Lets assume, I have two simple tables to implement in my Spring Boot
application.
Here is the ER diagram :
Here is my PasswordReset
class :
@Data
@Entity
public class PasswordReset {
@Id @GeneratedValue Long passwordResetID;
String eMail;
String token;
String createdAt;
PasswordReset()
{
}
public PasswordReset(String eMail,String token,String createdAt)
{
this.eMail=eMail;
this.token=token;
this.createdAt=createdAt;
}
}
And here is my User
class (partially) :
@Data
@Entity
public class User {
@Id @GeneratedValue Long UserID;
String eMail;
String createdAt;
String updatedAt;
User()
{
}
public User(String eMail,String createdAt,String updatedAt)
{
this.eMail=eMail;
this.createdAt=createdAt;
this.updatedAt=updatedAt;
}
}
Now my question is how can I create foreign key like my ER diagram in my Spring Boot project?
Here is my pom.xml
:
<?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 http://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>2.1.6.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.mua</groupId>
<artifactId>cse616</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>cse616</name>
<description>Project for CSE-616</description>
<properties>
<java.version>11</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web-services</artifactId>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
mappedBy
at Parent Entity (owning Entity)CascadeType.PERSIST
, CascadeType.ALL
to save a child with a parent at one request (you may find others according to need CascadeType ) @JoinColumn
at a child Entity on which Column we have to join User.java
@OneToMany(mappedBy="user",fetch=FetchType.LAZY,cascade = CascadeType.PERSIST)
private List<ResetPassword> resetpassword = new ArrayList<ResetPassword>();
ResetPassword.java
@ManyToOne(fetch = FetchType.LAZY, targetEntity = User.class)
@JoinColumn(name="userId", referencedColumnName = "userId", nullable = false)
private User user;
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