From 88a47176f3a72dfac6e6ef27f994ad8f99989de4 Mon Sep 17 00:00:00 2001
From: Jinzhu <wosmvp@gmail.com>
Date: Tue, 18 Apr 2017 17:16:10 +0800
Subject: [PATCH] Use tinyint to int8

---
 dialect_mysql.go | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/dialect_mysql.go b/dialect_mysql.go
index b471a162..493a3c33 100644
--- a/dialect_mysql.go
+++ b/dialect_mysql.go
@@ -42,14 +42,28 @@ func (s *mysql) DataTypeOf(field *StructField) string {
 		switch dataValue.Kind() {
 		case reflect.Bool:
 			sqlType = "boolean"
-		case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32:
+		case reflect.Int8:
+			if _, ok := field.TagSettings["AUTO_INCREMENT"]; ok || field.IsPrimaryKey {
+				field.TagSettings["AUTO_INCREMENT"] = "AUTO_INCREMENT"
+				sqlType = "tinyint AUTO_INCREMENT"
+			} else {
+				sqlType = "tinyint"
+			}
+		case reflect.Int, reflect.Int16, reflect.Int32:
 			if _, ok := field.TagSettings["AUTO_INCREMENT"]; ok || field.IsPrimaryKey {
 				field.TagSettings["AUTO_INCREMENT"] = "AUTO_INCREMENT"
 				sqlType = "int AUTO_INCREMENT"
 			} else {
 				sqlType = "int"
 			}
-		case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uintptr:
+		case reflect.Uint8:
+			if _, ok := field.TagSettings["AUTO_INCREMENT"]; ok || field.IsPrimaryKey {
+				field.TagSettings["AUTO_INCREMENT"] = "AUTO_INCREMENT"
+				sqlType = "tinyint unsigned AUTO_INCREMENT"
+			} else {
+				sqlType = "tinyint unsigned"
+			}
+		case reflect.Uint, reflect.Uint16, reflect.Uint32, reflect.Uintptr:
 			if _, ok := field.TagSettings["AUTO_INCREMENT"]; ok || field.IsPrimaryKey {
 				field.TagSettings["AUTO_INCREMENT"] = "AUTO_INCREMENT"
 				sqlType = "int unsigned AUTO_INCREMENT"