参考文章JPA实体类监听器@EntityListeners注解使用实例_疯狂的蜗牛-CSDN博客_entitylisteners
本文源码
这也是来源于工作中的一个小需求，因为产品迭代时，需要给前端创建人，但是由于创建人是在操作记录的表里记录的，如果每次都要进行查询，效率很低，所以统一在数据表里加上创建人名称和创建人id，为了达到方便、批量的目的，就使用了jpa的实体监听器。
创建springboot项目，导入pom.xml
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| <?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.3.1.RELEASE</version>
<relativePath/>
</parent>
<groupId>top.meethigher</groupId>
<artifactId>jpa-entitylistener-test</artifactId>
<version>1.0.0</version>
<name>jpa-entitylistener-test</name>
<description>chenchuancheng's demo</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.xerial</groupId>
<artifactId>sqlite-jdbc</artifactId>
<version>3.34.0</version>
</dependency>
<dependency>
<groupId>com.github.gwenn</groupId>
<artifactId>sqlite-dialect</artifactId>
<version>0.1.2</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
|
创建配置文件application.yml
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|
server:
port: 9090
ssl:
enabled: false
spring:
datasource:
driver-class-name: org.sqlite.JDBC
url: jdbc:sqlite:D:/test.db
jpa:
database-platform: org.sqlite.hibernate.dialect.SQLiteDialect
hibernate:
ddl-auto: update
naming:
physical-strategy: org.hibernate.boot.model.naming.PhysicalNamingStrategyStandardImpl
show-sql: true
mvc:
async:
request-timeout: 30000
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创建实体，@EntityListeners里面配置的是监听器对象
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| @Entity
@EntityListeners(TestEntityListener.class)
public class TestEntity {
@Id
@Column(name = "id", length = 36, nullable = false)
@GenericGenerator(name = "idGenerator", strategy = "uuid")
@GeneratedValue(generator = "idGenerator")
private String id;
private String name;
@Embedded
private CommonField commonField;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public CommonField getCommonField() {
return commonField;
}
public void setCommonField(CommonField commonField) {
this.commonField = commonField;
}
@Override
public String toString() {
return "TestEntity{" +
"id='" + id + '\'' +
", name='" + name + '\'' +
", commonField=" + commonField +
'}';
}
}
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创建实体公共创建人对象
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| @Embeddable
public class CommonField {
private Date createTime;
private Date updateTime;
private String createUserId;
private String createUserName;
public Date getCreateTime() {
return createTime;
}
public void setCreateTime(Date createTime) {
this.createTime = createTime;
}
public Date getUpdateTime() {
return updateTime;
}
public void setUpdateTime(Date updateTime) {
this.updateTime = updateTime;
}
public String getCreateUserId() {
return createUserId;
}
public void setCreateUserId(String createUserId) {
this.createUserId = createUserId;
}
public String getCreateUserName() {
return createUserName;
}
public void setCreateUserName(String createUserName) {
this.createUserName = createUserName;
}
@Override
public String toString() {
return "CommonField{" +
"createTime=" + createTime +
", updateTime=" + updateTime +
", createUserId='" + createUserId + '\'' +
", createUserName='" + createUserName + '\'' +
'}';
}
}
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创建jpa实体监听器，里面使用的这四个注解，顾名思义即可。
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| public class TestEntityListener {
@PrePersist
public void PrePersist(Object entity) {
System.out.println("进行insert之前");
if(entity instanceof TestEntity) {
System.out.println(entity.toString());
CommonField commonField = ((TestEntity) entity).getCommonField();
if(ObjectUtils.isEmpty(commonField)) {
commonField=new CommonField();
commonField.setCreateTime(new Date());
commonField.setUpdateTime(new Date());
commonField.setCreateUserId("111");
commonField.setCreateUserName("ccc");
((TestEntity) entity).setCommonField(commonField);
}
System.out.println(entity.toString());
}
}
@PostPersist
public void PostPersist(Object entity) {
System.out.println("进行insert之后");
}
@PreUpdate
public void PreUpdate(Object entity) {
System.out.println("进行update之前");
}
@PostUpdate
public void PostUpdate(Object entity) {
System.out.println("进行update之后");
}
}
|
