SPQuery 查询知多少

string beginTime = txtFormDate.Text.Trim();//开始时间(用户选择)--查询条件
            string endTime = txtToDate.Text.Trim();//结束时间(用户选择)--查询条件
            string prodNum = txtProdNum.Text.Trim();//商品编码(用户填写)--查询条件
            string shopName = txtShopName.Text.Trim();//门店名称(用户填写)--查询条件
            string queryStr = string.Empty;
            query = new SPQuery();
            if (beginTime.Length > 0 && endTime.Length > 0)
            {
                queryStr += string.Format(@"<And><Geq><FieldRef Name='SubmitDate'/><Value Type='DateTime'>{0}</Value></Geq>
                                                <Leq><FieldRef Name='SubmitDate'/><Value Type='DateTime' >{1}</Value></Leq></And>", beginTime, endTime);
            }
            if (beginTime.Length > 0 && endTime.Length <= 0)
            {
                queryStr += string.Format("<Geq><FieldRef Name='SubmitDate'/><Value Type='DateTime' >{0}</Value></Geq>", beginTime);
            }
            if (beginTime.Length <= 0 && endTime.Length > 0)
            {
                queryStr += string.Format("<Leq><FieldRef Name='SubmitDate'/><Value Type='DateTime' >{0}</Value></Leq>",endTime);
            }
            if (prodNum.Length > 0)
            {
                queryStr += string.Format("<Eq><FieldRef Name='ProdNum'/><Value Type='Text'>{0}</Value></Eq>", prodNum);
            }
            if (shopName.Length > 0)    
            {
                queryStr += string.Format("<Eq><FieldRef Name='ShopName'/><Value Type='Text'>{0}</Value></Eq>", shopName);
            }
query.Query = string.Format("<Where>{0}</Where>", queryStr);

SPQuery查询语句是以XML格式展现出来的,如下面的例子

<Query>
  <OrderBy>
    <FieldRef Name="Modified" Ascending="FALSE"></FieldRef>
  </OrderBy>
  <Where>
    <Or>
      <Neq>
        <FieldRef Name="Status"></FieldRef>  //字段名
        <Value Type="Text">Completed</Value> //字段值
      </Neq>
      <IsNull>
        <FieldRef Name="Status"></FieldRef>
      </IsNull>
    </Or>
  </Where>
</Query>

现在我用大家熟悉的SQL语法来和它做个比较

SPQuery	SQL
<Where></Where>	Where
<OrderBy></OrderBy>	Order By
<And></And>	And
<Or></Or>	Or
<Eq></Eq>	=
<Geq></Geq>	>=
<Gt></Gt>	>
<Leq></Leq>	<=
<Lt></Lt>	<
<Neq></Neq>	!=