我的项目中需要SQLite数据库,但是SQL不如HQL方便。所以我们有 Hibernate 和 SQLite。 项目是在 NetBeans 8.2 中制作的,我的操作系统是 Ubuntu 17.10。
例如,我们有一个用于测试的小型项目
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>
我的类(class)名为“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>
以及主要代码
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);
}
}
数据库是通过 NetBeans 中的“服务”选项卡创建的。它的名字是stuff.db。
我使用 Hibernate 4.3 (JPA 2.1)
Hibernate 4 SQLite 方言取自此处:link
session 打开和关闭都很好,数据库文件会在我的主文件夹中自动创建。但由于某种原因,表没有创建,我真的不知道为什么。
最佳答案
pom:SQLite JDBC 库
<dependency>
<groupId>org.xerial</groupId>
<artifactId>sqlite-jdbc</artifactId>
<version>3.7.2</version>
</dependency>
在 hibernate 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>
关于java - Hibernate + SQLite 不创建表,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/48414625/