Question

我的表Employee和EmployeeUpdate定义如下：

CREATE TABLE [dbo].[tblemployee](
    [id] [int] NULL,
    [name] [nchar](10) NULL,
    [salary] [int] NULL,
    [gender] [nchar](10) NULL,
    [departmentid] [int] NULL
) ON [PRIMARY]
CREATE TABLE [dbo].[tbl_employee_forinsert](
    [id] [int] NULL,
    [auditdata] [nchar](10) NULL
) ON [PRIMARY]

数据：

select * from employee

id  name    salary  gender  departmentid
1   jhon        5000    male        3
2   mike        3400    male        2
3   pam         6000    female      1
4   todd        4800    male        4
5   sara        3200    female      1
6   ben         4800    male        3
101 ram         50050   male        33
102 ram         50050   male        33

我想使用DML触发器在EmployeeUpdate中插入行，我使用此代码：

create trigger tr_tbl_employee_forinsert
  on tblemployee
  for insert
  as
  begin

        declare @id int
        select @id = id from inserted
        insert into  [tbl_employee_forinsert]
        values ('New employee with id = ' + cast (@id as nvarchar(5)) + '  is added at   '+ cast ( Getdate () as nvarchar(20)))
    end

我遇到了这个错误：

消息213，级别16，状态1，过程tr_tbl_employee_forinsert，行 9列名称或提供的值数与表不匹配定义

Answer 1

这应该有效：

create trigger tr_tbl_employee_forinsert
on tblemployee for insert as
begin

    insert into  [tbl_employee_forinsert] (id, auditdata)
    select id, 'New employee with id = ' + cast (id as nvarchar(5)) + '  is added at   '+ cast (Getdate () as nvarchar(20))
    from inserted
end

虽然你的表只能将nchar（10）存储到auditdata中，所以你也必须修复它

Answer 2

由于您已使用两列定义了表：

CREATE TABLE [dbo].[tbl_employee_forinsert](
    [id] [int] NULL,
    [auditdata] [nchar](10) NULL
) ON [PRIMARY]

您必须为两列提供值，或在insert语句中指定要插入的列。

但是，代码还有两个更严重的问题：

1.您不能select @id = id from inserted，因为插入的虚拟表包含一组数据，而不是单个项目。

2.您试图插入比列（声明为nchar(10)）更多的字符有空间，因此您需要扩展列。

假设您希望在id列中插入员工的ID，您想要的触发器可能是这样的：

create trigger tr_tbl_employee_forinsert
on tblemployee for insert as
  begin
    insert into  [tbl_employee_forinsert] (id, auditdata)
    select i.id, 'New employee with id = ' + cast (i.id as nvarchar(5)) + ' is added at ' + cast (Getdate () as nvarchar(20)))
    from inserted i
  end

在查询中你提到了一个表EmployeeUpdate，但是在定义中你有一个表tbl_employee_forinsert，我想这是你所引用的表，所以如果它不匹配则更改名称

插入的DML触发器错误：列名称或提供的值的数量与表定义不匹配

2 个答案: