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  • 记录sql server 的批量删除主外键的sql语句

    select b.name TableName,a.name TypeName,a.* from sysobjects a inner join sysobjects b on a.parent_obj=b.id and b.xtype='U'
    
    
    --删除约束  F外键、PK主键、D 约束、UQ 唯一约束
    declare @tableName varchar(max),@typeName varchar(max)
    declare fk_cursor cursor for select b.name TableName,a.name TypeName from sysobjects a inner join sysobjects b on a.parent_obj=b.id and b.xtype='U' where a.xtype='PK'
    
    open fk_cursor
    
    fetch next from fk_cursor into @tableName,@typeName
    while @@FETCH_STATUS = 0
    begin 
        exec ('ALTER TABLE [dbo].['+@tableName+'] DROP CONSTRAINT ['+@typeName+']')
        fetch next from fk_cursor into @tableName,@typeName
    end
    close fk_cursor
    deallocate fk_cursor
    select b.name TableName,a.name IndexName from sys.sysindexes a right join sys.sysobjects b on a.id=b.id where b.xtype='U' and a.name is not null
    
    --删除IX 索引
    declare @tableName varchar(max),@indexName varchar(max)
    declare index_cursor cursor for select b.name TableName,a.name IndexName from sys.sysindexes a right join sys.sysobjects b on a.id=b.id where b.xtype='U' and a.name is not null
    
    open index_cursor
    
    fetch next from index_cursor into @tableName,@indexName
    while @@FETCH_STATUS = 0
    begin 
        exec ('DROP INDEX ['+@indexName+'] ON [dbo].['+@tableName+']')
        fetch next from index_cursor into @tableName,@indexName
    end
    close index_cursor
    deallocate index_cursor
    
    
    
    select b.name TableName,a.name ColumnName,a.* from syscolumns a 
    inner join sysobjects b on b.id=a.id and b.xtype='U'
    inner join systypes c on a.xtype=c.xtype and c.name='uniqueidentifier'
    
    --修改uniqueidentifier的类型为nvarchar(max)
    declare @tableName varchar(max),@columnName varchar(max)
    declare change_type_cursor cursor for select b.name TableName,a.name ColumnName from syscolumns a 
    inner join sysobjects b on b.id=a.id and b.xtype='U'
    inner join systypes c on a.xtype=c.xtype and c.name='uniqueidentifier'
    
    open change_type_cursor
    fetch next from change_type_cursor into @tableName,@columnName
    while @@FETCH_STATUS =0
    begin
        exec ('ALTER TABLE [dbo].['+@tableName+'] ALTER COLUMN ['+@columnName+'] nvarchar(max) NOT NULL')
        fetch next from change_type_cursor into @tableName,@columnName
    end
    close change_type_cursor
    deallocate change_type_cursor
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  • 原文地址:https://www.cnblogs.com/dazen/p/13307105.html
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