SQL组合查询的存储过程写法

最进一个项目 里面有个查询的功能，它是进行组合查询的， 而且用的是存储过程写。写这样的存储过程，需要注意单引号的使用，请看本人下面的例子，假如你以后写的话 记得注意写就行：

create proc selectbyname

(

@LinkmanName VARCHAR(50)=NULL,

@LinkmanBirthday VARCHAR(50)=NULL,

@LinkmanCatalog VARCHAR(50)=NULL,

@linkmanCompany VARCHAR(50)=NULL,

@LinkmanPhoneNumber VARCHAR(50)=NULL,

@LinkmanEmail VARCHAR(50)=NULL

)

as

declare @string VARCHAR(1000) //此处需要定义长一点那个string 因为你组合起来的话，整个语句加起来的字符就很多的了。

if ( LEN(@LinkmanName)>0)

begin

if @string IS NULL

set @string='select * from linkman where lm_name like '''+@LinkmanName+ '%'''

else

set @string=@string+' and lm_name like '''+@LinkmanName+ '%'''

end

if (LEN(@LinkmanBirthday)>0)

begin

if @string IS NULL

set @string=@string+' select * from linkman where lm_birthday='''+@LinkmanBirthday+''''

else

set @string=@string+' and lm_birthday='''+@LinkmanBirthday+''''

end

if ( LEN(@LinkmanCatalog)>0)

begin

if @string IS NULL

set @string=@string +' select * from linkman where lm_catalog like ''' + @LinkmanCatalog + '%'''

else

set @string=@string +' and lm_catalog like ''' + @LinkmanCatalog + '%'''

end

if (LEN(@linkmanCompany) >0 )

begin

if @string IS NULL

set @string=@string +' select * from linkman where lm_company like '''+ @linkmanCompany + '%'''

else

set @string=@string +' and lm_company like '''+ @linkmanCompany + '%'''

end

if ( LEN(@LinkmanPhoneNumber)>0)

begin

if @string IS NULL

set @string=@string +' select * from linkman where lm_mobile ='''+@LinkmanPhoneNumber+''''

else

set @string=@string +' and lm_mobile ='''+@LinkmanPhoneNumber+''''

end

if (LEN(@LinkmanEmail)>0)

begin

if @string IS NULL

set @string=@string +' select * from linkman where lm_email='''+@LinkmanEmail+''''

else

set @string=@string +' and lm_email='''+@LinkmanEmail+''''

end

if(@string is null)

begin

set @string='select * from linkman '

end

exec( @string)

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程序界面：

SQL组合查询的存储过程写法 - 376735332 - 376735332的博客

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确定按钮代码：

private void button1_Click(object sender, EventArgs e)

{

string strProName = "selectbyname";

string conn = DBUtility.SqlHelper.connString;

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