Question

我有一个查询，用于将部门插入department表。但是，Address表中有一个名为Address_ID的外键。每当我想插入一个新部门时，我也想检查地址是否存在，如果不存在，我想创建一个新部门。如果确实存在，我想找到正确的ID并将其存储在变量中供以后使用。此变量已在代码的开头声明为BIGINT。

-- If the address already exists, we will select its ID and store it in a variable.
    BEGIN
      SET @Address_ID =
      (
        SELECT TOP 1 [Address_ID]
        FROM [Address]
        WHERE
          [Building] = @Building_Param
          AND [Factory] = @Factory_Param
      )
    END

上面的代码是更大声明的一部分。您可以在下面找到完整的代码。

此段代码失败，并显示以下错误消息：

Die @ Address_ID-Tabellenvariable muss deklariert werden。

翻译：

必须声明@Address_ID表变量。

这是完整的代码：

/**
 * Inserts a new entry into the department table.
 *
 * @author     Rubbel Die Katz
 */
DECLARE @The_Date DATETIME2
SET @The_Date = GETDATE()

DECLARE @Department_Name_Param NVARCHAR(MAX)
SET @Department_Name_Param = ?

DECLARE @Department_Description_Param NVARCHAR(MAX)
SET @Department_Description_Param = ?

DECLARE @Factory_Param NVARCHAR(MAX)
SET @Factory_Param = ?

DECLARE @Building_Param NVARCHAR(MAX)
SET @Building_Param = ?

DECLARE @Address_ID BIGINT
SET @Address_ID = 0

-- If the address does not exist, we will need to create it automagically.
IF NOT EXISTS (
    SELECT *
    FROM [Address]
    WHERE
      [Building] = @Building_Param
      AND [Factory] = @Factory_Param
)
  BEGIN
    INSERT INTO [Department] (
      [Department_Name],
      [Department_Description],
      [Time_Created],
      [Time_Modified]
    )
    OUTPUT INSERTED.[Address_ID] INTO @Address_ID
    VALUES (
      @Department_Name_Param,
      @Department_Description_Param,
      @The_Date,
      @The_Date
    )
  END
ELSE
-- If the address already exists, we will select its ID and store it in a variable.
    BEGIN
      SET @Address_ID =
      (
        SELECT TOP 1 [Address_ID]
        FROM [Address]
        WHERE
          [Building] = @Building_Param
          AND [Factory] = @Factory_Param
      )
    END

-- If the department does not exist, we will create it using the Address_ID provided by our previous operations.
IF NOT EXISTS (SELECT * FROM [Department] WHERE [Department_Name] = @Department_Name_Param)
BEGIN
  INSERT INTO [Department] (
    [Department_Name],
    [Department_Description],
    [Address_ID],
    [Time_Created],
    [Time_Modified]
  )
  VALUES (
    @Department_Name_Param,
    @Department_Description_Param,
    @Address_ID,
    @The_Date,
    @The_Date
  )
END

我正在使用的表格都是空的。

如何从表中BIGINT获取BIGINT，而不是表变量？

Answer 1

错误很明显，此处您尚未声明@Address_ID。在批处理开始时，您需要DECLARE：

DECLARE @Address_ID TABLE (AddressID BIGINT);

然后，您可以使用以下方法将该值转换为数据类型BIGINT的变量：

DECLARE @Address_ID_BI BIGINT;
SELECT @Address_ID_BI = AddressID
FROM @Address_ID;

此 ASSUMES 您只插入一个值。

Answer 2

您收到错误的原因是您没有插入地址表并获取该标识值。

如果您更改代码段：

INSERT INTO [Department] (
      [Department_Name],
      [Department_Description],
      [Time_Created],
      [Time_Modified]
    )
    OUTPUT INSERTED.[Address_ID] INTO @Address_ID
    VALUES (
      @Department_Name_Param,
      @Department_Description_Param,
      @The_Date,
      @The_Date
    )

成为：

insert into [Address] ( Building, Factory ) values ( @Building_Param, @Factory_Param ) 
set @Address_ID = ( SELECT SCOPE_IDENTITY() )

然后你将拥有插入的地址ID。

以下是易于测试的完整代码：

/**
 * Inserts a new entry into the department table.
 *
 * @author     Rubbel Die Katz
 */
DECLARE @The_Date DATETIME2
SET @The_Date = GETDATE()

DECLARE @Department_Name_Param NVARCHAR(MAX)
SET @Department_Name_Param = ?

DECLARE @Department_Description_Param NVARCHAR(MAX)
SET @Department_Description_Param = ?

DECLARE @Factory_Param NVARCHAR(MAX)
SET @Factory_Param = ?

DECLARE @Building_Param NVARCHAR(MAX)
SET @Building_Param = ?

DECLARE @Address_ID BIGINT
SET @Address_ID = 0



-- If the address does not exist, we will need to create it automagically.
IF NOT EXISTS (
    SELECT *
    FROM [Address]
    WHERE
      [Building] = @Building_Param
      AND [Factory] = @Factory_Param
)
  BEGIN
   insert into [Address] ( Building, Factory ) values ( @Building_Param, @Factory_Param ) 
    set @Address_ID = ( SELECT SCOPE_IDENTITY() )
  END
ELSE
-- If the address already exists, we will select its ID and store it in a variable.
    BEGIN
      SET @Address_ID =
      (
        SELECT TOP 1 [Address_ID]
        FROM [Address]
        WHERE
          [Building] = @Building_Param
          AND [Factory] = @Factory_Param
      )
    END

-- If the department does not exist, we will create it using the Address_ID provided by our previous operations.
IF NOT EXISTS (SELECT * FROM [Department] WHERE [Department_Name] = @Department_Name_Param)
BEGIN
  INSERT INTO [Department] (
    [Department_Name],
    [Department_Description],
    [Address_ID],
    [Time_Created],
    [Time_Modified]
  )
  VALUES (
    @Department_Name_Param,
    @Department_Description_Param,
    @Address_ID,
    @The_Date,
    @The_Date
  )
END

Answer 3

我在您的脚本中做了一些小改动。试试这个：

DECLARE @The_Date DATETIME2
SET @The_Date = GETDATE()

DECLARE @Department_Name_Param NVARCHAR(MAX)
SET @Department_Name_Param = ?

DECLARE @Department_Description_Param NVARCHAR(MAX)
SET @Department_Description_Param = ?

DECLARE @Factory_Param NVARCHAR(MAX)
SET @Factory_Param = ?

DECLARE @Building_Param NVARCHAR(MAX)
SET @Building_Param = ?

DECLARE @Address_ID BIGINT
SET @Address_ID = 0

-- If the address does not exist, we will need to create it automagically.
IF NOT EXISTS(
    SELECT 1
    FROM [Address]
    WHERE [Building] = @Building_Param
          AND [Factory] = @Factory_Param
)
  BEGIN
    INSERT INTO [Address]
    (
      [Factory],
      [Building],
      [Time_Created],
      [Time_Modified]
    )
    VALUES
      (
        @Factory_Param,
        @Building_Param_Param,
        @The_Date,
        @The_Date
      )
  END
--Else Part is Not Neccessary

SELECT @Address_ID = [Address_ID]
--Top 1 is not needed since the variable can hold only 1 value it will take only the Top 1 by Default
FROM [Address]
WHERE
  [Building] = @Building_Param
  AND [Factory] = @Factory_Param;

-- If the department does not exist, we will create it using the Address_ID provided by our previous operations.
IF NOT EXISTS(SELECT 1
              FROM [Department]
              WHERE [Department_Name] = @Department_Name_Param)
  BEGIN
    INSERT INTO [Department]
    (
      [Department_Name],
      [Department_Description],
      [Address_ID],
      [Time_Created],
      [Time_Modified]
    )
    VALUES
      (
        @Department_Name_Param,
        @Department_Description_Param,
        @Address_ID,
        @The_Date,
        @The_Date
      )
  END

将SELECT查询的结果存储在整数中并在INSERT语句中重用它

3 个答案: