create database if not exists

I. Downloads for mysql-server and mysql-client[Email protected]:/usr/local# sudo apt-get install mysql-server mysql-client (Ubuntu version)Here I am, root password, for rootroot.　second, start MySQL Service[Email protected]:/usr/local# sudo/etc/init.

Python1, the MAC system comes with a Python path/system/library/frameworks/python.framework/version contains multiple versions available: Start Pythonimport sysprint Sys.path View

Shell Scripting Features:Connect MySQL, create the database automatically, the script is as followsMysql-h$mysql_ip-u$mysql_user-p$mysql_password--default-character-set=utf8-e "CREATE database IF not EXISTS test"Database IP, user, password using

We use the current my-sql to compare the new version of my SQL 5.0 version. First, how to get my SQL 5.0 we can download from the Internet ([Url]www.mysql.cn[/url]).Let's look at how to install my SQL to support multiple platforms, that is, it can

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MySQL's default encoding is Latin1, does not support Chinese, to support Chinese need to change the database's default encoding to GBK or UTF8. 1, need to log in as root user can view the database encoding (as root user login command: >mysql-u root–

Main Building process 1. pom.xml file to add MyBatis and database dependencies, here using MySQL: 3.2.3 5.1.26 1.7.5 6.8.7 org.mybatis mybatis ${mybatis.version} mysql mysql-connector-java ${mysql.version} & lt;! --MyBatis boot to load

I. Questions raised In a data warehouse application, create a new MySQL database every day, named after the day, such as d_p20161201, d_p20161202, and use kettle to connect these databases to do data cleaning and ETL work. Because the database is

Description: Code Source "PHP and MySQL Web application Development" book, there is some of the code is modified, after my test all can be used.   This IP address shown in the normal, my computer is supported IPv6.       Database scripts for this

To create a database: Everything in MySQL starts with a database, which we can understand as "bookshelves", which can be understood as "books on the shelves", and the data in the table can be understood as "the contents of the book". This means

Ruby on Rails is shaking the whole Web development landscape. Let us first understand the underlying technology: Ruby is a free, simple, intuitive, extensible, portable, and interpreted scripting language for fast and simple object-oriented

PHP Create data [crate database] and empty datasheet function Ebak_creatdb ($dbname, $dbchar = ' ") {Global $empire, $phome _db_ver;$dbname =reppostvar ($dbname);if (!trim ($dbname)){Printerror ("Emptydbname", "History.go (-1)");}$a = "";if

Use of the mysqldump command 1. Export all libraries System command Line Mysqldump-uusername-ppassword--all-databases > All.sql 2. Import all libraries MySQL command line Mysql>source All.sql; 3. Export some libraries System command Line

The creation of libraries, tables, and query statements in MySQL is very helpful for us to use the database in the future, this article is a summary of these basic statements, I hope it will help you 1. Create and delete databases Creating a

#!/bin/bash#scripts SH batch_databasename.shBakfile=/data/dbbackupLogfile=/data/bak.logDbuser=xxxDbpasswd=xxxip=ifconfig | grep "inet addr"| grep Bcast| awk ‘{print $2}‘| awk -F":" ‘{print $2}‘nowtime=$ (Date +%y%m%d)#ser_port =cat

1. View database version informationMysql> select version ();2. View the database currently in useMysql> Select Database ();3. View current logged in userMysql> Select User (), or Mysql>select current_user ();4. See the current date, time, or time

1.Mysql Code Specification1.关键字、函数名称大写2.数据库名称、表名称、字段名称等全部小写3.必须以分号;结尾 (或 \g)2. Log MySQL Logs开始记录mysql> \T 日志地址 日志文本名.txt结束记录mysql> \t3. Create a Database//简单创建CREATE DATABASE test1; //创建test1数据库//详细创建：查验无重名后再新建数据库，并指定编码格式create database if not

Classification of databases:Mainstream database products: lamp.the nature and performance of database storage:The essence is that a large number of "data values" through the database management system for some complex but logical structure of the

MySQL Character Set introductionIncludes two-part character set character and proofing rules collationCharacter sets are used to define how the MySQL string is storedProofing rules are the way to define a comparison stringIf the database has more

[TOC] RDBMS data timing acquisition to HDFS prefaceIn fact, it is not difficult to use sqoop timing from the MySQL import into HDFs, mainly the use of SQOOP commands and the operation of the Linux script