存储过程，游标和触发器实例

--使用游标循环处理，删除重复的记录
    declare @UserID int
    declare @UserName varchar(32)
    declare @RealName varchar(32)
    declare @UnitFlag int
    declare @Email2 varchar(64)
    declare @Mobile varchar(64)
    declare @Start int
    declare @End int
    declare @Type varchar(16)
    declare @IsSubscribe bit
    declare curEmailTotalLib cursor
    for (select UserID,UserName,RealName,UnitFlag,Email,Mobile,IsSubscribe from Task_IntermediateData)
    open curEmailTotalLib                --打开游标
    fetch next from curEmailTotalLib into @UserID, @UserName, @RealName, @UnitFlag, @Email2, @Mobile, @IsSubscribe
    while @@fetch_status = 0   --获取成功
    begin
        --在邮件系统总库中不存在此用户ID，不存在此邮箱，并且用户订阅过
        if not exists(select * from Task_EmailTotalLib where UserID = @UserID)
            and not exists(select * from Task_EmailTotalLib where Email = @Email2)
            and @IsSubscribe = 1
        begin
            set    @Start = charindex(‘@‘, @Email2, 0)
            set @End = charindex(‘.‘, @Email2, @Start)
            if  @Start != 0 and @End != 0
                begin
                    --不是垃圾邮件
                    if @Email2 is not null and ltrim(rtrim(@Email2)) <> ‘‘
                    begin
                        if not exists(select * from Task_JunkEmail where Email = @Email2)
                        begin
                            begin try
                                set    @Type = substring(@Email2, @Start + 1, @End - @Start - 1)
                                if @Type != ‘qq‘ and @Type!=‘126‘ and @Type != ‘163‘ and @Type!=‘sina‘
                                    and @Type !=‘sohu‘ and @Type != ‘gmail‘ and @Type!=‘hotmail‘ and
                                    @Type != ‘yahoo‘ and @Type != ‘139‘ and @Type != ‘263‘ and 
                                    @Type !=‘yeah‘ and @Type != ‘cnki‘
                                begin
                                    set    @Type = ‘extra‘
                                end
                                insert into Task_EmailTotalLib(UserID, UserName, RealName, Email, Mobile,
                                Priority, MailType, LibType, FpIsSend, CpIsSend, UpIsSend, VpIsSend, WpIsSend,
                                XpIsSend, YpIsSend, ZpIsSend, SendCount, SucCount, FailCount, CreditRate, IsJunkEmail,
                                IsSubscribe, IsUsed, Memo) values(@UserID, @UserName, @RealName, @Email2, @Mobile,
                                2, @Type, @UnitFlag, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 10, 0, @IsSubscribe, 0, ‘‘)
                            end try
                            begin catch
                                print ‘@Email2:‘+@Email2+‘charindex(‘‘@‘‘, @Email2, 0)‘+charindex(‘@‘, @Email2, 0)+‘  @Start‘+@Start+‘  @End‘+@End+‘  @End - @Start - 1:‘+@End - @Start - 1
                            end catch
                        end
                    end
                end
        end
        fetch next from curEmailTotalLib into @UserID, @UserName, @RealName, @UnitFlag, @Email2, @Mobile, @IsSubscribe
    end
    close curEmailTotalLib            --关闭游标
    deallocate curEmailTotalLib        --释放游标