Information_Schema.Definition的View_definition.视图限制为4000个字符

Question

我正在通过运行此查询来备份所有视图，并将结果存储在表中：

select 
   TABLE_CATALOG as DBName
 , TABLE_NAME as ViewName
 , VIEW_DEFINITION as ViewDef
 , datalength(VIEW_DEFINITION) as [Length]
 , GETDATE() as ImportDate 
from INFORMATION_SCHEMA.VIEWS
order by DBName, ViewName

但是，view_definition列的数据类型设置为nvarchar(4000(，我的某些视图比这更长 - 因此它们截断了。

information_schema.views中的列

我可以将View_definition列的数据类型更改为Varchar(Max(以某种方式？

Answer 1

因为Information_schema.Views是您可以运行EXEC sp_helptext 'information_schema.views'的视图以查找定义。这返回

CREATE VIEW INFORMATION_SCHEMA.VIEWS
AS
    SELECT DB_NAME() AS TABLE_CATALOG ,
           SCHEMA_NAME(schema_id) AS TABLE_SCHEMA ,
           name AS TABLE_NAME ,
           CONVERT(NVARCHAR(4000), OBJECT_DEFINITION(object_id)) AS VIEW_DEFINITION ,
           CONVERT(VARCHAR(7) ,
                   CASE with_check_option
                        WHEN 1 THEN 'CASCADE'
                        ELSE 'NONE'
                   END) AS CHECK_OPTION ,
           'NO' AS IS_UPDATABLE
    FROM   sys.views;

从那里编辑以获取所需的东西

SELECT  
 DB_NAME() AS DBName,  
 name  AS ViewName,  
 OBJECT_DEFINITION(object_id)  AS ViewDef,  
 LEN(OBJECT_DEFINITION(object_id)) AS [Length],
 GETDATE() AS ImportDate
FROM  
 sys.views