我正在尝试使用以下查询检索一些数据，并且我想对其进行参数化。
select Col A,Col B,Col C,Col D
From TableA
where (COL A like '01%' or COL A like '02%')
我正在使用以下查询，但没有得到输出。
declare @p1 varchar ='01%',
@p2 varchar ='02%'
select Col A,Col B,Col C,Col D
From TableA
where (COL A like @p1 or COL A like @p2)
请建议如何使用 sql server 2008r2 参数化上述查询的更好方法。
谢谢
The problem is that you did not specify a length for your parameters, and they are being resolved as varchar(1). You could see this with debugging 101, e.g.
DECLARE @p1 VARCHAR = '01%';
SELECT p1 = @p1, lenp1 = DATALENGTH(@p1);
Result:
p1 lenp1
---- -----
0 1
Try:
DECLARE @p1 VARCHAR(32) = '01%',
@p2 VARCHAR(32) = '02%';
...
Please be explicit instead of lazy. Also use semi-colons to terminate statements.