Question

我昨天发了一个问题，这是相关的。我有一个名为People_Master的表

    public class MainActivity extends Activity implements  AdapterView.OnItemSelectedListener {
      private Button validateUser;
      private Spinner userTypeSpinner;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        userTypeSpinner=(Spinner)findViewById(R.id.userTypeSpinner);
        validateUser= (Button) findViewById(R.id.userValidate);

        validateUser.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Toast.makeText(getApplicationContext(), "Button is Selected", Toast.LENGTH_SHORT);
            }
        });



        ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this,
                R.array.userTypeArray, android.R.layout.simple_spinner_item);
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        userTypeSpinner.setAdapter(adapter);
        userTypeSpinner.setOnItemSelectedListener(this);
    }

    @Override
    public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
        String item = adapterView.getItemAtPosition(i).toString();

        Toast.makeText(adapterView.getContext(), "Selected: " + item, Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onNothingSelected(AdapterView<?> adapterView) {

    }
}

我创建了另一个名为People_Delta的表

CREATE TABLE [dbo].[People_Master](
[ID] [int] IDENTITY(900001,1) NOT NULL,
[Email] [nvarchar](50) NULL,
[FirstName] [nvarchar](50) NULL,
[uac] [int] NULL,
[department] [nvarchar](50) NULL,
 CONSTRAINT [PK_People_Master] PRIMARY KEY CLUSTERED 
(
    [ID] ASC
)

请注意，我在People_Delta中还有一个名为＆＃34; change_type ＆＃34;

的列

现在我正在尝试为People_Master编写更新触发器，以便在更新发生时，它应该将整行写入People_Delta并将change_type设置为＆＃34;修改＆＃34;。

这是我写过的触发器（我不擅长SQL。大声笑！）

CREATE TABLE [dbo].[People_Delta](
[ID] [int] NOT NULL,
[Email] [nvarchar](50) NULL,
[FirstName] [nvarchar](50) NULL,
[uac] [int] NULL,
[Department] [nvarchar](50) NULL,
[change_type] [nvarchar](10) NULL
) ON [PRIMARY]

但是，当我执行此触发器时，我收到以下错误：

CREATE TRIGGER [dbo].[TR_Update] 
   ON  [dbo].[People_Master]
   AFTER Update
AS 
BEGIN
    -- SET NOCOUNT ON added to prevent extra result sets from
    -- interfering with SELECT statements.
    SET NOCOUNT ON;

    Declare @RowCount int
    Declare @ID int

    --Create a temp table to hold the inserted data.
    Declare @TempTable As Table
    (
        [ID] [int],
        [Email] [nvarchar](50) ,
        [FirstName] [nvarchar](50),
        [uac] [int] ,
        [department] [nvarchar](50)     
    )

    Insert Into @TempTable (ID,Email,FirstName,uac,department)
    select 
        ID,
        Email,
        FirstName,
        uac,
        department
    from
        inserted    


    select @ID = ID from inserted

    --check if the row for this ID doesnt exist already.
    Select @RowCount=COUNT(*) from People_Delta where People_Delta.ID = @ID and People_Delta.change_type = 'Modify';

    if(@RowCount = 0)
    Begin
        Insert into People_Delta (ID,Email,FirstName,uac,Department,change_type)
        values (@TempTable.ID,@TempTable.Email,@TempTable.FirstName,@TempTable.uac,@TempTable.department,'Modify');
    END

END

GO

我做错了什么？请帮忙！ GT

Answer 1

尝试此触发器。

更改了此插入查询

 Insert into People_Delta (ID,Email,FirstName,uac,Department,change_type)
        values (@TempTable.ID,@TempTable.Email,@TempTable.FirstName,@TempTable.uac,
                @TempTable.department,'Modify');

到

Insert into People_Delta (ID,Email,FirstName,uac,Department,change_type)
        select  ID, Email,FirstName, uac, department, 'Modify'    from
        inserted

更新了触发器：

CREATE TRIGGER [dbo].[TR_Update] 
   ON  [dbo].[People_Master]
   AFTER Update
AS 
BEGIN
    -- SET NOCOUNT ON added to prevent extra result sets from
    -- interfering with SELECT statements.
    SET NOCOUNT ON;

    Declare @ID int

    select @ID = ID from inserted

    If NOT EXISTS(Select People_Delta.ID from People_Delta where People_Delta.ID = @ID 
                       and People_Delta.change_type = 'Modify')
    BEGIN
         Insert into People_Delta (ID,Email,FirstName,uac,Department,change_type)
          select  ID, Email,FirstName, uac, department, 'Modify'    from
          inserted  
    END
END

SQL Update触发器，用于将整行写入另一个表

1 个答案: