java-mybatis环境搭建

 

 

 

首先在iml文件中

 <packaging>jar</packaging>
    <dependencies>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.5</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.26</version>
        </dependency>

        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.2</version>
        </dependency>

        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.12</version>
        </dependency>
    </dependencies>

 

在java目录中建立一个domain实现类User，实现Serializable接口

public class User implements Serializable {
    private Integer id;
    private String username;
    private String password;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", username='" + username + '\'' +
                ", password='" + password + '\'' +
                '}';
    }

 

在rescources文件中建立SqlMapConfig.xml文件

<?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>
<!--    配置环境-->
    <environments default="mysql">
<!--        配置mysql环境-->
        <environment id="mysql">
<!--            配置事务-->
            <transactionManager type="JDBC"></transactionManager>
<!--            配置链接池-->
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://localhost:3306/javaweb1"/>
                <property name="username" value="root"/>
                <property name="password" value="123456"/>
            </dataSource>

        </environment>
    </environments>

<!--    配置映射文件的位置-->
    <mappers>
        <mapper resource="dao/IUserDao.xml"></mapper>
    </mappers>
</configuration>

在resources中建造一个dao文件再IUserDao.xml

<?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">

<!--namespace肯定方法在哪一个Dao接口，id指的是哪一个方法,resultType封装至哪-->
<mapper namespace="dao.IUserDao">
<!--    查询全部操做-->
    <select id="findAll" resultType="dao.IUserDao">
        select * from web1;
    </select>
</mapper>

编写持久层接口IUserDao

public interface IUserDao {
    /**
     * @return
     */
    List<User> findAll();
}

编写测试类

public class MybatisTest {
    /*
    测试查询全部
     */
    @Test
    public void testFindall() throws Exception{
        //1.读取配置文件，生成字节输入流
        InputStream in = Resources.getResourceAsStream("SqlMapConfig.xml");
        //2.获取SqlSessionFactory
        SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(in);
        //3.获取sqlsession对象
        SqlSession sqlSession = factory.openSession();
        //4.获取dao的代理对象
        IUserDao userDao = sqlSession.getMapper(IUserDao.class);
        //5执行查询全部方法
        List<User> users = userDao.findAll();
        for (User user:users){
            System.out.println(user);
        }
        //释放资源
        sqlSession.close();
        in.close();
    }
}

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