IDEA工具下Mybaties框架快速入门程序

本篇文章介绍在IDEA工具下mybatis快速入门程序分为以下五步

​ 1 添加依赖包

​ 2 编写pojo对象

​ 3 编写映射文件

​ 4 编写核心配置文件

​ 5 测试框架

详细如下

建立Module后

​ 1 添加依赖包   在pox.xml 添加   代码如下

<properties>
<maven.coppiler.source>1.9</maven.coppiler.source>
<maven.coppiler.target>1.9</maven.coppiler.target>
</properties>
<dependencies>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.6</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.4.5</version>
</dependency>
</dependencies>

​ 2 编写pojo对象  就是表中的实体类

​ 3 编写映射文件  代码如下

<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="cn.lijun.Users">
    <select id="findAll" resultType="domain.Users">
        SELECT * FROM users;
    </select>

</mapper>

​ 4 编写核心配置文件  代码如下

　　

<?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.jdbc.Driver" />
                <property name="url" value="jdbc:mysql://127.0.0.1:3306/mybatis9501?characterEncoding=utf8" />
                <property name="username" value="root" />
                <property name="password" value="root" />
            </dataSource>
        </environment>
    </environments>
    <!--映射文件路径-->
   <mappers>
      <mapper resource="cn/lijun/UsersMapper.xml"></mapper>
    </mappers>
</configuration>    

​ 5 测试框架   在test对应的包下建立  如图

代码如下

/**
 * @author lijun
 * @date 2019/6/28 11:44
 */
public class TestCusom {
    @Test
    public void test(){
        InputStream inputStream = this.getClass().getClassLoader().getResourceAsStream("SqlMapConfig.xml");
        //  创建工厂对象
        System.out.println(inputStream);
        SqlSessionFactoryBuilder sqlSessionFactoryBuilder= new SqlSessionFactoryBuilder();
        System.out.println(sqlSessionFactoryBuilder);
        SqlSessionFactory sessionFactory = sqlSessionFactoryBuilder.build(inputStream);
       SqlSession sqlSession = sessionFactory.openSession();
       System.out.println(sqlSession);
       List<Object> list = sqlSession.selectList("cn.lijun.Dao.Users.findAll");
       for(Object o :list){
           System.out.println(o);
        }
    }
}