diff --git a/internal/conf/db.go b/internal/conf/db.go
index 37304f4d..53ce0f16 100644
--- a/internal/conf/db.go
+++ b/internal/conf/db.go
@@ -5,16 +5,30 @@
 package conf
 
 import (
+	"database/sql"
 	"sync"
 
+	"github.com/alimy/cfg"
 	"github.com/go-redis/redis/v8"
+	"github.com/sirupsen/logrus"
 )
 
 var (
-	_redisClient *redis.Client
-	_onceRedis   sync.Once
+	_sqldb               *sql.DB
+	_redisClient         *redis.Client
+	_onceSql, _onceRedis sync.Once
 )
 
+func MustSqlDB() *sql.DB {
+	_onceSql.Do(func() {
+		var err error
+		if _, _sqldb, err = newSqlDB(); err != nil {
+			logrus.Fatalf("new sql db failed: %s", err)
+		}
+	})
+	return _sqldb
+}
+
 func MustRedis() *redis.Client {
 	_onceRedis.Do(func() {
 		_redisClient = redis.NewClient(&redis.Options{
@@ -25,3 +39,19 @@ func MustRedis() *redis.Client {
 	})
 	return _redisClient
 }
+
+func newSqlDB() (driver string, db *sql.DB, err error) {
+	if cfg.If("MySQL") {
+		driver = "mysql"
+		db, err = sql.Open(driver, MysqlSetting.Dsn())
+	} else if cfg.If("PostgreSQL") || cfg.If("Postgres") {
+		driver = "pgx"
+		db, err = sql.Open(driver, PostgresSetting.Dsn())
+	} else if cfg.If("Sqlite3") {
+		driver, db, err = OpenSqlite3()
+	} else {
+		driver = "mysql"
+		db, err = sql.Open(driver, MysqlSetting.Dsn())
+	}
+	return
+}
diff --git a/internal/conf/db_sqlx.go b/internal/conf/db_sqlx.go
index 9b4b3c2c..c2699c84 100644
--- a/internal/conf/db_sqlx.go
+++ b/internal/conf/db_sqlx.go
@@ -5,10 +5,8 @@
 package conf
 
 import (
-	"database/sql"
 	"sync"
 
-	"github.com/alimy/cfg"
 	"github.com/jmoiron/sqlx"
 	"github.com/sirupsen/logrus"
 )
@@ -20,28 +18,11 @@ var (
 
 func MustSqlxDB() *sqlx.DB {
 	_onceSqlx.Do(func() {
-		var err error
-		if _sqlxdb, err = newSqlxDB(); err != nil {
+		driver, db, err := newSqlDB()
+		if err != nil {
 			logrus.Fatalf("new sqlx db failed: %s", err)
 		}
+		_sqlxdb = sqlx.NewDb(db, driver)
 	})
 	return _sqlxdb
 }
-
-func newSqlxDB() (db *sqlx.DB, err error) {
-	if cfg.If("MySQL") {
-		db, err = sqlx.Open("mysql", MysqlSetting.Dsn())
-	} else if cfg.If("PostgreSQL") || cfg.If("Postgres") {
-		db, err = sqlx.Open("pgx", PostgresSetting.Dsn())
-	} else if cfg.If("Sqlite3") {
-		var (
-			driver string
-			sqldb  *sql.DB
-		)
-		driver, sqldb, err = OpenSqlite3()
-		db = sqlx.NewDb(sqldb, driver)
-	} else {
-		db, err = sqlx.Open("mysql", MysqlSetting.Dsn())
-	}
-	return
-}