Question

我正在编写一个客户搜索存储过程，其中有三个参数firstname, lastname, fathers name都是varchar

我写的如下：

CREATE PROCEDURE [dbo].[SearchCustomer] 
(  
  @p_FirstName varchar = NULL
  ,@p_LastName varchar = NULL
  ,@p_FatherFirstName varchar = NULL
)
AS 
BEGIN 
  SET NOCOUNT ON 
  SELECT [CustomerID]
        ,[CustomerTitle]
        ,[FirstName]
        ,[MiddleName]
        ,[LastName]
        ,[FatherFirstName]
        ,[EmailId]
     FROM [Customer] 
       WHERE [FirstName] LIKE COALESCE(@p_FirstName,'%')     
      OR [LastName] LIKE COALESCE @p_LastName,'%')
      OR [FatherFirstName] LIKE COALESCE(@p_FatherFirstName,'%')
  END

我正在使用可选参数，因为如果没有参数值，我需要在没有任何条件的情况下获得完整列表，但是当我只给出第一个名称时，我只需要那些匹配该条件的行而不是其余的，但现在它的列表全部< / p>

我猜这个问题就在OR附近

你能帮忙吗？

如果我将OR更改为AND

现在如果我把名字作为'abc'和姓氏和父亲名字黑......

我正在获取所有列表，包括'abc'作为名字..

我只需要名字为'abc'的行而不是其余的

Answer 1

这将根据提交的参数过滤行：

CREATE PROCEDURE [dbo].[SearchCustomer] 
(  
  @p_FirstName varchar(50) = NULL
 ,@p_LastName varchar(50) = NULL
 ,@p_FatherFirstName varchar(50) = NULL
)
AS 
BEGIN 

  SET NOCOUNT ON 
  SELECT [CustomerID]
        ,[CustomerTitle]
        ,[FirstName]
        ,[MiddleName]
        ,[LastName]
        ,[FatherFirstName]
        ,[EmailId]
     FROM [Customer] 
   WHERE [FirstName] LIKE COALESCE(@p_FirstName + '%', FirstName)     
   AND [LastName] LIKE COALESCE (@p_LastName + '%', LastName)
   AND [FatherFirstName] LIKE COALESCE(@p_FatherFirstName + '%', FatherFirstName)
  END
GO

Answer 2

使用where子句，如下例所示。

 WHERE (@p_FirstName=''  or [FirstName] LIKE COALESCE(@p_FirstName,'%'))     
      OR (@p_LastName='' or [LastName] LIKE COALESCE @p_LastName,'%'))
      OR (@p_FatherFirstName='' or [FatherFirstName] LIKE COALESCE(@p_FatherFirstName,'%'))

并使用以下语法设置所有参数''（如果它们为NULL）。

SET @p_FirstName=ISNULL(@p_FirstName,'')

Answer 3

CREATE PROCEDURE [dbo].[SearchCustomer]  
(   
  @p_FirstName varchar = NULL 
  ,@p_LastName varchar = NULL 
  ,@p_FatherFirstName varchar = NULL 
) 
AS  
BEGIN  
  SET NOCOUNT ON  
  SELECT [CustomerID] 
        ,[CustomerTitle] 
        ,[FirstName] 
        ,[MiddleName] 
        ,[LastName] 
        ,[FatherFirstName] 
        ,[EmailId] 
     FROM [Customer]  
       WHERE [FirstName] LIKE COALESCE(@p_FirstName,'%')      
       OR (FirstName is NULL
      AND [LastName] LIKE COALESCE(@p_LastName,'%') 
      AND [FatherFirstName] LIKE COALESCE(@p_FatherFirstName,'%'))
  END

Answer 4

CREATE PROCEDURE [dbo].[SearchCustomer] 
(  
  @p_FirstName varchar(50) = NULL
  ,@p_LastName varchar(50) = NULL
  ,@p_FatherFirstName varchar(50) = NULL
)
AS 
BEGIN 
SET NOCOUNT ON 

SELECT  [CustomerID]
        ,[CustomerTitle]
        ,[FirstName]
        ,[MiddleName]
        ,[LastName]
        ,[FatherFirstName]
        ,[EmailId]
FROM    [Customer] 
WHERE   ([FirstName] = @p_FirstName OR @p_FirstName IS NULL)
    AND ([LastName] = @p_LastName OR @p_LastName IS NULL)
    AND ([FatherFirstName] = @p_FatherFirstName OR @p_FatherFirstName IS NULL)

END

客户搜索存储过程

4 个答案: