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：

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。

 

原文：https://www.cnblogs.com/seve/p/14654104.html