MySQL

Qt connection to MySQL is a simple matter, but it can be very simple.QT gave us the hint only QMYSQL driver not loaded , let us have no clue. Accessing other databases can also be addressed in the same way.QT Access MySQL requires 2 dynamic link

The first two days of the project database to be ported to MySQL, for this temporary catch a few days long useless MySQL.The company's database is relatively simple, migrating from Oracle to MySQL is simple, but the middle of the privilege

0. Display Databaseshow databases;1. Select DatabaseUse database name;2. Display the tables in the databaseShow tables;3, display the structure of the data tabledescribe table name;4. Display the records in the tableSELECT * from table name;5. Build

1. master node Authorized synchronization User 2. master node Modify configuration file 3. Modifying a configuration file from a node 4. View status after the primary node is locked 5. Configure and initiate synchronization, view

If you move to "/home/mysql/data", my MySQL is installed under/usr/local/mysql1. Move the/usr/local/mysql/data to the/home/mysql/dataMV /usr/local/mysql/data/home/mysql/data2. Modify the Startup fileVI

(1) Full-scale backup: Backup of all data in the databaseMysqldump-u root-p-f-b-A |gzip >/server/backup/mysqlbak_$ (date +%f). sql.gz Backup format: mysqlbak_2016-04-19.sql.gzmysq Ldump-u root-p-f-b-A |gzip >/server/backup/mysqlbak_$ (date + "%d-%m-%

The way to modify the character set is to use the MySQL command mysql> SET character_set_client = UTF8; mysql> SET character_set_connection = UTF8; use mysql> show VARIABLES like ' character% '; view, discover that database encoding has been changed

Slow query: SQL statements that exceed the set time are recorded in the specified file1. Watch MySQL Slow query default time (default 10 seconds)Show variables like ' long% ';2, modify the slow query set timeSet long_query_time=1;3. Check if MySQL

PrefaceThere are three ways to install MySQL: RPM installation, binary package installation, source package installation. These 3 various ways each have the characteristic, the main characteristic refer to the following table. In real-world

Begindeclare ID long;declare done int default 0;declare cashamount DECIMAL (10,2) default 0.00;declare scorecamount INT DEF Ault 0;declare userids CURSOR for SELECT userid from info_user where isreal = 1;declare CONTINUE HANDLER for SQLSTATE ' 020

One. Close WEKAIf the WEKA is open, be sure to close it before you can do the following. Otherwise, errors may occur after the configuration is complete.Two. Get MySQL driverCreate the Lib folder under the Weka installation directory and place the

Header ("Content-type:text/html;charset=utf-8");$link =mysqli_connect (' localhost ', ' ye ', '); localhost can use 127.0.0.1 instead of MySQL link named ye password nullmysqli_select_db ($link, ' test '); Select the database is the link name the

MySQL Master-slave replicationPrimary server ip:192.168.99.10From server ip:192.168.99.20(i) Install MySQL (same as master server operation)Yum-y Install gcc gcc-c++ ncurses-develAdd groups and Users#/usr/sbin/groupadd MySQL#/usr/sbin/useradd-g

First, MySQL installation and basic configuration1 Installing CMake #./configure#make &&make Install2 Installing MySQL# yum Install ncurses* bison*#

MySQL read-write separationStatic Detach: Writes the server address directly to the programDynamic separation: Through the proxy server to read and write data, the proxy server to determine the read and write operations, on the primary server

#! /bin/bash# v.mysql-5.6.30-linux-glibc2.5-x86_64.tar.gz# only install master  Mysql# time:2016-08-15# pkg dirpkg_dir= ' pwd ' # mysql base dirdata_dir= "/data/ Mysql_root/mysql "base_dir="/usr/local/mysql "# create mysql group and userecho " Start 

1: Under the terminal:mysql-v. Here is the code snippet:$ mysql-vMySQL Ver 14.7 distrib 4.1.10a, for Redhat-linux-gnu (i686)2: In MySQL:mysql> status;Here is the code snippet:mysql> status;--------------MySQL Ver 14.7 distrib 4.1.10a, for

Preliminary understanding of MySQL gap locksPreliminary understanding of MySQL gap locks I first recognized MySQL's gap and thought this design was quite unique. It was not the same as other databases, so I sorted out a simple memo (although there

Yundun practices MySQL series tutorial (4) [7 years of experience in flash sales LowB engineer] Master-slave replication and Backup Recovery Solution Production Environment practice, mysqllowb Article 1: MySQL series of tutorials (I) production

MySQL full and Incremental backup, based on xtrabackup 2.3.5, xtrabackup2.3.5 Yesterday, a pgp encryptor broke down and lost everything... my notes! How can I achieve 2 .. Back up a script so that you can check it on your phone later. I almost