有3種實(shí)現(xiàn)方式：foreach，spring事務(wù)，以及ExecutorType.BATCH.

1. foreach方式

這種方式實(shí)際是對SQL語句進(jìn)行拼接，生成一個長長的SQL，對很多變量進(jìn)行綁定。如果數(shù)據(jù)量不大（1000個以內(nèi)），可以用這種方式。如果數(shù)據(jù)量太大，可能數(shù)據(jù)庫會報錯。

定義接口

public interface StudentMapper05 { public void insertStudent(List<Student> studentList);}

定義mapper

適用于Oracle數(shù)據(jù)庫

<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>

這個mapper的含義，就是把上送的studentList拼接成一個長SQL，拼成的SQL類似：

BEGININSERT 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有幾個，就會生成多少個insert語句拼接到一起，每個?都會進(jìn)行變量綁定，所以當(dāng)studentList中數(shù)據(jù)量較多時，生成的SQL會很長，導(dǎo)致數(shù)據(jù)庫執(zhí)行報錯。

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 class='org.mybatis.spring.SqlSessionFactoryBean'> <property name='dataSource' ref='oracleDataSource' /> <property name='configLocation' value='classpath:mybatis/config/mybatis-config-05.xml'/></bean><bean class='org.mybatis.spring.mapper.MapperFactoryBean'> <property name='mapperInterface' value='com.ws.experiment.spring.mybatis.mapper.StudentMapper05' /> <property name='sqlSessionFactory' ref='sqlSessionFactory' /></bean><bean class='com.ws.experiment.spring.mybatis.dao.StudentDao05'> <property name='studentMapper' ref='studentMapper05' /></bean>

main函數(shù)

public static void main(String[] args) { String[] configFiles = new String[]{'spring-beans-config.xml', 'mybatis/mybatis-spring-05.xml'}; // 分別配置datasource和mybatis相關(guān)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 + '筆數(shù)據(jù)耗時: ' + (endTime - startTime) +' ms'); }}

測試結(jié)果

插入100筆數(shù)據(jù)耗時: 197 ms插入200筆數(shù)據(jù)耗時: 232 ms插入500筆數(shù)據(jù)耗時: 421 ms插入1000筆數(shù)據(jù)耗時: 650 ms插入2000筆數(shù)據(jù)耗時: 1140 ms插入3000筆數(shù)據(jù)耗時: 27113 ms插入5000筆數(shù)據(jù)耗時: 98213 ms插入8000筆數(shù)據(jù)耗時: 301101 ms

2. 借助spring事務(wù)

借助spring事務(wù)，插入一組數(shù)據(jù)

開啟spring事務(wù)

<bean class='org.springframework.jdbc.datasource.DataSourceTransactionManager'> <property name='dataSource' ref='oracleDataSource' /></bean><tx:annotation-driven transaction-manager='transactionManager' />

定義接口

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事務(wù)控制 public void insertStudentList(List<Student> students) { for (Student student : students) { studentMapper.insertStudent(student); } }}

beans

<bean class='org.mybatis.spring.SqlSessionFactoryBean'> <property name='dataSource' ref='oracleDataSource' /> <property name='configLocation' value='classpath:mybatis/config/mybatis-config-06.xml'/></bean><bean class='org.mybatis.spring.mapper.MapperFactoryBean'> <property name='mapperInterface' value='com.ws.experiment.spring.mybatis.mapper.StudentMapper06' /> <property name='sqlSessionFactory' ref='sqlSessionFactory' /></bean><bean class='com.ws.experiment.spring.mybatis.dao.StudentDao06'> <property name='studentMapper' ref='studentMapper06' /></bean>

main

略

測試結(jié)果

batchInsert001插入10筆數(shù)據(jù)耗時: 602 msbatchInsert001插入50筆數(shù)據(jù)耗時: 196 msbatchInsert001插入100筆數(shù)據(jù)耗時: 284 msbatchInsert001插入200筆數(shù)據(jù)耗時: 438 msbatchInsert001插入500筆數(shù)據(jù)耗時: 944 msbatchInsert001插入1000筆數(shù)據(jù)耗時: 1689 msbatchInsert001插入2000筆數(shù)據(jù)耗時: 3138 msbatchInsert001插入3000筆數(shù)據(jù)耗時: 4427 msbatchInsert001插入5000筆數(shù)據(jù)耗時: 7368 msbatchInsert001插入8000筆數(shù)據(jù)耗時: 11832 ms

3. 使用ExecutorType.BATCH

基本原理是SqlSession sqlSession = sqlSessionFactory.openSession(ExecutorType.BATCH, false);，設(shè)置BATCH方式的sqlSession

有三種設(shè)置方式：

3.1 在mybatis的config文件中設(shè)置

SqlSessionFactoryBean中可以配置配置文件：

<bean class='org.mybatis.spring.SqlSessionFactoryBean'> <property name='dataSource' ref='oracleDataSource' /> <property name='configLocation' value='classpath:mybatis/config/mybatis-config-06.xml'/></bean>

這個mybatis配置文件中，設(shè)置BATCH方式:

<configuration> <settings> <!-- 默認(rèn)打開BATCH的Executor --> <setting name='defaultExecutorType' value='BATCH' /> </settings> <mappers> <mapper /> </mappers></configuration>

這樣，默認(rèn)打開的sqlSession就都是BATCH方式的。再與spring的事務(wù)結(jié)合（參看上一節(jié)中的spring事務(wù)設(shè)置），就可以實(shí)現(xiàn)批量插入。

測試結(jié)果:

batchInsert001插入10筆數(shù)據(jù)耗時: 565 msbatchInsert001插入50筆數(shù)據(jù)耗時: 117 msbatchInsert001插入100筆數(shù)據(jù)耗時: 98 msbatchInsert001插入200筆數(shù)據(jù)耗時: 106 msbatchInsert001插入500筆數(shù)據(jù)耗時: 145 msbatchInsert001插入1000筆數(shù)據(jù)耗時: 132 msbatchInsert001插入2000筆數(shù)據(jù)耗時: 154 msbatchInsert001插入3000筆數(shù)據(jù)耗時: 163 msbatchInsert001插入5000筆數(shù)據(jù)耗時: 200 msbatchInsert001插入8000筆數(shù)據(jù)耗時: 250 ms

3.2 自己創(chuàng)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();

測試結(jié)果:

batchInsert002插入10筆數(shù)據(jù)耗時: 568 msbatchInsert002插入50筆數(shù)據(jù)耗時: 157 msbatchInsert002插入100筆數(shù)據(jù)耗時: 132 msbatchInsert002插入200筆數(shù)據(jù)耗時: 135 msbatchInsert002插入500筆數(shù)據(jù)耗時: 148 msbatchInsert002插入1000筆數(shù)據(jù)耗時: 139 msbatchInsert002插入2000筆數(shù)據(jù)耗時: 151 msbatchInsert002插入3000筆數(shù)據(jù)耗時: 139 msbatchInsert002插入5000筆數(shù)據(jù)耗時: 207 msbatchInsert002插入8000筆數(shù)據(jù)耗時: 299 ms

3.3 使用sqlSessionTemplate在XML文件中創(chuàng)建bean

創(chuàng)建一個SqlSessionTemplate，然后注入到MapperFactoryBean中，生成對應(yīng)的mapper:

<!-- 以ExecutorType.BATCH方式插入數(shù)據(jù)庫 --><bean class='org.mybatis.spring.SqlSessionTemplate'> <constructor-arg name='sqlSessionFactory' ref='sqlSessionFactory' /> <constructor-arg name='executorType' value='BATCH' /></bean><bean class='org.mybatis.spring.mapper.MapperFactoryBean'> <property name='mapperInterface' value='com.ws.experiment.spring.mybatis.mapper.StudentMapper06' /> <property name='sqlSessionTemplate' ref='batchSqlSessionTemplate' /></bean><bean class='com.ws.experiment.spring.mybatis.dao.StudentDao06'> <property name='studentMapper' ref='studentMapper06_batch' /></bean>

與spring的事務(wù)結(jié)合后（參看上一節(jié)中的spring事務(wù)設(shè)置），就可以實(shí)現(xiàn)批量插入

測試結(jié)果

batchInsert003插入10筆數(shù)據(jù)耗時: 651 msbatchInsert003插入50筆數(shù)據(jù)耗時: 133 msbatchInsert003插入100筆數(shù)據(jù)耗時: 124 msbatchInsert003插入200筆數(shù)據(jù)耗時: 129 msbatchInsert003插入500筆數(shù)據(jù)耗時: 144 msbatchInsert003插入1000筆數(shù)據(jù)耗時: 179 msbatchInsert003插入2000筆數(shù)據(jù)耗時: 229 msbatchInsert003插入3000筆數(shù)據(jù)耗時: 241 msbatchInsert003插入5000筆數(shù)據(jù)耗時: 216 msbatchInsert003插入8000筆數(shù)據(jù)耗時: 259 ms

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