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MyBatis快速入门——第四章、mybatis动态sql_foreach


MyBatis快速入门——第四章、mybatis动态sql_foreach_数据库

MyBatis快速入门——第四章、mybatis动态sql_foreach

目录

​​循环测试配【mapper.xml】置文件编写​​

​​DAO层:​​

​​参数传递:​​

​​测试类: ​​

​​查询结果:​​

循环测试配【mapper.xml】置文件编写

我这里便利的是【uuid()】的id,故而是字符串。

<?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.item.mapper.ProductMapper">
<select id="GetInfo" resultType="Product">
select * from product where id in
<foreach collection="array" item="id" index="i" open="(" close=")" separator=",">
"${id}"
</foreach>
</select>

</mapper>

DAO层:

package com.item.dao;

import com.item.common.JDBC;
import com.item.mapper.ProductMapper;
import com.item.model.Product;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;

import java.util.List;

public class ProduceDAO {
/**
* 多个查询
* @param array (字符串id数组)
* @return
*/
public static List<Product> GetInfo(String []array) {
SqlSessionFactory factory = JDBC.GetConn();
SqlSession session = factory.openSession();
ProductMapper db = session.getMapper(ProductMapper.class);
List<Product> list = db.GetInfo(array);
session.close();
return list;
}
}

参数传递:

package com.item.mapper;

import com.item.model.Product;
import org.apache.ibatis.annotations.Param;

import java.util.List;

public interface ProductMapper {
List<Product> GetInfo(@Param("array") String[] array);
}

测试类: 

package com.item.action;

import com.item.dao.ProduceDAO;
import com.item.model.Product;

import java.util.List;

public class Action {
public static void main(String[] args){
String [] array={"b383581fd20211ec84b500e070bfdb54",
"b3839547d20211ec84b500e070bfdb54",
"b383d49dd20211ec84b500e070bfdb54",
"b384180cd20211ec84b500e070bfdb54",
"f6715eb2d20111ec84b500e070bfdb54"};
List<Product> list = ProduceDAO.GetInfo(array);
for (Product p : list) {
System.out.println("编号"+p.getId());
System.out.println("创建时间"+p.getCreateDate());
System.out.println("修改时间"+p.getModifyDate());
System.out.println("产品名称"+p.getProductName());
System.out.println("产品标题"+p.getProductTitle());
System.out.println("产品价格"+p.getProductPrice());
System.out.println("产品数量"+p.getProductCount());
System.out.println("品牌类型"+p.getProductType());
System.out.println("重量"+p.getProductWeight());
System.out.println("状态"+(p.getProductStatus()==1?"上架":"下架"));
}
}
}

查询结果:

MyBatis快速入门——第四章、mybatis动态sql_foreach_开发语言_02

循环的用处可以很多可以进行批量添加、修改、删除等处。


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