准备:1.表结构CREATE TABLE `t_user` (
`id` varchar(32) CHARACTER SET utf8 NOT NULL COMMENT '主键',
`name` varchar(50) CHARACTER SET utf8 DEFAULT NULL COMMENT '用户名',
`del_flag` char(1) CHARACTER SET utf8 DEFAULT NULL COMMENT '删除标示',
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
2.配置
2.1 jdbc.properties配置
mysql.driver=com.mysql.jdbc.Driver
mysql.url=jdbc:mysql://127.0.0.1:3306/ssm
mysql.username=root
mysql.password=admin
#定义初始连接数
mysql.initialSize=1
#定义最大连接数
mysql.maxActive=20
#定义最大空闲
mysql.maxIdle=20
#定义最小空闲
mysql.minIdle=1
#定义最长等待时间
mysql.maxWait=60000
2.2 spring-mybatis.xml配置
第一种:普通for循环插入
①junit类
@Test
public void testInsertBatch2() throws Exception {
long start = System.currentTimeMillis();
User user;
SqlSession sqlSession = sqlSessionTemplate.getSqlSessionFactory().openSession(false);
UserDao mapper = sqlSession.getMapper(UserDao.class);
for (int i = 0; i < 500; i++) {
user = new User();
user.setId("test" + i);
user.setName("name" + i);
user.setDelFlag("0");
mapper.insert(user);
}
sqlSession.commit();
long end = System.currentTimeMillis();
System.out.println("---------------" + (start - end) + "---------------");
}
②xml配置
INSERT INTO t_user (id, name, del_flag)
VALUES(#{id}, #{name}, #{delFlag})
第二种:mybatis BATCH模式插入
①junit类
@Test
public void testInsertBatch2() throws Exception {
long start = System.currentTimeMillis();
User user;
SqlSession sqlSession = sqlSessionTemplate.getSqlSessionFactory().openSession(ExecutorType.BATCH, false);//跟上述sql区别
UserDao mapper = sqlSession.getMapper(UserDao.class);
for (int i = 0; i < 500; i++) {
user = new User();
user.setId("test" + i);
user.setName("name" + i);
user.setDelFlag("0");
mapper.insert(user);
}
sqlSession.commit();
long end = System.currentTimeMillis();
System.out.println("---------------" + (start - end) + "---------------");
}
②xml配置与第一种②中使用相同
第三种:foreach方式插入
①junit类
@Test
public void testInsertBatch() throws Exception {
long start = System.currentTimeMillis();
List list = new ArrayList<>();
User user;
for (int i = 0; i < 10000; i++) {
user = new User();
user.setId("test" + i);
user.setName("name" + i);
user.setDelFlag("0");
list.add(user);
}
userService.insertBatch(list);
long end = System.currentTimeMillis();
System.out.println("---------------" + (start - end) + "---------------");
}
②xml配置
INSERT INTO t_user
(id, name, del_flag)
VALUES
(#{user.id}, #{user.name}, #{user.delFlag})
特别注意:mysql默认接受sql的大小是1048576(1M),即第三种方式若数据量超过1M会报如下异常:(可通过调整MySQL安装目录下的my.ini文件中[mysqld]段的"max_allowed_packet = 1M")
nested exception is com.mysql.jdbc.PacketTooBigException: Packet for query is too large (5677854 > 1048576).
You can change this value on the server by setting the max_allowed_packet' variable.
结果对比:
时间有限测试数据较少,有兴趣可以自己测试以下。(不清楚为什么BATCH有时候比单条循环插入还耗时间,请知道的大神不吝赐教,感谢!)