I am using Eclipse, Xammp (tomcat and MySQL DB) and Hibernate.
this all works good, but I can't create that the ID from the Entity will be auto_increment
in the Database
My Entity:
package com.jwt.hibernate.bean;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import org.hibernate.annotations.GenericGenerator;
@Entity
public class User {
@Id
@GenericGenerator(name="generator", strategy="increment")
@GeneratedValue(generator="generator")
private Long userId;
private String userName;
private String password1;
private String email;
private String phone;
private String city;
public Long getUserId() {
return userId;
}
public void setUserId(Long userId) {
this.userId = userId;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getPassword1() {
return password1;
}
public void setPassword1(String password1) {
this.password1 = password1;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
public String getCity() {
return city;
}
public void setCity(String city) {
this.city = city;
}
}
I create a hbm.xml for this Entity with a Plugin from Hibernate and use Hibernate XML Mapping file(hbm.xml)
: Created hbm.xml:
<?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 06.05.2016 11:59:26 by Hibernate Tools 3.5.0.Final -->
<hibernate-mapping>
<class name="com.jwt.hibernate.bean.User" table="USER">
<id name="userId" type="java.lang.Long">
<column name="USERID" />
<generator class="assigned" />
</id>
<property name="userName" type="java.lang.String">
<column name="USERNAME" />
</property>
<property name="password1" type="java.lang.String">
<column name="PASSWORD1" />
</property>
<property name="email" type="java.lang.String">
<column name="EMAIL" />
</property>
<property name="phone" type="java.lang.String">
<column name="PHONE" />
</property>
<property name="city" type="java.lang.String">
<column name="CITY" />
</property>
</class>
</hibernate-mapping>
My hibernate.cfg.xml:
<?xml version="1.0" encoding="UTF-8"?>
<!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.url">jdbc:mysql://localhost:3306/test</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="current_session_context_class">thread</property>
<property name="hbm2ddl.auto">create-drop</property>
<property name="show_sql">true</property>
<mapping resource="/com/jwt/hibernate/bean/User.hbm.xml" />
</session-factory>
</hibernate-configuration>
If i start my Code, the Console do:
Hibernate: drop table if exists USER
Hibernate: create table USER (USERID bigint not null, USERNAME varchar(255), PASSWORD1 varchar(255), EMAIL varchar(255), PHONE varchar(255), CITY varchar(255), primary key (USERID))
Every thing is fine but my ID isn't auto_increment
and I don't know why. I tried a lot of Annotations. other Annotations for Example ManyToMany
or ManyToOne
works, but nut the @GeneratedValue
Use
<id name="userId" type="java.lang.Long">
<column name="USERID" />
<generator class="native" />
</id>
Instead of following line
<id name="userId" type="java.lang.Long">
<column name="USERID" />
<generator class="assigned" />
</id>
You can do use this annotations on your getUserId method :
@Id
@GenericGenerator(name = "id_generator", strategy = "increment")
@GeneratedValue(generator = "id_generator")
@Column(name = "id", unique = true, nullable = false)
public Long getUserId() {
return userId;
}
or you can also do this in your current code just specify @Column on getUserId method
@Column(name = "id", unique = true, nullable = false)
public Long getUserId() {
return userId;
}
If you will use annotations, this is pretty enough
@Id
@GeneratedValue
@Column(name = "id")
public Long getUserId() {
return userId;
}
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