hibernate 乐观锁 测试 博客分类： 多线程

准备环境：

    表：demo_lock

CREATE TABLE `demo_lock` (
`id` int(12) NOT NULL AUTO_INCREMENT,
`aversion` int(12) NOT NULL DEFAULT '0',
`avalue` int(12) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;

-- ----------------------------
-- Records of demo_lock
-- ----------------------------
INSERT INTO `demo_lock` VALUES ('1', '0', '0');

 映射类：

import java.io.Serializable;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;
import javax.persistence.Version;

import org.hibernate.annotations.GenericGenerator;
/**
 * hibernate 乐观锁测试
 *
 */
@Entity
@Table(name = "demo_lock")
public class DemoLock implements Serializable {

	/**
	 * 
	 */
	private static final long serialVersionUID = -8908901013537360047L;
	
	
	@GenericGenerator(name = "generator", strategy = "increment")
	@GeneratedValue(generator = "generator")
	@Id
	@Column(name = "id", unique = true, nullable = false) 
	private Integer id;
	
	/**
	 * 版本号
	 */
	@Version  
	@Column(name = "aversion" ) 
	private int aversion;
	
	/**
	 * 
	 */
	@Column(name = "avalue" ) 
	private int avalue;

	public Integer getId() {
		return id;
	}

	public void setId(Integer id) {
		this.id = id;
	}

	public int getAversion() {
		return aversion;
	}

	public void setAversion(int aversion) {
		this.aversion = aversion;
	}

	public int getAvalue() {
		return avalue;
	}

	public void setAvalue(int avalue) {
		this.avalue = avalue;
	}
}

 DAO：

@Repository
@Scope("prototype")
public class DemoLockDaoImpl extends BaseDAOImpl implements DemoLockDao {

}

 Service：

import java.sql.SQLException;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Service;

import com.gxkj.web.jiancai.daos.DemoLockDao;
import com.gxkj.web.jiancai.entitys.DemoLock;
import com.gxkj.web.jiancai.services.DemoLockService;
@Service
@Scope("prototype")
public class DemoLockServiceImpl implements DemoLockService {

	@Autowired
	private DemoLockDao demoLockDao; 
	
	public DemoLock getDemoLockById(int id) throws SQLException {
		return (DemoLock) demoLockDao.selectById(id, DemoLock.class);
	}

	public void updateDemoLock(DemoLock entity) throws SQLException {
		demoLockDao.update(entity);
	}
}

 注意事项：修改时version是必填参数。