[BAEL-4958] JPA Unique Constraint (#10793)

* [BAEL-4958] JPA Unique Constraint

Defining Unique Constraints in JPA

* [BAEL-4958] JPA Unique Constraint

Changed the field name from pAddress to streetAddress

* [BAEL-4958] JPA Unique Constraint

Resolved conflicts

* [BAEL-4958] JPA Unique Constraint

Getters and setters are changed for address field

* [BAEL-4958] JPA Unique Constraint

Fixed Junits

* [BAEL-4958] JPA Unique Constraint

Fixed id field

Co-authored-by: MeenaGawande <MeenaGawande@users.noreply.github.com>

persistence-modules/java-jpa-3/src/main/java/com/baeldung/jpa/uniqueconstraints/Address.java

@@ -0,0 +1,37 @@
+package com.baeldung.jpa.uniqueconstraints;
+
+import java.io.Serializable;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.Id;
+import javax.persistence.Table;
+
+@Entity
+@Table
+public class Address implements Serializable {
+    
+    private static final long serialVersionUID = 1L;
+
+    @Id
+    @GeneratedValue
+    private Long id;
+    
+    private String streetAddress;
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getStreetAddress() {
+        return streetAddress;
+    }
+
+    public void setStreetAddress(String streetAddress) {
+        this.streetAddress = streetAddress;
+    }
+}

persistence-modules/java-jpa-3/src/main/java/com/baeldung/jpa/uniqueconstraints/Person.java

@@ -0,0 +1,116 @@
+package com.baeldung.jpa.uniqueconstraints;
+
+import java.io.Serializable;
+
+import javax.persistence.Column;
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.Id;
+import javax.persistence.JoinColumn;
+import javax.persistence.Table;
+import javax.persistence.UniqueConstraint;
+
+@Entity
+@Table(uniqueConstraints = { @UniqueConstraint(name = "UniqueNumberAndStatus", columnNames = { "personNumber", "isActive" }),
+                             @UniqueConstraint(name = "UniqueSecurityAndDepartment", columnNames = { "securityNumber", "departmentCode" }),
+                             @UniqueConstraint(name = "UniqueNumberAndAddress", columnNames = { "personNumber", "address" }) })
+public class Person implements Serializable {
+
+    private static final long serialVersionUID = 1L;
+
+    @Id
+    @GeneratedValue
+    private Long id;
+    
+    private String name;
+    
+    private String password;
+
+    @Column(unique = true)
+    private String email;
+
+    @Column(unique = true)
+    private Long personNumber;
+
+    private Boolean isActive;
+    
+    private String securityNumber;
+    
+    private String departmentCode;
+
+    @Column(unique = true)
+    @JoinColumn(name = "addressId", referencedColumnName = "id")
+    private Address address;
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getPassword() {
+        return password;
+    }
+
+    public void setPassword(String password) {
+        this.password = password;
+    }
+
+    public String getEmail() {
+        return email;
+    }
+
+    public void setEmail(String email) {
+        this.email = email;
+    }
+
+    public Long getPersonNumber() {
+        return personNumber;
+    }
+
+    public void setPersonNumber(Long personNumber) {
+        this.personNumber = personNumber;
+    }
+
+    public Boolean getIsActive() {
+        return isActive;
+    }
+
+    public void setIsActive(Boolean isActive) {
+        this.isActive = isActive;
+    }
+
+    public String getScode() {
+        return securityNumber;
+    }
+
+    public void setScode(String scode) {
+        this.securityNumber = scode;
+    }
+
+    public String getDcode() {
+        return departmentCode;
+    }
+
+    public void setDcode(String dcode) {
+        this.departmentCode = dcode;
+    }
+
+    public Address getAddress() {
+        return address;
+    }
+
+    public void setAddress(Address address) {
+        this.address = address;
+    }
+}

persistence-modules/java-jpa-3/src/main/resources/META-INF/persistence.xml

@@ -113,6 +113,22 @@
             <property name="hibernate.temp.use_jdbc_metadata_defaults" value="false"/>
         </properties>
     </persistence-unit>
+    <persistence-unit name="jpa-unique-constraints">
+        <provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
+        <class>com.baeldung.jpa.uniqueconstraints.Person</class>
+        <class>com.baeldung.jpa.uniqueconstraints.Address</class>
+        <exclude-unlisted-classes>true</exclude-unlisted-classes>
+        <properties>
+            <property name="javax.persistence.jdbc.driver" value="org.h2.Driver" />
+            <property name="javax.persistence.jdbc.url" value="jdbc:h2:mem:test" />
+            <property name="javax.persistence.jdbc.user" value="sa" />
+            <property name="javax.persistence.jdbc.password" value="" />
+            <property name="hibernate.dialect" value="org.hibernate.dialect.H2Dialect" />
+            <property name="hibernate.hbm2ddl.auto" value="create-drop" />
+            <property name="show_sql" value="true" />
+            <property name="hibernate.temp.use_jdbc_metadata_defaults" value="false" />
+        </properties>
+	</persistence-unit>
     <persistence-unit name="jpa-h2-return-multiple-entities">
         <provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
         <class>com.baeldung.jpa.returnmultipleentities.Channel</class>