Java Hibernate-表或视图不存在错误

我正在尝试使用hibernate在数据库中保存一个对象。当我第一次使用新表名运行代码时，它会抛出下面的错误，但当我第二次运行代码时，它运行得非常好-

    INFO: HHH10001501: Connection obtained from JdbcConnectionAccess [org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator$ConnectionProviderJdbcConnectionAccess@61ce23ac] for (non-JTA) DDL execution was not in auto-commit mode; the Connection 'local transaction' will be committed and the Connection will be set into auto-commit mode.
Sep 01, 2016 3:51:18 AM org.hibernate.tool.schema.internal.ExceptionHandlerLoggedImpl handleException
WARN: GenerationTarget encountered exception accepting command : Error executing DDL via JDBC Statement
org.hibernate.tool.schema.spi.CommandAcceptanceException: Error executing DDL via JDBC Statement
    at org.hibernate.tool.schema.internal.exec.GenerationTargetToDatabase.accept(GenerationTargetToDatabase.java:62)
    at org.hibernate.tool.schema.internal.SchemaDropperImpl.applySqlString(SchemaDropperImpl.java:374)
    at org.hibernate.tool.schema.internal.SchemaDropperImpl.applySqlStrings(SchemaDropperImpl.java:359)
    at org.hibernate.tool.schema.internal.SchemaDropperImpl.dropFromMetadata(SchemaDropperImpl.java:241)
    at org.hibernate.tool.schema.internal.SchemaDropperImpl.performDrop(SchemaDropperImpl.java:154)
    at org.hibernate.tool.schema.internal.SchemaDropperImpl.doDrop(SchemaDropperImpl.java:126)
    at org.hibernate.tool.schema.internal.SchemaDropperImpl.doDrop(SchemaDropperImpl.java:112)
    at org.hibernate.tool.schema.spi.SchemaManagementToolCoordinator.performDatabaseAction(SchemaManagementToolCoordinator.java:137)
    at org.hibernate.tool.schema.spi.SchemaManagementToolCoordinator.process(SchemaManagementToolCoordinator.java:65)
    at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:307)
    at org.hibernate.boot.internal.SessionFactoryBuilderImpl.build(SessionFactoryBuilderImpl.java:490)
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:710)
    at org.sf.main.SessionFactoryBuilder.getSessionFactory(SessionFactoryBuilder.java:26)
    at org.sf.main.SessionFactoryBuilder.main(SessionFactoryBuilder.java:36)
Caused by: java.sql.SQLSyntaxErrorException: ORA-00942: table or view does not exist

    at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:447)
    at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:396)
    at oracle.jdbc.driver.T4C8Oall.processError(T4C8Oall.java:951)
    at oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:513)
    at oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:227)
    at oracle.jdbc.driver.T4C8Oall.doOALL(T4C8Oall.java:531)
    at oracle.jdbc.driver.T4CStatement.doOall8(T4CStatement.java:195)
    at oracle.jdbc.driver.T4CStatement.executeForRows(T4CStatement.java:1036)
    at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1336)
    at oracle.jdbc.driver.OracleStatement.executeInternal(OracleStatement.java:1916)
    at oracle.jdbc.driver.OracleStatement.execute(OracleStatement.java:1878)
    at oracle.jdbc.driver.OracleStatementWrapper.execute(OracleStatementWrapper.java:318)
    at org.hibernate.tool.schema.internal.exec.GenerationTargetToDatabase.accept(GenerationTargetToDatabase.java:49)
    ... 13 more

这是我的实体类-

    import javax.persistence.Column;

    import javax.persistence.Entity;
    import javax.persistence.Id;
    import javax.persistence.Table;

    @Entity
    @Table
    public class Census2010 {
        @Id
        @Column(name="VARIABLE")
        private String variable;

        @Column(name="DATA")
        private long data;

        public String getVariable() {
            return variable;
        }

        public void setVariable(String variable) {
            this.variable = variable;
        }

        public long getData() {
            return data;
        }

        public void setData(long data) {
            this.data = data;
        }
    }

这是NamingStrategy课程-

import org.hibernate.boot.model.naming.Identifier;
import org.hibernate.boot.model.naming.PhysicalNamingStrategyStandardImpl;
import org.hibernate.engine.jdbc.env.spi.JdbcEnvironment;

public class HelloWorldNamingStrategy extends PhysicalNamingStrategyStandardImpl {

    private static final long serialVersionUID = 1L;

    private static final String tableName = "A_12345_P";

    @Override
     public Identifier toPhysicalTableName(Identifier name, JdbcEnvironment context) {
         return new Identifier(tableName, true);
     }
}

感谢您的帮助。

您确信

configuration.setProperty（“hibernate.default_schema”，“somechema”）中的“somechema”是正确的shema吗

如果不正确，则找不到表或视图

另一个选项是使用注释，例如

@Table(schema = "YOURSCHEMA", name = "Census2010")

要了解更多信息，请在hibernate.cfg.xml文件中将hbm2ddl.auto属性设置为true时，要求hibernate框架创建与要保存的对象对应的所有表，然后保存这些对象

但是，在创建表之前，hibernate首先尝试删除数据库中存在的表

因此，当您第一次运行应用程序时，由于数据库中不存在表，因此您将面临错误。下次运行程序时，您将不会看到上述错误，因为表存在，hibernate将能够成功删除它们。
schema是正确的。当我第一次使用新表名运行时，问题就出现了。第二次使用相同的表名时，它运行良好。@rufy甚至我都面临同样的问题。在哪里可以找到此问题的解决方案？如果使用@Table（schema=“YOURSCHEMA”，name=“Census2010”），则会出现相同的错误？您的“show_sql”属性设置为“true”，错误与“通过JDBC语句执行DDL时出错”有关。您能从日志中提供生成的DDL吗？实体表的DDL语句应出现在异常之前。
@Table(schema = "YOURSCHEMA", name = "Census2010")