求助，为什么表建不起来
<?xml version="1.0" encoding="utf-8"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence
http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd"
version="1.0">
<persistence-unit name="msg" transaction-type="RESOURCE_LOCAL">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<properties>
<property name="hibernate.dialect" value="org.hibernate.dialect.OracleDialect"/>
<!-- 建表方式，value值为creat-drop时表示创建应用的时候建表，结束应用的时候表自动删除；
值为update表示如果映射元数据不存在则建立表，如果映射元数据存在并新增加了字段则会添加到数据库表中 -->
<property name="hibernate.hbm2ddl.auto" value="update"/>
<property name="hibernate.show_sql" value="true"/>
<property name="hibernate.connection.driver_class" value="oracle.jdbc.OracleDriver"/>
<property name="hibernate.connection.username" value="....没错...."/>
<property name="hibernate.connection.password" value=".......没错...."/>
<property name="hibernate.connection.url" value="jdbc:oracle:thin:@localhost:1521:orcl"/>
</properties>
</persistence-unit>
</persistence>
package com.demo.entity;
import java.io.Serializable;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.SequenceGenerator;
import javax.persistence.Table;
@Entity
@Table(name = "User")
public class User implements Serializable {
/**
*
*/
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.SEQUENCE)
@SequenceGenerator(name = "ID_sqe")
private int id;
@Column(name = "User_name", length = 20, nullable = true)
private String username;
@Column(name = "User_pwd", length = 40, nullable = true)
private String password;
@Column(name = "User_lev", length = 1, nullable = true)
private int level=0;//0为普通用户，1管理员
public User() {}
public User(int id, String name, String password) {
this.id = id;
this.username = name;
this.password = password;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public int getLevel() {
return level;
}
public void setLevel(int level) {
this.level = level;
}
@Override
public String toString() {
return "User [id=" + id + ", username=" + username + ", password=" + password
+ ", level=" + level + "]";
}
}
2013-11-19 10:27:08 org.apache.catalina.core.AprLifecycleListener init
信息: Loaded APR based Apache Tomcat Native library 1.1.27 using APR version 1.4.6.
2013-11-19 10:27:08 org.apache.catalina.core.AprLifecycleListener init
信息: APR capabilities: IPv6 [true], sendfile [true], accept filters [false], random [true].
2013-11-19 10:27:09 org.apache.catalina.core.AprLifecycleListener initializeSSL
信息: OpenSSL successfully initialized (OpenSSL 1.0.1d 5 Feb 2013)
2013-11-19 10:27:09 org.apache.coyote.AbstractProtocol init
信息: Initializing ProtocolHandler ["http-apr-8080"]
2013-11-19 10:27:09 org.apache.coyote.AbstractProtocol init
信息: Initializing ProtocolHandler ["ajp-apr-8009"]
2013-11-19 10:27:09 org.apache.catalina.startup.Catalina load
信息: Initialization processed in 957 ms
2013-11-19 10:27:09 org.apache.catalina.core.StandardService startInternal
信息: Starting service Catalina
2013-11-19 10:27:09 org.apache.catalina.core.StandardEngine startInternal
信息: Starting Servlet Engine: Apache Tomcat/7.0.37
2013-11-19 10:27:09 org.apache.catalina.startup.HostConfig deployDirectory
信息: Deploying web application directory E:\Studysoftware\tomcat\webapps\ajax
2013-11-19 10:27:09 org.apache.catalina.startup.HostConfig deployDirectory
信息: Deploying web application directory E:\Studysoftware\tomcat\webapps\Demo
2013-11-19 10:27:10 org.apache.catalina.startup.HostConfig deployDirectory
信息: Deploying web application directory E:\Studysoftware\tomcat\webapps\host-manager
2013-11-19 10:27:10 org.apache.catalina.startup.HostConfig deployDirectory
信息: Deploying web application directory E:\Studysoftware\tomcat\webapps\manager
2013-11-19 10:27:10 org.apache.catalina.startup.HostConfig deployDirectory
信息: Deploying web application directory E:\Studysoftware\tomcat\webapps\NewDemo
2013-11-19 10:27:12 org.apache.catalina.core.ApplicationContext log
信息: No Spring WebApplicationInitializer types detected on classpath
2013-11-19 10:27:13 org.apache.catalina.core.ApplicationContext log
信息: Initializing Spring root WebApplicationContext
log4j:WARN No appenders could be found for logger (org.springframework.web.context.ContextLoader).
log4j:WARN Please initialize the log4j system properly.
2013-11-19 10:27:15 org.apache.catalina.core.ApplicationContext log
信息: Initializing Spring FrameworkServlet 'SpringMVC'
2013-11-19 10:27:16 org.apache.catalina.startup.HostConfig deployDirectory
信息: Deploying web application directory E:\Studysoftware\tomcat\webapps\ROOT
2013-11-19 10:27:16 org.apache.coyote.AbstractProtocol start
信息: Starting ProtocolHandler ["http-apr-8080"]
2013-11-19 10:27:16 org.apache.coyote.AbstractProtocol start
信息: Starting ProtocolHandler ["ajp-apr-8009"]
2013-11-19 10:27:16 org.apache.catalina.startup.Catalina start
信息: Server startup in 6829 ms
<session-factory>
<!-- 配置数据库连接信息 -->
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/hibernate</property>
<property name="connection.username">root</property>
<property name="connection.password">root</property>
<!-- 设置使用sql语句的方言 -->
<property name="hibernate.hbm2ddl.auto">update</property>
<!-- 需不需要将生成的SQL语句打印出来 -->
<property name="show_sql">true</property>
<!-- 配置 -->
<mapping resource="com/hibernate/model/Student.hbm.xml" /><!-- 指定映射文件 -->
</session-factory>
</hibernate-configuration>
