MySQL

Process of using the database:1. Registration drive;2. Use the Drivermanager.getconnection method to obtain the Connection object con;A method:3. Use the Createstatement () method of the Connection object to get the object stmt that can execute the

Colloquial business : refers to a set of operations that are either executed successfully or not executed .----> atomicity Other sessions are not able to see the process of intermediate changes until all operations have been completed--

Index : is the directory created for the data .function : can speed up the queryNegative effect : reduce the speed of adding and deleting .Principles of Index creation :1: do not over-index2: Add on the column with the most frequent where

Error Environment:MySQL 5.0: UTF8 encodingJdbc:mysql-connector-java-5.1.5-bin.jarError in case of emoticons:Java.sql.SQLException:Incorrect string value: ' \xf0\x9f\x98\x84 ' for columnBecause the emoji in some terminals, such as ios5.0 above, is

"SELECTn1.id, N1.nav_name, N1.nav_info, N2.id iid, N2.nav_name nnav_name fromCms_nav N1 Left JOINCms_nav n2 onN1.pid=n2.idWHEREn1.id='$this->id' ORN1.nav_name='$this->nav_name'LIMIT1"The Chinese military id=26 its pid=1Find

Syntax Description:Way One:Case value when [compare_value] and then result [when [compare_value] then result ...] [ELSE result] ENDWay two:case is [condition] then result [when [condition] then result ...] [ELSE result] ENDUse the Demo sample:Mysql>

The MySQL installation under Windows is divided into installation files (installed with Windows install), and one way to register a service through Windows (or not to register a service). You start and close each time you go through the Windows

Concepts similar to functions,is to encapsulate a piece of code.,when it comes to executing this piece of code,,You can call this stored procedure to implement the.inside the encapsulated statement body,can be usedIf/else, Case,whileand other

http://hi.baidu.com/wylinux/item/cbc458c2984381300831c651 View Index CommandsMysql> Show index from Tblname;Mysql> show keys from Tblname;· TableThe name of the table.· Non_unique0 if the index cannot include a repeating word. 1 if it is possible.·

http://blog.chinaacc.com/garfiled606/blog/20100119-1909060539272.html Client connections:Go to command line, Windows cmd, connect:Mysql-u User name-p password-H server IP address-P server-side MySQL port number-D database nameAttention:(1) Server

Accidentally saw "fotolog:scaling the world\ 's largest Photo Blogging Community", only to find a lot of database optimization truth is very simple, to high level is when you face the problem, whether really made their own thinking, And not just the

1.% allow connections from any IP localhost to allow native connections2. dbfor Studio MySQL 6.2.280 % of cases, use Backup databases, pour out the SQL file, import in another database (RESTORE database) does not go in localhost, using Backup

Delete behavior is issued at 4 o'clock in the morning, Just landed during the backup, because 5.5 had MDL (Meta data Lock), so when –single-transaction, the tables that were manipulated within the transaction would hold the MDL and therefore not be

Architecture:650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M01/4D/E4/wKioL1RcK4CQT_KhAABVrSCFybE955.jpg "title=" Qq20141107101438.jpg "alt=" Wkiol1rck4cqt_khaabvrscfybe955.jpg "/>Slave#!/bin/bash#datatime= ' date -d  "Yesterday"  +%f '

1. The mainstream databaseOracleIBM DB2MySQL (acquired by Oracle)Microsoft SQL ServerSybase company SybaseUniversity of California, Berkeley, PostgreSQLOpen source && cross-platform: mysql,postgresqlCommercial && non-cross platform: SQL Server;Cross-

Installation Server installation. Use command: sudo yum-y install Mysql-server Client Installation. Use command: sudo yum-y install MySQL Set boot up Sudo/sbin/chkconfig--add mysqld Sudo/sbin/chkconfig

Transfer from http://www.jb51.net/article/36497.htm--Create a libraryCREATE TABLE ' Rate ' (' Uname ' VARCHAR (300),' Object ' VARCHAR (300),' Score ' VARCHAR (300));--Inserting dataINSERT into Test.rate (Uname, object, score)VALUES (' AAA ', '

MySQL database usage process, code explanation, mysql usage process Database usage process:1. Registration driver;2. Use DriverManager. getConnection to obtain the connection object con;Method:3. Use the createStatement () method of the connection

MYSQL stored procedures and events About the creation of stored procedures and events in mysql The following stored procedure mainly implements the function of querying the data in the table half a year ago. If yes, It stores the data in the file

Mysqlbinlog parameter settings1. mysql has many system variables that can be set. Different system variables may lead to different system running states. Therefore, mysql provides two groups of commands to view the system settings and running status.