There is a better way to practice:
Create a parent class first
/*General fields for all domain classes*/
@Data
public class BaseDomain implements Serializable {
/*These values are common. During the INSERT/UPDATE operation, these values will be automatically updated. For the specific implementation, please refer to MyMetaObjecthandler*/
@TableField(fill = FieldFill.INSERT_UPDATE)
public Integer yn;
@TableField(fill = FieldFill.INSERT_UPDATE)
public String creator;
@TableField(fill = FieldFill.INSERT_UPDATE)
public String updater;
@TableField(fill = FieldFill.INSERT_UPDATE)
public Date createTime;
@TableField(fill = FieldFill.INSERT_UPDATE)
public Date updateTime;
}
Then our entity classes inherit this class
@TableName(value ="student")
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Student extends BaseDomain {
@TableId(type = )
private Integer id;
private String studentName;
private String studentPassword;
private String teacheruuid;
private String phone;
private String address;
@TableField(exist = false)
private static final long serialVersionUID = 1L;
@Override
public boolean equals(Object that) {
if (this == that) {
return true;
}
if (that == null) {
return false;
}
if (getClass() != ()) {
return false;
}
Student other = (Student) that;
return (() == null ? () == null : ().equals(()))
&& (() == null ? () == null : ().equals(()))
&& (() == null ? () == null : ().equals(()))
&& (() == null ? () == null : ().equals(()))
&& (() == null ? () == null : ().equals(()))
&& (() == null ? () == null : ().equals(()))
&& (() == null ? () == null : ().equals(()))
&& (() == null ? () == null : ().equals(()))
&& (() == null ? () == null : ().equals(()))
&& (() == null ? () == null : ().equals(()))
&& (() == null ? () == null : ().equals(()));
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((getId() == null) ? 0 : getId().hashCode());
result = prime * result + ((getStudentName() == null) ? 0 : getStudentName().hashCode());
result = prime * result + ((getStudentPassword() == null) ? 0 : getStudentPassword().hashCode());
result = prime * result + ((getTeacheruuid() == null) ? 0 : getTeacheruuid().hashCode());
result = prime * result + ((getPhone() == null) ? 0 : getPhone().hashCode());
result = prime * result + ((getAddress() == null) ? 0 : getAddress().hashCode());
result = prime * result + ((getYn() == null) ? 0 : getYn().hashCode());
result = prime * result + ((getCreator() == null) ? 0 : getCreator().hashCode());
result = prime * result + ((getUpdater() == null) ? 0 : getUpdater().hashCode());
result = prime * result + ((getCreateTime() == null) ? 0 : getCreateTime().hashCode());
result = prime * result + ((getUpdateTime() == null) ? 0 : getUpdateTime().hashCode());
return result;
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
(getClass().getSimpleName());
(" [");
("Hash = ").append(hashCode());
(", , studentName=").append(studentName);
(", studentPassword=").append(studentPassword);
(", teacheruu, phone=").append(phone);
(", address=").append(address);
(", yn=").append(yn);
(", creator=").append(creator);
(", updater=").append(updater);
(", createTime=").append(createTime);
(", updateTime=").append(updateTime);
(", serialVersionUID=").append(serialVersionUID);
("]");
return ();
}
}
Then write MetaObjectHandler
/*The function of this class is:
* Added the INSERT_UPDATE set to the entity class to automatically fill the property in the new or updated operation*/
*
@Component //Note that you need to put it in the container herepublic class MyMetaObjecthandler implements MetaObjectHandler {
// There are several public attributes// public Integer yn;
// public String creator;
// public String updater;
// public Date createTime;
// public Date updateTime;
@Override
public void insertFill(MetaObject metaObject) {
Date now = new Date();
/*If the object has no value when the insertion operation, the object has a default fill*/
if (("yn") == null) {
setFieldValByName("yn", 1, metaObject);
}
if (("creator") == null) {
/* Here you can combine the security context to get the operator. I wrote it here simply, so I directly use admin to assign values*/
setFieldValByName("creator", "admin", metaObject);
}
if (("updater") == null) {
/* Here you can combine the security context to get the operator. I wrote it here simply, so I directly use admin to assign values*/
setFieldValByName("updater", "admin", metaObject);
}
if (("createTime") == null) {
setFieldValByName("createTime", now, metaObject);
}
if (("updateTime") == null) {
setFieldValByName("updateTime", now, metaObject);
}
}
@Override
public void updateFill(MetaObject metaObject) {
/*The logic is different when updating. The prerequisite for updating is that there is an object, so some values of the object cannot be moved casually.
* For example, yn, and the updater and update time can change*/
if (("updater") == null) {
/* Here you can combine the security context to get the operator. I wrote it here simply, so I directly use admin to assign values*/
setFieldValByName("updater", "admin1231231", metaObject);
}
if (("updateTime") == null) {
setFieldValByName("updateTime", new Date(), metaObject);
}
}
}
This is fine. Of course, you can also do these operations on a specified class. For example, I just want to do these operations on objects of Student class when updating and inserting them? You can use metaObject to achieve it.
For example:
if ("".equals( ().getClass().getName()) ) {
Date now = new Date();
/*If the object has no value when the insertion operation, the object has a default fill*/
if (("yn") == null) {
setFieldValByName("yn", 1, metaObject);
}
if (("creator") == null) {
/* Here you can combine the security context to get the operator. I wrote it here simply, so I directly use admin to assign values*/
setFieldValByName("creator", "admin", metaObject);
}
if (("updater") == null) {
/* Here you can combine the security context to get the operator. I wrote it here simply, so I directly use admin to assign values*/
setFieldValByName("updater", "admin", metaObject);
}
if (("createTime") == null) {
setFieldValByName("createTime", now, metaObject);
}
if (("updateTime") == null) {
setFieldValByName("updateTime", now, metaObject);
}
}
After testing
()
()
()
All are in line with our expectations
Summarize
The above is personal experience. I hope you can give you a reference and I hope you can support me more.