declare @TableName nvarchar(250)--定义当前操作的数据表名变量set @TableName=
--SQL批量删除指定数据表中的所有字段说明属性
--现象:执行select * from sys.extended_properties where value is null;显示出多条记录类似于[1 OBJECT_OR_COLUMN 2372069 1 MS_Description NULL]
--操作:执行delete from sys.extended_properties where value is null;提示[不允许对系统目录进行即席更新]
--功能说明:因为错误的操作将到了字段描述为NULL添加到系统数据表sys.extended_properties中,最终需要批量删除掉后再添加字段描述
declare @TableName nvarchar(250)--定义当前操作的数据表名变量
set @TableName='user'--指定要查询的数据表名称(此处的数据表名user需要更新为你的数据库中的已有数据表名)
declare @ColumnName nvarchar(250)--游标中的当前查询的字段名称
declare @ColumnDescription nvarchar (250)--游标中的当前查询的字段说明
--声明读取数据表中所有字段说明的游标
declare mycursor cursor for select a.name,CAST(g.value AS nvarchar) from sys.columns a left join sys.extended_properties g on (a.object_id = g.major_id AND a.column_id=g.minor_id) where object_id=OBJECT_ID(''+@TableName+'') order by object_id,a.column_id
--打开游标
open mycursor
--从游标里取出数据赋值到约束名称变量中
fetch next from mycursor into @ColumnName,@ColumnDescription
--如果游标执行成功
while (@@fetch_status=0)
begin
if(@ColumnDescription is null)
begin
print '当前数据表['+@TableName+']字段['+@ColumnName+']对应的说明为空'
--删除字段的描述属性值为NULL的记录
--EXEC sp_dropextendedproperty 'MS_Description','user',dbo,'table','数据表名称', 'column','字段名称'
EXEC sp_dropextendedproperty 'MS_Description','user',dbo,'table',@TableName,'column',@ColumnName
end
else
begin
--查询当前找到的字段说明
print '当前数据表['+@TableName+']字段['+@ColumnName+']对应的说明是['+@ColumnDescription+']'
end
--用游标去取下一条记录
fetch next from mycursor into @ColumnName,@ColumnDescription
end
--关闭游标
close mycursor
--撤销游标
deallocate mycursor

本篇文章给大家带来了关于SQL的相关知识,其中主要介绍了SQL Server使用CROSS APPLY与OUTER APPLY实现连接查询的方法,文中通过示例代码介绍的非常详细,下面一起来看一下,希望对大家有帮助。

本篇文章给大家带来了关于SQL server的相关知识,其中主要介绍了SQL SERVER没有自带的解析json函数,需要自建一个函数(表值函数),下面介绍关于SQL Server解析/操作Json格式字段数据的相关资料,希望对大家有帮助。

如何优化sql中的orderBy语句?下面本篇文章给大家介绍一下优化sql中orderBy语句的方法,具有很好的参考价值,希望对大家有所帮助。

monacoeditor创建//创建和设置值if(!this.monacoEditor){this.monacoEditor=monaco.editor.create(this._node,{value:value||code,language:language,...options});this.monacoEditor.onDidChangeModelContent(e=>{constvalue=this.monacoEditor.getValue();//使value和其值保持一致i

本篇文章给大家带来了关于SQL server的相关知识,开窗函数也叫分析函数有两类,一类是聚合开窗函数,一类是排序开窗函数,下面这篇文章主要给大家介绍了关于SQL中开窗函数的相关资料,文中通过实例代码介绍的非常详细,需要的朋友可以参考下。

monacoeditor创建//创建和设置值if(!this.monacoEditor){this.monacoEditor=monaco.editor.create(this._node,{value:value||code,language:language,...options});this.monacoEditor.onDidChangeModelContent(e=>{constvalue=this.monacoEditor.getValue();//使value和其值保持一致i

当某些sql因为不知名原因堵塞时,为了不影响后台服务运行,想要给sql增加执行时间限制,超时后就抛异常,保证后台线程不会因为sql堵塞而堵塞。一、yml全局配置单数据源可以,多数据源时会失效二、java配置类配置成功抛出超时异常。importcom.alibaba.druid.pool.DruidDataSource;importcom.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceBuilder;importorg.apache.

0x01前言概述小编又在MySQL中发现了一个Double型数据溢出。当我们拿到MySQL里的函数时,小编比较感兴趣的是其中的数学函数,它们也应该包含一些数据类型来保存数值。所以小编就跑去测试看哪些函数会出现溢出错误。然后小编发现,当传递一个大于709的值时,函数exp()就会引起一个溢出错误。mysql>selectexp(709);+-----------------------+|exp(709)|+-----------------------+|8.218407461554972


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

PhpStorm Mac version
The latest (2018.2.1) professional PHP integrated development tool

Dreamweaver Mac version
Visual web development tools

SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.

DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software

MinGW - Minimalist GNU for Windows
This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.
