如何使用代码生成器对记录进行批量修改

通用权限管理系统提供了一套代码生成器，这里介绍少如何使用其中的记录批量修改功能，

方法一：

List<KeyValuePair<string, object>> whereParameters = new List<KeyValuePair<string, object>>();
whereParameters.Add(new KeyValuePair<string, object>(QUOTEntity.FieldSITE_ID, targetSiteId));
whereParameters.Add(new KeyValuePair<string, object>(QUOTEntity.FieldFEE_TYPE, targetFeeType));
List<QUOTEntity> priceList = QUOTManager.GetList<QUOTEntity>(whereParameters);
foreach (var PntEntity in priceList)
{
 PntEntity.DeletionStateCode = 1;
 PntEntity.ModifiedBy = userInfo.RealName;
 PntEntity.ModifiedOn = DateTime.Now;
 PntEntity.ModifiedUserId = userInfo.Id;
 QUOTManager.Update(PntEntity);
}

 以上方法需要找出全部记录，逐条更新，效率不是很好。

方法二：

List<KeyValuePair<string, object>> whereParameters = new List<KeyValuePair<string, object>>();
whereParameters.Add(new KeyValuePair<string, object>(QUOTEntity.FieldSITE_ID, targetSiteId));
whereParameters.Add(new KeyValuePair<string, object>(QUOTEntity.FieldFEE_TYPE, targetFeeType));
List<KeyValuePair<string, object>> parameters = new List<KeyValuePair<string, object>>();
parameters.Add(new KeyValuePair<string, object>(QUOTEntity.FieldDeletionStateCode, 1));
parameters.Add(new KeyValuePair<string, object>(QUOTEntity.FieldModifiedBy, userInfo.RealName));
parameters.Add(new KeyValuePair<string, object>(QUOTEntity.FieldModifiedOn, DateTime.Now));
parameters.Add(new KeyValuePair<string, object>(QUOTEntity.FieldModifiedUserId, userInfo.Id));
parameters.Add(new KeyValuePair<string, object>(QUOTEntity.FieldMODIFIEDSITE, userInfo.CompanyName));
QUOTManager.SetProperty(whereParameters, parameters); 

可以看到，上面代码使用了SetProperty方法，whereParameters是条件，parameters是参数，

表示将符合条件的记录设置对应的属性。效率要比第一条高。

关于第二种方法，我们来看下其实现

       public virtual int SetProperty(KeyValuePair<string, object> whereParameter, KeyValuePair<string, object> parameter)
        {
            List<KeyValuePair<string, object>> whereParameters = new List<KeyValuePair<string, object>>();
            whereParameters.Add(whereParameter);
            List<KeyValuePair<string, object>> parameters = new List<KeyValuePair<string, object>>();
            parameters.Add(parameter);
            return DbLogic.SetProperty(DbHelper, this.CurrentTableName, whereParameters, parameters);
        }

        /// <summary>
        /// 设置属性
        /// </summary>
        /// <param name="dbHelper">数据库连接</param>
        /// <param name="tableName">目标表名</param>
        /// <param name="whereParameters">条件字段,条件值</param>
        /// <param name="parameters">更新字段,更新值</param>
        /// <returns>影响行数</returns>
        public static int SetProperty(IDbHelper dbHelper, string tableName, List<KeyValuePair<string, object>> whereParameters, List<KeyValuePair<string, object>> parameters)
        {
            SQLBuilder sqlBuilder = new SQLBuilder(dbHelper);
            sqlBuilder.BeginUpdate(tableName);
            foreach (var parameter in parameters)
            {
                sqlBuilder.SetValue(parameter.Key, parameter.Value);
            }
            sqlBuilder.SetWhere(whereParameters);
            // sqlBuilder.SetDBNow(FieldModifiedOn);
            return sqlBuilder.EndUpdate();
        }

底层自动实现了条件和设置功能的拼接，满足外部多种调用方式。其底层实现所在位置：

感兴趣的朋友可继续看下其底层实现原理，自从使用第二种方式对记录批量更新后，后台处理速度确实提高了很多。