有3种实现方式：foreach，spring事务，以及ExecutorType.BATCH.
1. foreach方式
这种方式实际是对SQL语句进行拼接，生成一个长长的SQL，对很多变量进行绑定。如果数据量不大（1000个以内），可以用这种方式。如果数据量太大，可能数据库会报错。
- 定义接口
public interface StudentMapper05 {
public void insertStudent(List<Student> studentList);
}- 定义mapper
适用于Oracle数据库
<insert id="insertStudent">
BEGIN
<foreach collection="list" item="student" index="index" separator="">
INSERT INTO test_student(ID, NAME, BRANCH, PERCENTAGE, PHONE, EMAIL)
VALUES
(SEQ_ID.nextval, #{student.name}, #{student.branch}, #{student.percentage}, #{student.phone}, #{student.email});
</foreach>
END;
</insert>这个mapper的含义，就是把上送的studentList拼接成一个长SQL，拼成的SQL类似：
BEGIN
INSERT INTO test_student(ID, NAME, BRANCH, PERCENTAGE, PHONE, EMAIL) VALUES (SEQ_ID.nextval, ?, ?, ?, ?, ?);
INSERT INTO test_student(ID, NAME, BRANCH, PERCENTAGE, PHONE, EMAIL) VALUES (SEQ_ID.nextval, ?, ?, ?, ?, ?);
INSERT INTO test_student(ID, NAME, BRANCH, PERCENTAGE, PHONE, EMAIL) VALUES (SEQ_ID.nextval, ?, ?, ?, ?, ?);
...
END;studentList有几个，就会生成多少个insert语句拼接到一起，每个?都会进行变量绑定，所以当studentList中数据量较多时，生成的SQL会很长，导致数据库执行报错。
- dao
public class StudentDao05 {
private StudentMapper05 studentMapper; // 省略getter和setter
public void insertStudentList(List<Student> studentList) {
studentMapper.insertStudent(studentList);
}
}- beans
mybatis-spring-05.xml:
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="oracleDataSource" />
<property name="configLocation" value="classpath:mybatis/config/mybatis-config-05.xml"/>
</bean>
<bean id="studentMapper05" class="org.mybatis.spring.mapper.MapperFactoryBean">
<property name="mapperInterface" value="com.ws.experiment.spring.mybatis.mapper.StudentMapper05" />
<property name="sqlSessionFactory" ref="sqlSessionFactory" />
</bean>
<bean id="studentDao05" class="com.ws.experiment.spring.mybatis.dao.StudentDao05">
<property name="studentMapper" ref="studentMapper05" />
</bean>- main函数
public static void main(String[] args) {
String[] configFiles = new String[]{"spring-beans-config.xml", "mybatis/mybatis-spring-05.xml"}; // 分别配置datasource和mybatis相关bean
ApplicationContext context = new ClassPathXmlApplicationContext(configFiles);
StudentDao05 studentDao = (StudentDao05)context.getBean("studentDao05");
int counts[] = new int[]{10, 50, 100, 200, 500, 1000, 2000, 3000, 5000, 8000};
for (int count : counts) {
List<Student> studentList = new ArrayList<>();
for (int i = 0; i < count; i++) {
Student st = new Student();
st.setName("name");
st.setBranch("");
st.setEmail("");
st.setPercentage(0);
st.setPhone(0);
studentList.add(st);
}
long startTime = System.currentTimeMillis();
studentDao.insertStudentList(studentList);
long endTime = System.currentTimeMillis();
System.out.println("插入" + count + "笔数据耗时: " + (endTime - startTime) +" ms");
}
}- 测试结果
插入100笔数据耗时: 197 ms
插入200笔数据耗时: 232 ms
插入500笔数据耗时: 421 ms
插入1000笔数据耗时: 650 ms
插入2000笔数据耗时: 1140 ms
插入3000笔数据耗时: 27113 ms
插入5000笔数据耗时: 98213 ms
插入8000笔数据耗时: 301101 ms2. 借助spring事务
借助spring事务，插入一组数据
- 开启spring事务
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="oracleDataSource" />
</bean>
<tx:annotation-driven transaction-manager="transactionManager" />- 定义接口
public interface StudentMapper06 {
public void insertStudent(@Param("student") Student student);
}- mapper
<insert id="insertStudent">
INSERT INTO test_student(ID, NAME, BRANCH, PERCENTAGE, PHONE, EMAIL)
VALUES
(SEQ_ID.nextval, #{student.name}, #{student.branch}, #{student.percentage}, #{student.phone}, #{student.email})
</insert>- dao
public class StudentDao06 {
private StudentMapper06 studentMapper; // 省略getter和setter
@Transactional // spring事务控制
public void insertStudentList(List<Student> students) {
for (Student student : students) {
studentMapper.insertStudent(student);
}
}
}- beans
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="oracleDataSource" />
<property name="configLocation" value="classpath:mybatis/config/mybatis-config-06.xml"/>
</bean>
<bean id="studentMapper06" class="org.mybatis.spring.mapper.MapperFactoryBean">
<property name="mapperInterface" value="com.ws.experiment.spring.mybatis.mapper.StudentMapper06" />
<property name="sqlSessionFactory" ref="sqlSessionFactory" />
</bean>
<bean id="studentDao06" class="com.ws.experiment.spring.mybatis.dao.StudentDao06">
<property name="studentMapper" ref="studentMapper06" />
</bean>- main
略
- 测试结果
batchInsert001插入10笔数据耗时: 602 ms
batchInsert001插入50笔数据耗时: 196 ms
batchInsert001插入100笔数据耗时: 284 ms
batchInsert001插入200笔数据耗时: 438 ms
batchInsert001插入500笔数据耗时: 944 ms
batchInsert001插入1000笔数据耗时: 1689 ms
batchInsert001插入2000笔数据耗时: 3138 ms
batchInsert001插入3000笔数据耗时: 4427 ms
batchInsert001插入5000笔数据耗时: 7368 ms
batchInsert001插入8000笔数据耗时: 11832 ms3. 使用ExecutorType.BATCH
基本原理是SqlSession sqlSession = sqlSessionFactory.openSession(ExecutorType.BATCH, false);，设置BATCH方式的sqlSession
有三种设置方式：
3.1 在mybatis的config文件中设置
SqlSessionFactoryBean中可以配置配置文件：
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="oracleDataSource" />
<property name="configLocation" value="classpath:mybatis/config/mybatis-config-06.xml"/>
</bean>这个mybatis配置文件中，设置BATCH方式:
<configuration>
<settings>
<!-- 默认打开BATCH的Executor -->
<setting name="defaultExecutorType" value="BATCH" />
</settings>
<mappers>
<mapper class="com.ws.experiment.spring.mybatis.mapper.StudentMapper06" />
</mappers>
</configuration>这样，默认打开的sqlSession就都是BATCH方式的。再与spring的事务结合（参看上一节中的spring事务设置），就可以实现批量插入。
测试结果:
batchInsert001插入10笔数据耗时: 565 ms
batchInsert001插入50笔数据耗时: 117 ms
batchInsert001插入100笔数据耗时: 98 ms
batchInsert001插入200笔数据耗时: 106 ms
batchInsert001插入500笔数据耗时: 145 ms
batchInsert001插入1000笔数据耗时: 132 ms
batchInsert001插入2000笔数据耗时: 154 ms
batchInsert001插入3000笔数据耗时: 163 ms
batchInsert001插入5000笔数据耗时: 200 ms
batchInsert001插入8000笔数据耗时: 250 ms3.2 自己创建sqlSession，手工commit
SqlSessionFactory sqlSessionFactory = (SqlSessionFactory)context.getBean("sqlSessionFactory");
SqlSession sqlSession = sqlSessionFactory.openSession(ExecutorType.BATCH, false);
StudentMapper06 studentMapper = sqlSession.getMapper(StudentMapper06.class);
for (int i = 0; i < count; i++) {
Student st = new Student();
st.setName("name");
...
studentMapper.insertStudent(st);
}
sqlSession.commit();
sqlSession.clearCache();
sqlSession.close();测试结果:
batchInsert002插入10笔数据耗时: 568 ms
batchInsert002插入50笔数据耗时: 157 ms
batchInsert002插入100笔数据耗时: 132 ms
batchInsert002插入200笔数据耗时: 135 ms
batchInsert002插入500笔数据耗时: 148 ms
batchInsert002插入1000笔数据耗时: 139 ms
batchInsert002插入2000笔数据耗时: 151 ms
batchInsert002插入3000笔数据耗时: 139 ms
batchInsert002插入5000笔数据耗时: 207 ms
batchInsert002插入8000笔数据耗时: 299 ms3.3 使用sqlSessionTemplate在XML文件中创建bean
创建一个SqlSessionTemplate，然后注入到MapperFactoryBean中，生成对应的mapper:
<!-- 以ExecutorType.BATCH方式插入数据库 -->
<bean id="batchSqlSessionTemplate" class="org.mybatis.spring.SqlSessionTemplate">
<constructor-arg name="sqlSessionFactory" ref="sqlSessionFactory" />
<constructor-arg name="executorType" value="BATCH" />
</bean>
<bean id="studentMapper06_batch" class="org.mybatis.spring.mapper.MapperFactoryBean">
<property name="mapperInterface" value="com.ws.experiment.spring.mybatis.mapper.StudentMapper06" />
<property name="sqlSessionTemplate" ref="batchSqlSessionTemplate" />
</bean>
<bean id="studentDao06_batch" class="com.ws.experiment.spring.mybatis.dao.StudentDao06">
<property name="studentMapper" ref="studentMapper06_batch" />
</bean>与spring的事务结合后（参看上一节中的spring事务设置），就可以实现批量插入
测试结果
batchInsert003插入10笔数据耗时: 651 ms
batchInsert003插入50笔数据耗时: 133 ms
batchInsert003插入100笔数据耗时: 124 ms
batchInsert003插入200笔数据耗时: 129 ms
batchInsert003插入500笔数据耗时: 144 ms
batchInsert003插入1000笔数据耗时: 179 ms
batchInsert003插入2000笔数据耗时: 229 ms
batchInsert003插入3000笔数据耗时: 241 ms
batchInsert003插入5000笔数据耗时: 216 ms
batchInsert003插入8000笔数据耗时: 259 ms
**粗体** _斜体_ [链接](http://example.com) `代码` - 列表 > 引用。你还可以使用@来通知其他用户。