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First, prepare the database data, and fill in the data in the database. Independent abstract method, reuse. First, initialize the interface (define a method) Second, verify the user name and password (define another method) package com.bjpowernode.jdbc; import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; impor ...

1. Database table structure optimization a. select the most applicable field attribute and index According to the actual situation: for example, limit the length of varchar field, set fixed length char; use enum. b. use connections instead of subqueries According to the actual situation: try not to use subquery if it can be rewritten as join.// ...

Content of this article Using Redis to optimize interface performance in high concurrency scenarios Database optimistic lock With the approaching of the double 11, all kinds of promotional activities began to become popular, and the mainstream ones are seckill, coupons, and so on. The main scenarios involving high concurrency competing for th ...

Using SELECT in MySQL stored procedures... The INTO statement assigns values to variables: Used to save the column values of a row returned by the query to a local variable. Requirement: There can be only 1 row in the result set of the query. SELECT col_name[,...] INTO var_name[,...] table_expr Use SELECT... The INTO statement queries in t ...

                                  Global primary key auto increment I. self increasing method of local files            &e ...

In this article, I'll show you how to use Java 8 to develop and run simple Spring Web applications without having to install Java 8 on your local machine. Python developers use virtual environments to create and manage separate environments for different projects. Each environment uses different versions of Python to execute, store and parse Py ...

Summary                         But without special business requirements, the official logstash has its advantages.    when using logstash, we should first understand its characteristics, and then decide whether to use i ...

mysql introduction and installation mysql introduction mysql is a famous open source relational database. It was first opened by AB company, and later it came to Sun company. After Sun was acquired by Oracle, mysql was owned by Oracle. Since then, mysql has been commercialized, and the database named mariadb has been open-source as a branch of ...

1. Two solutions to slave SQL running: no Enter the slave server and run: mysql> show slave status\G ....... Relay_Log_File: localhost-relay-bin.000535 Relay_Log_Pos: 21795072 Relay_Master_Log_File: localhost-bin.000094 Slave_IO_Running: Yes Slave_SQL_Running: No Replicate_ ...

Before that, I also introduced the articles related to MySQL high availability: Summary of MySQL synchronous replication and high availability schemes Introduction to Mysql route What is mysql route MySQL Router is a lightweight agent between application client and dbserver. It can detect, analyze and forward queries to back-end database insta ...