Caml 多表关联查询

Posted nigel

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using (SPSite site = new SPSite(SiteUrl))

    using (SPWeb web = site.RootWeb)
    
        SPQuery query = new SPQuery();
        //Joins属性,这里有INNER和LEFT两种方式连接,均可查询,而且支持多表连接;
        query.Joins = "<Join Type=‘INNER‘ ListAlias=‘City‘>" +
                            "<Eq>" +
                                "<FieldRef Name=‘Location‘ RefType=‘Id‘/>" +
                                "<FieldRef List=‘City‘ Name=‘ID‘/>" +
                            "</Eq>" +
                        "</Join>";
        //设置关联的查阅项字段
        query.ProjectedFields = "<Field Name=‘CustomCityID‘ Type=‘Lookup‘ " +
                                        "List=‘City‘ ShowField=‘CityID‘/>";
<Field Name=‘CustomMark‘ Type=‘Lookup‘ List=‘City‘ ShowField=‘Mark‘/>";
        //设置需要显示的字段
        query.ViewFields = "<FieldRef Name=‘Title‘/>" +
                            "<FieldRef Name=‘Location‘/>" +
                            "<FieldRef Name=‘CustomCityID‘/>";
"<FieldRef Name=‘CustomMark‘/>";

        SPList list = web.GetList(ListName);
        SPListItemCollection itemcoll = list.GetItems(query);
        foreach (SPListItem item in itemcoll)
        
            SPFieldLookupValue Location = new SPFieldLookupValue(item["Location"].ToString());
            SPFieldLookupValue CustomCityID = new SPFieldLookupValue(item["CustomCityID"].ToString());
            Console.WriteLine("ID:" + item.ID.ToString() + " Title:" + item["Title"].ToString() + " Location:" + Location.LookupValue + " CustomCityID:" + CustomCityID.LookupValue);
        
    


9、同时为代码的ProjectedFields多添加Mark的字段属性,如下图:

query.ProjectedFields =
"<Field Name=‘CustomCityID‘ Type=‘Lookup‘ List=‘City‘ ShowField=‘CityID‘/>
<Field Name=‘CustomMark‘ Type=‘Lookup‘ List=‘City‘ ShowField=‘Mark‘/>";
  10、同时为显示属性加入CustomMark字段,如下图:

query.ViewFields = "<FieldRef Name=‘Title‘/>" +
                    "<FieldRef Name=‘Location‘/>" +
                    "<FieldRef Name=‘CustomCityID‘/>" +
                    "<FieldRef Name=‘CustomMark‘/>";
  输出添加CustomMark字段的值,如下:

SPFieldLookupValue CustomMark = new SPFieldLookupValue(item["CustomMark"].ToString());
Console.WriteLine("CustomMark:" + CustomMark.LookupValue)

附:列表结构

  列表一:City

  字段:Title(默认字段,单行文本,作为Address关联的查阅项)

     CityID(数字类型,作为Address关联的查阅项)

     Mark(单行文本,作为多表查询的测试字段)

  列表二:Address

  字段:Title(默认)

     Location(查阅项,关联City列表的Title)

     CustomCityID(查阅项,关联City列表的CityID)

附:参考链接

  http://social.msdn.microsoft.com/Forums/sharepoint/zh-CN/866a49fd-0656-4a8a-9e11-36eeb4401005/sharepoint-2010-caml-list-joins

  http://msdn.microsoft.com/zh-cn/library/microsoft.sharepoint.spquery.joins.aspx

  

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