java.sql.SQLSyntaxErrorException:表“”mydb.alien“”不存在

Question

Alien.java(Pojo类)，这是我的pojo类

  package com.me.Hive1;
  import javax.persistence.Entity;
  import javax.persistence.Id;

  @Entity
  public class Alien {          
        @Id
        private int id;
        private String name;
        public int getId()
        {
            return id;
        }
        public void setId(int id)
        {
            this.id = id;
        }
        public String getName()
        {
             return name;
        }
        public void setName(String name)
        {
             this.name = name;
        }
     }

App.java(主类)，这是主类。

package com.me.Hive1;
            import org.hibernate.Session;
            import org.hibernate.SessionFactory;
            import org.hibernate.Transaction;
            import org.hibernate.cfg.Configuration;
            //MAIN CLASS
            /**
             * Hello world!
             *
             */
            public class App 
            {
                public static void main( String[] args )
                {
                    System.out.println( "Hello World!" );
                    Alien a = new Alien();
                    a.setId(101);
                    a.setName("bhanu");
                    try{
                    Configuration fact = new Configuration().configure().addAnnotatedClass(Alien.class);
                    SessionFactory sf = fact.buildSessionFactory();
                    Session session = sf.openSession();
                    Transaction t = session.beginTransaction();
                    session.save(a);
                    t.commit();
                    }
                    catch(Exception e)
                    {
                        e.printStackTrace();
                    }

                }
            }

配置文件(hibernate.cfg.xml)，这是我的hibernate配置文件。

<?xml version="1.0" encoding="UTF-8"?><!--Configuration file-->
        <!DOCTYPE hibernate-configuration PUBLIC
                "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
                "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
        <hibernate-configuration>
            <session-factory>
                <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
                <property name="hibernate.connection.password">root</property>
                <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/mydb</property>
                <property name="hibernate.connection.username">root</property>
                <property name="hibernate.hbm2dll.auto">create</property>
                <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
                <mapping class="com.me.Hive1.Alien" resource="Alien.hbm.xml"/>
            </session-factory>
        </hibernate-configuration>

Alien.hbm.xml(映射文件)，这是映射文件，是否可选？

<?xml version="1.0"?>
    <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
    <!-- Generated Jul 5, 2017 1:44:20 AM by Hibernate Tools 3.5.0.Final -->
    <hibernate-mapping>
        <class name="com.me.Hive1.Alien" table="alien">
            <id name="id" type="int">
                <column name="ID" />
                <generator class="assigned" />
            </id>
            <property name="name" type="java.lang.String">
                <column name="NAME" />
            </property>
        </class>
    </hibernate-mapping>

我得到异常(控制台输出)这是我得到的异常，不知道我被打击了

    Hello World!
    Jul 05, 2017 4:13:18 PM org.hibernate.Version logVersion
    INFO: HHH000412: Hibernate Core {5.2.10.Final}
    Jul 05, 2017 4:13:18 PM org.hibernate.cfg.Environment <clinit>
    INFO: HHH000206: hibernate.properties not found
    Jul 05, 2017 4:13:19 PM org.hibernate.annotations.common.reflection.java.JavaReflectionManager <clinit>
    INFO: HCANN000001: Hibernate Commons Annotations {5.0.1.Final}
    Jul 05, 2017 4:13:19 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
    WARN: HHH10001002: Using Hibernate built-in connection pool (not for production use!)
    Loading class `com.mysql.jdbc.Driver'. This is deprecated. The new driver class is `com.mysql.cj.jdbc.Driver'. The driver is automatically registered via the SPI and manual loading of the driver class is generally unnecessary.
    Jul 05, 2017 4:13:19 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
    INFO: HHH10001005: using driver [com.mysql.jdbc.Driver] at URL [jdbc:mysql://localhost:3306/mydb]
    Jul 05, 2017 4:13:19 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
    INFO: HHH10001001: Connection properties: {user=root, password=****}
    Jul 05, 2017 4:13:19 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
    INFO: HHH10001003: Autocommit mode: false
    Jul 05, 2017 4:13:19 PM org.hibernate.engine.jdbc.connections.internal.PooledConnections <init>
    INFO: HHH000115: Hibernate connection pool size: 20 (min=1)
    Wed Jul 05 16:13:19 IST 2017 WARN: Establishing SSL connection without server's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn't set. For compliance with existing applications not using SSL the verifyServerCertificate property is set to 'false'. You need either to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for server certificate verification.
    Jul 05, 2017 4:13:19 PM org.hibernate.dialect.Dialect <init>
    INFO: HHH000400: Using dialect: org.hibernate.dialect.MySQLDialect
    Jul 05, 2017 4:13:24 PM org.hibernate.engine.jdbc.spi.SqlExceptionHelper logExceptions
    WARN: SQL Error: 1146, SQLState: 42S02
    Jul 05, 2017 4:13:24 PM org.hibernate.engine.jdbc.spi.SqlExceptionHelper logExceptions
    ERROR: Table 'mydb.alien' doesn't exist
    Jul 05, 2017 4:13:24 PM org.hibernate.engine.jdbc.batch.internal.AbstractBatchImpl release
    INFO: HHH000010: On release of batch it still contained JDBC statements
    Jul 05, 2017 4:13:24 PM org.hibernate.internal.ExceptionMapperStandardImpl mapManagedFlushFailure
    ERROR: HHH000346: Error during managed flush [org.hibernate.exception.SQLGrammarException: could not execute statement]
    javax.persistence.PersistenceException: org.hibernate.exception.SQLGrammarException: could not execute statement
        at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:147)
        at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:155)
        at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:162)
        at org.hibernate.internal.SessionImpl.doFlush(SessionImpl.java:1441)
        at org.hibernate.internal.SessionImpl.managedFlush(SessionImpl.java:491)
        at org.hibernate.internal.SessionImpl.flushBeforeTransactionCompletion(SessionImpl.java:3201)
        at org.hibernate.internal.SessionImpl.beforeTransactionCompletion(SessionImpl.java:2411)
        at org.hibernate.engine.jdbc.internal.JdbcCoordinatorImpl.beforeTransactionCompletion(JdbcCoordinatorImpl.java:467)
        at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl.beforeCompletionCallback(JdbcResourceLocalTransactionCoordinatorImpl.java:146)
        at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl.access$100(JdbcResourceLocalTransactionCoordinatorImpl.java:38)
        at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl$TransactionDriverControlImpl.commit(JdbcResourceLocalTransactionCoordinatorImpl.java:220)
        at org.hibernate.engine.transaction.internal.TransactionImpl.commit(TransactionImpl.java:68)
        at com.me.Hive1.App.main(App.java:25)
    Caused by: org.hibernate.exception.SQLGrammarException: could not execute statement
        at org.hibernate.exception.internal.SQLExceptionTypeDelegate.convert(SQLExceptionTypeDelegate.java:63)
        at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:42)
        at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:111)
        at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:97)
        at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:208)
        at org.hibernate.engine.jdbc.batch.internal.NonBatchingBatch.addToBatch(NonBatchingBatch.java:45)
        at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3003)
        at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3503)
        at org.hibernate.action.internal.EntityInsertAction.execute(EntityInsertAction.java:89)
        at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:589)
        at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:463)
        at org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:337)
        at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:39)
        at org.hibernate.internal.SessionImpl.doFlush(SessionImpl.java:1435)
        ... 9 more
    Caused by: java.sql.SQLSyntaxErrorException: Table 'mydb.alien' doesn't exist
        at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:536)
        at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:513)
        at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:115)
        at com.mysql.cj.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:1983)
        at com.mysql.cj.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1826)
        at com.mysql.cj.jdbc.PreparedStatement.executeUpdateInternal(PreparedStatement.java:2034)
        at com.mysql.cj.jdbc.PreparedStatement.executeUpdateInternal(PreparedStatement.java:1970)
        at com.mysql.cj.jdbc.PreparedStatement.executeLargeUpdate(PreparedStatement.java:5001)
        at com.mysql.cj.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1955)
        at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:205)
        ... 18 more

Answer 1

试试这个-

在配置文件中更改此属性的值：

<property name="hibernate.hbm2ddl.auto" value="update" />

希望本文能对您有所帮助;)