Mybatis_2入门程序

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <!DOCTYPE configuration
 3 PUBLIC "-//mybatiis.org//DTD Config 3.0//EN"
 4 "http://mybatis.org//dtd/mybatis-3-config.dtd">
 5 
 6 <configuration>
 7     <environments default="development">
 8         <environment id="development">
 9             <transactionManager type="JDBC" />
10             <dataSource type="POOLED">
11                 <property name="driver" value="com.mysql.jdbc.Driver" />
12                 <property name="url"
13                     value="jdbc:mysql://localhost:3306/mybatis?characterEncoding=utf-8" />
14                 <property name="username" value="root" />
15                 <property name="password" value="root" />
16             </dataSource>
17         </environment>
18     </environments>
19     <!-- mapper文件位置  如果配对了则按住ctrl点击位置会跳跃到文件的位置-->
20     <mappers>
21     <mapper resource="SqlMap/User.xml"/>
22     </mappers>
23 </configuration>

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper
PUBLIC "-//mybatiis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<!--写sql语句 -->
<mapper namespace="test"><!-- 命名空间为了防止select的id相同时不知道用哪个，但是如果两个xml里面的命名空间不同，那么就可以分辨出来，用命名空间.id -->
    <!-- 通过id查询用户  如果有多个select需要用id来区分，用parameterType来设置占位符的格式，resultType来设置返回类型，如果是自动返回，则pojo与数据库里面的表一一对应， mybatis占位符#{}-->
    <select id="findUserById" parameterType="Integer" resultType="com.me.mybatis.pojo.User">
        select * from user where id = #{v}
    </select>
</mapper>

 1 package com.me.mybatis.junit;
 2 
 3 import java.io.InputStream;
 4 
 5 import org.apache.ibatis.io.Resources;
 6 import org.apache.ibatis.session.SqlSession;
 7 import org.apache.ibatis.session.SqlSessionFactory;
 8 import org.apache.ibatis.session.SqlSessionFactoryBuilder;
 9 import org.junit.jupiter.api.Test;
10 
11 import com.me.mybatis.pojo.User;
12 
13 public class MybatisFirstTest {
14 
15     @Test
16     void testMybatis() throws Exception {
17         //加载核心配置文件
18         String resource ="SqlMapConfig.xml";
19         InputStream resourceAsStream = Resources.getResourceAsStream(resource);
20         //创建sqlsessionFactory
21          SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(resourceAsStream);
22          //创建sqlsession
23          SqlSession openSession = sqlSessionFactory.openSession();
24          //执行sql语句
25          User user = openSession.selectOne("test.findUserById", 10);
26          //输出user
27          System.out.println(user);
28     }
29 }

package com.me.mybatis.pojo;
import java.io.Serializable;
import java.util.Date;

public class User implements Serializable {
    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    private int id;//id
    private String username;// 用户姓名
    private String sex;// 性别
    private Date birthday;// 生日
    private String address;// 地址

    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public String getSex() {
        return sex;
    }
    public void setSex(String sex) {
        this.sex = sex;
    }
    public Date getBirthday() {
        return birthday;
    }
    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }
    public String getAddress() {
        return address;
    }
    public void setAddress(String address) {
        this.address = address;
    }
    @Override
    public String toString() {
        return "User [id=" + id + ", username=" + username + ", sex=" + sex
                + ", birthday=" + birthday + ", address=" + address + "]";
    }

    
    

}