Programmer Group

1. Introduction to SSM (Baidu replication) SSM (Spring + Spring MVC + MyBatis) framework set is composed of Spring and MyBatis open source frameworks (Spring MVC is part of Spring). It is often used as a framework for web projects with simpler data sources. 2. Construction of SSM framework 2.1 Cre ...

Database connection pool Previous problems In fact, the previous code has no problem, enough to operate the database. But getting the connection object (driverManager.getConnection(String driverClassName, String url, String password);) is a resource-intensive step. Creating the connection object eve ...

Principle of Automatic Configuration When spring boot loads the main configuration class, it turns on the automatic configuration function @Enable AutoConfiguration Role of Enable AutoConfiguration: Add some components to the container using AutoConfiguration Import Selector You can use the cont ...

Introduction to 0.JTA(Java Transaction Manager) (1) jta and jdbc Simply put, jta is a multi-library transaction. jdbc is a single-library transaction. (2) XA and JTA XA: XA is a specification or a transaction protocol. The XA protocol was first proposed by Tuxedo and handed over to the X/Open organization as the interface standard between ...

Guice It's an open source dependency injection library for Google, smaller and faster than Spring IoC. Elastic search uses Guice extensively. This article briefly introduces the basic concepts and usage of Guice. Learning objectives Summary: Understand what Guice is and what its characteristics are. Quick Start: Learn about Guice through examp ...

1. Introduction to PLSQL Oracle database extends SQL, and then adds some programming language features, which can control the execution process of SQL, and then realize some complex business functions. 1.1 Composition of PLSQL Component declare - It's the declaration part. begin - yes plsql ...

public static void main(String[] args) { try { Class.forName("com.mysql.jdbc.Driver"); String url="jdbc:mysql://localhost:3306/test"; String username = "root"; String password = "root"; Connection conn = DriverManager.getConnection(url, username, password); Prepare ...

Preliminary study of java SPI mechanism 1. SPI mechanism The full name of SPI is Service Provider Interface. Most developers may not be familiar with this because it is for vendors or plug-ins. More detailed information is provided in the documentation of java.util.Service Loader. A brief summary of the idea of java spi mechanism. There are m ...

On JDBC and MyBatis MyBatis is a Java-based, JDBC-encapsulated persistence framework. 1 JDBC JDBC(Java Data Base Connectivity) represents a Java database connection. In the Java language, we use JDBC to operate relational databases. 1.1 Case Code package core; import java.sql.*; /** * JDBC Case class. * * @author Li Chengpeng */ public cl ...

Introduction to Phoenix Phoenix is an open source SQL engine for HBase. You can use the standard JDBC API instead of the HBase client API to create tables, insert data, and query your HBase data.Phoenix is an SQL engine built on HBase. You may have "Will Phoenix reduce the efficiency of HBase?" Or "Is Phoenix inefficient?" ...