mssql中修改字段默认值default value

作者：袖梨 2022-06-29

1、取得数据库所有表的默认值：

代码如下

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t3.name as 表名,t1.name as 字段名,t2.text as 默认值 ,t4.name

from syscolumns t1,syscomments t2,sysobjects t3 ,sysobjects t4

where t1.cdefault=t2.id and t3.xtype=’u’ and t3.id=t1.id

and t4.xtype=’d’ and t4.id=t2.id;

2、生成删除所有默认值的语句：

代码如下

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select “ALTER TABLE ” + t3.name + ” DROP CONSTRAINT ” +t4.name +”;”

from syscolumns t1,syscomments t2,sysobjects t3 ,sysobjects t4

where t1.cdefault=t2.id and t3.xtype=’u' and t3.id=t1.id

and t4.xtype=’d' and t4.id=t2.id ;

3、生成批量添加所有默认值的语句：

代码如下

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select “alter table ” + t3.name + “ add default (1) for ” +t1.name +”;”

from syscolumns t1,syscomments t2,sysobjects t3 ,sysobjects t4

where t1.cdefault=t2.id and t3.xtype=’u' and t3.id=t1.id

and t4.xtype=’d' and t4.id=t2.id ;

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