Mybatis引入与使用的图文步骤

-- 如果数据库不存在则创建数据库
CREATE DATABASE IF NOT EXISTS demo DEFAULT CHARSET utf8;
-- 切换数据库
USE demo;
-- 创建表
CREATE TABLE T_USER(
  ID INT PRIMARY KEY,
  USERNAME VARCHAR(32) NOT NULL,
  AGE INT NOT NULL 
);

<dependency>
    <groupId>org.mybatis</groupId>
    <artifactId>mybatis</artifactId>
    <version>3.4.5</version>
</dependency>

<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>5.1.49</version>
</dependency>

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="${driver}"/>
                <property name="url" value="jdbc:mysql://${ip}:${port}/${database}?useUnicode=true&amp;useSSL=false&amp;characterEncoding=utf8"/>
                <property name="username" value="${username}"/>
                <property name="password" value="${password}"/>
            </dataSource>
        </environment>
    </environments>
</configuration>

// 读取mybatis配置文件
InputStream inputStream = ClassLoader.getSystemClassLoader().getResourceAsStream("mybatis-config.xml");
// 根据配置创建SqlSession工厂
SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder()
        .build(inputStream);
SqlSession sqlSession = null;
try {
    // 创建SqlSession
    sqlSession = sqlSessionFactory.openSession();
    // 获取连接
    Connection connection = sqlSession.getConnection();
    // 获取数据库元数据
    DatabaseMetaData databaseMetaData = connection.getMetaData();
    // 获取数据库名称
    System.out.println("database product name: " + databaseMetaData.getDatabaseProductName());
    // 获取数据库版本
    System.out.println("database product version: " + databaseMetaData.getDatabaseProductVersion());
    // 获取数据库主版本
    System.out.println("database major version: " + databaseMetaData.getDatabaseMajorVersion());
    // 获取数据库小版本
    System.out.println("database minor version: " + databaseMetaData.getDatabaseMinorVersion());
} catch (SQLException e) {
    e.printStackTrace();
} finally {
    // 关闭会话
    if(Objects.nonNull(sqlSession)) {
        sqlSession.close();
    }
}