crm使用FetchXml聚合查询

/* 创建者：菜刀居士的博客

* 创建日期：2014年07月08号

*/

namespace Net.CRM.FetchXml

{

using System;

using Microsoft.Xrm.Sdk;

using Microsoft.Xrm.Sdk.Query;

/// <summary>

/// 使用FetchXml聚合查询

/// </summary>

public class FetchXmlDemo

{

/* 特别提示：FetchXML 包含使您可以计算总和、平均值、最小值、最大值和计数的分组和聚合函数。

* 在查询中仅仅能指定一个 aggregate 属性，并且不能使用 distinct keyword。要创建的聚合的属性。

* 请设置keywordaggregate到true，然后指定有效的实体名称。 属性名称，和别名 （变量名）。

* 同一时候必须指定要运行的聚合的类型。

*/

/// <summary>

/// 总和

/// sql: select sum(new_value) as 'new_value_sum' from account

/// </summary>

public void Sum(IOrganizationService service)

{

string fetchXml = @"<fetch distinct='false' mapping='logical' aggregate='true'>

<entity name='account'>

<attribute name='new_value' alias='new_value_sum' aggregate='sum' />

</entity>

</fetch>";

EntityCollection ec = service.RetrieveMultiple(new FetchExpression(fetchXml));

if (ec != null && ec.Entities.Count > 0)

{

Entity en = ec.Entities[0];

//获取结果

decimal value = ((Money)((AliasedValue)en["new_value_sum"]).Value).Value;

}

}

/// <summary>

/// 平均值

/// sql: select avg(new_value) as 'new_value_avg' from account

/// 当crm计算数据的平均值时，不考虑 Null 值。

可是。会使用零 (0)。

/// </summary>

public void Avg(IOrganizationService service)

{

string fetchXml = @"<fetch distinct='false' mapping='logical' aggregate='true'>

<entity name='account'>

<attribute name='new_value' alias='new_value_avg' aggregate='avg' />

</entity>

</fetch>";

EntityCollection ec = service.RetrieveMultiple(new FetchExpression(fetchXml));

if (ec != null && ec.Entities.Count > 0)

{

Entity en = ec.Entities[0];

//获取结果

decimal value = ((Money)((AliasedValue)en["new_value_avg"]).Value).Value;

}

}

/// <summary>

/// 计算有多少个记录

/// sql: select count(*) from account

/// </summary>

public void Count(IOrganizationService service)

{

string fetchXml = @"<fetch distinct='false' mapping='logical' aggregate='true'>

<entity name='account'>

<attribute name='new_name' alias='new_name_count' aggregate='count' />

</entity>

</fetch>";

EntityCollection ec = service.RetrieveMultiple(new FetchExpression(fetchXml));

if (ec != null && ec.Entities.Count > 0)

{

Entity en = ec.Entities[0];

//获取结果

int value = (Int32)((AliasedValue)en["new_name_count"]).Value;

}

}

/// <summary>

/// 计算有多少个记录(针对指定的列名)

/// sql: select count(distinct new_name) from account

/// </summary>

public void CountColumn(IOrganizationService service)

{

string fetchXml = @"<fetch distinct='false' mapping='logical' aggregate='true'>

<entity name='account'>

<attribute name='new_name' alias='new_name_count' aggregate='countcolumn' distinct='true' />

</entity>

</fetch>";

EntityCollection ec = service.RetrieveMultiple(new FetchExpression(fetchXml));

if (ec != null && ec.Entities.Count > 0)

{

Entity en = ec.Entities[0];

//获取结果

int value = (Int32)((AliasedValue)en["new_name_count"]).Value;

}

}

/// <summary>

/// 最大值

/// sql: select max(new_value) as 'new_value_max' from account

/// 当crm计算数据的最大值时，不考虑 Null 值。可是，会使用零 (0)。

/// </summary>

public void Max(IOrganizationService service)

{

string fetchXml = @"<fetch distinct='false' mapping='logical' aggregate='true'>

<entity name='account'>

<attribute name='new_value' alias='new_value_max' aggregate='max' />

</entity>

</fetch>";

EntityCollection ec = service.RetrieveMultiple(new FetchExpression(fetchXml));

if (ec != null && ec.Entities.Count > 0)

{

Entity en = ec.Entities[0];

//获取结果

decimal value = ((Money)((AliasedValue)en["new_value_max"]).Value).Value;

}

}

/// <summary>

/// 最小值

/// sql: select min(new_value) as 'new_value_min' from account

/// 当crm计算数据的最小值时，不考虑 Null 值。可是。会使用零 (0)。

/// </summary>

public void Min(IOrganizationService service)

{

string fetchXml = @"<fetch distinct='false' mapping='logical' aggregate='true'>

<entity name='account'>

<attribute name='new_value' alias='new_value_min' aggregate='min' />

</entity>

</fetch>";

EntityCollection ec = service.RetrieveMultiple(new FetchExpression(fetchXml));

if (ec != null && ec.Entities.Count > 0)

{

Entity en = ec.Entities[0];

//获取结果

decimal value = ((Money)((AliasedValue)en["new_value_min"]).Value).Value;

}

}

/// <summary>

/// 多个聚合

/// sql: select count(*) as 'new_value_count',max(new_value) as 'new_value_max',

/// min(new_value) as 'new_value_min' from account

/// </summary>

public void CountAndMaxAndMin(IOrganizationService service)

{

string fetchXml = @"<fetch distinct='false' mapping='logical' aggregate='true'>

<entity name='account'>

<attribute name='new_value' alias='new_value_count' aggregate='count' />

<attribute name='new_value' alias='new_value_max' aggregate='max' />

<attribute name='new_value' alias='new_value_min' aggregate='min' />

</entity>

</fetch>";

EntityCollection ec = service.RetrieveMultiple(new FetchExpression(fetchXml));

if (ec != null && ec.Entities.Count > 0)

{

Entity en = ec.Entities[0];

//获取结果

int count_value = (Int32)((AliasedValue)en["new_value_count"]).Value;

decimal max_value = ((Money)((AliasedValue)en["new_value_max"]).Value).Value;

decimal min_value = ((Money)((AliasedValue)en["new_value_min"]).Value).Value;

}

}

}

}