Home Database Mysql Tutorial 获取数据库所有表名与字段名

获取数据库所有表名与字段名

Jun 07, 2016 pm 02:59 PM
Field database Obtain Table Name

1. 获取所有数据库名 : Select Name FROM Master..SysDatabases 2. 获取所有表名 : select name from sysobjects where type='U' XType='U': 表示所有用户表 ; XType='S': 表示所有系统表 ; 3. 获取所有字段名 : Select Name from SysColumns Where id=Objec

1.获取所有数据库名:

Select Name FROM Master..SysDatabases

 

2.获取所有表名:

select name from sysobjects where type='U'

XType='U':表示所有用户表;

XType='S':表示所有系统表;

 

3.获取所有字段名:

Select Name from SysColumns Where id=Object_Id('TableName')  

 

 

 

获取当前数据库表名:

select name from sysobjects where xtype='U'and name'dtproperties'

 

获取当前表的字段名及属性:

select a.name, b.xtype,b.name

from syscolumns a

inner  JOIN systypes  b

ON a.xtype=b.xusertype

inner join sysobjects c ON

a.id=c.id AND c.xtype='U' AND c.name'dtproperties' where c.name = 表名

 

或:

 

SELECT

表名   = CASE a.colorder WHEN 1 THEN c.name ELSE '' END,

     = a.colorder,

字段名 = a.name,

标识   = CASE COLUMNPROPERTY(a.id,a.name,'IsIdentity') WHEN 1 THEN '' ELSE '' END,

主键   = CASE

WHEN EXISTS (

SELECT *

FROM sysobjects

WHERE xtype='PK' AND name IN (

SELECT name

FROM sysindexes

WHERE id=a.id AND indid IN (

SELECT indid

FROM sysindexkeys

WHERE id=a.id AND colid IN (

SELECT colid

FROM syscolumns

WHERE id=a.id AND name=a.name

)

)

)

)

THEN ''

ELSE ''

END,

类型   = b.name,

字节数 = a.length,

长度   = COLUMNPROPERTY(a.id,a.name,'Precision'),

小数   = CASE ISNULL(COLUMNPROPERTY(a.id,a.name,'Scale'),0)

WHEN 0 THEN ''

ELSE CAST(COLUMNPROPERTY(a.id,a.name,'Scale') AS VARCHAR)

END,

允许空 = CASE a.isnullable WHEN 1 THEN '' ELSE '' END,

默认值 = ISNULL(d.[text],''),

说明   = ISNULL(e.[value],'')

FROM syscolumns a

LEFT  JOIN systypes      b ON a.xtype=b.xusertype

INNER JOIN sysobjects    c ON a.id=c.id AND c.xtype='U' AND c.name'dtproperties'

LEFT  JOIN syscomments   d ON a.cdefault=d.id

LEFT  JOIN sysproperties e ON a.id=e.id AND a.colid=e.smallid

ORDER BY c.name, a.colorder

回答者: alby - 魔法师 五级   2006-7-26 11:51

我找到并在ACCESS里测试通过了:

ACCESS里,备注类型用Memo表示,所以改变字段的数据类型为备注的SQL为:

ALTER TABLE user ALTER COLUMN userinfo Memo

对了,如果user表有外键,而且你要修改的字段就是外键的话,你就不能修改啦!

下面给出修改为其它类型的SQL(表为tb,字段为aa):

ALTER TABLE tb ALTER COLUMN aa Byte 数字[字节]

ALTER TABLE tb ALTER COLUMN aa Long 数字[长整型]

ALTER TABLE tb ALTER COLUMN aa Short 数字[整型]

ALTER TABLE tb ALTER COLUMN aa Single 数字[单精度

ALTER TABLE tb ALTER COLUMN aa Double 数字[双精度]

ALTER TABLE tb ALTER COLUMN aa Currency 货币

ALTER TABLE tb ALTER COLUMN aa Char 文本

ALTER TABLE tb ALTER COLUMN aa Text(n) 文本,其中n表示字段大小

ALTER TABLE tb ALTER COLUMN aa Binary 二进制

ALTER TABLE tb ALTER COLUMN aa Counter 自动编号

ALTER TABLE tb ALTER COLUMN aa Memo 备注

ALTER TABLE tb ALTER COLUMN aa Time 日期/时间

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

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

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)

Where to get Google security code Where to get Google security code Mar 30, 2024 am 11:11 AM

Google Authenticator is a tool used to protect the security of user accounts, and its key is important information used to generate dynamic verification codes. If you forget the key of Google Authenticator and can only verify it through the security code, then the editor of this website will bring you a detailed introduction on where to get the Google security code. I hope it can help you. If you want to know more Users please continue reading below! First open the phone settings and enter the settings page. Scroll down the page and find Google. Go to the Google page and click on Google Account. Enter the account page and click View under the verification code. Enter your password or use your fingerprint to verify your identity. Obtain a Google security code and use the security code to verify your Google identity.

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

How does Hibernate implement polymorphic mapping? How does Hibernate implement polymorphic mapping? Apr 17, 2024 pm 12:09 PM

Hibernate polymorphic mapping can map inherited classes to the database and provides the following mapping types: joined-subclass: Create a separate table for the subclass, including all columns of the parent class. table-per-class: Create a separate table for subclasses, containing only subclass-specific columns. union-subclass: similar to joined-subclass, but the parent class table unions all subclass columns.

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.

An in-depth analysis of how HTML reads the database An in-depth analysis of how HTML reads the database Apr 09, 2024 pm 12:36 PM

HTML cannot read the database directly, but it can be achieved through JavaScript and AJAX. The steps include establishing a database connection, sending a query, processing the response, and updating the page. This article provides a practical example of using JavaScript, AJAX and PHP to read data from a MySQL database, showing how to dynamically display query results in an HTML page. This example uses XMLHttpRequest to establish a database connection, send a query and process the response, thereby filling data into page elements and realizing the function of HTML reading the database.

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.

See all articles