在存储过程中如何拼接字符串参数

示例一、
declare @strWhere varchar(1000)
set @strWhere = 'cat2.CategoryName = '''+'手机'+''' and Quantity > 10' --cat2为表名

--exec dbo.UP_GetInventoryByPage 2,3, @strWhere
print(@strWhere)

示例二、
declare @Sql varchar(2000)
set @Sql = 'select * from dbo.Category'
declare @wh varchar(1000)
set @wh = '1'
if @wh = '1'

--当@wh变量值为字条串时用引号''将其括起来。
set @Sql = @Sql + ' where CategoryId =''' + @wh + '''' --结尾是四个引号
print(@Sql)
exec(@sql)

--other:

declare @Sql varchar(2000)
set @Sql = 'select * from dbo.Category'
declare @wh varchar(1000)
set @wh = '1'

当--@wh 变量值为 数字时，直接用
set @Sql = @Sql + ' where CategoryId =' + @wh
print (@Sql)

示例三:

set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
go

ALTER PROC [dbo].[UP_GetInventoryByPage]
@pageSize int,
@pageNumber int,
@strWhere varchar(1000) = '' --varchar(1000)= ''
AS
Declare @rowStart int
Declare @rowEnd int
Declare @strSql varchar(1000)

set @strSql =
'With Temp AS --用with申明一张Temp表
( SELECT InventoryID,inv.ProductID,inv.Quantity,pro.ProductName,pro.Price,cat.CategoryName,cat2.categoryName as ProductType,
ROW_NUMBER() OVER (order by InventoryID) as rowNumber
From Inventory inv inner join Product pro
on inv.productid = pro.productid
inner join category cat
on pro.categoryid = cat.categoryid
inner join category cat2
on cat.parentid = cat2.categoryid'

if @pageNumber > 0
Begin
if @strWhere <>''
begin
SET @pageNumber = @pageNumber -1
SET @rowStart = @pageSize * @pageNumber + 1;
SET @rowEnd = @rowStart + @pageSize - 1 ;
SET @strSql = @strSql +' Where '+ @strWhere + ')'+
' select *
from Temp
Where rowNumber >='+ str(@rowStart) +' and rowNumber <= '+ str(@rowEnd)
exec(@strSql)
end
else
Begin
SET @pageNumber = @pageNumber -1
SET @rowStart = @pageSize * @pageNumber + 1;
SET @rowEnd = @rowStart + @pageSize - 1 ;
Set @strSql = @strSql + ' ) '+
' select *
from Temp
Where rowNumber >= '+ str(@rowStart) +' and rowNumber <= '+str(@rowEnd) --整数的参数与字符串拼接时要转化为字符串
exec(@strSql)
END

end