create database if not exists

Debian 9.2 install Zabbix 3.4.2 Recently, I want to install Zabbix monitoring software In Debian 9.2. I have no choice but to find that many documents have not been installed successfully. Many of them are due to installation environment problems

Python accesses the MySQL database and supports addition, deletion, modification, and query.Overview: I want to know more about database access operations. However, since I recently learned Python, I will use Python to implement it below. These

Grant permissions on database objects to users 1. grant normal data users the right to query, insert, update, and delete all table data in the database. Grantselectontestdb. * tocommon_user @ % grantinsertontestdb. * tocommon_user @ %

High Availability Analysis of MySQL: MySQL HA solution For most applications, MySQL is the most critical data storage center. Therefore, we have to deal with the problem of how to make MySQL provide the HA service. When the master is running, we

In CentOS6.5, you can use Shell to modify the initial MySQL password, enable remote logon, authorize remote logon users, and create, back up, and restore MySQL databases. In CentOS 6.5, you can use Shell to modify the initial MySQL password, enable

PHP learning-two ways to connect to MySQL: mysql Record two methods for connecting PHP to MySQL. First mock the data, you can execute the SQL. /* Create database */create database if not exists 'test';/* select DATABASE */USE 'test '; /* create

: This article describes how to connect to MySQL through PHP learning. For more information about PHP tutorials, see. Record two methods for connecting PHP to MySQL. First mock the data, you can execute the SQL. /* Create database */create

Due to collaborative project development, my colleague sent an SQL file of the project and opened it as a directory, there are hundreds of databases, each database is used as a separate file, and each SQL file contains CREATEDATABASEIFNOTEXISTS

Before the PythonDB-API is available, the application interfaces of different databases are messy and their implementations are different. If the project needs to change the database, a lot of modifications are required, which is inconvenient. The

I saw this SQL statement today. I have heard of it before, but I have not understood it. Therefore, I would like to take a note here: userNamevarchar (20) collatechinese_prc_ci_asnull1 first, collate is a clause, it can be applied to database

After learning some basic python things, I always want to write a program by myself, but writing a program does not use a database, which is too low-end. how can I operate a python link to mysql? The following is a detailed introduction for everyone.

Let's talk about the MySQL character set. First of all, this article is purely my personal experience and is applicable to my common environments and projects. Personally, we recommend that you use utf8 (HTMLThe page corresponds to UTF-8), so that

I insist on learning a little bit every day and accumulate a little bit every day. I wrote this article during my dinner and used my spare time to learn how to operate MYSQL in python, so sort it out. I am using a MYSQL database operated by MySQLdb.

Mysql installation and daily use of bitsCN.com 1.1 MySQL database N MySQL Performance Blog (www.mysqlperformanceblog.com) N MySQL PUB (www.mysqlpub.com) N MySQL Performance Tuning and architecture design N exploring MySQL 1. install MySql 1.

PHP learning notes: php network traffic statistics system. PHP learning notes: php network traffic statistics system description: the code is from the book PHP and MySQLWeb application development, and some code has been modified, all of my tests

The mysqldump client can be used to dump databases or collect databases for backup or transfer data to another SQL Server (not necessarily a MySQL Server ). Dump contains table Creation The mysqldump client can be used to dump databases or collect

Directly write a sentence to getshell. All tests are performed locally. I am determined to be a good boy ~! Read the Code with painstaking efforts. The StartBBS interface is refreshing and small. Download and install. After installation, an install

Recently changed jobs, the company more than 40 people share a 20M bandwidth wireless network, the router for Cisco R2911. Boss, let me make a cacti to monitor Cisco routed network card traffic. The whole days can not get the SNMP data, finally to

1. Via Hive ViewCREATE EXTERNAL TABLE if not exists finance.json_serde_optd_table (RetCode string, retmsg string, data array>) ROW FORMAT SERDE ' org.apache.hive.hcatalog.data.JsonSerDe ' location ' hdfs://wdp.xxxxx.cn : 8020/nifi/finance1/optd/';

1. Configure the environment, will throw 500 of the wrong, step by step troubleshooting, first ping xxxx.com if no problem, then Telnet xxxx.com 80 (remember to add the port number)2. Remember that throwing 500 is not the problem of nginx, to