Mybatis三種批量插入數(shù)據(jù)的方式

更新時(shí)間：2021年04月20日 09:49:14 作者：布禾

這篇文章主要介紹了Mybatis的三種批量插入方式，幫助大家更好的理解和學(xué)習(xí)使用Java，感興趣的朋友可以了解下

1. 循環(huán)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);
}

測(cè)試代碼：

@SpringBootTest
class DemoApplicationTests {
	@Resource
	private StudentMapper studentMapper;

	@Test
	public void testInsert(){
		//數(shù)據(jù)生成
		List<Student> studentList = createData(100);

		//循環(huán)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標(biāo)簽

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);
}

測(cè)試代碼：

@SpringBootTest
class DemoApplicationTests {
	@Resource
	private StudentMapper studentMapper;

	@Test
	public void testInsertByForeachTag(){
		//數(shù)據(jù)生成
		List<Student> studentList = createData(100);

		//使用foreach標(biāo)簽，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. 批處理

測(cè)試代碼：

@SpringBootTest
class DemoApplicationTests {
	@Autowired
	private SqlSessionFactory sqlSessionFactory;

	@Test
	public void testInsertBatch(){
		//數(shù)據(jù)生成
		List<Student> studentList = createData(100);

                //使用批處理
		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;
	}
}

三種方式的對(duì)比

MySQL服務(wù)器版本：5.6.4

其他依賴版本如下：

<?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>

三種插入方式在不同數(shù)據(jù)量下的表現(xiàn)，測(cè)試結(jié)果：

插入方式	10條	100條	500條	1000條
循環(huán)插入	496ms	3330ms	15584ms	33755ms
foreach標(biāo)簽	268ms	366ms	392ms	684ms
批處理	222ms	244ms	364ms	426ms

三種方式中，批處理的方式效率是最高的，尤其是在數(shù)據(jù)量大的情況下尤為明顯。

其次是foreach標(biāo)簽，foreach標(biāo)簽是通過拼接SQL語句的方式完成批量操作的。但是當(dāng)拼接的SQL過多，導(dǎo)致SQL大小超過了MySQL服務(wù)器中max_allowed_packet變量的值時(shí)，會(huì)導(dǎo)致操作失敗，拋出PacketTooBigException異常。

最后是循環(huán)插入的方式，這種方式在數(shù)據(jù)量小的時(shí)候可以使用，在數(shù)據(jù)量大的情況下效率要低很多。

以上就是Mybatis的三種批量插入方式的詳細(xì)內(nèi)容，更多關(guān)于Mybatis 批量插入的資料請(qǐng)關(guān)注腳本之家其它相關(guān)文章！

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