestGetNullVarStruct struct {
+		Id   int64
+		Name string
+		Age  int
+	}
+
+	assert.NoError(t, prepareEngine())
+	assertSync(t, new(TestGetNullVarStruct))
+
+	affected, err := testEngine.Exec("insert into " + testEngine.TableName(new(TestGetNullVarStruct), true) + " (name,age) values (null,null)")
+	assert.NoError(t, err)
+	a, _ := affected.RowsAffected()
+	assert.EqualValues(t, 1, a)
+
+	var name string
+	has, err := testEngine.Table(new(TestGetNullVarStruct)).Where("id = ?", 1).Cols("name").Get(&name)
+	assert.NoError(t, err)
+	assert.True(t, has)
+	assert.EqualValues(t, "", name)
+
+	var age int
+	has, err = testEngine.Table(new(TestGetNullVarStruct)).Where("id = ?", 1).Cols("age").Get(&age)
+	assert.NoError(t, err)
+	assert.True(t, has)
+	assert.EqualValues(t, 0, age)
+
+	var age2 int8
+	has, err = testEngine.Table(new(TestGetNullVarStruct)).Where("id = ?", 1).Cols("age").Get(&age2)
+	assert.NoError(t, err)
+	assert.True(t, has)
+	assert.EqualValues(t, 0, age2)
+}