如何快速向数据库加入10万条数据

1、程序连接数据库，使用c3p0线程池；

2、程序使用线程池，多线程编程；

3、采用Fork/Join框架线程池（工作窃取（work-stealing）算法），更高效的多线程编程算法。

直接贴代码，代码举例中，近用小规模数据模拟大数据下的数据库批量插入操作。

1、数据库连接池

package com.example.jdbcConnection;

import com.mchange.v2.c3p0.ComboPooledDataSource;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

/**
 * Created by Liuxd on 2018/8/19.
 */
public class TestC3p0 {

    private static Connection conn;
    private static ComboPooledDataSource dataSource;

    static {
        try {
            //获得c3p0连接池对象
            dataSource = new ComboPooledDataSource();

            dataSource.setUser("root");
            dataSource.setPassword("root");
            dataSource.setJdbcUrl("jdbc:mysql://127.0.0.1:3306/foo?autoReconnect=true&useUnicode=true&characterEncoding=UTF-8&serverTimezone=GMT%2b8&useSSL=false");
            dataSource.setDriverClass("com.mysql.jdbc.Driver");
            dataSource.setInitialPoolSize(2);//初始化池大小
            dataSource.setMaxIdleTime(30);//最大空闲时间
            dataSource.setMaxPoolSize(20);//最多连接数
            dataSource.setMinPoolSize(2);//最少连接数
            dataSource.setMaxStatements(50);//每次最多可以执行多少个批处理语句

        } catch (Exception e) {
            e.printStackTrace();
        }
    }


    /**
     * 查询
     */
    private static List<Object[]> query() {

        List<Object[]> list = new ArrayList<Object[]>();
        try {

            // 获取数据库连接
            conn = dataSource.getConnection();
            // 查询sql
            String sql = "select * from user";


            // 读取数据
            PreparedStatement preparedStatement = conn.prepareStatement(sql);
            //结果集
            ResultSet resultSet = preparedStatement.executeQuery();

            while (resultSet.next()) {
                int uid = resultSet.getInt("uid");
                String name = resultSet.getString("name");
                Integer age = resultSet.getInt("age");
                String phone = resultSet.getString("phone");
                String passwd = resultSet.getString("passwd");

                Object[] objects = new Object[]{uid, name, age, phone, passwd};

                list.add(objects);
            }

            resultSet.close();
            preparedStatement.close();
            //Connection连接对象归还数据库连接池
            conn.close();

        } catch (Exception e) {
            e.printStackTrace();
        }

        return list;
    }


    /**
     * 新增
     */
    public static void add(String name, int age, String phone, String passwd) {

        try {

            // 获取数据库连接
            conn = dataSource.getConnection();

            String insertSql = "insert into `user` (`name`, `age`, `phone`, `passwd`) values(?,?,?,?)";

            PreparedStatement ps = conn.prepareStatement(insertSql);
            ps.setString(1, name);
            ps.setInt(2, age);
            ps.setString(3, phone);
            ps.setString(4, passwd);
            int row = ps.executeUpdate();

            System.out.println("新增结果： " + row);


            ps.close();
            //Connection连接对象归还数据库连接池
            conn.close();

        } catch (Exception e) {
            e.printStackTrace();
        }

    }

    /**
     * 修改
     */
    private static void update(int uid, String name, int age, String phone, String passwd) {

        try {

            // 获取数据库连接
            conn = dataSource.getConnection();

            String updateSql = "UPDATE USER t SET t.name=? ,t.age=?,t.phone=?,t.passwd=? WHERE t.uid=?";

            PreparedStatement preparedStatement = conn.prepareStatement(updateSql);
            preparedStatement.setString(1, name);
            preparedStatement.setInt(2, age);
            preparedStatement.setString(3, phone);
            preparedStatement.setString(4, passwd);
            preparedStatement.setLong(5, uid);
//          执行sql
            preparedStatement.executeUpdate();

            int row = preparedStatement.executeUpdate();

            System.out.println("修改结果： " + row);

            //Connection连接对象归还数据库连接池
            conn.close();
            preparedStatement.close();

        } catch (Exception e) {
            e.printStackTrace();
        }

    }


    /**
     * 删除
     */
    private static void deleteById(int uid) {

        try {

            // 获取数据库连接
            conn = dataSource.getConnection();

            String sql = "delete from USER where uid=?";

            PreparedStatement preparedStatement = conn.prepareStatement(sql);
            preparedStatement.setInt(1, uid);

            int row = preparedStatement.executeUpdate();

            System.out.println("删除结果： " + row);

            preparedStatement.close();
            //Connection连接对象归还数据库连接池
            conn.close();

        } catch (Exception e) {
            e.printStackTrace();
        }

    }


    public static void main(String[] args) {
        /**
         * 1、验证连接数
         */
        for (int i = 0; i < 10; i++) {
            Connection connection = null;
            try {
                connection = dataSource.getConnection();
                System.out.println(connection.toString());
            } catch (SQLException e) {
                e.printStackTrace();
            } finally {
                if (null != connection) {
                    try {
                        connection.close();
                    } catch (SQLException e) {
                        e.printStackTrace();
                    }
                }
            }

        }

        /**
         * 2、查询
         */
        List<Object[]> list = query();

        if (null != list && list.size() > 0) {
            for (int i = 0; i < list.size(); i++) {
                Object[] objects = list.get(i);
                for (int j = 0; j < objects.length; j++) {
                    System.out.print(objects[j] + "    ");
                }
                System.out.println();
            }
        }

        /**
         * 3、新增
         */
        String name = "乐乐";
        int age = 17;
        String phone = "13800138001";
        String passwd = "admin123";
        add(name, age, phone, passwd);

        /**
         * 4、修改
         */
        update(12, name, age, phone, passwd);

        /**
         * 5、删除
         */
        deleteById(3);

    }

}

2、Fork/Join框架类

package com.example.jdbcConnection;

import java.util.concurrent.ForkJoinPool;
import java.util.concurrent.TimeUnit;

/**
 * Created by Liuxd on 2018/8/23.
 */
public class TestForkJoinPool {

    public static void main(String[] args) throws Exception {
        System.out.println("*****************************程序开始执行*****************************");
        // 创建线程池，包含Runtime.getRuntime().availableProcessors()返回值作为个数的并行线程的ForkJoinPool
        ForkJoinPool forkJoinPool = new ForkJoinPool();

        TestC3p0 testC3p0 = new TestC3p0();

        // 提交可拆分的Task任务
        forkJoinPool.submit(new MyTask(0, 1000,testC3p0));

        //阻塞当前线程直到 ForkJoinPool 中所有的任务都执行结束
        forkJoinPool.awaitTermination(2, TimeUnit.SECONDS);

        // 关闭线程池
        forkJoinPool.shutdown();

        System.out.println("*****************************程序执行结束*****************************");
    }

}

3、Task执行类

package com.example.jdbcConnection;


import java.util.concurrent.RecursiveAction;
/**
 *
 * reated by Liuxd on 2018/8/23.
 */
class MyTask extends RecursiveAction {
    // 每个"小任务"最多执行保存20个数
    private static final int MAX = 20;

    private int start;
    private int end;

    private TestC3p0 testC3p0;

    MyTask(int start, int end,TestC3p0 testC3p0) {
        this.start = start;
        this.end = end;
        this.testC3p0=testC3p0;
    }

    @Override
    protected void compute() {
        // 当end-start的值小于MAX时候，开始执行
        if ((end - start) < MAX) {
            for (int i = start; i < end; i++) {
                String name = "乐乐"+i;
                int age = 17+i;
                String phone = "1380013800"+i;
                String passwd = "admin123"+i;
                testC3p0.add(name, age, phone, passwd);
                System.out.println(Thread.currentThread().getName() + "保存"+name+" "+age+" "+" "+phone+" "+passwd);
            }
        } else {
            // 将大任务分解成两个小任务
            int middle = (start + end) / 2;
            MyTask left = new MyTask(start, middle,testC3p0);
            MyTask right = new MyTask(middle, end,testC3p0);

            // 并行执行两个小任务
            left.fork();
            right.fork();
        }
    }
}