Redis and Pytnon interact

Install mysql module sudo pip install redis Install using source code unzip redis-py-master.zip cd redis-py-master sudo python setup.py install Import module import redis Connect try: r=redis.StrictRedis(host='localhost',port=6379) except Exception,e: print e.message Method 1: according to different data ...

Posted on Mon, 06 Jan 2020 05:17:18 -0800 by dtasman7

SpringBoot configures multiple data sources (MySQL+SQLServer)

Spring boot version 1.5.13.RELEASE. The following maven dependencies include jpa, web, mysql driver, sqlserver driver and test module. (add as needed) <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.5.13.RELEASE</version> ...

Posted on Sun, 05 Jan 2020 18:29:29 -0800 by wiley

Create a new user in MySQL and grant it full access to a database

I want to create a new user in MySQL and provide full access to only one database (for example, dbTest, I use create database dbTest; such a command create database dbTest;).What do those MySQL commands do? #1st floor Try this to create a user: CREATE USER 'user'@'hostname'; Try this to access the database dbTest: GRANT ALL PRIVIL ...

Posted on Sun, 05 Jan 2020 13:02:36 -0800 by bigfunkychief

Store the data crawled by the crawler framework into mysql database

Crawling website data by using scratch is a relatively mainstream crawler framework at present, which is also very simple. 1. After the project is created, change the value of robotstxt'obey to False in settings.py. Otherwise, it will follow the robots protocol by default, and you will not be able to crawl any data. 2. Start ...

Posted on Sun, 05 Jan 2020 12:57:11 -0800 by the max

Mysql Concurrency Ensures Data Consistency - Example

1. Background A problem occurred in a recent project and the update failed when a document was updated concurrently.For example: @Transactional(rollbackFor = Exception.class) public void update(Integer id){ //1. Query by id //2. Update the value of a field } The generated SQL would look like this: UPDATE table SET field = #{field,jdb ...

Posted on Sun, 05 Jan 2020 06:36:13 -0800 by riffy

MyBatis Global Profile Details

Root element <configuration>, child element: <properties> <setttings> <typeAliases> <typeHandlers> <objectFactory> <plugins> <environments> <databaseIdProvider> <mappers> The configuration of these child elements is sequential and can only be configured in the order above. Some child ...

Posted on Sun, 05 Jan 2020 03:50:57 -0800 by smartsley

Three scheduling problems in Mysql programming practice

Three scheduling problems in Mysql programming practice 1. demand Use SQL statements to sort the data in the table. There are two sorting rules, one is global increasing order, the other is global increasing order with the same rank and order. 2. table data The table creation statement is as follows: CREATE TABLE `t` ( ...

Posted on Sat, 04 Jan 2020 23:05:59 -0800 by dan231

Python connect database add / delete check and simulate bank operation

What is PyMySQL? PyMySQL is a library used to connect to the MySQL server in Python3.x, and mysqldb is used in Python2. PyMySQL follows the python database API v2.0 specification and includes the pure Python MySQL client library. query data base import pymysql #No semicolon to separate a statement compared to java conn=pym ...

Posted on Sat, 04 Jan 2020 20:49:39 -0800 by rab

The latest MySQL tutorial for Linux Installation

The latest MySQL tutorial for Linux Installation The latest MySQL tutorial for Linux Installation install Install from yum 1. Download and install 2. Upgrade the installation warehouse 3. Modify the default installation version of the warehouse, and only enable one enabled version, such as 5.7 4. (optional) if mysql has ...

Posted on Sat, 04 Jan 2020 12:50:47 -0800 by justinwhite93

Steps for installing JDK1.8\tomcat\MySQL 5.7 in CentOS7 environment

Installing MySQL 5.7 in CentOS7 System Download: CentOS-7-x86_64-DVD-1804.iso http://mirrors.aliyun.com/centos/7/isos/x86_64/CentOS-7-x86_64-DVD-1804.iso Package download: 1.jdk-8u181-linux-x64.tar.gz http://download.oracle.com/otn-pub/java/jdk/8u181-b13/96a7b8442fe848ef90c96a2fad6ed6d1/jdk-8u181-linux-x64.tar.gz?AuthParam=153 ...

Posted on Sat, 04 Jan 2020 11:19:24 -0800 by bluto374