MyBatic-04 第一个MyBatis项目


创建一张表

create table stu_tbl(
  id integer primary key auto_increment,
  name varchar(20),
  age integer);

创建一个JavaBean

package com.cd;

public class Student {
    private int id;
    private String name;
    private int age;

    public Student() {
        super();
    }

    public Student(String name, int age) {
        super();
        this.name = name;
        this.age = age;
    }

    public Student(int id, String name, int age) {
        super();
        this.id = id;
        this.name = name;
        this.age = age;
    }

    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
}

创建映射文件

<?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="com.cd.StudentMapper">
  <select id="selectStudent" resultType="com.cd.Student">
    select * from stu_tbl where id = #{id}
  </select>
</mapper>

配置映射文件

<?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>
  <properties resource="com/cd/db.properties"/>
  <environments default="development">
    <environment id="development">
      <transactionManager type="JDBC"/>
      <dataSource type="POOLED">
        <property name="driver" value="${jdbc.driver}"/>
        <property name="url" value="${jdbc.url}"/>
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
      </dataSource>
    </environment>
  </environments>
  <mappers>
    <mapper resource="com/cd/StudentMapper.xml"/>
  </mappers>
</configuration>

查询数据

package com.cd;

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

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

public class Test {
    public static void main(String[] args) {
        String resource = "com/cd/mybatis-config.xml";
        InputStream inputStream;
        try {
            inputStream = (InputStream) Resources.getResourceAsStream(resource);
            SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
            SqlSession session = sqlSessionFactory.openSession();
            Student stu = (Student) session.selectOne("com.cd.StudentMapper.selectStudent", 1);
            System.out.println(stu.getName());
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
}


原文链接:http://codingdict.com/


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