c# - SQLDatasource 中的静态 WHERE 子句

Question

我需要根据要在运行时传递的 Businessunit 值执行查询。如果businessunit 为null，则不应执行AND 条件，如果它不为null，我必须采用通过的businessunit。

// SQL 查询

SELECT nvrEmpCode, nvrEmpName 
FROM tblHRIMS_EmployeeDetail
WHERE (intCategoryID NOT IN (0, 1)) AND (nvrResigned = 'No') 
AND nvrBusinessunit=

所有这些都必须在 SQLDatasource 中完成，而不是作为 StoredProcedure。如何做到这一点？

Answer 1

你的WHERE情况应该是这样的：

WHERE (intCategoryID NOT IN (0, 1)) AND (nvrResigned = 'No') 
AND (@businessunit IS NULL OR nvrBusinessunit=@businessunit)

Answer 2

假设您使用的是 SQL 客户端：

SELECT nvrEmpCode, nvrEmpName 
FROM tblHRIMS_EmployeeDetail
WHERE (intCategoryID NOT IN (0, 1)) AND (nvrResigned = 'No') 
AND (nvrBusinessunit=@BU OR @BU is null)

然后你必须为参数传递一个值：

command.Parameters.AddWithValue(@BU, yourValue)

Answer 3

SELECT        nvrEmpCode, nvrEmpName, @Businessunit AS varchar

FROM            tblHRIMS_EmployeeDetail
WHERE        (intCategoryID NOT IN (0, 1)) AND (nvrResigned = 'No') 
AND (nvrBusinessUnit = (CASE WHEN @Businessunit = '' THEN nvrBusinessunit ELSE @Businessunit END))