耗时8个月联合打造 《 2023年Java高薪课程 》,已更新了 102G 视频,累计更新时长 500+ 个小时,需要的小伙伴可以了解下,一次购买,持续更新,无需2次付费。
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CREATE TABLE `t_user` (
`id` int(11) NOT NULL AUTO_INCREMENT COMMENT '用户id',
`username` varchar(64) DEFAULT NULL COMMENT '用户名称',
`age` int(4) DEFAULT NULL COMMENT '年龄',
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='用户信息表';
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/**
* <p>用户实体</p>
*
* @Author zjq
*/
@Data
public class User {
private int id;
private String username;
private int age;
}
public interface UserMapper {
/**
* 批量插入用户
* @param userList
*/
void batchInsertUser(@Param("list") List<User> userList);
}
<!-- 批量插入用户信息 -->
<insert id="batchInsertUser" parameterType="java.util.List">
insert into t_user(username,age) values
<foreach collection="list" item="item" index="index" separator=",">
(
#{item.username},
#{item.age}
)
</foreach>
</insert>
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/test
jdbc.username=root
jdbc.password=root
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<!--通过properties标签加载外部properties文件-->
<properties resource="jdbc.properties"></properties>
<!--自定义别名-->
<typeAliases>
<typeAlias type="com.zjq.domain.User" alias="user"></typeAlias>
</typeAliases>
<!--数据源环境-->
<environments default="developement">
<environment id="developement">
<transactionManager type="JDBC"></transactionManager>
<dataSource type="POOLED">
<property name="driver" value="${jdbc.driver}"/>
<property name="url" value="${jdbc.url}"/>
<property name="username" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
</dataSource>
</environment>
</environments>
<!--加载映射文件-->
<mappers>
<mapper resource="com/zjq/mapper/UserMapper.xml"></mapper>
</mappers>
</configuration>
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@Test
public void testBatchInsertUser() throws IOException {
InputStream resourceAsStream =
Resources.getResourceAsStream("sqlMapConfig.xml");
SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(resourceAsStream);
SqlSession session = sqlSessionFactory.openSession();
System.out.println("===== 开始插入数据 =====");
long startTime = System.currentTimeMillis();
try {
List<User> userList = new ArrayList<>();
for (int i = 1; i <= 300000; i++) {
User user = new User();
user.setId(i);
user.setUsername("共饮一杯无 " + i);
user.setAge((int) (Math.random() * 100));
userList.add(user);
}
session.insert("batchInsertUser", userList); // 最后插入剩余的数据
session.commit();
long spendTime = System.currentTimeMillis()-startTime;
System.out.println("成功插入 30 万条数据,耗时:"+spendTime+"毫秒");
} finally {
session.close();
}
}
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/**
* 新增单个用户
* @param user
*/
void insertUser(User user);
<!-- 新增用户信息 -->
<insert id="insertUser" parameterType="user">
insert into t_user(username,age) values
(
#{username},
#{age}
)
</insert>
@Test
public void testCirculateInsertUser() throws IOException {
InputStream resourceAsStream =
Resources.getResourceAsStream("sqlMapConfig.xml");
SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(resourceAsStream);
SqlSession session = sqlSessionFactory.openSession();
System.out.println("===== 开始插入数据 =====");
long startTime = System.currentTimeMillis();
try {
for (int i = 1; i <= 300000; i++) {
User user = new User();
user.setId(i);
user.setUsername("共饮一杯无 " + i);
user.setAge((int) (Math.random() * 100));
// 一条一条新增
session.insert("insertUser", user);
session.commit();
}
long spendTime = System.currentTimeMillis()-startTime;
System.out.println("成功插入 30 万条数据,耗时:"+spendTime+"毫秒");
} finally {
session.close();
}
}
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-- 清空用户表
TRUNCATE table t_user;
/**
* 分批次批量插入
* @throws IOException
*/
@Test
public void testBatchInsertUser() throws IOException {
InputStream resourceAsStream =
Resources.getResourceAsStream("sqlMapConfig.xml");
SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(resourceAsStream);
SqlSession session = sqlSessionFactory.openSession();
System.out.println("===== 开始插入数据 =====");
long startTime = System.currentTimeMillis();
int waitTime = 10;
try {
List<User> userList = new ArrayList<>();
for (int i = 1; i <= 300000; i++) {
User user = new User();
user.setId(i);
user.setUsername("共饮一杯无 " + i);
user.setAge((int) (Math.random() * 100));
userList.add(user);
if (i % 1000 == 0) {
session.insert("batchInsertUser", userList);
// 每 1000 条数据提交一次事务
session.commit();
userList.clear();
// 等待一段时间
Thread.sleep(waitTime * 1000);
}
}
// 最后插入剩余的数据
if(!CollectionUtils.isEmpty(userList)) {
session.insert("batchInsertUser", userList);
session.commit();
}
long spendTime = System.currentTimeMillis()-startTime;
System.out.println("成功插入 30 万条数据,耗时:"+spendTime+"毫秒");
} catch (Exception e) {
e.printStackTrace();
} finally {
session.close();
}
}
/**
* 分批次批量插入
* @throws IOException
*/
@Test
public void testBatchInsertUser() throws IOException {
InputStream resourceAsStream =
Resources.getResourceAsStream("sqlMapConfig.xml");
SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(resourceAsStream);
SqlSession session = sqlSessionFactory.openSession();
System.out.println("===== 开始插入数据 =====");
long startTime = System.currentTimeMillis();
int waitTime = 10;
try {
List<User> userList = new ArrayList<>();
for (int i = 1; i <= 300000; i++) {
User user = new User();
user.setId(i);
user.setUsername("共饮一杯无 " + i);
user.setAge((int) (Math.random() * 100));
userList.add(user);
if (i % 1000 == 0) {
session.insert("batchInsertUser", userList);
// 每 1000 条数据提交一次事务
session.commit();
userList.clear();
}
}
// 最后插入剩余的数据
if(!CollectionUtils.isEmpty(userList)) {
session.insert("batchInsertUser", userList);
session.commit();
}
long spendTime = System.currentTimeMillis()-startTime;
System.out.println("成功插入 30 万条数据,耗时:"+spendTime+"毫秒");
} catch (Exception e) {
e.printStackTrace();
} finally {
session.close();
}
}
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/**
* JDBC分批次批量插入
* @throws IOException
*/
@Test
public void testJDBCBatchInsertUser() throws IOException {
Connection connection = null;
PreparedStatement preparedStatement = null;
String databaseURL = "jdbc:mysql://localhost:3306/test";
String user = "root";
String password = "root";
try {
connection = DriverManager.getConnection(databaseURL, user, password);
// 关闭自动提交事务,改为手动提交
connection.setAutoCommit(false);
System.out.println("===== 开始插入数据 =====");
long startTime = System.currentTimeMillis();
String sqlInsert = "INSERT INTO t_user ( username, age) VALUES ( ?, ?)";
preparedStatement = connection.prepareStatement(sqlInsert);
Random random = new Random();
for (int i = 1; i <= 300000; i++) {
preparedStatement.setString(1, "共饮一杯无 " + i);
preparedStatement.setInt(2, random.nextInt(100));
// 添加到批处理中
preparedStatement.addBatch();
if (i % 1000 == 0) {
// 每1000条数据提交一次
preparedStatement.executeBatch();
connection.commit();
System.out.println("成功插入第 "+ i+" 条数据");
}
}
// 处理剩余的数据
preparedStatement.executeBatch();
connection.commit();
long spendTime = System.currentTimeMillis()-startTime;
System.out.println("成功插入 30 万条数据,耗时:"+spendTime+"毫秒");
} catch (SQLException e) {
System.out.println("Error: " + e.getMessage());
} finally {
if (preparedStatement != null) {
try {
preparedStatement.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (connection != null) {
try {
connection.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}
-
获取数据库连接。 -
创建 Statement 对象。 -
定义 SQL 语句,使用 PreparedStatement 对象预编译 SQL 语句并设置参数。 -
执行批处理操作。 -
处理剩余的数据。 -
关闭 Statement 和 Connection 对象。
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【福利】2023 高薪课程,全面来袭(视频+笔记+源码)
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