в 17:44, 31 мая 2010

2010-05-31T17:44:27Z

Новая страница

== Abstract Class As Mapped Superclass ==

File: Customer.java



<source lang="java">
import java.io.Serializable;
import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.DiscriminatorColumn;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Inheritance;
import javax.persistence.InheritanceType;
import javax.persistence.JoinColumn;
import javax.persistence.MappedSuperclass;
import javax.persistence.OneToOne;
import javax.persistence.Table;
import javax.persistence.Version;
@Entity
@Table(name = "ADDRESS")
class Address implements Serializable {
protected String city;
@Id
protected Long id;

@Version
protected Long version;
@Column(name = "ZIP_CODE")
protected Long zipCode;
public Address() {
}
public String getCity() {
return city;
}
public void setCity(String city) {
this.city = city;
}
public void setId(Long id) {
this.id = id;
}
public Long getId() {
return id;
}
public Long getZipCode() {
return zipCode;
}
public void setZipCode(Long zipCode) {
this.zipCode = zipCode;
}
}
@Entity
@Inheritance(strategy = InheritanceType.JOINED)
@DiscriminatorColumn(name = "TYPE")
class Employee extends Person implements Serializable {
protected String email;
protected String dept;
public Employee() {
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getDept() {
return dept;
}
public void setDept(String dept) {
this.dept = dept;
}
}
@MappedSuperclass
abstract class Person implements Serializable {

@OneToOne(cascade = { CascadeType.ALL })
@JoinColumn(name = "HOME_ADDRESS", referencedColumnName = "ID")
private Address homeAddress;
@Id
@Column(nullable = false)
@GeneratedValue(generator = "PersonIdGenerator")
private Long id;

@Version
private Long version;
public Person() {
}
public Address getHomeAddress() {
return homeAddress;
}
public void setHomeAddress(Address homeAddress) {
this.homeAddress = homeAddress;
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
}</source>



== Adding Properties To SubClasses ==

File: Employee.java



<source lang="java">
import java.util.Date;
import javax.persistence.Column;
import javax.persistence.DiscriminatorColumn;
import javax.persistence.DiscriminatorValue;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Inheritance;
import javax.persistence.MappedSuperclass;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
@Entity
@Table(name = "EMP")
@Inheritance
@DiscriminatorColumn(name = "EMP_TYPE")
public abstract class Employee {
@Id
private int id;
private String name;
@Temporal(TemporalType.DATE)
@Column(name = "S_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 AbstractEmployee extends Employee {
private int vacation;
public int getVacation() {
return vacation;
}
public void setVacation(int vacation) {
this.vacation = vacation;
}
}
@Entity
@DiscriminatorValue("FTEmp")
class FullTimeEmployee extends AbstractEmployee {
private long salary;
private long pension;
public long getPension() {
return pension;
}
public void setPension(long pension) {
this.pension = pension;
}
public long getSalary() {
return salary;
}
public void setSalary(long salary) {
this.salary = salary;
}
public String toString() {
return "FullTimeEmployee id: " + getId() + " name: " + getName();
}
}
@Entity(name = "PTEmp")
@DiscriminatorValue("PTEmp")
class PartTimeEmployee extends AbstractEmployee {
@Column(name = "H_RATE")
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();
}
}</source>



== Add Properties In Abstract Entity ==

File: Helper.java



<source lang="java">
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.Statement;
public class Helper {
public static void checkData() throws Exception {
Class.forName("org.hsqldb.jdbcDriver");
Connection conn = DriverManager.getConnection("jdbc:hsqldb:data/tutorial", "sa", "");
Statement st = conn.createStatement();
ResultSet mrs = conn.getMetaData().getTables(null, null, null, new String[] { "TABLE" });
while (mrs.next()) {
String tableName = mrs.getString(3);
System.out.println("\n\n\n\nTable Name: "+ tableName);
ResultSet rs = st.executeQuery("select * from " + tableName);
ResultSetMetaData metadata = rs.getMetaData();
while (rs.next()) {
System.out.println(" Row:");
for (int i = 0; i < metadata.getColumnCount(); i++) {
System.out.println(" Column Name: "+ metadata.getColumnLabel(i + 1)+ ", ");
System.out.println(" Column Type: "+ metadata.getColumnTypeName(i + 1)+ ": ");
Object value = rs.getObject(i + 1);
System.out.println(" Column Value: "+value+"\n");
}
}
}
}
}</source>



== Change Inheritance Type ==

File: Employee.java



<source lang="java">
import java.util.Date;
import javax.persistence.Column;
import javax.persistence.DiscriminatorColumn;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Inheritance;
import javax.persistence.InheritanceType;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
@Entity
@Table(name="EMP")
@Inheritance(strategy=InheritanceType.JOINED)
@DiscriminatorColumn(name="EMP_TYPE")
public abstract class Employee {
@Id private int id;
private String name;
@Temporal(TemporalType.DATE)
@Column(name="S_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();
}
}
@Entity
@Table(name="COMPANY_EMP")
@Inheritance(strategy=InheritanceType.SINGLE_TABLE)
abstract class CompanyEmployee extends Employee {
private int vacation;

public int getVacation() {
return vacation;
}
public void setVacation(int vacation) {
this.vacation = vacation;
}
}
@Entity
class FullTimeEmployee extends CompanyEmployee {
private long salary;
@Column(name="PENSION")
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();
}
}
@Entity
class PartTimeEmployee extends CompanyEmployee {
@Column(name="H_RATE")
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();
}
}</source>



== Discriminator Column And Discriminator Value ==

File: Person.java



<source lang="java">
import javax.persistence.DiscriminatorColumn;
import javax.persistence.DiscriminatorType;
import javax.persistence.DiscriminatorValue;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Inheritance;
import javax.persistence.InheritanceType;
import javax.persistence.Table;
@Entity
@Table(name = "PERSON_HIERARCHY")
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
@DiscriminatorColumn(name = "DISCRIMINATOR", discriminatorType = DiscriminatorType.STRING)
@DiscriminatorValue("PERSON")
public class Person implements java.io.Serializable {
private int id;
private String firstName;
private String lastName;
@Id
@GeneratedValue
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String first) {
this.firstName = first;
}
public String getLastName() {
return lastName;
}
public void setLastName(String last) {
this.lastName = last;
}
}
@Entity
@DiscriminatorValue("CUST")
class Customer extends Person {
private String street;
private String city;
private String state;
private String zip;
public String getStreet() {
return street;
}
public void setStreet(String street) {
this.street = street;
}
public String getCity() {
return city;
}
public void setCity(String city) {
this.city = city;
}
public String getState() {
return state;
}
public void setState(String state) {
this.state = state;
}
public String getZip() {
return zip;
}
public void setZip(String zip) {
this.zip = zip;
}
}
@Entity
class Employee extends Customer {
private int employeeId;
public int getEmployeeId() {
return employeeId;
}
public void setEmployeeId(int id) {
employeeId = id;
}
}</source>



== Discriminator Type: INTEGER ==

File: Employee.java



<source lang="java">
import java.util.Date;
import javax.persistence.Column;
import javax.persistence.DiscriminatorColumn;
import javax.persistence.DiscriminatorType;
import javax.persistence.DiscriminatorValue;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Inheritance;
import javax.persistence.InheritanceType;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
@Entity
@Table(name="EMP")
@Inheritance(strategy=InheritanceType.JOINED)
@DiscriminatorColumn(name="EMP_TYPE", discriminatorType=DiscriminatorType.INTEGER)
public abstract class Employee {
@Id private int id;
private String name;
@Temporal(TemporalType.DATE)
@Column(name="S_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();
}
}

@Entity
@Table(name="PT_EMP")
@DiscriminatorValue("3")
class PartTimeEmployee extends Employee {
@Column(name="H_RATE")
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
@Table(name="FT_EMP")
@DiscriminatorValue("2")
class FullTimeEmployee extends Employee {
private long salary;
private long pension;

public long getPension() {
return pension;
}

public void setPension(long pension) {
this.pension = pension;
}

public long getSalary() {
return salary;
}

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



== Inheritance Type JOINED ==

File: Employee.java



<source lang="java">
import java.util.Date;
import javax.persistence.Column;
import javax.persistence.DiscriminatorColumn;
import javax.persistence.DiscriminatorType;
import javax.persistence.DiscriminatorValue;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Inheritance;
import javax.persistence.InheritanceType;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
@Entity
@Table(name="EMP")
@Inheritance(strategy=InheritanceType.JOINED)
@DiscriminatorColumn(name="EMP_TYPE", discriminatorType=DiscriminatorType.INTEGER)
public abstract class Employee {
@Id private int id;
private String name;
@Temporal(TemporalType.DATE)
@Column(name="S_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();
}
}

@Entity
@Table(name="PT_EMP")
@DiscriminatorValue("3")
class PartTimeEmployee extends Employee {
@Column(name="H_RATE")
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
@Table(name="FT_EMP")
@DiscriminatorValue("2")
class FullTimeEmployee extends Employee {
private long salary;
private long pension;

public long getPension() {
return pension;
}

public void setPension(long pension) {
this.pension = pension;
}

public long getSalary() {
return salary;
}

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



== Inheritance Type TABLE_PER_CLASS ==

File: Helper.java



<source lang="java">
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.Statement;
public class Helper {
public static void checkData() throws Exception {
Class.forName("org.hsqldb.jdbcDriver");
Connection conn = DriverManager.getConnection("jdbc:hsqldb:data/tutorial", "sa", "");
Statement st = conn.createStatement();
ResultSet mrs = conn.getMetaData().getTables(null, null, null, new String[] { "TABLE" });
while (mrs.next()) {
String tableName = mrs.getString(3);
System.out.println("\n\n\n\nTable Name: "+ tableName);
ResultSet rs = st.executeQuery("select * from " + tableName);
ResultSetMetaData metadata = rs.getMetaData();
while (rs.next()) {
System.out.println(" Row:");
for (int i = 0; i < metadata.getColumnCount(); i++) {
System.out.println(" Column Name: "+ metadata.getColumnLabel(i + 1)+ ", ");
System.out.println(" Column Type: "+ metadata.getColumnTypeName(i + 1)+ ": ");
Object value = rs.getObject(i + 1);
System.out.println(" Column Value: "+value+"\n");
}
}
}
}
}</source>



== Mark Abstract Entity With Inheritance ==

File: Employee.java



<source lang="java">
import java.util.Date;
import javax.persistence.Column;
import javax.persistence.DiscriminatorColumn;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Inheritance;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
@Entity
@Table(name="EMP")
@Inheritance
@DiscriminatorColumn(name="EMP_TYPE")
public abstract class Employee {
@Id private int id;
private String name;
@Temporal(TemporalType.DATE)
@Column(name="S_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();
}
}
@Entity
class ContractEmployee extends Employee {
@Column(name="D_RATE")
private int dailyRate;
private int term;

public int getDailyRate() {
return dailyRate;
}

public void setDailyRate(int dailyRate) {
this.dailyRate = dailyRate;
}

public int getTerm() {
return term;
}

public void setTerm(int term) {
this.term = term;
}
public String toString() {
return "ContractEmployee id: " + getId() + " name: " + getName();
}
}</source>



== Mark Discriminator Column For Entities In Hierarchy ==

File: Employee.java



<source lang="java">
import java.util.Date;
import javax.persistence.Column;
import javax.persistence.DiscriminatorColumn;
import javax.persistence.DiscriminatorValue;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Inheritance;
import javax.persistence.MappedSuperclass;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
@Entity
@Table(name = "EMP")
@Inheritance
@DiscriminatorColumn(name = "EMP_TYPE")
public abstract class Employee {
@Id
private int id;
private String name;
@Temporal(TemporalType.DATE)
@Column(name = "S_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 AbstractEmployee extends Employee {
private int vacation;
public int getVacation() {
return vacation;
}
public void setVacation(int vacation) {
this.vacation = vacation;
}
}
@Entity
@DiscriminatorValue("FTEmp")
class FullTimeEmployee extends AbstractEmployee {
private long salary;
private long pension;
public long getPension() {
return pension;
}
public void setPension(long pension) {
this.pension = pension;
}
public long getSalary() {
return salary;
}
public void setSalary(long salary) {
this.salary = salary;
}
public String toString() {
return "FullTimeEmployee id: " + getId() + " name: " + getName();
}
}
@Entity(name = "PTEmp")
@DiscriminatorValue("PTEmp")
class PartTimeEmployee extends AbstractEmployee {
@Column(name = "H_RATE")
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();
}
}</source>



== Persist subclass ==

File: Employee.java



<source lang="java">
import java.util.Date;
import javax.persistence.Column;
import javax.persistence.DiscriminatorColumn;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Inheritance;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
@Entity
@Table(name="EMP")
@Inheritance
@DiscriminatorColumn(name="EMP_TYPE")
public abstract class Employee {
@Id private int id;
private String name;
@Temporal(TemporalType.DATE)
@Column(name="S_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();
}
}
@Entity
class ContractEmployee extends Employee {
@Column(name="D_RATE")
private int dailyRate;
private int term;

public int getDailyRate() {
return dailyRate;
}

public void setDailyRate(int dailyRate) {
this.dailyRate = dailyRate;
}

public int getTerm() {
return term;
}

public void setTerm(int term) {
this.term = term;
}
public String toString() {
return "ContractEmployee id: " + getId() + " name: " + getName();
}
}</source>



== Set Discriminator Value In Subclass ==

File: Employee.java



<source lang="java">
import java.util.Date;
import javax.persistence.Column;
import javax.persistence.DiscriminatorColumn;
import javax.persistence.DiscriminatorType;
import javax.persistence.DiscriminatorValue;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Inheritance;
import javax.persistence.InheritanceType;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
@Entity
@Table(name="EMP")
@Inheritance(strategy=InheritanceType.JOINED)
@DiscriminatorColumn(name="EMP_TYPE", discriminatorType=DiscriminatorType.INTEGER)
public abstract class Employee {
@Id private int id;
private String name;
@Temporal(TemporalType.DATE)
@Column(name="S_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();
}
}

@Entity
@Table(name="PT_EMP")
@DiscriminatorValue("3")
class PartTimeEmployee extends Employee {
@Column(name="H_RATE")
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
@Table(name="FT_EMP")
@DiscriminatorValue("2")
class FullTimeEmployee extends Employee {
private long salary;
private long pension;

public long getPension() {
return pension;
}

public void setPension(long pension) {
this.pension = pension;
}

public long getSalary() {
return salary;
}

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



== Three Leve Entity Hierarchy ==

File: Employee.java



<source lang="java">
import java.util.Date;
import javax.persistence.Column;
import javax.persistence.DiscriminatorColumn;
import javax.persistence.DiscriminatorValue;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Inheritance;
import javax.persistence.MappedSuperclass;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
@Entity
@Table(name = "EMP")
@Inheritance
@DiscriminatorColumn(name = "EMP_TYPE")
public abstract class Employee {
@Id
private int id;
private String name;
@Temporal(TemporalType.DATE)
@Column(name = "S_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 AbstractEmployee extends Employee {
private int vacation;
public int getVacation() {
return vacation;
}
public void setVacation(int vacation) {
this.vacation = vacation;
}
}
@Entity
@DiscriminatorValue("FTEmp")
class FullTimeEmployee extends AbstractEmployee {
private long salary;
private long pension;
public long getPension() {
return pension;
}
public void setPension(long pension) {
this.pension = pension;
}
public long getSalary() {
return salary;
}
public void setSalary(long salary) {
this.salary = salary;
}
public String toString() {
return "FullTimeEmployee id: " + getId() + " name: " + getName();
}
}
@Entity(name = "PTEmp")
@DiscriminatorValue("PTEmp")
class PartTimeEmployee extends AbstractEmployee {
@Column(name = "H_RATE")
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();
}
}</source>

Java Tutorial/JPA/Inheritance - История изменений

Admin: 1 версия

в 17:44, 31 мая 2010

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