create database if not exists

if (!@mysql_select_db($dbname,$conn)) { if (!@mysql_query('CREATE DATABASE '.$dbname)) { exit('指定的数据库('.$dbname.')系统尝试创建失败，请通过其他方式建立数据库'); } else { @mysql_select_db($dbname,$conn);

About PHPOfficial website: http://www.php.netI. Introduction of PHPPHP is a generic server-side scripting language, which is used primarily for web development to implement dynamic Web pages, and is one of the first server-side scripting languages

The default encoding of MySQL is Latin1, which does not support Chinese characters. You need to change the default encoding of the database to GBK or utf8 at noon.   1. You need to log in as the root user to view the database encoding method (the

The principle of master-slave synchronization for MySQL is the same as that for master-slave synchronization.EnvironmentOperating system version: 64-bit CentOS7MySQL version: mysql5.6.33Node 1IP: 192.168.1.205 host name: edu-mysql-01Node 2IP: 192.168

Check that the default mysql encoding method is Latin1, which does not support Chinese characters. You need to change the default encoding of the database to gbk or utf8 at noon. 1. You need to log in as the root user to view the database encoding

[MySQL major series] Mysql cluster architecture, mysql cluster architecture Original article address (): [Technical Article] Mysql cluster architecture Address: http://www.cnblogs.com/aiweixiao/p/7258444.html Click follow public account  1. Main

Basic MySQL operations, I. Databases 1. MySQL: relational database, that is, using a two-dimensional table to store data. 2. Common databases Oracle: Oracle (with the highest usage ); DB2: IBM; SQL Servlet: Microsoft; Sybase: Celes; MySQL:

Common MySQL syntax and mysql syntaxReference: http://www.yiibai.com/mysql/ 1, SQLECT syntax SELECT column_1, column_2, ... FROM table_1 [INNER | LEFT |RIGHT] JOIN table_2 ON conditions WHERE 　　conditions GROUP BY column_1 HAVING group_conditions

MySQL Base, mysqlbase /* Connect and disconnect the server */mysql-h address-P port-u username-p Password---> Input pwd /* Database storage engine */InnoDB:1) Ability to submit, roll back, crash recovery, and transaction processing (ACID)2) handling

Copy codeThe Code is as follows: Import MySQLdbTry:Conn = MySQLdb. connect (host = 'localhost', user = 'root', passwd = 'root', db = 'test', port = 3306)Cur = conn. cursor ()Cur.exe cute ('select * from user ')Cur. close ()Conn. close ()Counter t

Use Python to operate Mysql, and use Python to operate Mysql The main programming language is Java, and Mysql is also used during development. for testing purposes, you often need to operate databases, such as backup, insert test data, and modify

I am using a MYSQL database operated by MySQLdb. Let's take a simple example: 12345678910 import MySQLdb  try:     conn=MySQLdb.connect(host='localhost',user='root',passwd='root',db='test',port=3306)     cur=conn.cursor()     cur.execute(

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For more information, see Mysql. Preface The database has always been a weak place for me. I prefer to Use ORM to make a record based on my own experience (python + sqlalchemy, I have always felt that SQL spelling is a painful task (mainly because I

MySQL extension in PHP: MySQL database Overview I. SQL: Structured Query Language Structured Query Language (Structured) is a standard Language used to Query and modify Database Information and manage and maintain databases. The SQL language has a

How to process XML files in the Python instance and xml in the python instance RequirementThere is a table with a large amount of data, which is updated every day. Its fields can be configured through the xml configuration file, that is, the fields

1. What is the difference between get and post submission methods in a form? A: Get is a send request HTTP protocol to receive via URL parameter delivery, while post is entity data that can be submitted with a large amount of information through a

Environment preparationPython 2.6Git version 1.8.4.1Ruby version ruby-2.0.0-p353Gitlab-shell v1.8.0Gitlab version 6.4.3Because the python version of centos6 series is 2.6 and is supported, you do not need to upgrade python.Upgrade python version> 2.5

This article tags: ci/cd codeship of the Docker PHP command-line program Content essentials:-use jet to set up the environment and run tests locally-configure Codeship Pro automatically runs the test each time a new code submission is

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