Question

我有以下脚本来创建表autolife.log：

CREATE TABLE `log` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `idpoint` int(11) NOT NULL,
  `value` varchar(10) NOT NULL,
  `time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  KEY `fk_point_id` (`idpoint`),
  CONSTRAINT `fk_point_id` FOREIGN KEY (`idpoint`) REFERENCES `point` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION
) ENGINE=InnoDB AUTO_INCREMENT=155562 DEFAULT CHARSET=latin2$$

所以我使用JPA Tools从Eclipse Indigo中的表创建实体：

@Entity
public class Log implements Serializable {
    private static final long serialVersionUID = 1L;

    @Id
    @SequenceGenerator(name="LOG_ID_GENERATOR", sequenceName="SEQUENCE_KEY")
    @GeneratedValue(strategy=GenerationType.SEQUENCE, generator="LOG_ID_GENERATOR")
    private Integer id;

    private Timestamp time;

    private String value;

    //bi-directional many-to-one association to Point
    @ManyToOne
    @JoinColumn(name="idpoint")
    private Point point;

    public Log() {
    }

    // get's and set's

当我在我的localhost计算机上运行时，工作正常，但是当我导出.war并投入生产时，给我这个错误（下面你可以看到代码生成的异常）：

ubuntu@domU-12-31-39-0A-12-7B:~/glassfish/glassfish3/glassfish/domains/domain1/logs$ vi server.log
        at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeCall(DatasourceCallQueryMechanism.java:193)
        at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeSelectCall(DatasourceCallQueryMechanism.java:264)
        at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.selectAllRows(DatasourceCallQueryMechanism.java:646)
        at org.eclipse.persistence.internal.queries.ExpressionQueryMechanism.selectAllRowsFromTable(ExpressionQueryMechanism.java:2611)
        at org.eclipse.persistence.internal.queries.ExpressionQueryMechanism.selectAllRows(ExpressionQueryMechanism.java:2570)
        at org.eclipse.persistence.queries.ReadAllQuery.executeObjectLevelReadQuery(ReadAllQuery.java:420)
        at org.eclipse.persistence.queries.ObjectLevelReadQuery.executeDatabaseQuery(ObjectLevelReadQuery.java:1081)
        at org.eclipse.persistence.queries.DatabaseQuery.execute(DatabaseQuery.java:844)
        at org.eclipse.persistence.queries.ObjectLevelReadQuery.execute(ObjectLevelReadQuery.java:1040)
        at org.eclipse.persistence.queries.ReadAllQuery.execute(ReadAllQuery.java:392)
        at org.eclipse.persistence.queries.ObjectLevelReadQuery.executeInUnitOfWork(ObjectLevelReadQuery.java:1128)
        at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.internalExecuteQuery(UnitOfWorkImpl.java:2871)
        at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1516)
        at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1498)
        at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1463)
        at org.eclipse.persistence.internal.jpa.EJBQueryImpl.executeReadQuery(EJBQueryImpl.java:485)
        at org.eclipse.persistence.internal.jpa.EJBQueryImpl.getResultList(EJBQueryImpl.java:742)
        at com.brainset.eao.LogEAO.list(LogEAO.java:54)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.glassfish.ejb.security.application.EJBSecurityManager.runMethod(EJBSecurityManager.java:1052)
        at org.glassfish.ejb.security.application.EJBSecurityManager.invoke(EJBSecurityManager.java:1124)
        at com.sun.ejb.containers.BaseContainer.invokeBeanMethod(BaseContainer.java:5388)
        at com.sun.ejb.EjbInvocation.invokeBeanMethod(EjbInvocation.java:619)
        at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:800)
        at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:571)
        at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.doAround(SystemInterceptorProxy.java:162)
        at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.aroundInvoke(SystemInterceptorProxy.java:144)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:861)
        at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:800)
        at com.sun.ejb.containers.interceptors.InterceptorManager.intercept(InterceptorManager.java:370)
        at com.sun.ejb.containers.BaseContainer.__intercept(BaseContainer.java:5360)
        at com.sun.ejb.containers.BaseContainer.intercept(BaseContainer.java:5348)
        at com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:214)
        ... 44 more
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Table 'autolife.LOG' doesn't exist
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
        at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
        at com.mysql.jdbc.Util.getInstance(Util.java:386)
        at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1052)
        at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4098)
        at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4030)
        at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2490)
        at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2651)
        at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2677)
        at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2134)
        at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:2300)
        at com.sun.gjc.spi.jdbc40.PreparedStatementWrapper40.executeQuery(PreparedStatementWrapper40.java:642)
        at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.executeSelect(DatabaseAccessor.java:931)
        at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.basicExecuteCall(DatabaseAccessor.java:607)
        ... 88 more
|#]

正如您所看到的那样，该表不存在，但存在我从我的localhost数据库导出并导入到生产主机。但仍然给出了这个错误：

Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Table 'autolife.LOG' doesn't exist

我该怎么办？

Answer 1

MySQL表名depends on operating system的区分大小写，我猜这是原因：

在MySQL中，数据库对应于数据目录中的目录。数据库中的每个表对应于数据库目录中的至少一个文件（并且可能更多，取决于存储引擎）。因此，底层操作系统的区分大小写在数据库和表名称的区分大小写中起作用。这意味着数据库和表名在Windows中不区分大小写，并且在大多数Unix中区分大小写。一个值得注意的例外是Mac OS X，它基于Unix，但使用不区分大小写的默认文件系统类型（HFS +）。但是，Mac OS X还支持UFS卷，它们在任何Unix上都是区分大小写的。

因此，您需要明确地在正确的情况下设置表名：

@Entity @Table(name = "log")
public class Log implements Serializable { ... }

Answer 2

很酷的问题。

怎么样？

USE <Database Name>
GO

执行脚本之前的

子句？

通常所有SP表都在执行前有2行

JPA：MySQL说表不存在，但它确实存在

2 个答案: