postgresql vs mongo vs mysql

前几天看了一篇文章<High Performance JSON PostgreSQL vs. MongoDB> 发布在Percona Live Europe 2017

作者是<Dominic Dwyer Wei Shan Ang>,作者的观点是PostgreSQL更好，恰巧没有玩过postgresql，仅仅听说过。

码农的第一特征就是相信实验，故postgresql走起

上一篇文章<mongodb索引--1亿条记录的查询从55.7秒到毫秒级别> 我们做了一个mongo的实验

　　>>插入1亿条记录，约耗时1个小时

　　>>无索引查询一条记录耗时为55.7秒

　　>>有索引查询一条记录耗时小于1秒

1.去官网下载psotgresql :https://www.postgresql.org/

下载最新版本11.1 windows安装，step by step

2.客户端，我选了pgadmin:https://www.pgadmin.org/

  下载最新版本v3.6 windows安装，step by step

3.创建新的数据库www

 4.创建新表

/*             String sql = "CREATE TABLE PERSON " +
                     "(ID INT PRIMARY KEY     NOT NULL," +
                     " NAME           TEXT    NOT NULL, " +
                     " AGE            INT     NOT NULL, " +
                     " ADDRESS        CHAR(50), " +
                     " SALARY         REAL)";
             stmt.executeUpdate(sql);*/

5.插入1亿条记录

java client 依赖包

        <dependency>
            <groupId>org.postgresql</groupId>
            <artifactId>postgresql</artifactId>
            <version>42.2.5</version>
        </dependency>    

java程序

    public void postgresqlOneByOneInsert() {
        try {
            long start=System.currentTimeMillis();
            Class.forName("org.postgresql.Driver");
            Connection connection = DriverManager.getConnection("jdbc:postgresql://127.0.0.1:5432/www", "postgres", "root");
            PreparedStatement   stmt = connection.prepareStatement("INSERT INTO PERSON(ID,NAME,AGE,ADDRESS,SALARY) values(?,?,?,?,?);");
            
            for(int i=0;i<100000000;i++) {
                stmt.setInt(1, i+1);
                stmt.setString(2, "mkyong"+i);
                stmt.setInt(3, i%100);
                stmt.setString(4, "address"+i);
                stmt.setFloat(5, 25000.00f);
                stmt.executeUpdate();
            }

/*             String sql = "CREATE TABLE PERSON " +
                     "(ID INT PRIMARY KEY     NOT NULL," +
                     " NAME           TEXT    NOT NULL, " +
                     " AGE            INT     NOT NULL, " +
                     " ADDRESS        CHAR(50), " +
                     " SALARY         REAL)";
             stmt.executeUpdate(sql);*/
            
            
/*            ResultSet rs = stmt.executeQuery( "SELECT * FROM STUDENT;" );
             while ( rs.next() ) {
                int id = rs.getInt("sid");
                String  name = rs.getString("name");
                System.out.println( "ID = " + id );
                System.out.println( "NAME = " + name );;
                System.out.println();
             }
             rs.close();*/
             stmt.close();
             connection.close();
             System.out.println("耗时:"+(System.currentTimeMillis()-start)+" 毫秒");

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

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

然后是漫长的时间等待插入完成