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1, MySQL database 1. Create database CREATE DATABASE jdbc CHARACTER SET 'utf8'; 2. build tables CREATE TABLE user ( id int(10) NOT NULL AUTO_INCREMENT, userName varchar(20) NOT NULL, PRIMARY KEY (id) ); 3. Add data 2, Connect MySQL database through JDBC 1.JDBC URL 2.Statement boolean execute(String SQL): if the ResultSet object can be ...

Introduction of Master and Subordinate redis installation 1. Master-Subordinate-Usage Like MySQL, redis support master-slave synchronization, as well as a master-slave and multilevel slave structure. The primary-slave architecture is designed for purely redundant backups, and for improved read perf ...

Original link: http://www.yiidian.com/dbutils/dbutils-beanlisthandler.html org.apache.commons.dbutils.BeanListHandler is the implementation of the ResultSetHandler interface, and is responsible for converting all records at the ResultSet result level to the List collection of JavaBean s. This class is thread safe. 1 syntax for beanlisthandler L ...

Hive can only be installed on one node 1. Upload tar package 2. Decompression tar -zxvf hive-1.2.1.tar.gz -C /apps/ 3. Install mysql database (switch to root user) (there are no limitations on where to install, only nodes that can connect to the hadoop cluster) 4. Configure hive (a) Configure the HIVE_HOME environment variable vi conf/hive-e ...

@2020.3.24 (Q1) Homework:1. Compile the parametric decorator explained in class def auth(db_type = 'file'): def inner(func): def wrapper(*args, **kwargs): inp_name = input("your name:").strip() inp_pwd = input("your password:").strip() if db_type == 'file': with open(r'd ...

@2020.3.24 (Q1) Homework:1. Compile the parametric decorator explained in class def auth(db_type = 'file'): def inner(func): def wrapper(*args, **kwargs): inp_name = input("your name:").strip() inp_pwd = input("your password:").strip() if db_type == 'file': with open(r'd ...

The previous article introduced the logical backup tool mysqldump. This article will demonstrate the second part of data backup and recovery by using xtrabackup, a more popular physical backup tool. 1. Installation of xtrabackup tool 1.1 installation dependency package /* xtrabackup You need to install the related dependency package to use th ...

Recently, when communicating with a big guy, I mentioned the problem of SQL query. His idea is to query data with the most primitive database driver without ORM. The benefits of doing so are twofold Express SQL semantics clearly for later optimization. Especially in report, data analysis and other complex SQL. Reduce useless encapsulation and ...

Author: Liu An A member of the test team of akesheng, who is mainly responsible for the related test tasks of TXLE open source project, is good at Python automatic test development, and is recently absorbed in the relevant knowledge of Linux performance analysis and optimization. Source: original contribution *Aikesheng is produced by the op ...

This article refers to the original- http://bjbsair.com/2020-03-22/tech-info/5348/Summary InnoDB stores data in the form of tablespace, In the default configuration, there will be a file with the initial size of 10MB and the name of ibdata1. This file is the default tablespace file. Users can set it with the parameter InnoDB? Data? File? Path. ...