在创建表后调用insert时出现"无效的列名"错误

Question

我正在使用SSMS开发SQL脚本,它在数据库中进行了一些更改:

USE MyDatabase;

BEGIN TRANSACTION;

-- some statements

PRINT(N'#1');

IF (EXISTS (SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA = N'dbo' AND TABLE_NAME = N'Table1' AND COLUMN_NAME = 'Table2_Id'))
BEGIN
    ALTER TABLE [dbo].[Table1] DROP CONSTRAINT [FK_Table1_Table2_Table2_Id];
    ALTER TABLE [dbo].[Table1] DROP COLUMN [Table2_Id];
    DROP TABLE [dbo].[Table2];

    PRINT(N'Table2 was dropped.');
END

PRINT(N'#2');

IF (NOT EXISTS (SELECT * FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA = N'dbo' AND TABLE_NAME = N'Table2'))
BEGIN
    CREATE TABLE [dbo].[Table2]
    (
        [Id] INT NOT NULL PRIMARY KEY IDENTITY,
        [Number] INT NOT NULL UNIQUE,
        [Name] NVARCHAR(200) NOT NULL,
        [RowVersion] TIMESTAMP NOT NULL
    );
PRINT(N'Table2 was re-created.');
    INSERT INTO [dbo].[Table2]([Number], [Name]) VALUES(-1, N'Default value');
PRINT(N'Default value was inserted in Table2.');
END

-- some statements

COMMIT TRANSACTION;

如果Table1有一个名为column的列,Table2_Id那么database有两个表(Table1和Table2)以及它们之间的外键关系.在这种情况下,我需要:

• 放弃外键关系FK_Table1_Table2_Table2_Id;
• 删掉外键列Table1.Table2_Id;
• 下降Table2;
• Table2使用新的表模式重新创建;
• 在中插入一些默认值Table2.

当我尝试执行此脚本时,我收到以下错误:

消息207,级别16,状态1,行262无效的列名称"数字".
消息207,级别16,状态1,行262无效的列名称"名称".

看起来SQL Server使用旧的模式Table2(实际上没有这些列),但如果表刚刚使用新模式创建,这怎么可能？

我究竟做错了什么？

服务器版本是SQL Server 2012(SP1) - 11.0.3128.0(X64).

更新.

我添加了PRINT调用(参见上面的脚本).消息窗口中没有任何内容,除了错误消息.所以,脚本没有被执行......发生了什么？

Answer 1

SQL Server尝试编译整个批处理.如果表已经存在,那么它将根据预先存在的定义进行编译.引用新列的语句不会编译,因此批处理永远不会执行.

您需要使用新定义将语句分组到新批处理中.如果您在SSMS中运行它,只需插入一个GO

USE MyDatabase;

BEGIN TRANSACTION;

-- some statements

PRINT(N'#1');

IF (EXISTS (SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA = N'dbo' AND TABLE_NAME = N'Table1' AND COLUMN_NAME = 'Table2_Id'))
BEGIN
    ALTER TABLE [dbo].[Table1] DROP CONSTRAINT [FK_Table1_Table2_Table2_Id];
    ALTER TABLE [dbo].[Table1] DROP COLUMN [Table2_Id];
    DROP TABLE [dbo].[Table2];

    PRINT(N'Table2 was dropped.');
END

GO

PRINT(N'#2');

IF (NOT EXISTS (SELECT * FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA = N'dbo' AND TABLE_NAME = N'Table2'))
BEGIN
    CREATE TABLE [dbo].[Table2]
    (
        [Id] INT NOT NULL PRIMARY KEY IDENTITY,
        [Number] INT NOT NULL UNIQUE,
        [Name] NVARCHAR(200) NOT NULL,
        [RowVersion] TIMESTAMP NOT NULL
    );
PRINT(N'Table2 was re-created.');
    INSERT INTO [dbo].[Table2]([Number], [Name]) VALUES(-1, N'Default value');
PRINT(N'Default value was inserted in Table2.');
END

COMMIT

否则,您可以在子批处理中运行违规行

    EXEC(N'INSERT INTO [dbo].[Table2]([Number], [Name]) VALUES(-1, N''Default value'');')