MySQL

Database stored ProceduresDrop PROCEDURE Generate_serial_number; CREATE PROCEDURE generate_serial_number (in Param_key varchar (a), in Param_orgid Int., out result int) begin START TRAN saction; Select number+1 into result from Sys_serial_number

Objective Because of the recent use of MySQL database, but the company's server and business is limited, so only a single MySQL. So, the problem is obvious, if this MySQL is broken, it will affect the entire company's business, so consider

A junction is the most important operation that can be performed with a select of SQL. In order to improve the effectiveness of storage and avoid data redundancy, it is often possible to store the associated data in several tables, so how can you

For a table that has already been created, although the data type of the field determines the type of data that can be stored, the data stored in the table is not checked for legality.MySQL-Supported integrity constraints: The value of the

Read/write Lock:. Table-level Lock: Low overhead, lock fast, no deadlock, lock granularity, lock conflict is the highest probability, concurrency is the lowest. Row-level locks: high overhead, slow locking, deadlock, minimum lock

[Plain]View Plaincopy # wget http://repo.mysql.com/mysql-community-release-el7-5.noarch.rpm --http://repo.mysql.com/mysql-community-release-el7-5.noarch.rpmParsing host repo.mysql.com (repo.mysql.com) ... 23.4.241.142Connecting

Under the Linux system, the following are the methods for viewing the compiler parameters of Nginx, Apache, MySQL, and PHP.1, nginx compilation parameters:Your_nginx_dir/sbin/nginx-v2, Apache compilation parameters:Cat

Deal1, query whether the lock tableShow OPEN TABLES where In_use > 0;Viewing transactions that are being lockedSELECT * from INFORMATION_SCHEMA. Innodb_locks;View transactions waiting for a lockSELECT * from INFORMATION_SCHEMA. Innodb_lock_waits;2.

Note: In a production environment, you need to have dirty data in the database, clear the table data, and preserve the data structure.Steps:With tools SQLyogI. Export the database structure650) this.width=650; "src=" Http://s2.51cto.com/wyfs02/M01/86

The project is based on: THINKCMF, the new demand is the number of articles in each column statisticsSQL is simple, grouping by Category ID First, then counting the number of different article states by caseSELECTT.NAME,T.PARENT,T.TERM_ID,Count(1)

1. LoginMysql-uroot-hlocalhost-pEnter Password: * * *2. View all libraries, use corresponding libraries, create a libraryshow databases;Use SYS;Create DATABASE Database;3. View the tableShow tables;4. Create a tableCREATE TABLE student ( int

Originally thought directly to the data folder for each database corresponding folder to the new MySQL Data folder can be, it is not.There are several problems with this:1. If you use the engine's table, you also need to copy the Ibdata file, and

View MySQL Run processMysql>show processlist;To view the InnoDB engine operating conditions:Mysql>show engine InnoDB Status\gTo view MySQL parameter conditions:mysql>show [Global] variables like '%innodb% ';To view MySQL running status:mysql>show

Syntax structure:Mysql_connect (Servername,username,password); Parameters Description ServerName Optional. Specifies the server to connect to. The default is "localhost:3306". Username

1 , the system has no self-brought MySQL : Yum List installed | grep mysql , If there is already, execute the command yum-y remove mysql-libs.x86_64 Uninstall the MySQL that is already installed .  http://dev.mysql.com/downloads/mysql/ 2 , first

1. When using the set in (X,x ... The parameters can be single or multiple when they are single:Findbyids (list IDs), or Findbyids (Long [] IDs)SelectFrom Jria where ID inOpen= "(" separator= "," close= ")" >#{item}collection= "Array" when an array

Create a new test table in the database T_user, containing three fields ' ID ', ' name ', ' Grilfriend ', the field is easy to see, this is the record of a person's girlfriend's table, note here the ' firlfriend ' field can be a multi-person name,

In the previous article, when extracting SQL statements from the log, I ran into a sentence of SQL that was not extracted across n rows. Later on the web search for two shells:Sed-n '/^insert/,/;/p ' log.sql > Log_insert.sqlSed-n '/^update/,/;/p '

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SQL statements are used to modify, add, delete, and modify attributes (MySql) and sqlmysql Method 1: Directly (manually) modify the database name, database table name, database column name, and column attribute   Method 2: Use SQL statements to