// 增加一个参数 protected override IDbDataParameter AddParameter(object value, object dbType, int?size = null, int?precision = null, int?scale = null, ParameterDirection?direction = null) { MySqlParameter parameter = (MySqlParameter)base.AddParameter(value, dbType, size, precision, scale, direction); // 补充 DbType parameter.SetDbType(dbType); return(parameter); }