主键Id自增，如何获取Id（Dapper）

这里用的是Dapper,以前用EF的时候好像有用到过db.savechanges(). 但是项目中没有这个，所以用以下的方法去获取id

背景：涉及到多表入库，需要获取主表的Id，所以用到了这个(timeFields  可以忽略）

 

 

  /// <summary>/// 单个添加/// </summary>/// <typeparam name="T"></typeparam>/// <param name="t"></param>/// <param name="timeFields"></param>public int AddBackId<T>(T t, List<string> timeFields = null){var sql = GetSql(InsertSql, timeFields);if (!sql.EndsWith(";")){sql += ";";}if (!sql.EndsWith("SELECT LAST_INSERT_ID();")){sql += "SELECT LAST_INSERT_ID();";}return DB.Query<int>(sql, t).FirstOrDefault();}

  private string GetSql(string oSql, IEnumerable<string> timeFields = null){var fields = new List<string>();fields.AddRange(TimeFields);if (timeFields != null && timeFields.Any()){fields.AddRange(timeFields.Where(x => !TimeFields.Contains(x)));}var sql = oSql;if (fields.Any()){foreach (var field in fields){sql = sql.Replace($"@{field}", $"IF(@{field} = '0001-01-01 00:00:00', NULL, @{field})");}}return sql;}