MySQL

Create and delete indexes The creation of the primer can be done in the CREATE TABLE statement, or you can add indexes to the table separately with the CREATE INDEX or ALTER TABLE. The deletion index can be implemented using ALTER TABLE or DROP

Today, a classmate gave me a response, there is a table, ID is the primary key, so that the wording can return a record: The code is as follows Copy Code "SELECT * FROM T has id=min (ID);" But instead of

Recently encountered such a problem, in the MySQL stored procedure, the cursor operation, you need to perform a conitnue operation. As we all know, there are three kinds of cursor loops in MySQL, loop,repeat,while three loops, the same way. Never

Today, when you import the stored procedure to MySQL, the error is as follows: You are *might* want to use the less safe log_bin_trust_function_creators variableTo handle this problem, just go into MySQL and enter: Solutions Search in My.ini

Some tests were done on MySQL some time ago, and some test data were obtained. On the Internet to see some of the relevant summary of MySQL, and can not blindly believe, or need to look at the data to speak. The following test cases insert 10

One is to use like/not like,The second is to use Regexp/not REGEXP (or Rlike/not rlike, they are synonyms). First: Standard SQL pattern matching. It has 2 wildcard characters: "_" and "%". "_" matches any single character, and "%" matches any

Package Com.etc.entity;import Java.sql.connection;import Java.sql.preparedstatement;import java.sql.ResultSet; Import Java.sql.sqlexception;import java.sql.savepoint;import Org.junit.test;import com.etc.utils.jdbcutil;public Class TransactionDemo1 {/

MySQL Installation documentation (official yum install Linx version)creation time:2016-12-20Document Purposein the install mysql server application under Linux. (Note: This document installs the MySQL application using the Yum Library installation ,

Rights statement: This article for Bo Master original article, without Bo Master permission not reproduced.Blog "Java implementation MySQL database backup (i)" using I/O stream to implement the MySQL database backup, this method is more complicated,

This address: http://www.cnblogs.com/qiaoyihang/p/6270165.htmlMySQL itself does not have the split function, but the custom function that we implement the exhaustion function is very simplesyntax for creating a functionUser-defined functions are a

var mysql = require (' mysql '); var conn;function handleError () { conn = mysql.createconnection ({ host: ' localhost ', User: ' Nodejs ', password: ' Nodejs ', database: ' Nodejs ', port:3306 });

First, let's talk about why the tables are divided.When a piece of data reaches millions of, you spend more time searching for it, and if you have a joint query, I think it's possible to die there. The purpose of the sub-table is to reduce the

A few days ago, a script was used to view the events in the Redis queue without stopping. If any, take the event out and perform some database operations.It was later found that the first event of the day would lead to the occurrence of data that

How to make MySQL data synchronousFirst assume that there are hosts A and B (Linux system), host A's IP is 1.2.3.4 (of course, can also be dynamic), host B's IP is 5.6.7.8. Two hosts are loaded on the Php+mysql, now operation is the data on host A,

Environment:mater:centos7.1 5.5.52-mariadb 192.168.108.133slave:centos7.1 5.5.52-mariadb 192.168.108.1401. Export the primary service data and synchronize the primary and standby dataMasterExport the database information that needs to be

First, prefaceThe database reading and writing separation strategy in distributed environment is a key solution to solve the bottleneck of database reading and writing performance, and it is to maximize the speed and concurrency of reading (read)

1 #!/usr/bin/env python2 #-*-coding:utf-8-*-3 ImportMySQLdb4 5conn = MySQLdb.connect (host='192.168.1.101', user='Root', passwd='123', db='Host')6cur = conn.cursor (cursorclass=MySQLdb.cursors.DictCursor)7Recout = Cur.execute ('Select Ip,name from

PHP$dsn= ' MYSQL:HOST=LOCALHOST;DBNAME=MSSC ';$user= ' Root ';$password= ' ';$status=1;Try { $sql= ' SELECT * from Onethink_order where Status=:status '; $DBH=NewPDO ($dsn,$user,$password); $DBH->setattribute

Java Connection MySQL need driver package, can download the jar package provided by rookie Tutorial:Http://static.runoob.com/download/mysql-connector-java-5.1.39-bin.jar The method of operation can be divided into three steps:First, the

Skills and optimization of SQL statements learned by mysql, and skills of mysqlsql statementsI. use regular expressions in SQL Select name, email from user where email Regexp "@ 163 [.,] com $ "; The use of Regexp in SQL statements has a great