标签：tar varchar 重用 tcp english query parameter cts 匿名
执行计划，查询类别：
1.即席查询 2.预定义查询
select c.EnglishProductCategoryName,p.EnglishProductName,p.Color,p.Size from Product as p inner join ProductCategory as c on p.ProductSubcategoryKey= c.ProductCategoryKey where p.Size>‘1‘
--查询执行计划是否被缓存 select c.usecounts,c.size_in_bytes,c.objtype,t.text from sys.dm_exec_cached_plans as c cross apply sys.dm_exec_sql_text(c.plan_handle) as t dbcc freeproccache--清空执行计划
--没有join 的形式会生成简单参数化 select EnglishProductName,Color,Size from Product where size>‘1‘--简单参数化
select EnglishProductName,Color,Size from Product where size>‘2‘--简单参数化
select c.EnglishProductCategoryName,p.EnglishProductName,p.Color,p.Size from Product as p inner join ProductCategory as c on p.aProductSubcategoryKey= c.ProductCategoryKey where p.Size>‘2‘
语句一样时即席查询才会重用执行计划。
优化：打开开关
exec sp_configure ‘show advanced options‘,1 reconfigure with override
为ad hoc的查询优化：
exec sp_configure ‘Optimize for ad hoc workloads‘,1 reconfigure with override
--使用参数化 alter database HRDB set Parameterization forced
set Parameterization forced 强制参数化（like无法识别 ）
select c.EnglishProductCategoryName,p.EnglishProductName,p.Color,p.Size from Product as p inner join ProductCategory as c on p.ProductSubcategoryKey= c.ProductCategoryKey where p.Size>‘2‘ select c.EnglishProductCategoryName,p.EnglishProductName,p.Color,p.Size from Product as p inner join ProductCategory as c on p.ProductSubcategoryKey= c.ProductCategoryKey where p.Size like ‘2%‘
预定义查询：
预定义查询--参数化执行计划：
存储过程：
1.创建时延时检查
2.第一次执行时编译并生成执行计划
3.减少网络传输量
4.封装变化点
5.增强安全性，隔离访问控制
创建存储过程：
create procedure p_querycp @size varchar(500) as select c.EnglishProductCategoryName,p.EnglishProductName,p.Color,p.size from Product as p inner join ProductCategory as c on p.ProductSubcategoryKey=c.ProductCategoryKey where p.Size>@size
做跟踪(以前有对应得截图)：
执行存储过程：
create procedure p_querycp @size varchar(500) as select c.EnglishProductCategoryName,p.EnglishProductName,p.Color,p.size from Product as p inner join ProductCategory as c on p.ProductSubcategoryKey=c.ProductCategoryKey where p.Size>@size --清空执行计划 dbcc freeproccache --执行 exec p_querycp ‘1‘
执行重复的语句：
dbcc freeproccache exec p_querycp @size=‘1‘ exec p_querycp @size=‘2‘
查看缓存计划：
select c.usecounts,c.size_in_bytes,c.objtype,t.text from sys.dm_exec_cached_plans as c cross apply sys.dm_exec_sql_text(c.plan_handle) as t
预定义查询---参数化执行计划：
SP_ExecuteSql
避免了自己维护存储过程管理成本
可重用执行计划
Unicode字符串作为参数值与类型
大小写敏感
把存储过程定义成传递参数的：
declare @sqltext nvarchar(500) set @sqltext=N‘ select c.EnglishProductCategoryName,p.EnglishProductName,p.Color,p.size from Product as p inner join ProductCategory as c on p.ProductSubcategoryKey=c.ProductCategoryKey where p.Size>@size ‘ declare @params nvarchar(500) set @params=N‘@size varchar(500)‘ exec sp_executesql @sqltext,@params,@size=‘1‘
把size 的大小换成 2
在.net中调用：（两种写法）
public object getCp(string size)
{
HRUser dbcontext = new HRUser();
var cps = from p in dbcontext.Product
join c in dbcontext.ProductCategory
on p.ProductSubcategoryKey equals c.ProductCategoryKey
where p.Size == size
//返回匿名对象
select new
{
CName = c.EnglishProductCategoryName,
PName = p.EnglishProductName,
Color = p.Color,
Size = p.Size
};
return cps.ToList();
}
public object getcp(string size)
{
HRUser dbcontext = new HRUser();
var cps = dbcontext.Product.Join(dbcontext.ProductCategory, a => a.ProductSubcategoryKey, ar => ar.ProductCategoryKey, (a, ar) => new
{
CName = ar.EnglishProductCategoryName,
PName = a.EnglishProductName,
Color = a.Color,
Size = a.Size
}).Where(p => p.Size == size);
return cps.ToList();
}
页面：
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<asp:Button ID="Button2" runat="server" OnClick="Button2_Click" Text="显示产品" />
<asp:GridView ID="GridView1" runat="server">
</asp:GridView>
点击后的事件：
protected void Button2_Click(object sender, EventArgs e)
{
Product p = new Product();
var cps = p.getCp(TextBox1.Text.Trim());
GridView1.DataSource = cps;
GridView1.DataBind();
}
标签：tar varchar 重用 tcp english query parameter cts 匿名
原文地址：http://www.cnblogs.com/sunliyuan/p/6260414.html
