自定义主键生成策略

自定义主键生成策略

Worker实体类：

package com.liuyongqi.MavenHibernateDemo2.entity;

import java.io.Serializable;

/**
 * worker工人实体类
 * @author Administrator
 * @data   2018年8月1日
 * @time   下午4:17:34
 */
public class Worker implements Serializable{

	/**
	 * 
	 */
	private static final long serialVersionUID = -1110648352223617488L;
	private String wid;
	private String wname;
	
	public Worker() {
		super();
		// TODO Auto-generated constructor stub
	}
	public Worker(String wid, String wname) {
		super();
		this.wid = wid;
		this.wname = wname;
	}
	public String getWid() {
		return wid;
	}
	public void setWid(String wid) {
		this.wid = wid;
	}
	public String getWname() {
		return wname;
	}
	public void setWname(String wname) {
		this.wname = wname;
	}
	@Override
	public String toString() {
		return "Worker [wid=" + wid + ", wname=" + wname + "]";
	}
	
	
	
}

实体类映射文件Worker.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 2018-8-1 16:22:52 by Hibernate Tools 3.5.0.Final -->
<hibernate-mapping>
    <class name="com.liuyongqi.MavenHibernateDemo2.entity.Worker" table="t_worker">
        <id name="wid" type="java.lang.String">
            <column name="WID" />
            <!--uuid: 是由容器自动生成的一个32位的字符串，.hex代表的是十六进制)
   32位的字符串，无需赋值， -->
            <generator class="com.liuyongqi.MavenHibernateDemo2.id.CustomPrimary" />
        </id>
        <property name="wname" type="java.lang.String">
            <column name="WNAME" />
        </property>
    </class>
</hibernate-mapping>

dao方法：

package com.liuyongqi.MavenHibernateDemo2.dao;

import java.io.Serializable;
import java.sql.CallableStatement;
import java.sql.Connection;
import java.sql.SQLException;
import java.sql.Types;

import org.hibernate.Session;
import org.hibernate.Transaction;

import com.liuyongqi.MavenHibernateDemo2.entity.Student;
import com.liuyongqi.MavenHibernateDemo2.entity.Worker;
import com.liuyongqi.MavenHibernateDemo2.util.DBHelper;
import com.liuyongqi.MavenHibernateDemo2.util.SessionFactoryUtil;

/**
 * 工人实体类doa方法
 * @author Administrator
 * @data   2018年8月1日
 * @time   下午4:29:29
 */
public class WorkerDao {
	public String PrimaryStrategies() {
		String sql="{call pro_primaryStrategies(?)}";
		Connection con = DBHelper.getcon();
		CallableStatement cs;
		String str="";
		try {
			cs = con.prepareCall(sql);
			cs.registerOutParameter(1, Types.VARCHAR);
			cs.execute();
			str=cs.getString(1);
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}		
		return str;
		
	}

}

 自定义主键生成策略CustomPrimary类：

package com.liuyongqi.MavenHibernateDemo2.id;

import java.io.Serializable;

import org.hibernate.HibernateException;
import org.hibernate.engine.spi.SharedSessionContractImplementor;
import org.hibernate.id.IdentifierGenerator;

import com.liuyongqi.MavenHibernateDemo2.dao.WorkerDao;

/**
 * 自定义主键生成策略
 * @author Administrator
 * @data   2018年8月3日
 * @time   下午2:38:04
 */
public class CustomPrimary implements IdentifierGenerator{

	public Serializable generate(SharedSessionContractImplementor session, Object object) throws HibernateException {
		// TODO Auto-generated method stub
		String str = new WorkerDao().PrimaryStrategies();
		System.out.println(str);
		return str;
	}

}

数据库：

create table t_worker
(
  wid varchar(32) primary key,
  wname varchar(50) not null
);
select * from t_worker;
delete from t_worker;

存储过程：

create procedure pro_primaryStrategies(out str varchar(100))
begin	
	set @date=(select date_format(SYSDATE(), '%Y%m%d%H%i%s'));
	set str=@date;
end

核心配置文件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.password">root</property>
        <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/db_a?useUnicode=true&amp;characterEncoding=UTF-8</property>
        <property name="hibernate.connection.username">root</property>
        <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
        <property name="hibernate.hbm2ddl.auto">update</property>
        <!-- 显示sql语句 -->
        <property name="show_sql" >true</property>
        <!-- 格式化sql语句 -->
        <property name="format_sql" >true</property>
        
        <mapping resource="com/liuyongqi/MavenHibernateDemo2/entity/News.hbm.xml"/>
        <mapping resource="com/liuyongqi/MavenHibernateDemo2/entity/Student.hbm.xml"/>  
       <!--  <mapping resource="com/liuyongqi/MavenHibernateDemo2/entity/Student2.hbm.xml"/>  -->
        <mapping resource="com/liuyongqi/MavenHibernateDemo2/entity/Worker.hbm.xml"/>       
    </session-factory>
</hibernate-configuration>

运行前数据库的结果：

运行后数据库的结果：

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