更新数据库表时出现错误 "Incorrect syntax near the keyword 'SET'."

Question

我正在运行以下查询无法正常工作：

create table #temp(
 tableName nvarchar(50)
)
insert into #temp
SELECT TABLE_NAME 
FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_TYPE = 'BASE TABLE'
DECLARE @name VARCHAR(50)
DECLARE @TQ VARCHAR(500)
DECLARE @ContainName VARCHAR(500)
DECLARE db_cursor CURSOR FOR  
SELECT tableName 
FROM #temp

OPEN db_cursor   
FETCH NEXT FROM db_cursor INTO @name   

WHILE @@FETCH_STATUS = 0   
BEGIN   
      select @name IF COL_LENGTH(@name,'IsDeleted') IS NOT NULL
      begin
        IF COL_LENGTH(@name,'IsActive') IS NOT NULL
        begin
            exec ('UPDATE '+@name+' SET  [IsActive] = ~[IsDeleted]')

        end      
        ELSE
        BEGIN
            exec('ALTER TABLE '+@name+' ADD IsActive bit')
            exec ('UPDATE '+@name+' SET  [IsActive] = ~[IsDeleted]')
            exec('ALTER TABLE '+@name+' ALTER COLUMN IsActive SET DEFAULT ''true''')

        END
        if exists(select * from sysobjects o inner join syscolumns c on o.id = c.cdefault inner join sysobjects t on c.id = t.id where o.xtype = 'D' and c.name = 'IsDeleted' and t.name = @name)
            begin
                set @ContainName=(select o.name from sysobjects o inner join syscolumns c on o.id = c.cdefault inner join sysobjects t on c.id = t.id where o.xtype = 'D' and c.name = 'IsDeleted' and t.name = @name)
                exec('ALTER TABLE ' + @name + ' drop constraint ' + @ContainName)
            end
        exec('ALTER TABLE '+@name+' DROP COLUMN [IsDeleted]')
      end

      FETCH NEXT FROM db_cursor INTO @name   
END   

CLOSE db_cursor   
DEALLOCATE db_cursor


drop table #temp

在我的数据库中的大多数 table 中，有两列 "IsActive" 和 "IsDeleted"，它们都有默认键约束并且类型为 BIT 我正在尝试执行以下操作：

如果列 IsDeleted 存在，则将其 IsDeleted 的负值复制到 IsActive。
如果IsDeleted列存在但IsActive不存在，则创建IsActive列，将IsDeleted的负值复制到IsActive，然后将默认键约束添加到IsDeleted列。

3.Finally 从 IsDeleted 列中删除默认值约束，然后删除该列。

我在运行上面查询数据库中的每个 table。上面的查询运行很好，并根据需要更新每个 table，但它也给我错误 'incorrect syntax near SET'

我用 4 table 创建了测试数据库。第一个 table 包含 2 列：IsActive 和 IsDeleted，第二个 Table 仅包含列 IsActive，第三个 table 仅包含列 IsDeleted，第四个 table 包含一个普通的 nvarchar 列。上面执行的时候。一切正常，但在 SET 附近出现错误 Incorrect Syntax。实际上我得到了想要的结果，但也收到了不需要的错误消息。

Answer 1

这对我有用：

DECLARE @name VARCHAR(50)
DECLARE @TQ VARCHAR(500)
DECLARE @ContainName VARCHAR(500)

DECLARE db_cursor CURSOR
FOR
    SELECT  TABLE_NAME
    FROM    INFORMATION_SCHEMA.TABLES
    WHERE   TABLE_TYPE = 'BASE TABLE'

OPEN db_cursor   
FETCH NEXT FROM db_cursor INTO @name   

WHILE @@FETCH_STATUS = 0
    BEGIN   
        IF COL_LENGTH(@name, 'IsDeleted') IS NOT NULL
            BEGIN
                IF COL_LENGTH(@name, 'IsActive') IS NOT NULL
                    BEGIN
                        EXEC ('UPDATE '+@name+' SET  [IsActive] = 1 - [IsDeleted]')
                    END      
                ELSE
                    BEGIN
                        EXEC('ALTER TABLE '+@name+' ADD IsActive bit')
                        EXEC ('UPDATE '+@name+' SET  [IsActive] = 1 - [IsDeleted]')
                        EXEC('ALTER TABLE '+@name+' ADD CONSTRAINT DF_'+@name+' DEFAULT(0) for [IsActive]')

                    END
                IF EXISTS ( SELECT  *
                            FROM    sysobjects o
                                    INNER JOIN syscolumns c ON o.id = c.cdefault
                                    INNER JOIN sysobjects t ON c.id = t.id
                            WHERE   o.xtype = 'D'
                                    AND c.name = 'IsDeleted'
                                    AND t.name = @name )
                    BEGIN
                        SET @ContainName = ( SELECT o.name
                                             FROM   sysobjects o
                                                    INNER JOIN syscolumns c ON o.id = c.cdefault
                                                    INNER JOIN sysobjects t ON c.id = t.id
                                             WHERE  o.xtype = 'D'
                                                    AND c.name = 'IsDeleted'
                                                    AND t.name = @name
                                           )
                        EXEC('ALTER TABLE ' + @name + ' drop constraint ' + @ContainName)
                    END
                EXEC('ALTER TABLE '+@name+' DROP COLUMN [IsDeleted]')
            END

        FETCH NEXT FROM db_cursor INTO @name   
    END   

CLOSE db_cursor   
DEALLOCATE db_cursor

更新数据库表时出现错误 "Incorrect syntax near the keyword 'SET'."

Getting error "Incorrect syntax near the keyword 'SET'." while Updating the db tables

sql

sql-server

sql-server-2008

sql-server-2012