Home Database Mysql Tutorial SQLServer 实用语法大全

SQLServer 实用语法大全

Jun 07, 2016 pm 03:51 PM
sqlserver Encyclopedia practical grammar Enter

欢迎进入Windows社区论坛,与300万技术人员互动交流 >>进入 14、游标 /* * 声明游标: * DECLARE 游标名 CURSOR FOR T_SQL; * *打开游标: *OPEN 游标名 * *关闭游标: *CLOSE 游标名 * *删除游标: *DEALLOCATE 游标名 * *游标读取数据: *FETCH NEXT FROM 游标

欢迎进入Windows社区论坛,与300万技术人员互动交流 >>进入

 

  14、游标

  /*

  * 声明游标:

  * DECLARE 游标名 CURSOR FOR T_SQL;

  *

  *打开游标:

  *OPEN 游标名

  *

  *关闭游标:

  *CLOSE 游标名

  *

  *删除游标:

  *DEALLOCATE 游标名

  *

  *游标读取数据:

  *FETCH NEXT FROM 游标名

  *(或者)Fetch FIRST from 游标名

  */

  --声明游标

  DECLARE deleteTable CURSOR FOR

  SELECT ltrim(rtrim(NAME)) FROM Sysobjects WHERE NAME LIKE '%000079'

  --打开游标

  OPEN deleteTable

  --关闭游标

  CLOSE deleteTable

  --删除游标

  DEALLOCATE deleteTable

  --读取数据

  FETCH NEXT FROM deleteTable INTO @Value1,@Value2

  --或则 Fetch first from mycursor

  --判断游标是否存在 deleteTable:游标名

  if cursor_status('global','deleteTable')=-3 and cursor_status('local','deleteTable')=-3

  print '不存在'

  else

  print '存在'

  CREATE PROC PROC_EA

  AS

  BEGIN

  DECLARE EAMCMT4 CURSOR FOR

  SELECT TOP 545 UserId,CreateTime FROM EA_MCMT4 ORDER BY CreateTime DESC

  DECLARE @UserId nchar(50), @DateTime smallDatetime, @Id int

  SET @Id = 560

  OPEN EAMCMT4

  WHILE @@FETCH_STATUS = 0

  BEGIn

  FETCH NEXT FROM EAMCMT4 INTO @UserId,@DateTime

  UPDATE EA SET userId=@UserId,[DateTime]= @DateTime WHERE Id=@Id

  SET @Id = @Id + 1

  END

  CLOSE EAMCMT4

  DEALLOCATE EAMCMT4

  END

  GO

  --清空日志

  DUMP TRANSACTION DBName WITH NO_LOG

  --收缩数据库文件

  DBCC SHRINKFILE('dazhou_Log',1)

  /*

  *由此推导出SQLserver分页语句

  *pageSize: 每页显示数据条数

  *TableName:查询表名

  *pageIndex:分页索引(默认为1,即首页)

  *pageCount: 总页数

  */

  IF pageIndex > 0 AND pageIndex

  BEGIN

  SELECT TOP pageSize * FROM TableName tn WHERE tn.ID NOT IN(

  SELECT TOP (pageIndex-1)*pageSize tn.ID FROM TableName tn ORDER BY tn.ID ASC)

  ORDER BY tn.ID ASC

  END

  ELSE

  BEGIN

  SELECT TOP pageSize * FROM TableName

  END

  [1] [2] [3] 

SQLServer 实用语法大全

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 Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. Best Graphic Settings
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. How to Fix Audio if You Can't Hear Anyone
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌

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)

How to solve the problem that the object named already exists in the sqlserver database How to solve the problem that the object named already exists in the sqlserver database Apr 05, 2024 pm 09:42 PM

For objects with the same name that already exist in the SQL Server database, the following steps need to be taken: Confirm the object type (table, view, stored procedure). IF NOT EXISTS can be used to skip creation if the object is empty. If the object has data, use a different name or modify the structure. Use DROP to delete existing objects (use caution, backup recommended). Check for schema changes to make sure there are no references to deleted or renamed objects.

How to import mdf file into sqlserver How to import mdf file into sqlserver Apr 08, 2024 am 11:41 AM

The import steps are as follows: Copy the MDF file to SQL Server's data directory (usually C:\Program Files\Microsoft SQL Server\MSSQL\DATA). In SQL Server Management Studio (SSMS), open the database and select Attach. Click the Add button and select the MDF file. Confirm the database name and click the OK button.

What to do if the sqlserver service cannot be started What to do if the sqlserver service cannot be started Apr 05, 2024 pm 10:00 PM

When the SQL Server service fails to start, here are some steps to resolve: Check the error log to determine the root cause. Make sure the service account has permission to start the service. Check whether dependency services are running. Disable antivirus software. Repair SQL Server installation. If the repair does not work, reinstall SQL Server.

How to check sqlserver port number How to check sqlserver port number Apr 05, 2024 pm 09:57 PM

To view the SQL Server port number: Open SSMS and connect to the server. Find the server name in Object Explorer, right-click it and select Properties. In the Connection tab, view the TCP Port field.

Where is the sqlserver database? Where is the sqlserver database? Apr 05, 2024 pm 08:21 PM

SQL Server database files are usually stored in the following default location: Windows: C:\Program Files\Microsoft SQL Server\MSSQL\DATALinux: /var/opt/mssql/data The database file location can be customized by modifying the database file path setting.

How to recover accidentally deleted database in sqlserver How to recover accidentally deleted database in sqlserver Apr 05, 2024 pm 10:39 PM

If you accidentally delete a SQL Server database, you can take the following steps to recover: stop database activity; back up log files; check database logs; recovery options: restore from backup; restore from transaction log; use DBCC CHECKDB; use third-party tools. Please back up your database regularly and enable transaction logging to prevent data loss.

Practical tips for converting full-width English letters into half-width form Practical tips for converting full-width English letters into half-width form Mar 26, 2024 am 09:54 AM

Practical tips for converting full-width English letters into half-width forms. In modern life, we often come into contact with English letters, and we often need to input English letters when using computers, mobile phones and other devices. However, sometimes we encounter full-width English letters, and we need to use the half-width form. So, how to convert full-width English letters to half-width form? Here are some practical tips for you. First of all, full-width English letters and numbers refer to characters that occupy a full-width position in the input method, while half-width English letters and numbers occupy a full-width position.

How to delete sqlserver if the installation fails? How to delete sqlserver if the installation fails? Apr 05, 2024 pm 11:27 PM

If the SQL Server installation fails, you can clean it up by following these steps: Uninstall SQL Server Delete registry keys Delete files and folders Restart the computer

See all articles