Java工程中使用Mybatis (工程结合Mybatis,数据结合Swing使用）)

2011年6月iBatis 更名为 MyBatis，从 iBatis 到 MyBatis，不只是名称上的变化，MyBatis 提供了更为强大的功能，同时并没有损失其易用性，相反，在很多地方都借助于 JDK 的泛型和注解特性进行了简化。所以你懂的，开始学习就从MyBatis吧．

例子使用MyBatis+Oracle实现一个用户表的查询，如下：

①数据库 在MySQL中，test数据库下，简历user表，字段：iid，ifullname，ipassword，建表语句略。

②需导入的包 只有两个： mybatis-3.4.4.jar 和 ojdbc14.jar（JDBC包）

③目录结构 采用最简单的结构，com.mybatis包下有且仅有四个文件 configuration.xml user.xml User.java Test.java

④mybatis配置文件configuration.xml，

[xml]

<?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>
  <typeAliases>
    <typeAlias alias="User" type="com.mybatis.User"></typeAlias>
  </typeAliases>
  <environments default="development">
    <environment id="development">
      <transactionManager type="JDBC"></transactionManager>
      <dataSource type="POOLED">
        <property name="driver" value="oracle.jdbc.driver.OracleDriver" />
        <property name="url" value="jdbc:oracle:thin:@192.168.0.87:1526:entegor" />
        <property name="username" value="ideal" />
        <property name="password" value="ideal" />
      </dataSource>
    </environment>
  </environments>
  <mappers>
    <mapper resource="user.xml"/>
  </mappers>
</configuration>

User表sql文件User.xml，

[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">
<mapper namespace="User">
  <select id="selectUser" parameterType="int" resultType="User">
    SELECT * FROM user WHERE id = #{id}
  </select>
  <select id="selectUsers" resultType="User">
    SELECT * FROM user
  </select>
</mapper>

表结构文件User.java

package com.mybatis;
public class User {
  private int iid;
  private String ifullname;
  private String iloginname;
  private String ipassword;
  public User(){}
  public User(int id, String name) {
    this.iid = id;
    this.ifullname = name;
  }
  public String getIfullname() {
    return ifullname;
  }
  public int getIid() {
    return iid;
  }
  public void setIid(int iid) {
    this.iid = iid;
  }
  public void setIfullname(String ifullname) {
    this.ifullname = ifullname;
  }
  public String getIloginname() {
    return iloginname;
  }
  public void setIloginname(String iloginname) {
    this.iloginname = iloginname;
  }
  public String getIpassword() {
    return ipassword;
  }
  public void setIpassword(String ipassword) {
    this.ipassword = ipassword;
  }
}

⑦测试用例Test.java

package com.controller;
import java.io.IOException;
import java.io.Reader;
import java.util.List;
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 com.mybatis.User;
public class Test {
  public static void main(String[] args) throws IOException {
    // TODO Auto-generated method stub
    String resource = "configuration.xml";
    Reader reader = Resources.getResourceAsReader(resource);
    SqlSessionFactory ssf = new SqlSessionFactoryBuilder().build(reader);
    SqlSession session = ssf.openSession();
    try{
      User user = session.selectOne("selectUser", 2);
      System.out.println(user.getIfullname());
      System.out.println(user);
      System.out.println("--------------分隔线---------------");
      List<User> users = session.selectList("selectUsers");
      for(int i=0; i<users.size(); i++) {
        System.out.println(users.get(i).getIfullname());
      }
    } catch (Exception e) {
      e.printStackTrace();
    } finally {
      session.close();
    }
  }
}