mybatis——参数传递

一、Flowermapper2.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">
<!--参数传递-->
<mapper namespace="com.company.mapper.Flowermapper2">
    <!--parameterType是传的参数的数据类型-->
    <select id="selectOne" resultType="flower" parameterType="int">
        <!--id的值可以进行参数传递  普通类型使用#{prama1}-->
        select * from flower where id=#{param1}
    </select>

    <!--传递多个参数  使用数组或者对象-->
    <select id="selectOne2" resultType="flower" parameterType="flower">
        <!-- id的值可以进行参数传递  对象使用属性名，其实是自动调用get方法-->
        select * from flower where id=#{id} and name = #{name}
    </select>

    <!--传递map存储参数    属性不属于同一个对象时-->
    <select id="selectMap" resultType="flower" parameterType="map">
        <!-- id的值可以进行参数传递  对象使用属性名，其实是自动调用get方法-->
        select * from flower where id=#{a} and name = #{b}
    </select>
</mapper>

二、test

package com.company.test;

import com.company.entity.Flower;
import jdk.nashorn.internal.ir.CallNode;
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 sun.plugin2.os.windows.FLASHWINFO;

import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class testB {
    public static void main(String[] args) throws IOException {

        //解析mybatis.xml文件
        InputStream inputStream = Resources.getResourceAsStream("mybatis.xml");

        //获得session工厂
        SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(inputStream);

        //获得session对象
        SqlSession session = factory.openSession();

        //调用方法
        //参数传递一：传递单个参数
        Flower flower2 = session.selectOne("com.company.mapper.Flowermapper2.selectOne",2);
        System.out.println(flower2);

        //参数传递二：传递对象参数
        Flower flower = new Flower(1, "玫瑰花", 15, "中国");
        Flower flower3 = session.selectOne("com.company.mapper.Flowermapper2.selectOne2",flower);
        System.out.println(flower3);

        //参数传递三：传递map集合
        Map<String,Object> map = new HashMap<>();
        map.put("a",1);
        map.put("b","玫瑰花");
        Flower flower4 = session.selectOne("com.company.mapper.Flowermapper2.selectMap", map);
        System.out.println(flower4);

        //关闭资源
        session.close();
    }
}

一定要在mybatis.xml文件中的中加载mapper文件！！！