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java - Hibernate 中的操作超时

转载 作者：太空宇宙 更新时间：2023-11-04 14:30:49 25 4
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学习 hibernate ..请放轻松:)

这是我用来根据用户选择执行操作的主类:

package hibernate_tut_emp;

import java.util.Iterator;
import java.util.List;
import java.util.Scanner;

import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;

public class MyOps {

    public static void main(String[] args) {

        Scanner scnr = new Scanner(System.in);
        System.out.print(" 1 Insert \n 2 Delete \n 3 Update \n 4 Select \n Enter a choice : ");
        int choice = scnr.nextInt();

        SessionFactory sesfact = HibernateUtil.getSessionFactory();
        Session session = sesfact.openSession();
        session.beginTransaction();

        Employee emp = new Employee();


        switch (choice) {
        case 1: //insert
            System.out.print("Enter a name : ");
            String name = scnr.next();
            System.out.print("Enter a surname : ");
            String surname = scnr.next();


            emp.setName(name);
            emp.setSurname(surname);

            session.save(emp);
            session.getTransaction().commit();

            break;
        case 2://delete
            System.out.print("Enter a name to delete : ");

            String delname = scnr.next();
            Query delQuery = session.getNamedQuery("DeleteByName");
            delQuery.setParameter("name", delname);
            delQuery.executeUpdate();
            session.getTransaction().commit();

            break;
        case 3: //update
            System.out.print("Enter a name to update : ");
            String upname = scnr.next();
            System.out.print("Enter a surname to update : ");
            String surn_name = scnr.next();


            Query q = session.getNamedQuery("UpdateSurnameOfName");
            q.setParameter("name", upname);
            q.setParameter("surname", surn_name);
            q.executeUpdate();
            session.getTransaction().commit();

            break;
        case 4:
            System.out.print("Enter a name to show details : ");
            String sh_name = scnr.next();

            session = sesfact.getCurrentSession();
            session.beginTransaction();

            Query s_q = session.getNamedQuery("GetDetailsByName");
            s_q.setParameter("name", sh_name);

            List list = s_q.list();
            Iterator it = list.iterator();

            while(it.hasNext()){
                Employee employee = (Employee)it.next();
                System.out.println(employee.getId()+" "+employee.getName()+" "+employee.getSurname());
            }

            break;
        default:
            System.out.println("wrong choice maadi....");
            break;
        }



    }

}

HibernateUtil.java

package hibernate_tut_emp;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;

public class HibernateUtil {

    private static final SessionFactory sessionFactory;

    private static ServiceRegistry serviceRegistry;

    static {

        try {

            Configuration configuration = new Configuration();
            configuration.configure();
            serviceRegistry = new StandardServiceRegistryBuilder()
                    .applySettings(configuration.getProperties()).build();
            sessionFactory = configuration.buildSessionFactory(serviceRegistry);

        } catch (Throwable th) {

            System.err.println("Initial SessionFactory creation failed" + th);
            throw new ExceptionInInitializerError(th);

        }

    }

    public static SessionFactory getSessionFactory() {

        return sessionFactory;

    }
}

问题

到目前为止，我单独执行了所有查询，它们都按预期工作，但在我将它们全部放入 switch 中之后我得到Exception in thread "main" org.hibernate.exception.LockTimeoutException: could not execute statement错误。我认为这与连接池有关。
有人可以准确地告诉我它在这里是如何工作的以及操作完成后释放连接的方法(如果是建议的方式)吗？

控制台:

 1 Insert 
 2 Delete 
 3 Update 
 4 Select 
 Enter a choice : 1
Oct 03, 2014 11:50:27 AM org.hibernate.annotations.common.reflection.java.JavaReflectionManager <clinit>
INFO: HCANN000001: Hibernate Commons Annotations {4.0.5.Final}
Oct 03, 2014 11:50:27 AM org.hibernate.Version logVersion
INFO: HHH000412: Hibernate Core {4.3.6.Final}
Oct 03, 2014 11:50:27 AM org.hibernate.cfg.Environment <clinit>
INFO: HHH000206: hibernate.properties not found
Oct 03, 2014 11:50:27 AM org.hibernate.cfg.Environment buildBytecodeProvider
INFO: HHH000021: Bytecode provider name : javassist
Oct 03, 2014 11:50:27 AM org.hibernate.cfg.Configuration configure
INFO: HHH000043: Configuring from resource: /hibernate.cfg.xml
Oct 03, 2014 11:50:27 AM org.hibernate.cfg.Configuration getConfigurationInputStream
INFO: HHH000040: Configuration resource: /hibernate.cfg.xml
Oct 03, 2014 11:50:27 AM org.hibernate.internal.util.xml.DTDEntityResolver resolveEntity
WARN: HHH000223: Recognized obsolete hibernate namespace http://hibernate.sourceforge.net/. Use namespace http://www.hibernate.org/dtd/ instead. Refer to Hibernate 3.6 Migration Guide!
Oct 03, 2014 11:50:27 AM org.hibernate.cfg.Configuration doConfigure
INFO: HHH000041: Configured SessionFactory: null
Oct 03, 2014 11:50:27 AM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
WARN: HHH000402: Using Hibernate built-in connection pool (not for production use!)
Oct 03, 2014 11:50:27 AM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
INFO: HHH000401: using driver [com.mysql.jdbc.Driver] at URL [jdbc:mysql://localhost:3306/hibernate]
Oct 03, 2014 11:50:27 AM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
INFO: HHH000046: Connection properties: {user=root, password=****}
Oct 03, 2014 11:50:27 AM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
INFO: HHH000006: Autocommit mode: false
Oct 03, 2014 11:50:27 AM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
INFO: HHH000115: Hibernate connection pool size: 1 (min=1)
Oct 03, 2014 11:50:28 AM org.hibernate.dialect.Dialect <init>
INFO: HHH000400: Using dialect: org.hibernate.dialect.MySQLDialect
Oct 03, 2014 11:50:28 AM org.hibernate.engine.transaction.internal.TransactionFactoryInitiator initiateService
INFO: HHH000399: Using default transaction strategy (direct JDBC transactions)
Oct 03, 2014 11:50:28 AM org.hibernate.hql.internal.ast.ASTQueryTranslatorFactory <init>
INFO: HHH000397: Using ASTQueryTranslatorFactory
Oct 03, 2014 11:50:28 AM org.hibernate.tool.hbm2ddl.SchemaUpdate execute
INFO: HHH000228: Running hbm2ddl schema update
Oct 03, 2014 11:50:28 AM org.hibernate.tool.hbm2ddl.SchemaUpdate execute
INFO: HHH000102: Fetching database metadata
Oct 03, 2014 11:50:28 AM org.hibernate.tool.hbm2ddl.SchemaUpdate execute
INFO: HHH000396: Updating schema
Oct 03, 2014 11:50:28 AM org.hibernate.tool.hbm2ddl.TableMetadata <init>
INFO: HHH000261: Table found: hibernate.hib1
Oct 03, 2014 11:50:28 AM org.hibernate.tool.hbm2ddl.TableMetadata <init>
INFO: HHH000037: Columns: [id, name, surname]
Oct 03, 2014 11:50:28 AM org.hibernate.tool.hbm2ddl.TableMetadata <init>
INFO: HHH000108: Foreign keys: []
Oct 03, 2014 11:50:28 AM org.hibernate.tool.hbm2ddl.TableMetadata <init>
INFO: HHH000126: Indexes: [primary]
Oct 03, 2014 11:50:28 AM org.hibernate.tool.hbm2ddl.SchemaUpdate execute
INFO: HHH000232: Schema update complete
Enter a name : mohd.
Enter a surname : salim
Hibernate: insert into hib1 (name, surname, id) values (?, ?, ?)
Oct 03, 2014 11:51:27 AM org.hibernate.engine.jdbc.spi.SqlExceptionHelper logExceptions
WARN: SQL Error: 1205, SQLState: 41000
Oct 03, 2014 11:51:27 AM org.hibernate.engine.jdbc.spi.SqlExceptionHelper logExceptions
ERROR: Lock wait timeout exceeded; try restarting transaction
Oct 03, 2014 11:51:27 AM org.hibernate.engine.jdbc.batch.internal.AbstractBatchImpl release
INFO: HHH000010: On release of batch it still contained JDBC statements
Exception in thread "main" org.hibernate.exception.LockTimeoutException: could not execute statement
    at org.hibernate.dialect.MySQLDialect$1.convert(MySQLDialect.java:447)
    at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:49)
    at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:126)
    at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:112)
    at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:211)
    at org.hibernate.engine.jdbc.batch.internal.NonBatchingBatch.addToBatch(NonBatchingBatch.java:62)
    at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3124)
    at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3581)
    at org.hibernate.action.internal.EntityInsertAction.execute(EntityInsertAction.java:104)
    at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:463)
    at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:349)
    at org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:350)
    at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:56)
    at org.hibernate.internal.SessionImpl.flush(SessionImpl.java:1222)
    at org.hibernate.internal.SessionImpl.managedFlush(SessionImpl.java:425)
    at org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.beforeTransactionCommit(JdbcTransaction.java:101)
    at org.hibernate.engine.transaction.spi.AbstractTransactionImpl.commit(AbstractTransactionImpl.java:177)
    at hibernate_tut_emp.MyOps.main(MyOps.java:38)
Caused by: java.sql.SQLException: Lock wait timeout exceeded; try restarting transaction
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:996)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3887)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3823)
    at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2435)
    at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2582)
    at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2530)
    at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1907)
    at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2141)
    at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2077)
    at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2062)
    at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:208)
    ... 13 more

最佳答案

正如 @JBNizet 在评论中所指出的......

在尝试通过 hibernate 对其进行操作时，我也在 ubuntu 终端中打开了该表。这阻止了在表上完成操作。我已关闭它，现在它工作正常。

为了访问该表，我现在使用其他架构中的database.tableName方法来访问它，从而避免了死锁!

关于java - Hibernate 中的操作超时，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/26174241/

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