动态SQL的sql标签和foreach标签
sql标签
title=#{title},
author=#{author},
update blog
where views=#{views}
注意:使用sql片段主要是为了实现sql片段的复用,如果sql语句涉及到了多表查询,就不建议使用sql片段。总的来说,sql片段适用于单表查询
foreach标签
编写接口
//使用foreach查询
List getBlogForeach(Map map);
编写Mapper文件
实现
public void getBlogForeach(){
SqlSession sqlSession = sqlSessionFactory.getsqlSession();
blogMapper mapper = sqlSession.getMapper(blogMapper.class);
HashMap map = new HashMap();
ArrayList ids = new ArrayList
运行结果
PooledDataSource forcefully closed/removed all connections.
PooledDataSource forcefully closed/removed all connections.
PooledDataSource forcefully closed/removed all connections.
PooledDataSource forcefully closed/removed all connections.
Opening JDBC Connection
Created connection 418958713.
Setting autocommit to false on JDBC Connection [com.mysql.jdbc.JDBC4Connection@18f8cd79]
==> Preparing: select * from blog WHERE ( id=? or id=? )
==> Parameters: 1(Integer), 2(Integer)
<== Columns: id, title, author, create_time, views
<== Row: 1, Mybatis, 小落, 2022-01-26 15:45:58.0, 9999
<== Row: 2, 微服务11, 小落11, 2022-01-26 15:45:58.0, 1000
<== Total: 2
blog(id=1, title=Mybatis, author=小落, createTime=Wed Jan 26 15:45:58 CST 2022, views=9999)
blog(id=2, title=微服务11, author=小落11, createTime=Wed Jan 26 15:45:58 CST 2022, views=1000)
Resetting autocommit to true on JDBC Connection [com.mysql.jdbc.JDBC4Connection@18f8cd79]
Closing JDBC Connection [com.mysql.jdbc.JDBC4Connection@18f8cd79]
Returned connection 418958713 to pool.