create database if not exists

Python access to the MySQL database can use the MYSQLDB module, the main method is as follows:(1) Commit (): commits the transaction.(2) Rollback (): ROLLBACK TRANSACTION.(3) Callproc (Self,procname,args): Used to execute stored procedures, accepted

   A: What is Dbutils? (when it's hard to understand an official explanation of something, let's remember what it does)      dbutils: The main thing is to encapsulate the JDBC code, simplifying the operation of the DAO layer.       Role: A simple

Installation package: mysql-5.6.30-linux-glibc2.5-x86_64.tar.gzUse Xshell to connect to the Linux server, log in with the root user name, and execute the following command in

Ddl:databse Definition Language Creating a database create {db | SCHEMA} [IF not EXISTS] Db_name[Create_specification]Create_specification: [DEFAULT] CHARACTER SET [=] Charset_name    [DEFAULT] COLLATE [=] Collation_nameexample1:View character set

#coding=utf-8import MySQLdbconn = MySQLdb.connect(host=‘localhost‘,user=‘root‘,passwd=‘123456‘,charset=‘utf8‘)cursor = conn.cursor()try:    #创建数据库    DB_NAME = ‘test‘    cursor.execute(‘DROP DATABASE IF EXISTS %s‘ %DB_NAME)    cursor.execute(‘CREATE

The commonly used Structured query language consists of data definition language (DDL), Data Manipulation language (DML), Data Control Language (DCL) and data Query Language (DQL). Especially in relational databases such as (MySQL, mariadb, Percona,

Usage of the mysqldump command1. Export all librariesSystem command LineMysqldump-uusername-ppassword--all-databases > All.sql2. Import all librariesMySQL command lineMysql>source All.sql;3. Export some librariesSystem command

1. Set up CREATE DATABASE Package.json{"Name": "Shopping-cart-example", "Version": "0.0.1", "dependencies": {"Express": "4.10.6", "express-session": "1.9.3" , "Jade": "1.8.2", "Body-parser": "1.10.0", "MySQL": "2.5.4"}}Database configuration:{"host":

Key words Enter Mysql:mysql-uroot-p View database: Show databases Enter the database: Use the ' S_name View tables in the database: show tables Above in Doc demo, later in the tool to demonstrate the case of MySQL is not

The mysqldump client can be used to dump a database or collect a database for backup or to transfer data to another SQL Server (not necessarily a MySQL server). The dump contains SQL statements that create tables and/or Mount tables.If you are

Create user: CREATE user ' username ' "@ ' hostname '" identified by ' password ' hostname can be empty, default to NULL is% permission, indicating all hosts can connect' jredu '@'localhost'jredu';Grant to assign permissions to the user; Grant

Create a database named MYDB1, if there is a MYDB1 database is used directly, if none create the MYDB1 database is created if not EXISTS mydb1;create db if not exists mydb1; Create a MYDB2 database that uses the UTF8 character set, note that this is

We know that data is at the heart of an enterprise IT architecture, and in order to prevent data loss or some other special purpose for some accidental reasons, it is especially important to make backups of the data at the usual times.First, why to

MySQL default encoding is Latin1, does not support Chinese, to support noon need to change the default code of the database to GBK or UTF8.1, need to log in as root user can view the database encoding method (the command logged in as root User:

A part of the understanding of Python character encoding was compiled, this time primarily designed to database operations. Here are some of the concepts and principles of coding, sorted by entry: CREATE DATABASE IF not EXISTS db_name DEFAULT

1. Create a simple database1 CREATE DATABASE t1;If the image is not hit, the system waits until the user enters the Terminator before the line statement.2. View the list of databases under the current server1 DATABASES;Must be databases, the last s

One, SQL statements1. Operational database(1) Create a databaseCREATE DATABASE [IF not EXISTS] db_name [create_specification [, Create_specification] ...]Create_specification:[DEFAULT]   CHARACTER SET Charset_name | [DEFAULT] COLLATE collation_name~

The principle of modification is to create a new database and then rename all the tables. Just look at the script below. I'm going to change the name of the download database to DOWNLOADV2.#!/bin/bashmysql-uroot-p1q2w3e4r-e ' CREATE database if not

The SQL language includes statements from four main programming language categories: Data definition Language (DDL), Data Manipulation language (DML), Data Control Language (DCL), and transaction control language. The database schema definition

Database server, database, and table relationships – the so-called database server is installed on the machine with a database management program that manages multiple databases, and the general developer creates a database for each application.　　–