MVC LINQ中用封装的TSQL通用更新方法

Posted 2020-07-30 那就让我这样吧

把TSQL拿出来，做了一个封装，适用的所有表，更新有两种，普通更新和记数更新

看代码：这两个方法是写在DAL里的数据操作基类里的，只有它的子类可以用它，所以用protected做为限制

   /// <summary>
        /// 通用更新方法
        /// </summary>
        /// <param name="tableName">表名</param>
        /// <param name="param">参数列表，奇数为字段，偶数为他前一奇数对应的值，索引0为要更新的主键,1为主键值</param>
        protected virtual void Update(string tableName, params object[] param)
        {
            StringBuilder sbSql = new StringBuilder();
            List<object> listParasm = new List<object>();
            listParasm.Add(param[0]);
            listParasm.Add(param[1]);
            int index = listParasm.Count;
            sbSql.AppendFormat("UPDATE [{0}] SET ", tableName);

            if (index == 0)
            {
                return;
            }
            else
            {
                for (int i = 2; i < param.Count(); i += 2)
                {
                    if (param[index + 1].GetType() == typeof(string))
                        sbSql.AppendFormat("{{{0}}} = ‘{{{1}}}‘,", index, index + 1);
                    else
                        sbSql.AppendFormat("{{{0}}} = {{{1}}},", index, index + 1);
                    listParasm.Add(param[index]);
                    listParasm.Add(param[index + 1]);
                    index++;
                    index++;
                }

                sbSql.Remove(sbSql.Length - 1, 1);//移除最后一个逗号
            }

            sbSql.Append(" WHERE [{0}] = {1}");
            db.ExecuteCommand(sbSql.ToString(), listParasm.ToArray());
        }

        /// <summary>
        ///  计数更新
        /// </summary>
        /// <param name="tableName">表名</param>
        /// <param name="param">参数列表，索引0为主键名，1表主键值，2为要计数的字段，3为增量</param>
        protected virtual void UpdateForCount(string tableName, params object[] param)
        {
            string sql = "update [{0}] set [{3}]=[{3}]+{4} where [{1}]={2}";
            List<object> listParasm = new List<object>
            {
                tableName,
                param[0],
                param[1],
                param[2],
                param[3],
            };
            db.ExecuteCommand(string.Format(sql, listParasm.ToArray()));
        }