mybatis强化（一）基本配置补充

本文继续最基本案例，使用了mapper接口的注解定义方式。转载注明出处：http://www.cnblogs.com/wdfwolf3/p/6797133.html，谢谢。文件目录如下，

1.配置文件mybatisconfig.xml如下，标红一行和常见设置不同，用来去除警告：Loading class `com.mysql.jdbc.Driver'. This is deprecated. The new driver class is `com.mysql.cj.jdbc.Driver'. The driver is automatically registered via the SPI and manual loading of the driver class is generally unnecessary.原来的类名已经去除，现在使用新的名称。

<?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="com.mysql.cj.jdbc.Driver" />
                <property name="url" value="jdbc:mysql://localhost:3306/mybatis?serverTimezone=GMT%2B8&amp;useSSL=false&amp;useUnicode=true&amp;characterEncoding=utf8" />
                <property name="username" value="root" />
                <property name="password" value="1234" />
            </dataSource>
        </environment>
    </environments>

    <mappers>
        <mapper class="com.practice.mapper.UsersMapper"/>
    </mappers>
</configuration>

2.Test测试函数如下，相关问题在前一篇文章中已讲

package com.practice.Test;

import com.practice.bean.Users;
import com.practice.mapper.UsersMapper;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import java.io.IOException;
import java.io.InputStream;

public class Test2 {
    public static void main(String[] args) throws IOException {
        String resource = "mybatisconfig.xml";
        InputStream is = Resources.getResourceAsStream(resource);
        SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(is);
        SqlSession session = sessionFactory.openSession();
        UsersMapper mapper = session.getMapper(UsersMapper.class);
        Users user = mapper.getByName("瓦房店");
        session.close();
        System.out.println(user.getId());
    }
}

p.s.

　　如果使用IDEA每次运行都报：Warning:java: 源值1.5已过时, 将在未来所有发行版中删除，Warning:java: 目标值1.5已过时, 将在未来所有发行版中删除，
Warning:java: 要隐藏有关已过时选项的警告, 请使用 -Xlint:-options。

除了改配置，将默认改为1.8编译。还可以在pom.xml文件中加入如下语句解决

<properties>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
</properties>