Admin: 1 версия

2010-06-01T05:18:22Z

1 версия

в 17:44, 31 мая 2010

2010-05-31T17:44:27Z

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== Many To One Cascade Merge ==

File: Department.java



<source lang="java">
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
@Entity
public class Department {
@Id @GeneratedValue(strategy=GenerationType.IDENTITY)
private int id;
private String name;
public int getId() {
return id;
}

public void setId(int id) {
this.id = id;
}

public String getName() {
return name;
}

public void setName(String deptName) {
this.name = deptName;
}
public String toString() {
return "Department id: " + getId() +
", name: " + getName();
}
}</source>



== Many To One Cascade Remove ==

File: Student.java



<source lang="java">
import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.ManyToOne;
@Entity
public class Student {
@Id
private int id;
private String name;

@ManyToOne(cascade=CascadeType.REMOVE)
Address address;
public int getId() {
return id;
}

public void setId(int id) {
this.id = id;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}
public Address getAddress() {
return address;
}

public void setAddress(Address address) {
this.address = address;
}
public String toString() {
return "Student id: " + getId() + " name: " + getName() +
" with " + getAddress();
}
}</source>



== Many To One Cascasde Persist ==

File: Student.java



<source lang="java">
import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.ManyToOne;
@Entity
public class Student {
@Id
private int id;
private String name;

@ManyToOne(cascade=CascadeType.PERSIST)
Address address;
public int getId() {
return id;
}

public void setId(int id) {
this.id = id;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}
public Address getAddress() {
return address;
}

public void setAddress(Address address) {
this.address = address;
}
public String toString() {
return "Student id: " + getId() + " name: " + getName() +
" with " + getAddress();
}
}</source>



== Many To One Insertable Nullable Updatable ==

File: Department.java



<source lang="java">
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
@Entity
public class Department {
@Id @GeneratedValue(strategy=GenerationType.IDENTITY)
private int id;
private String name;
public int getId() {
return id;
}

public void setId(int id) {
this.id = id;
}

public String getName() {
return name;
}

public void setName(String deptName) {
this.name = deptName;
}
public String toString() {
return "Department id: " + getId() +
", name: " + getName();
}
}</source>



== Many To One Mapping Manually Linking ==

File: Student.java



<source lang="java">
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.ManyToOne;
@Entity
public class Student {
@Id @GeneratedValue(strategy=GenerationType.IDENTITY)
private int id;
private String name;
@ManyToOne
private Department department;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}

public Department getDepartment() {
return department;
}
public void setDepartment(Department department) {
this.department = department;
}
public String toString() {
return "\n\nID:" + id + "\nName:" + name + "\n\n";
}
}</source>



== Many To One Mapping Unique Join Column ==

File: Student.java



<source lang="java">
import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
@Entity
public class Student {
@Id @GeneratedValue(strategy=GenerationType.IDENTITY)
private int id;
private String name;
@ManyToOne(cascade=CascadeType.ALL)
@JoinColumn(name="DEPT_ID", unique= true, nullable=true, insertable=true, updatable=true)
private Department department;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}

public Department getDepartment() {
return department;
}
public void setDepartment(Department department) {
this.department = department;
}
public String toString() {
return "\n\nID:" + id + "\nName:" + name + "\n\n" + department;
}
}</source>



== Many to One Map With Entity Hierarchy ==

File: Employee.java



<source lang="java">
import java.util.Date;
import javax.persistence.AssociationOverride;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Inheritance;
import javax.persistence.InheritanceType;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.MappedSuperclass;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
@Entity
@Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)
public abstract class Employee {
@Id
private int id;
private String name;
@Temporal(TemporalType.DATE)
private Date startDate;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Date getStartDate() {
return startDate;
}
public void setStartDate(Date startDate) {
this.startDate = startDate;
}
public String toString() {
return "Employee id: " + getId() + " name: " + getName();
}
}
@MappedSuperclass
abstract class CompanyEmployee extends Employee {
private int vacation;
@ManyToOne
private Employee manager;
public int getVacation() {
return vacation;
}
public void setVacation(int vacation) {
this.vacation = vacation;
}
public Employee getManager() {
return manager;
}
public void setManager(Employee manager) {
this.manager = manager;
}
}
@Entity
@AssociationOverride(name = "manager", joinColumns = @JoinColumn(name = "MGR"))
class PartTimeEmployee extends CompanyEmployee {
private float hourlyRate;
public float getHourlyRate() {
return hourlyRate;
}
public void setHourlyRate(float hourlyRate) {
this.hourlyRate = hourlyRate;
}
public String toString() {
return "PartTimeEmployee id: " + getId() + " name: " + getName();
}
}
@Entity
class FullTimeEmployee extends CompanyEmployee {
private long salary;

private long pensionContribution;
public long getPensionContribution() {
return pensionContribution;
}
public void setPensionContribution(long pension) {
this.pensionContribution = pension;
}
public long getSalary() {
return salary;
}
public void setSalary(long salary) {
this.salary = salary;
}
public String toString() {
return "FullTimeEmployee id: " + getId() + " name: " + getName();
}
}</source>



== Many To One Set Join Column Name ==

File: Student.java



<source lang="java">
import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
@Entity
public class Student {
@Id @GeneratedValue(strategy=GenerationType.IDENTITY)
private int id;
private String name;
@ManyToOne(cascade=CascadeType.ALL)
@JoinColumn(name="DEPT_ID")
private Department department;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}

public Department getDepartment() {
return department;
}
public void setDepartment(Department department) {
this.department = department;
}
public String toString() {
return "\n\nID:" + id + "\nName:" + name + "\n\n" + department;
}
}</source>



== Mapping Relationship State ==

File: Project.java



<source lang="java">
import java.util.ArrayList;
import java.util.Collection;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.OneToMany;
@Entity
public class Project {
@Id private int id;
private String name;

@OneToMany(mappedBy="project")
private Collection<ProjectAssignment> assignments;
public Project() {
assignments = new ArrayList<ProjectAssignment>();
}

public int getId() {
return id;
}

public void setId(int projectNo) {
this.id = projectNo;
}

public String getName() {
return name;
}

public void setName(String projectName) {
this.name = projectName;
}

public Collection<ProjectAssignment> getAssignments() {
return assignments;
}

public String toString() {
return " no: " + getId() +
", name: " + getName();
}
}</source>

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Admin: 1 версия

в 17:44, 31 мая 2010