私はファントムリードを作成しようとしていますが、学習のために残念ながら私はできません。私は、Javaスレッド、JDBC、MySQLを使用しています。 ここで私が使用していますプログラムです:ファントムリードを生成できません
package com.isolation.levels.phenomensa;
import javax.xml.transform.Result;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.concurrent.CountDownLatch;
import static com.isolation.levels.ConnectionsProvider.getConnection;
import static com.isolation.levels.Utils.printResultSet;
/**
* Created by dreambig on 13.03.17.
*/
public class PhantomReads {
public static void main(String[] args) {
setUp(getConnection());// delete the newly inserted row, the is supposed to be a phantom row
CountDownLatch countDownLatch1 = new CountDownLatch(1); // use to synchronize threads steps
CountDownLatch countDownLatch2 = new CountDownLatch(1); // use to synchronize threads steps
Transaction1 transaction1 = new Transaction1(countDownLatch1, countDownLatch2, getConnection()); // the first runnable
Transaction2 transaction2 = new Transaction2(countDownLatch1, countDownLatch2, getConnection()); // the second runnable
Thread thread1 = new Thread(transaction1); // transaction 1
Thread thread2 = new Thread(transaction2); // transaction 2
thread1.start();
thread2.start();
}
private static void setUp(Connection connection) {
try {
connection.prepareStatement("DELETE from actor where last_name=\"PHANTOM_READ\"").execute();
} catch (SQLException e) {
e.printStackTrace();
}
}
public static class Transaction1 implements Runnable {
private CountDownLatch countDownLatch;
private CountDownLatch countDownLatch2;
private Connection connection;
public Transaction1(CountDownLatch countDownLatch, CountDownLatch countDownLatch2, Connection connection) {
this.countDownLatch = countDownLatch;
this.countDownLatch2 = countDownLatch2;
this.connection = connection;
}
@Override
public void run() {
try {
String query = "select * from actor where first_name=\"BELA\"";
connection.setAutoCommit(false); // start the transaction
// the transaction isolation, dirty reads and non-repeatable reads are prevented !
// only phantom reads can occure
connection.setTransactionIsolation(Connection.TRANSACTION_REPEATABLE_READ);
//read the query result for the first time.
ResultSet resultSet = connection.prepareStatement(query).executeQuery();
printResultSet(resultSet); // print result.
//count down so that thread2 can insert a row and commit.
countDownLatch2.countDown();
//wait for the second query the finish inserting the row
countDownLatch.await();
System.out.println("\n ********* The query returns a second row satisfies it (a phantom read) ********* !");
//query the result again ...
ResultSet secondRead = connection.createStatement().executeQuery(query);
printResultSet(secondRead); //print the result
} catch (SQLException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
public static class Transaction2 implements Runnable {
private CountDownLatch countDownLatch;
private CountDownLatch countDownLatch2;
private Connection connection;
public Transaction2(CountDownLatch countDownLatch, CountDownLatch countDownLatch2, Connection connection) {
this.countDownLatch = countDownLatch;
this.countDownLatch2 = countDownLatch2;
this.connection = connection;
}
@Override
public void run() {
try {
//wait the first thread to read the result
countDownLatch2.await();
//insert and commit !
connection.prepareStatement("INSERT INTO actor (first_name,last_name) VALUE (\"BELA\",\"PHANTOM_READ\") ").execute();
//count down so that the thread1 can read the result again ...
countDownLatch.countDown();
} catch (SQLException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
は、しかし、これは実際に結果
----------------------------------------------------------
| 196 | | BELA | | WALKEN | | 2006-02-15 04:34:33.0 |
---------------------------------------------------------- The query returns a second row satisfies it (a phantom read)
----------------------------------------------------------
| 196 | | BELA | | WALKEN | | 2006-02-15 04:34:33.0 |
----------------------------------------------------------
あるしかし、私はそれが私が使用しています
----------------------------------------------------------
| 196 | | BELA | | WALKEN | | 2006-02-15 04:34:33.0 |
---------------------------------------------------------- The query returns a second row satisfies it (a phantom read) !
----------------------------------------------------------
| 196 | | BELA | | WALKEN | | 2006-02-15 04:34:33.0 |
----------------------------------------------------------
----------------------------------------------------------
| 196 | | BELA | | PHANTOM_READ | | 2006-02-15 04:34:33.0 |
----------------------------------------------------------
されるべきだと思う: のJava 8 は、 JDBC MySQL InnoDB Sakila DB挿入int O mysqlの