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JDBC advanced Use of JDBC connection pool The concept of database connection pool Database connection is a key and limited resource. When java program and database get the connection, it consumes resources especially. Therefore, a database connection pool is created to manage the connection betwe ...

Article catalog Getting started with SkyWalking background Install Elasticsearch and start Install SkyWalking and start Agent for configuring spring cloud microservices View the link call of spring cloud Single microservice call monitoring Call link monitoring between microservices All microservice ...

Configuration of xml Create xml file in src directory, named custom Add code to xml <?xml version="1.0" encoding="UTF-8"?> <beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  xmlns:context="http://www.springframework.org/schema/context"  xmlns:aop="http:/ ...

Today, the project is not busy. I want to have a look at the sharding JDBC sub database and sub table. I want to achieve the following: Discard the xml configuration and use. yml or. properties file + java to configure spring. Use Druid as database connection pool, open monitoring interface at the same time, and support monitoring multiple dat ...

Exception Information Ccom.mysql.cj.jdbc.exceptions.MySQLTransactionRollbackException: Lock wait timeout exceeded; try restarting transaction Reasons for the problem When optimistic locks modify data, the data version number has been modified, causing the modification to fail. When retrying the modification, each time the data read from the d ...

JDBC fixing steps: Load driver String url="jdbc:mysql://localhost:3306/jdbcstudy?useUnicode=true&characterEncoding=utf-8&serverTimezone=GMT"; String username="root"; String password="123456"; Class.forName("com.mysql.cj.jdbc.Driver");//I don't know why com.mysql.jdbc.Driver will report an error. Please leave a message if you have any ...

Spring's JDBC module is responsible for database resource management and error handling, which greatly simplifies the operation of the database by the developers, so that the developers can get rid of the tedious database operation, so as to put more energy into writing business logic. For the Spring framework of database operation, the JdbcTem ...

brief introduction Environmental preparation Project directory jar package used Database connection configuration JDBC configuration file Run tests brief introduction JDBC (Java database connectivity) is a Java API used to execute SQL statements. It can provide unified access to a variety of relationa ...

In the case of unconformity framework, when using jdbc to read data from the database, we have to get and set one by one, which is not only tedious but also not concise. So we write a tool class using java reflection mechanism, so it is not so troublesome to use jdbc to get data from the database. Because in many cases there is more than one p ...

Preface: (welfare at the end of the article) Today I'd like to introduce a new ORM framework - > jooq. Maybe many friends haven't heard of this framework Mybatis framework has been used as the persistent layer access framework in Java projects before. However, some recent projects have been developed with JOOQ framework, indicating that the ...