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  • 作业5,6 2019/10/23

    上代码:

    IgoodsMapper接口:

      @Select("SELECT * FROM provider p , goods g WHERE p.provider_id = #{provider_id} AND p.provider_id = g.provider_id")
        List<Provider> getProviderlistById(Map <String,Integer> map);

    测试类:

    package com.demo.test;
    
    import com.pojo.Demo;
    import com.pojo.Goods;
    import com.pojo.Grade;
    import com.pojo.Provider;
    import com.test.DemoMapper;
    import com.test.IgoodsMapper;
    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 org.junit.Test;
    
    import java.io.IOException;
    import java.io.InputStream;
    import java.util.HashMap;
    import java.util.List;
    import java.util.Map;
    
    public class Test01 {
        public static void main(String[] args) throws IOException {
            InputStream in = Resources.getResourceAsStream("mybatis-config.xml");
            //2、创建SqlSessionFactory工厂
            SqlSessionFactoryBuilder builder = new SqlSessionFactoryBuilder();
            SqlSessionFactory factory = builder.build(in);
            //3、创建 SqlSession对象
            SqlSession sqlSession = factory.openSession();
            //4、实现方法
            IgoodsMapper mapper = sqlSession.getMapper(IgoodsMapper.class);
    
            Map<String,Integer > map = new HashMap<String, Integer>();
            map.put("provider_id",3001);
            List<Provider> list = sqlSession.selectList("getProviderlistById", map);
    
            for (Provider provider:list){
                System.out.println(provider.getProvider_id()+" "
                        +provider.getProvider_code()+" "
                        +provider.getProvider_name()+" "+provider.getProvider_person()
                        +" "+provider.getProvider_phone()+" "+provider.getGoods_code()
                        +" "+provider.getGoods_name()+" "+provider.getMoney()+" "
                        +provider.getPay_state());
            }
    
    //        if(i>0){
    //            sqlSession.commit();
    //            System.out.println("删除成功");
    //        }else{
    //            System.out.println("删除失败");
    //        }
            //5、释放资源
            sqlSession.close();
            in.close();
    
        }
    
    }
    test01.java

    效果:

    -------------------------------------------------------------------------------------------------------------

    因为这个跟之前的多表查询几乎一样

    所以我就在原来代码进行简单修改:

    IgoodsMapper接口:

      @Select("SELECT * FROM provider p , goods g WHERE g.goods_name LIKE concat('%',#{goods_name},'%') AND p.provider_id = g.provider_id")
        List<Provider> getProviderlistByLikeName(Map <String,String> map);

    测试类:

    package com.demo.test;
    
    import com.pojo.Demo;
    import com.pojo.Goods;
    import com.pojo.Grade;
    import com.pojo.Provider;
    import com.test.DemoMapper;
    import com.test.IgoodsMapper;
    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 org.junit.Test;
    
    import java.io.IOException;
    import java.io.InputStream;
    import java.util.HashMap;
    import java.util.List;
    import java.util.Map;
    
    public class Test01 {
        public static void main(String[] args) throws IOException {
            InputStream in = Resources.getResourceAsStream("mybatis-config.xml");
            //2、创建SqlSessionFactory工厂
            SqlSessionFactoryBuilder builder = new SqlSessionFactoryBuilder();
            SqlSessionFactory factory = builder.build(in);
            //3、创建 SqlSession对象
            SqlSession sqlSession = factory.openSession();
            //4、实现方法
            IgoodsMapper mapper = sqlSession.getMapper(IgoodsMapper.class);
    
            Map<String,String> map = new HashMap<String, String >();
            map.put("goods_name","酒");
            List<Provider> list = sqlSession.selectList("getProviderlistByLikeName", map);
    
            for (Provider provider:list){
                System.out.println(provider.getProvider_id()+" "
                        +provider.getProvider_code()+" "
                        +provider.getProvider_name()+" "+provider.getProvider_person()
                        +" "+provider.getProvider_phone()+" "+provider.getGoods_code()
                        +" "+provider.getGoods_name()+" "+provider.getMoney()+" "
                        +provider.getPay_state());
            }
    
    //        if(i>0){
    //            sqlSession.commit();
    //            System.out.println("删除成功");
    //        }else{
    //            System.out.println("删除失败");
    //        }
            //5、释放资源
            sqlSession.close();
            in.close();
    
        }
    
    }
    test01.java

    结果:

     ------------------------------------------------------------------------------------------------------------------

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  • 原文地址:https://www.cnblogs.com/bichen-01/p/11724924.html
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