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Overview: 1. Preparation Create a database and user table, account table (using mysql) Entity class User Entity class Account dao.UserDao dao.AccountDao 2. XML configuration file Mybatis-config.xml.xml (under resources directory) 3. Operation test UserDaoTest AccountDaoTest 4. note: Project ...

Database transactions A series of database operations with ACID characteristics realized by database, a refers to atomicity, C refers to consistency, I refers to isolation, and D refers to persistence; Atomicity refers to that the operation within a transaction is a whole and cannot be subdivided; ...

order This paper mainly studies the individual knowledge of artemis acknowledge activemq-artemis-2.11.0/artemis-jms-client/src/main/java/org/apache/activemq/artemis/jms/client/ActiveMQMessage.java public class ActiveMQMessage implements javax.jms.Message { //...... public void acknowledge() throws JMSException { if (session != nul ...

1, Inheritance structure and component initialization of dispatcher Servlet 1.1 dispatcher servlet genealogy The essence of spring MVC is a Servlet, which inherits from HttpServlet. Spring MVC provides three levels of servlets: HttpServletBean, FrameworkServlet and DispatchServlet, which inherit fr ...

Two modes: queue mode / topic mode pom.xml <dependency> <groupId>org.apache.activemq</groupId> <artifactId>activemq-all</artifactId> <version>5.15.9</version> </dependency>   In fact, the queuing mode is the food sharing mode. For example, if the manufacturer sends 10 ...

Original blog address This picture is very important!!! Town building 0x001 override SessionManager shiro provides three default implementations: DefaultSessionManager: for java se environment ServletContainerSessionManager: implementation used by default, Servlet container management DefaultWebSe ...

The main test is what happens to expdp when a table has DML action. This test mainly opens three windows, one is to insert data, about 100W pieces will be inserted for a long time. The second window queries the inserted data, of course, it does not query 100W pieces. In the third window, when inserting data, perform data pump e ...

The following is an introduction from MQ to RabbitMQ, and a demo of the six working modes of RabbitMQ MQ: MQ is called Message Queue. It is translated as Message Queue. MQ is a communication method between applications. Applications communicate by writing and retrieving queued application specific d ...

Set Label The set tag is used to set values within a range (request, session, or application) or to set property values for an object. The set tag is used in the following format: (1) Use the value attribute to specify the value of a variable within a specific range in the following format: <c ...

Connections and threads View the connection information show processlist +----+------+------------------+------+---------+------+----------+------------------+ | Id | User | Host | db | Command | Time | State | Info | +----+------+------------------+------+---------+------+----------+------------------+ | 3 | root ...