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package sut.edu.zyp.dormitory.manage.entity;
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import java.io.Serializable;
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import java.util.Date;
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import org.hibernate.annotations.GenericGenerator;
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import org.springframework.data.annotation.CreatedDate;
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import org.springframework.data.annotation.LastModifiedDate;
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import javax.persistence.*;
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/**
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* 基础实体对象父类，所有的数据库表都要有的通用字段，其他所有的实体类（entity类)都需要继承此父类
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*
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* @author zyp
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* @version 0.0.1
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* @since 0.0.1
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*/
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@MappedSuperclass
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public abstract class AbstractBaseEntity implements Serializable {
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/**
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* id，用于唯一标识数据库的某一行记录，全局唯一
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*/
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@Id
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@GenericGenerator(name = "idGenerator", strategy = "uuid")
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@GeneratedValue(strategy = GenerationType.AUTO, generator = "idGenerator")
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@Column(unique = true, nullable = false, length = 32)
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private String id;
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/**
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* 创建时间，数据库记录第一次创建时的时间
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*/
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@Column(name = "create_time", nullable = false, columnDefinition = "TIMESTAMP DEFAULT CURRENT_TIMESTAMP")
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@CreatedDate
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private Date createTime;
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/**
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* 更新时间，数据库数据记录最后一次变更时间
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*/
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@Column(name = "update_time", nullable = false, columnDefinition = "TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP")
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@LastModifiedDate
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private Date updateTime;
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/**
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* 版本号，用于数据库的乐观锁，每次数据库记录发生变更，自动加1，首次变更为0
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*/
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@Version
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private Integer version;
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/**
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* 是否有效，用于数据库数据的逻辑删除，而非物理删除
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*/
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@Column(length = 1)
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private String valid = "1";
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public String getId() {
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return id;
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}
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public void setId(String id) {
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this.id = id;
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}
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public Date getCreateTime() {
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return createTime;
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}
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public void setCreateTime(Date createTime) {
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this.createTime = createTime;
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}
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public Date getUpdateTime() {
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return updateTime;
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}
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public void setUpdateTime(Date updateTime) {
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this.updateTime = updateTime;
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}
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public Integer getVersion() {
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return version;
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}
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public void setVersion(Integer version) {
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this.version = version;
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}
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public String getValid() {
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return valid;
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}
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public void setValid(String valid) {
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this.valid = valid;
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}
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}
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