[英]Hibernate + SQLite do not create tables
我的項目中需要SQLite數據庫,但是SQL不像HQL那樣方便。 因此,我們在SQLite中使用了Hibernate。 項目是在NetBeans 8.2中進行的,我的操作系統是Ubuntu 17.10。
因此,例如,我們有一個用於測試的小型項目
hibernate.cfg.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="hibernate.connection.driver_class">org.sqlite.JDBC</property>
<property name="hibernate.connection.url">jdbc:sqlite:stuff.db</property>
<property name="hibernate.dialect">com.enigmabridge.hibernate.dialect.SQLiteDialect</property>
<property name="hibernate.hbm2ddl.auto">create</property>
<property name="hibernate.show_sql">true</property>
<mapping resource="stuff/Stuff.hbm.xml"/>
</session-factory>
</hibernate-configuration>
我的課叫做Stuff:
package stuff;
public class Stuff {
private Integer id;
private String stuff;
public Stuff() {
}
public Stuff(String stuff) {
this.stuff = stuff;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getStuff() {
return stuff;
}
public void setStuff(String stuff) {
this.stuff = stuff;
}
@Override
public String toString() {
return "Stuff{" + "id=" + id + ", stuff=" + stuff + '}';
}
}
映射文件
<hibernate-mapping>
<class name="stuff.Stuff" table="stuff">
<id name="id" type="integer" column="id">
<generator class="increment"/>
</id>
<property name="stuff" type="string" column="stuff"/>
</class>
</hibernate-mapping>
和主要代碼
package stuff;
import java.util.List;
import org.hibernate.Query;
import org.hibernate.Session;
public class Main {
public static void main(String[] args) {
Session session = HibernateUtil.getSessionFactory().openSession();
session.beginTransaction();
session.save(new Stuff("blah blah"));
//Query q = s.createQuery("select from Stuff");
//List<Stuff> l = q.list();
//for (Stuff s:l)System.out.println(s);
session.getTransaction().commit();
session.close();
System.exit(0);
}
}
數據庫是通過NetBeans中的“服務”選項卡創建的。 它的名稱是stuff.db。
我使用Hibernate 4.3(JPA 2.1)
Hibernate 4 SQLite方言摘自此處: link
會話打開和關閉都很好,數據庫文件會自動在我的主文件夾中創建。 但是由於某種原因,表沒有被創建,我真的不知道為什么。
pom:SQLite JDBC庫
<dependency>
<groupId>org.xerial</groupId>
<artifactId>sqlite-jdbc</artifactId>
<version>3.7.2</version>
</dependency>
在休眠配置中:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="show_sql">true</property>
<property name="format_sql">true</property>
<property name="dialect">org.hibernate.dialect.SQLiteDialect</property>
<property name="connection.driver_class">org.sqlite.JDBC</property>
<property name="connection.url">jdbc:sqlite:mydb.db</property>
<property name="connection.username"></property>
<property name="connection.password"></property>
<property name="hibernate.hbm2ddl.auto">update</property>
<mapping class="your mapping class"/>
</session-factory>
</hibernate-configuration>
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