前幾天看了一篇文章<High Performance JSON PostgreSQL vs. MongoDB> 釋出在Percona Live Europe 2017

作者是<Dominic Dwyer Wei Shan Ang>,作者的觀點是PostgreSQL更好，恰巧沒有玩過postgresql，僅僅聽說過。

碼農的第一特徵就是相信實驗，故postgresql走起

上一篇文章<mongodb索引--1億條記錄的查詢從55.7秒到毫秒級別> 我們做了一個mongo的實驗

　　>>插入1億條記錄，約耗時1個小時

　　>>無索引查詢一條記錄耗時為55.7秒

　　>>有索引查詢一條記錄耗時小於1秒

1.去官網下載psotgresql :https://www.postgresql.org/

下載最新版本11.1 windows安裝，step by step

2.客戶端，我選了pgadmin:https://www.pgadmin.org/

  下載最新版本v3.6 windows安裝，step by step

3.建立新的資料庫www

 4.建立新表

/*             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1億條記錄

java client 依賴包

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

java程式

    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("耗時:"+(System.currentTimeMillis()-start)+" 毫秒");

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

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

然後是漫長的時間等待插入完成