Mybatis三种批量插入数据的方式
作者：布禾
这篇文章主要介绍了Mybatis的三种批量插入方式，帮助大家更好的理解和学习使用Java，感兴趣的朋友可以了解下
1. 循环插入
mapper.xml：
<?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.buhe.demo.mapper.StudentMapper">
<insert id="insert" parameterType="Student">
INSERT INTO tb_student (name, age, phone, address, class_id) VALUES (#{name},#{age},#{phone},#{address},#{classId})
</insert>
</mapper>
mapper接口：
public interface StudentMapper {
int insert(Student student);
}
测试代码：
@SpringBootTest
class DemoApplicationTests {
@Resource
private StudentMapper studentMapper;
@Test
public void testInsert(){
//数据生成
List<Student> studentList = createData(100);
//循环插入
long start = System.currentTimeMillis();
studentList.stream().forEach(student -> studentMapper.insert(student));
System.out.println(System.currentTimeMillis() - start);
}
private List<Student> createData(int size){
List<Student> studentList = new ArrayList<>();
Student student;
for(int i = 0; i < size; i++){
student = new Student();
student.setName("小王" + i);
student.setAge(18);
student.setClassId(1);
student.setPhone("1585xxxx669");
student.setAddress("未知");
studentList.add(student);
}
return studentList;
}
}
2. foreach标签
mapper.xml：
<?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.buhe.demo.mapper.StudentMapper">
<insert id="insert" parameterType="Student">
INSERT INTO tb_student (name, age, phone, address, class_id) VALUES (#{name},#{age},#{phone},#{address},#{classId})
</insert>
<insert id="insertBatch">
INSERT INTO tb_student (name, age, phone, address, class_id) VALUES
<foreach collection="list" separator="," item="item">
(#{item.name},#{item.age},#{item.phone},#{item.address},#{item.classId})
</foreach>
</insert>
</mapper>
mapper接口：
public interface StudentMapper {
int insert(Student student);
int insertBatch(List<Student> studentList);
}
测试代码：
@SpringBootTest
class DemoApplicationTests {
@Resource
private StudentMapper studentMapper;
@Test
public void testInsertByForeachTag(){
//数据生成
List<Student> studentList = createData(100);
//使用foreach标签，拼接SQL插入
long start = System.currentTimeMillis();
studentMapper.insertBatch(studentList);
System.out.println(System.currentTimeMillis() - start);
}
private List<Student> createData(int size){
List<Student> studentList = new ArrayList<>();
Student student;
for(int i = 0; i < size; i++){
student = new Student();
student.setName("小王" + i);
student.setAge(18);
student.setClassId(1);
student.setPhone("1585xxxx669");
student.setAddress("未知");
studentList.add(student);
}
return studentList;
}
}
3. 批处理
测试代码：
@SpringBootTest
class DemoApplicationTests {
@Autowired
private SqlSessionFactory sqlSessionFactory;
@Test
public void testInsertBatch(){
//数据生成
List<Student> studentList = createData(100);
//使用批处理
long start = System.currentTimeMillis();
SqlSession sqlSession = sqlSessionFactory.openSession(ExecutorType.BATCH,false);
StudentMapper studentMapperNew = sqlSession.getMapper(StudentMapper.class);
studentList.stream().forEach(student -> studentMapperNew.insert(student));
sqlSession.commit();
sqlSession.clearCache();
System.out.println(System.currentTimeMillis() - start);
}
private List<Student> createData(int size){
List<Student> studentList = new ArrayList<>();
Student student;
for(int i = 0; i < size; i++){
student = new Student();
student.setName("小王" + i);
student.setAge(18);
student.setClassId(1);
student.setPhone("1585xxxx669");
student.setAddress("未知");
studentList.add(student);
}
return studentList;
}
}
三种方式的对比
MySQL服务器版本：5.6.4
其他依赖版本如下：
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.4.4</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.buhe</groupId> <artifactId>demo</artifactId> <version>0.0.1-SNAPSHOT</version> <name>demo</name> <description>Demo project for Spring Boot</description> <properties> <java.version>1.8</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.41</version> </dependency> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>1.3.1</version> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> <resources> <resource> <directory>src/main/java</directory> <includes> <include>**/*.xml</include> </includes> </resource> </resources> </build> </project>
三种插入方式在不同数据量下的表现，测试结果：
| 插入方式 | 10条 | 100条 | 500条 | 1000条 |
|---|---|---|---|---|
| 循环插入 | 496ms | 3330ms | 15584ms | 33755ms |
| foreach标签 | 268ms | 366ms | 392ms | 684ms |
| 批处理 | 222ms | 244ms | 364ms | 426ms |
三种方式中，批处理的方式效率是最高的，尤其是在数据量大的情况下尤为明显。
其次是foreach标签，foreach标签是通过拼接SQL语句的方式完成批量操作的。但是当拼接的SQL过多，导致SQL大小超过了MySQL服务器中max_allowed_packet变量的值时，会导致操作失败，抛出PacketTooBigException异常。
最后是循环插入的方式，这种方式在数据量小的时候可以使用，在数据量大的情况下效率要低很多。
以上就是Mybatis的三种批量插入方式的详细内容，更多关于Mybatis 批量插入的资料请关注脚本之家其它相关文章！