Question

实际上我已经创建了用于在mysql数据库中创建表的Entity Beans，使用entityfactory的事务类一切正常。

现在我需要这个功能......当我在应用程序服务器JBOSS中部署EAR文件时，必须检查表中是否存在表...如果它们不存在......必须创建表格自动..当然我已经在persistence.xml中指定了这个函数hibernate.hbm2ddl.auto = update。但仍然没有创建数据库中不存在的任何表，并且在运行应用程序时也没有抛出任何错误服务器它只创建mysql默认表..但不是开发的那些，在这里我给我的代码：

package com.ernst.persistenceImpl.beanImpl;

import com.ernst.persistenceAPI.beanAPI.NrKreiseBeanAPI;
import com.ernst.persistenceAPI.localBeanAPI.NrKreiseLocalBeanAPI;
import com.ernst.persistenceAPI.remoteBeanAPI.NrKreiseRemoteBeanAPI;

import javax.persistence.Entity;
import javax.persistence.Table;
import javax.persistence.Id;
import javax.persistence.Basic;
import java.io.Serializable;

@Entity
@Table(name = "NR_KREISE")
public class NrKreiseBean implements NrKreiseBeanAPI, NrKreiseLocalBeanAPI,
NrKreiseRemoteBeanAPI, Serializable {

    @Id
    private int nr_kreise_id;

    @Basic
    private int fk_nr_typ;

    @Basic
    private int data_ref_von;

    @Basic
    private int data_ref_bis;

    @Basic
    private int data_ref;

    @Basic
    private int msg_ref_von;

    @Basic
    private int msg_ref_bis;

    @Basic
    private int msg_ref;

    @Basic
    private String desc;

    public int getNr_kreise_id() {
        return nr_kreise_id;
    }

    public void setNr_kreise_id(int nr_kreise_id) {
        this.nr_kreise_id = nr_kreise_id;
    }

    public int getFk_nr_typ() {
        return fk_nr_typ;
    }

    public void setFk_nr_typ(int fk_nr_typ) {
        this.fk_nr_typ = fk_nr_typ;
    }

    public int getData_ref_von() {
        return data_ref_von;
    }

    public void setData_ref_von(int data_ref_von) {
        this.data_ref_von = data_ref_von;
    }

    public int getData_ref_bis() {
        return data_ref_bis;
    }

    public void setData_ref_bis(int data_ref_bis) {
        this.data_ref_bis = data_ref_bis;
    }

    public int getData_ref() {
        return data_ref;
    }

    public void setData_ref(int data_ref) {
        this.data_ref = data_ref;
    }

    public int getMsg_ref_von() {
        return msg_ref_von;
    }

    public void setMsg_ref_von(int msg_ref_von) {
        this.msg_ref_von = msg_ref_von;
    }

    public int getMsg_ref_bis() {
        return msg_ref_bis;
    }

    public void setMsg_ref_bis(int msg_ref_bis) {
        this.msg_ref_bis = msg_ref_bis;
    }

    public int getMsg_ref() {
        return msg_ref;
    }

    public void setMsg_ref(int msg_ref) {
        this.msg_ref = msg_ref;
    }

    public String getDesc() {
        return desc;
    }

    public void setDesc(String desc) {
        this.desc = desc;
    }
}

Persistence.xml文件：

<?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="DefaultDS" transaction-type="JTA">
        <jta-data-source>java:/DefaultDS</jta-data-source>
        <class>com.ernst.persistenceImpl.beanImpl.NrKreiseBean</class>
        <properties>
            <property name="jboss.entity.manager.factory.jndi.name"
                value="persistence-units/DefaultDS" />
            <property name="hibernate.ejb.cfgfile"
                      value="WEB-INF.classes.META-INF.hibernate.cfg.xml" />
            <property name="hibernate.dialect"
                      value="org.hibernate.dialect.MySQLDialect" />
            <property name="hibernate.connection.driver_class"
                      value="com.mysql.jdbc.Driver" />
            <property name="hibernate.connection.url"
                      value="jdbc:mysql://localhost:3306/lagerstandnew" />
            <property name="hibernate.connection.username" value="root" />
            <property name="hibernate.connection.password" value="sekhar" />

            <!-- Scan for annotated classes and Hibernate mapping XML files -->
            <property name="hibernate.archive.autodetection"
                      value="class, hbm" />
            <property name="hibernate.hbm2ddl.auto"
                      value="create" />
            <!-- SQL stdout logging -->
            <property name="hibernate.format_sql" value="true" />
            <property name="hibernate.show_sql" value="true" />
            <property name="use_sql_comments" value="true" />
        </properties>
    </persistence-unit>
</persistence>

任何人都可以告诉我如何做到这一点，或者请告诉我，如果我在上述文件中做错了什么。

先谢谢。

最诚挚的问候，拉加。

Answer 1

也许您的表实际上是在DefaultDS指向的数据库中创建的？在标准的JBoss环境中，这是一个HypersonicSQL数据库。我将从您的配置中删除所有DefaultDS引用。

Answer 2

（...）当我运行应用程序服务器时，它只创建mysql默认表而不是开发的默认表

除非您覆盖hsqldb-ds.xml文件，否则您无法连接到您认为自己的数据库。

在JBoss上部署应用程序时，持久性提供程序正在使用JTA数据源，该数据源的全局JNDI名称由以下元素指定：

<jta-data-source>java:/DefaultDS</jta-data-source>

而不是使用特定于hibernate properties配置的内置连接池。

如果要连接到MySQL数据库，

创建指向它的数据源
在persistence.xml中使用此数据源。

对于步骤＃1，请参阅Chapter 8. Using other Databases（它们提供基于MySQL的示例）。

对于步骤＃2，典型的persistence.xml将是（假设MySQL数据源为MySqlDS）：

<?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="DefaultDS" transaction-type="JTA">
        <jta-data-source>java:/MySqlDS</jta-data-source>
        <class>com.ernst.persistenceImpl.beanImpl.NrKreiseBean</class>
        <properties>
            <property name="hibernate.ejb.cfgfile"
                      value="WEB-INF.classes.META-INF.hibernate.cfg.xml" />

            <!-- Scan for annotated classes and Hibernate mapping XML files -->
            <property name="hibernate.archive.autodetection"
                      value="class, hbm" />
            <property name="hibernate.hbm2ddl.auto"
                      value="create" />
            <!-- SQL stdout logging -->
            <property name="hibernate.format_sql" value="true" />
            <property name="hibernate.show_sql" value="true" />
            <property name="use_sql_comments" value="true" />
        </properties>
    </persistence-unit>
</persistence>

Answer 3

以下persistence.xml完美运行

 <?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="lagerstand_local" transaction-type="RESOURCE_LOCAL">
    <provider>org.hibernate.ejb.HibernatePersistence</provider>

    <non-jta-data-source>dataSource</non-jta-data-source>

    <properties>
        <property name="hibernate.dialect" value="com.ernst.ernstWeb.mySqlDialectExtended.MySqlDialectExtended"/>
        <property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver"/>

        <property name="hibernate.connection.url"
                  value="jdbc:mysql://localhost:3306/lagerstand?autoReconnect=true"/>
        <property name="hibernate.connection.username" value="root"/>
        <property name="hibernate.connection.password" value="sekhar"/>
        <property name="hibernate.archive.autodetection" value="hbm, class"/>
        <property name="hibernate.generate_statistics" value="true"/>
        <property name="hibernate.cache.use_structured_entries" value="true"/>
        <property name="hibernate.format_sql" value="true"/>
        <property name="hibernate.show_sql" value="false"/>
        <property name="use_sql_comments" value="false"/>
        <property name="hibernate.hbm2ddl.auto" value="update"/>

    </properties>

</persistence-unit>

数据未插入数据库JPA + Hibernate

3 个答案: