1.引入jar
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>4.3.25.RELEASE</version>
</dependency>
2.因为是在spring和springmvc，maven下作测试，所以测试类代码必须加入以下注解（重点）若不加入，junit提示空指针异常。
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = { "classpath:applicationContext.xml" })
public class FirstRun {
@Autowired
private SqlSessionTemplate sqlSessionTemplate;
}
3.在spring的配置文件中，配置一个SqlSessionTemplate的类。并且把执行类型，设置为batch
<bean id="sqlSessionTemplate"
class="org.mybatis.spring.SqlSessionTemplate" >
<constructor-arg name="sqlSessionFactory"
ref="sqlSessionFactorybean"></constructor-arg>
<constructor-arg name="executorType" value="BATCH"></constructor-arg>
</bean>
4.测试类，重点，在写测试类时，将测试类，写入到src/main/java/cn/taotao/test/，下，而不是src/test/java下。否则出一堆的找不到资源文件错误。
在java中，自动装载sqlSessionTemplate，然后用它取得sessionFactory，然后打开session并设置不自动提交，得到sqlSession对象。然后用sqlSession对象，获取getmapper，然后做插入测试，之后手动提交。最后关闭session。
在参考的尚硅谷的教学资料视频中，这个地方讲错了。他装载引用的private Sqlsession sqlsession，如果用这样，就没法获得getSqlSessionFactory，进而，没法设置手动提交。
5.java代码如下，4万次插入。单位毫秒。实践表明批处理即使有提升，但是效果不大。
普通版本执行时长66825
批处理执行时长57756
原生态批处理执行时长4543
package cn.taotao.test;
import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.UUID;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.ExecutorType;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mybatis.spring.SqlSessionTemplate;
import org.mybatis.spring.SqlSessionUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import cn.taotao.bean.Employee;
import cn.taotao.dao.EmployeeMapper;
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = { "classpath:applicationContext.xml" })
public class FirstRun {
// private SqlSessionTemplate sqlSessionTemplate;
@Autowired
private SqlSessionTemplate sqlSessionTemplate;
@Test
public void First() throws IOException, SQLException {
SqlSession sqlSession = sqlSessionTemplate.getSqlSessionFactory().openSession(ExecutorType.BATCH, false);
long start = System.currentTimeMillis();
try {
EmployeeMapper mapper = sqlSession.getMapper(EmployeeMapper.class);
int size = 40000;
for (int i = 0; i < size; i++) {
mapper.insert(new Employee(UUID.randomUUID().toString().substring(0, 5), "b", "1", 1));
if (i % 1000 == 0 || i == size - 1) {
//手动每1000个一提交，提交后无法回滚
sqlSession.commit();
//清理缓存，防止溢出
sqlSession.clearCache(); }
}
long end = System.currentTimeMillis();
System.out.println("批处理执行时长" + (end - start));
} finally {
sqlSession.close();
}
}
@Autowired
private EmployeeMapper empMapper;
@Test
public void Second() {
long start = System.currentTimeMillis();
for (int i = 0; i < 40000; i++) {
empMapper.insert(new Employee(UUID.randomUUID().toString().substring(0, 5), "b", "1", 1));
}
long end = System.currentTimeMillis();
System.out.println("普通版本执行时长" + (end - start));
}
@Test
public void Third() throws Exception {
String resource = "mybatis-config.xml";
InputStream inputStream = Resources.getResourceAsStream(resource);
SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
SqlSession openSession = sqlSessionFactory.openSession(ExecutorType.BATCH, false);
long start = System.currentTimeMillis();
try {
EmployeeMapper mapper = openSession.getMapper(EmployeeMapper.class);
for (int i = 0; i < 40000; i++) {
mapper.insert(new Employee(UUID.randomUUID().toString().substring(0, 5), "b", "1", 1));
}
openSession.commit();
long end = System.currentTimeMillis();
// 批量保存执行后的时间
System.out.println("原生态批处理执行时长" + (end - start));
} finally {
openSession.close();
}
}
}