diff --git a/db.go b/db.go
index 4bef430..e805504 100644
--- a/db.go
+++ b/db.go
@@ -1,16 +1,12 @@
 package main
 
 import (
+	"gorm.io/driver/mysql"
 	"log"
 	"math/rand"
 	"os"
-	"path/filepath"
 	"time"
 
-	"gorm.io/driver/mysql"
-	"gorm.io/driver/postgres"
-	"gorm.io/driver/sqlite"
-	"gorm.io/driver/sqlserver"
 	"gorm.io/gorm"
 	"gorm.io/gorm/logger"
 	. "gorm.io/playground/models"
@@ -44,34 +40,11 @@ func init() {
 
 func OpenTestConnection() (db *gorm.DB, err error) {
 	dbDSN := os.Getenv("GORM_DSN")
-	switch os.Getenv("GORM_DIALECT") {
-	case "mysql":
-		log.Println("testing mysql...")
-		if dbDSN == "" {
-			dbDSN = "gorm:gorm@tcp(localhost:9910)/gorm?charset=utf8&parseTime=True&loc=Local"
-		}
-		db, err = gorm.Open(mysql.Open(dbDSN), &gorm.Config{})
-	case "postgres":
-		log.Println("testing postgres...")
-		if dbDSN == "" {
-			dbDSN = "user=gorm password=gorm host=localhost dbname=gorm port=9920 sslmode=disable TimeZone=Asia/Shanghai"
-		}
-		db, err = gorm.Open(postgres.Open(dbDSN), &gorm.Config{})
-	case "sqlserver":
-		// CREATE LOGIN gorm WITH PASSWORD = 'LoremIpsum86';
-		// CREATE DATABASE gorm;
-		// USE gorm;
-		// CREATE USER gorm FROM LOGIN gorm;
-		// sp_changedbowner 'gorm';
-		log.Println("testing sqlserver...")
-		if dbDSN == "" {
-			dbDSN = "sqlserver://gorm:LoremIpsum86@localhost:9930?database=gorm"
-		}
-		db, err = gorm.Open(sqlserver.Open(dbDSN), &gorm.Config{})
-	default:
-		log.Println("testing sqlite3...")
-		db, err = gorm.Open(sqlite.Open(filepath.Join(os.TempDir(), "gorm.db")), &gorm.Config{})
+	log.Println("testing mysql...")
+	if dbDSN == "" {
+		dbDSN = "gorm:gorm@tcp(localhost:9910)/gorm?charset=utf8&parseTime=True&loc=Local"
 	}
+	db, err = gorm.Open(mysql.Open(dbDSN), &gorm.Config{})
 
 	if debug := os.Getenv("DEBUG"); debug == "true" {
 		db.Logger = db.Logger.LogMode(logger.Info)
diff --git a/go.mod b/go.mod
index 1348430..0351424 100644
--- a/go.mod
+++ b/go.mod
@@ -29,8 +29,8 @@ require (
 	golang.org/x/crypto v0.41.0 // indirect
 	golang.org/x/exp v0.0.0-20250819193227-8b4c13bb791b // indirect
 	golang.org/x/mod v0.27.0 // indirect
-	golang.org/x/sync v0.16.0 // indirect
-	golang.org/x/text v0.28.0 // indirect
+	golang.org/x/sync v0.17.0 // indirect
+	golang.org/x/text v0.29.0 // indirect
 	golang.org/x/tools v0.36.0 // indirect
 	gorm.io/cmd/gorm v0.1.1-0.20250825094947-30e7d4fa1f1f // indirect
 	gorm.io/datatypes v1.2.5 // indirect
diff --git a/main_test.go b/main_test.go
index 12ffdfe..b1dde2d 100644
--- a/main_test.go
+++ b/main_test.go
@@ -2,34 +2,30 @@ package main
 
 import (
 	"testing"
-
-	"gorm.io/playground/models"
 )
 
 // GORM_REPO: https://github.com/go-gorm/gorm.git
 // GORM_BRANCH: master
-// TEST_DRIVERS: sqlite, mysql, postgres, sqlserver
+// TEST_DRIVERS: mysql
 
 func TestGORM(t *testing.T) {
-	user := models.User{Name: "jinzhu"}
-
-	DB.Create(&user)
-
-	var result models.User
-	if err := DB.First(&result, user.ID).Error; err != nil {
-		t.Errorf("Failed, got error: %v", err)
+	type GormBugTest struct {
+		IDS []string `gorm:"serializer:json;column:ids;type:varchar(1000);not null;default:'名称';comment:ids" json:"ids"`
 	}
-}
 
-// func TestGORMGen(t *testing.T) {
-// 	user := models.User{Name: "jinzhu2"}
-// 	ctx := context.Background()
-
-// 	gorm.G[models.User](DB).Create(ctx, &user)
+	for i := 0; i < 3; i++ {
+		// If a field in a database table uses the serializer tag and AutoMigrate is used,
+		// then even if there are no changes to this field
+		// ,AutoMigrate will still perform an ALTER on the table every time.
+
+		// This will alter the ids field of the GormBugTest table four times,
+		// even though the field hasn't changed at all.
+		err := DB.AutoMigrate(GormBugTest{})
+		if err != nil {
+			t.Errorf("Failed, got error: %v", err)
+		}
+	}
 
-// 	if u, err := gorm.G[models.User](DB).Where(g.User.ID.Eq(user.ID)).First(ctx); err != nil {
-// 		t.Errorf("Failed, got error: %v", err)
-// 	} else if u.Name != user.Name {
-// 		t.Errorf("Failed, got user name: %v", u.Name)
-// 	}
-// }
+	t.Log("This will alter the ids field of the GormBugTest table four times,even though the field hasn't changed at all.")
+	t.Log("这里会alter四次GormBugTest表的ids字段 虽然字段没有任何变化")
+}