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