Question

我有以下搜索sql查询：

ALTER PROCEDURE [EmployeeSearch]
@PayrollNumber  varchar(50) = null,
@isInternal     bit = null,
@Firstname      varchar(50) = null,
@Surname        varchar(50) = null
AS
SET NOCOUNT ON;
Select EmployeeSearchView.*
From   EmployeeSearchView
Where
EmployeeSearchView.isInternal = @isInternal
AND 
(EmployeeSearchView.PayrollNumber LIKE '%' + @PayrollNumber + '%'
OR  EmployeeSearchView.Firstname LIKE '%' + @Firstname + '%'
OR  EmployeeSearchView.Surname LIKE '%' + @Surname + '%'

唯一的问题是当FirstName或Surname作为空字符串发送时''它返回错误的值...如果我传递空值它可以工作..我可以修复此查询吗？

谢谢！

Answer 1

你可以添加另一个和子句来检查空字符串吗？

ALTER PROCEDURE [EmployeeSearch]
@PayrollNumber  varchar(50) = null,
@isInternal             bit = null,
@Firstname              varchar(50) = null,
@Surname                varchar(50) = null
AS
SET NOCOUNT ON;
Select EmployeeSearchView.*
From   EmployeeSearchView
Where
EmployeeSearchView.isInternal = @isInternal
AND 
(EmployeeSearchView.PayrollNumber LIKE '%' + @PayrollNumber + ' %'
OR  (@Firstname <> '' AND EmployeeSearchView.Firstname LIKE '%' + @Firstname + ' %')
OR  (@Surname   <> '' AND EmployeeSearchView.Surname LIKE '%' + @Surname + ' %')

Answer 2

ALTER PROCEDURE [EmployeeSearch]
@PayrollNumber  varchar(50) = null,
@isInternal             bit = null,
@Firstname              varchar(50) = null,
@Surname                varchar(50) = null
AS
SET NOCOUNT ON;

IF (IsNull(@FirstName, '') = '') 
    SET @FirstName = '%'
ELSE
    SET @FirstName = '%' + @FirstName + '%';
END

IF (IsNull(@Surname, '') = '') 
    SET @Surname = '%'
ELSE
    SET @Surname = '%' + @Surname + '%';
END

Select EmployeeSearchView.*
From   EmployeeSearchView
Where
EmployeeSearchView.isInternal = @isInternal
AND 
(EmployeeSearchView.PayrollNumber LIKE '%' + @PayrollNumber + '%'
AND  EmployeeSearchView.Firstname LIKE @Firstname
AND EmployeeSearchView.Surname LIKE @Surname

SQL LIKE查找查询

2 个答案: