Home Database Mysql Tutorial sql server在多个数据库间快速查询某个表的信息

sql server在多个数据库间快速查询某个表的信息

Jun 07, 2016 pm 03:06 PM
server sql information Multiple fast database Inquire

欢迎进入Windows社区论坛,与300万技术人员互动交流 >>进入 最近出来实习,所在公司的服务器有十几个数据库,为了方便根据某个数据表的 表名 快速找到对应的数据库,又复习了一下游标的知识,写了下面这个sql代码,方便自己的工作。 1.先了解一下系统存储过程和系

欢迎进入Windows社区论坛,与300万技术人员互动交流 >>进入

  最近出来实习,所在公司的服务器有十几个数据库,为了方便根据某个数据表的 表名 快速找到对应的数据库,又复习了一下游标的知识,写了下面这个sql代码,方便自己的工作。

  1.先了解一下系统存储过程和系统表的使用,简单介绍一下我用到的几个系统存储过程(资料参考网络)

  use master --切换到系统数据库,因为下面用到的系统存储过程和系统表大部分存在于该数据库

  go

  exec sp_helpdb --查询 当前 服务器的所有数据库

  select [name] from [sysdatabases] --查询 当前 服务器的所有数据库

  select * from sysobjects where type = 'u'--列出 当前 数据库里所有的表名

  select * from information_schema.tables --列出 当前 数据库里所有的表名(执行对比一下与上面这个语句的查询结果)

  select * from syscolumns where id = object_id('spt_fallback_db') --列出指定表里的所有的信息,包括字段等等(根据需要修改参数)

  2.直接上代码(具体请参考注释,纯属学习,有错请指出)

  use master --切换到系统数据库,因为下面用到的 系统存储过程和系统表 大部分存在于该数据库

  go

  ------------------在当前服务器 根据表的名字 在多个数据库进行查询 得到哪个数据库存在该表的信息------------------

  declare @DataBaseName nvarchar(max) --定义变量(数据库的名字)

  declare cur cursor for select [name] from [sysdatabases] --定义游标,该游标指向 当前 服务器上的所有数据库名字列表

  open cur --打开游标

  create table #TableInfo (table_catalog nvarchar(max),table_schema nvarchar(max),table_name nvarchar(max),table_type nvarchar(max)) --创建临时表用于存储所有数据库的所有表信息

  fetch next from cur into @DataBaseName --获取游标的数据,相当于获取数据库名字列表的第一条数据

  while (@@fetch_status=0)

  begin

  print ''

  print ''

  print '当前数据库: '+ @DataBaseName --读出每个数据库的名字

  insert into #TableInfo --把存储过程查询出来的数据插进临时表

  exec('select table_catalog,table_schema,table_name,table_type from ' + @DataBaseName + '.information_schema.tables') --查询对应数据库的所有表

  print '--------------------------------------------------------------------------------------------------------------------------------------'

  fetch next from cur into @DataBaseName --游标移动

  end

  close cur --关闭游标

  deallocate cur --释放游标

  print ''

  print ''

  print ''

  print ''

  print ''

  declare @TableName nvarchar(max)

  set @TableName = 'MyTableName' --查询条件(根据需要自行修改)

  if exists(select table_name from #TableInfo where table_name = @TableName) --查询指定名字的表

  begin

  print '====================当前服务器存在 ' + @TableName + ' 表,相关信息请到结果窗口查看===================='

  select table_catalog as '所属数据库',table_name as '表名' from #TableInfo where table_name = @TableName --输出表的相关信息,从这些信息就可以知道这个表在哪个数据库

  end

  else

  begin

  print '--------------------当前服务器不存在 ' + @TableName + ' 表--------------------'

  end

  drop table #TableInfo --删除临时表

sql server在多个数据库间快速查询某个表的信息

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

iOS 18 adds a new 'Recovered' album function to retrieve lost or damaged photos iOS 18 adds a new 'Recovered' album function to retrieve lost or damaged photos Jul 18, 2024 am 05:48 AM

Apple's latest releases of iOS18, iPadOS18 and macOS Sequoia systems have added an important feature to the Photos application, designed to help users easily recover photos and videos lost or damaged due to various reasons. The new feature introduces an album called "Recovered" in the Tools section of the Photos app that will automatically appear when a user has pictures or videos on their device that are not part of their photo library. The emergence of the "Recovered" album provides a solution for photos and videos lost due to database corruption, the camera application not saving to the photo library correctly, or a third-party application managing the photo library. Users only need a few simple steps

Detailed tutorial on establishing a database connection using MySQLi in PHP Detailed tutorial on establishing a database connection using MySQLi in PHP Jun 04, 2024 pm 01:42 PM

How to use MySQLi to establish a database connection in PHP: Include MySQLi extension (require_once) Create connection function (functionconnect_to_db) Call connection function ($conn=connect_to_db()) Execute query ($result=$conn->query()) Close connection ( $conn->close())

How to handle database connection errors in PHP How to handle database connection errors in PHP Jun 05, 2024 pm 02:16 PM

To handle database connection errors in PHP, you can use the following steps: Use mysqli_connect_errno() to obtain the error code. Use mysqli_connect_error() to get the error message. By capturing and logging these error messages, database connection issues can be easily identified and resolved, ensuring the smooth running of your application.

How to connect to remote database using Golang? How to connect to remote database using Golang? Jun 01, 2024 pm 08:31 PM

Through the Go standard library database/sql package, you can connect to remote databases such as MySQL, PostgreSQL or SQLite: create a connection string containing database connection information. Use the sql.Open() function to open a database connection. Perform database operations such as SQL queries and insert operations. Use defer to close the database connection to release resources.

How to use database callback functions in Golang? How to use database callback functions in Golang? Jun 03, 2024 pm 02:20 PM

Using the database callback function in Golang can achieve: executing custom code after the specified database operation is completed. Add custom behavior through separate functions without writing additional code. Callback functions are available for insert, update, delete, and query operations. You must use the sql.Exec, sql.QueryRow, or sql.Query function to use the callback function.

How to handle database connections and operations using C++? How to handle database connections and operations using C++? Jun 01, 2024 pm 07:24 PM

Use the DataAccessObjects (DAO) library in C++ to connect and operate the database, including establishing database connections, executing SQL queries, inserting new records and updating existing records. The specific steps are: 1. Include necessary library statements; 2. Open the database file; 3. Create a Recordset object to execute SQL queries or manipulate data; 4. Traverse the results or update records according to specific needs.

PHP connections to different databases: MySQL, PostgreSQL, Oracle and more PHP connections to different databases: MySQL, PostgreSQL, Oracle and more Jun 01, 2024 pm 03:02 PM

PHP database connection guide: MySQL: Install the MySQLi extension and create a connection (servername, username, password, dbname). PostgreSQL: Install the PgSQL extension and create a connection (host, dbname, user, password). Oracle: Install the OracleOCI8 extension and create a connection (servername, username, password). Practical case: Obtain MySQL data, PostgreSQL query, OracleOCI8 update record.

How to save JSON data to database in Golang? How to save JSON data to database in Golang? Jun 06, 2024 am 11:24 AM

JSON data can be saved into a MySQL database by using the gjson library or the json.Unmarshal function. The gjson library provides convenience methods to parse JSON fields, and the json.Unmarshal function requires a target type pointer to unmarshal JSON data. Both methods require preparing SQL statements and performing insert operations to persist the data into the database.

See all articles