MySQL

Data table collect (ID, title, info, VType) on these 4 fields, which title with fixed length, info with text, ID is gradual, VType is Tinyint,vtype is index. This is a simple model of the basic news system. Now fill in the data and fill in 100,000

Length: is a calculation of the lengths of a field a Chinese character is counted three characters, a number or letter is counted as a character Char_length: Whether Chinese characters or numbers or letters is a character Example: 1, you want to

Use \ \ or see how you define the string. In fact, there are only two escapes: PHP and MySQL. In PHP, if you define a string with double quotes, there is an escape here. If you use single quotes, you do not escape.$sql = "SELECT * FROM table WHERE

Create a table that holds the ID information for the record you want to delete: The code is as follows Copy Code CREATE TABLE ' Tmp_ids ' (' ID ' int (11),' Name ' char (20)) Engine=myisam; If you want to

If you are not forgetting the password to modify the MySQL password method There are many, as the following UPDATE User statement (Huitian record) This must be done by logging into MySQL with the root account and then executing: 1. If you do not

Look at its grammar first. The left JOIN keyword returns all rows from the left-hand table (TABLE_NAME1), even if the right table(table_name2) does not have a matching row. Left JOIN keyword syntax The code is as follows Copy Code

MySQL 5.5.13Parameter description: The code is as follows Copy Code [Client]Character-set-server = UTF8Port = 3306Socket =/data/mysql/3306/mysql.sock[Mysqld]Character-set-server = UTF8user = MySQLPort = 3306Socket =/data/

Commonly used statements 1, look for redundant records in the table, duplicate records are based on a single field (MAIL_ID) to judge The code is as follows Copy Code SELECT * FROM Table WHERE mail_id to (select mail_id

Method One, Using phpMyAdmin, this is the easiest, to modify the MySQL library's user table, but don't forget to use the password function. Method Two, Format: Mysqladmin-u username-P Old password password new password 1, to root add a password

Apache The code is as follows Copy Code Sudo/etc/init.d/apache2 start starts ApacheSudo/etc/init.d/apache2 Restart Restart ApacheSudo/etc/init.d/apache2 Stop Apache stopped Mysql The code is as

The simplest method of port judgment ==> only for database local useMethod for judging the 1:if condition of law The code is as follows Copy Code [Root@oldboy scripts]# Cat check_db01.sh#!/bin/sh#created by Oldboy#mail:

The first step is to see the maximum number of connections under current MySQL The code is as follows Copy Code [Root@localhost ~]#/usr/local/mysql/bin/mysqladmin-uroot-ppassword variables |grep max_connections

The Linux environment in this article is Red Hat 9.0,mysql is 4.0.16.Second, the installation of MySQL1, download the MySQL installation filesThe following two files are required to install MySQL:mysql-server-4.0.16-0.i386.rpmmysql-client-4.0.16-0.i3

Backup and Recovery For example, we want to back up the MySQL already exists in the database named Linux, to use the command mysqldump The command format is as follows: [Root@linuxsir01 root]# mysqldump-u root-p linux >/root/linux.sqlEnter

Error message#1045-Access denied for user 'root' @ 'localhost' (using password: YES)Find the config. inc. Php file in the phpmyadmin directory and modify the following location:For the config. inc. Php file, the most important thing is to modify the

Article field:Id: autoPid: the value of id is not of the auto type.Title: StringProcessing:Insert a record: Connnection conn = ...;String SQL = "insert into article values (null ,? ,?) ";// The following statements generate a PreparedStatement with

Type: 500 free super spaceDomain name: free subdomain nameFtp: Free FTP accountPhp: PHP supportData type: MySQL supportNetwork file managerEasy-to-install applicationsInstant account settingsEasy-to-use control panelStable host platformPowerful

1. Set phpMyAdminLanguage: Chinese simplified (zh-utf-8)MySQL character set: UTF-8 Unicode (utf8)MySQL connection verification gbk_chinese_ci2. When creating a databaseSet it to gbk_chinese_ci.3. Create a table using SQLENGINE = MyISAM default

Mysql php Data packaging and backup programIf (! $ Dbname ){$ Errmsg = 'Please input dbname ';} Else {Dbconn ($ dbhost, $ dbuser, $ dbpass, $ dbname, $ charset, $ dbport );If (! File_exists ($ mysqldlfile )){$ Errmsg = 'the object you want to

Class mySqlClass {// define the entire database metadata class mySqlClassVar $ querynum = 0; // variable of the number of queries // Open the connection to the server -----------------------------------------------------------------------------------