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package mysql
//var (
// MsgSer = component.MySQLClient{}
//)
//
//type Model interface {
// TableName() string
// DB() *gorm.DB
//}
//
//func GetMsgSerDB() *gorm.DB {
// return MsgSer.DB
//}
//
//func GetById(m Model, id int) error {
// tx := m.DB().Where("id=?", id).Take(m)
// return tx.Error
//}
//
//func Add(m Model) error {
// tx := m.DB().Create(m)
// return tx.Error
//}
//
//func Save(m Model, id int, columns []string) error {
// tx := m.DB().Select(columns)
// tx.Where("id=?", id).Updates(m)
// return tx.Error
//}
//
//func OrderBySQL(orderBy string, order int, isNullBottom bool) string {
// if orderBy != "" {
// if isNullBottom {
// orderBy = fmt.Sprintf("IF(%s IS NULL, 0, 1) desc, %s", orderBy, orderBy)
// }
// if order == 0 { // 为0倒序否则升序
// return fmt.Sprintf("%s desc", orderBy)
// } else {
// return fmt.Sprintf("%s asc ", orderBy)
// }
// }
// return ""
//}
//
//func GetOrderByStr(by string, order int, isNullBottom bool) string {
// if by != "" {
// if isNullBottom {
// by = fmt.Sprintf("IF(%s IS NULL, 0, 1) desc, %s", by, by)
// }
// if order == 1 { // 为0倒序否则升序
// return fmt.Sprintf("%s desc ", by)
// } else {
// return fmt.Sprintf("%s asc ", by)
// }
// }
// return ""
//}