- add dao.SetWeiXinsEmpty2Null

- call SetWeiXinsEmpty2Null in BindMobile2Store and AddMobile2Mobile

business/model/dao/dao_user.go

@@ -10,7 +10,16 @@ func CreateWeiXins(db *DaoDB, user *legacymodel.WeiXins) (err error) {
 		Rollback(db)
 		return err
 	}
-	if _, err = ExecuteSQL(db, `
+	if err = SetWeiXinsEmpty2Null(db, user); err != nil {
+		Rollback(db)
+		return err
+	}
+	Commit(db)
+	return err
+}
+
+func SetWeiXinsEmpty2Null(db *DaoDB, user *legacymodel.WeiXins) (err error) {
+	_, err = ExecuteSQL(db, `
 	UPDATE weixins
 	SET
 	openid = IF(openid = '', NULL, openid),
@@ -19,11 +28,7 @@ func CreateWeiXins(db *DaoDB, user *legacymodel.WeiXins) (err error) {
 	tel = IF(tel = '', NULL, tel),
 	parentid = IF(parentid = 0, -1, parentid)
 	WHERE id = ?
-	`, user.ID); err != nil {
-		Rollback(db)
-		return err
-	}
-	Commit(db)
+	`, user.ID)
 	return err
 }