SQL存储过程事务和优化方法（包括查询方式语句结合）

判断插入值是否重复：

CREATE PROCEDURE  IR_rb_User_UpdateUser

(

    @UserID        int,

    @Name    nvarchar(50),

    @Email           nvarchar(100),

    @Password    nvarchar(20),

    @RoleID        int,

    @iSuccess    int output

)

AS



set @iSuccess = -1    --判断是否成功有错误应为插入重复键



IF EXISTS (SELECT Email  FROM rb_Users WHERE Email = @Email and UserID<>@UserID)

BEGIN

  set @iSuccess = -2

  return

END



BEGIN TRAN



    UPDATE    rb_Users  SET    Name   = @Name,    Email    = @Email,    Password = @Password  WHERE    UserID   = @UserID



    IF @@ERROR <> 0

    BEGIN

        ROLLBACK TRAN

        return

    END

    set @iSuccess = -3



    update rb_UserRoles set RoleID=@RoleID  where UserID=@UserID



    IF @@ERROR <> 0

    BEGIN

        ROLLBACK TRAN

        return

    END



COMMIT TRAN



set @iSuccess = 1

GO

条件查询语句：

CREATE PROCEDURE IR_SysAuthorization_GetAllSysAuthorization

(

    @Type int,

    @UserID varchar(20)

)

 AS



declare     @strsql    varchar(1500)        --临时sql语句

declare     @strwhere    varchar(1000)        --临时sql的条件语句



set @strsql = ''

set @strsql = @strsql + 'select UserID,Role,(select typename from SysAuthorizationType where type=t.type) as typeTmp, '

set @strsql = @strsql + '(CASE WHEN State = 1 THEN ' + '''有效''' + ' ELSE ' + '''无效''' + ' END) AS StateTmp '

set @strsql = @strsql + 'FROM SysAuthorization t '



set @strwhere = ''





IF  @UserID <> '' 

BEGIN

    set @strwhere = @strwhere + ' and (UserID LIKE ' + '''' + '%' + @UserID + '%' + '''' + ')'

END



IF  @Type >0

BEGIN

    set @strwhere = @strwhere + ' and Type =  ' + CAST(@Type AS varchar(12))

END



if @strwhere <>''

BEGIN

    set @strsql = @strsql + ' where ' + right(@strwhere, len(@strwhere)-4)

END



--按用户名排序

set  @strsql = @strsql + ' ORDER BY Type,UserID'



exec (@strsql)

GO

 

http://hanguoji.cnblogs.com/archive/2006/05/18/403533.html