学习hibernate ..请轻松一下：）
这是我用来根据用户选择执行操作的主要类：
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
直到现在我单独执行所有查询并且它们都按预期工作但在我将所有查询放在switch内后我收到Exception in thread "main" org.hibernate.exception.LockTimeoutException: could not execute statement错误。我认为这与连接池有关。
有人可以告诉我它在这里工作的确切方式以及在操作完成后释放连接（，如果它是建议的方式）的方法吗？
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
答案 0 :(得分：0)
@JBNizet在评论中指出......
我在ubuntu终端上打开了表，同时试图通过hibernate对它进行操作。这阻止了在桌面上进行操作。我已经关闭它并且它现在正常工作。
要访问该表，我正在使用其他模式的database.tableName方法来访问它，从而避免死锁！