MyBatis（二）最简易的增、删、改、查

这篇是承接上一篇的helloWorld程序。首先将一系列初始化的步骤再做一个工厂类进行包装，代码如下：

package com.tinaluo.sun;

import java.io.InputStream;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.*;

public class FKSqlSessionFactory {
    private static SqlSessionFactory sqlSessionFactory=null;
    static{
        try
        {
            InputStream inputStream=Resources.getResourceAsStream("mybatis-config.xml");
            sqlSessionFactory=new SqlSessionFactoryBuilder().build(inputStream);
        }
        catch(Exception e)
        {
            e.printStackTrace();
        }
    }
    public static SqlSession getSqlSession()
    {
        return sqlSessionFactory.openSession();
    }
    public static SqlSessionFactory getSqlSessionFactory()
    {
        return sqlSessionFactory;
    }
}

UserMapper.xml文件修改后：

<?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="org.fkit.mapper.UserMapper">
    <!-- 增加 -->
    <insert id="saveUser" parameterType="com.tinaluo.sun.User"
        useGeneratedKeys="true">
        insert into tb_user(name,sex,age)
        values(#{name},#{sex},#{age})
    </insert>
    <!-- 查找 -->
    <select id="selectUser" parameterType="int" resultType="com.tinaluo.sun.User">
        select *
        from tb_user where id=#{id}
    </select>
    <!-- 更新 -->
    <update id="modifyUser" parameterType="com.tinaluo.sun.User">
        update tb_user set
        name=#{name},sex=#{sex},age=#{age} where id=#{id}
    </update>
    <!-- 删除 -->
    <delete id="removeUser" parameterType="int">
        delete from tb_user where
        id=#{id}
    </delete>
</mapper>

目录结构如下：