之前我們學習了利用mybatis進行了模糊查詢。本節學習使用mybatis進行多條件查詢。下面就主要步驟進行一些闡述

1.準備Category.xml

主要查詢代碼是：

<select id="listCategoryByIdAndName" parameterType="map" resultType="Category">
            select * from category_ where id>#{id} and name like concat('%',#{name},'%')
</select>

加上約束后完整的xml文件為：

<?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.how2java.pojo">
        <select id="listCategoryByIdAndName" parameterType="map" resultType="Category">
            select * from category_ where id>#{id} and name like concat('%',#{name},'%')
        </select>
    </mapper>

2.書寫TestMybatis.java

package com.how2java.pojo;

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

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 TestMybatis { 
    public static void main(String[] args) throws IOException {
        String resource="mybatis-config.xml";
        InputStream inputStream=Resources.getResourceAsStream(resource);
        SqlSessionFactory sqlSessionFactory=new SqlSessionFactoryBuilder().build(inputStream);
        SqlSession sqlSession=sqlSessionFactory.openSession();
        
        Map<String,Object> params=new HashMap<>();
        params.put("id", 3);
        params.put("name", "cat");
        List<Category> cs=sqlSession.selectList("listCategoryByIdAndName",params);
        for(Category c:cs) {
            System.out.println(c.getName());
        }
        /*List<Category> cs = sqlSession.selectList("listCategoryByName","cat");
        for (Category c : cs) {
            System.out.println(c.getName());
        }*/
        /*Category c=new Category();
        c.setName("新增加的Category");
        sqlSession.insert("addCategory",c);
        listAll(sqlSession);*/
        sqlSession.commit();
        sqlSession.close();
    }
    public static void listAll(SqlSession session) {
        List<Category> categories=session.selectList("listCategory");
        for (Category c : categories) {
            System.out.println(c.getName());
        }
    }
}

數據庫表結構為：

表結構.PNG

測試結果如下：

新增加的Category