MySQL 生成千萬測試數據

ps:

一般想找千萬級MySQL測試數據並不容易，所以自己生成，下面這種方法優點簡單，缺點耗時，需要15-20分鐘；

1.pom.xml：只需要io包就夠了；

        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.6</version>
        </dependency>

2.Java代碼段：在這裏我是放在測試類中，當然也可以直接放main方法中；

（下面兩種寫法均行）


@RunWith(SpringRunner.class)
@SpringBootTest
public class MorningDemoApplicationTests {

    @Test
    public void contextLoads() throws IOException {
        try {
            FileWriter w = new FileWriter("D:/1.txt");
            BufferedWriter bw = new BufferedWriter(w);
            for (int i = 1; i <= 10000000; i++) {
                String uuid = UUID.randomUUID().toString();
                bw.write(i + "," + uuid + "\n");
            }
            bw.close();
            w.close();
            System.out.println("執行完畢");
        }
        catch (Exception e) {
            e.printStackTrace();
        }
    }

    @Test
    public void contextLoads2() throws IOException {
        try {
            FileOutputStream outputStream=new FileOutputStream("D:/2.txt");
            for (int i = 1; i <= 10000000; i++) {
                String uuid = UUID.randomUUID().toString();
                StringBuffer stringBuffer=new StringBuffer();
                stringBuffer.append(i).append(",").append(uuid).append("\n");
                outputStream.write(stringBuffer.toString().getBytes());
            }
            System.out.println("執行完畢");
        }
        catch (Exception e) {
            e.printStackTrace();
        }
    }


}