Java Tutorial/JPA/Calendar Date

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Date Mapped To Timestamp By Default

File: Student.java



import java.util.Date;
import javax.persistence.Basic;
import javax.persistence.Entity;
import javax.persistence.Id;
@Entity
public class Student {
  @Id
  private long id = System.currentTimeMillis();
  @Basic
  private String name;
  @Basic
  private Date dateOfBirth = new Date();
  public Date getDateOfBirth() {
    return dateOfBirth;
  }
  public void setDateOfBirth(Date dateOfBirth) {
    this.dateOfBirth = dateOfBirth;
  }
  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;
  }
  
  
}





Java Calendar Mapped To Date

File: Helper.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");
        }
      }
    }
  }
}





Map Java Calendar To Timestamp

File: Student.java



import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
@Entity
public class Student {
  @Id
  private String id;
  private String name;
  @Temporal(TemporalType.TIMESTAMP)
  private java.util.Calendar dob;
  
  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 java.util.Calendar getDob() {
    return dob;
  }
  public void setDob(java.util.Calendar dob) {
    this.dob = dob;
  }
  public String toString() {
    return "\n\nID:" + id + "\nName:" + name + "\n\n"+"Dob"+dob;
  }
}





Map Java Date To Date

File: Student.java



import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
@Entity
public class Student {
  @Id
  private String id;
  private String name;
  @Temporal(TemporalType.DATE)
  private java.util.Date dob;
  
  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 java.util.Date getDob() {
    return dob;
  }
  public void setDob(java.util.Date dob) {
    this.dob = dob;
  }
  public String toString() {
    return "\n\nID:" + id + "\nName:" + name + "\n\n"+"Dob"+dob;
  }
}





Map Java Date To Time

File: Student.java



import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
@Entity
public class Student {
  @Id
  private String id;
  private String name;
  @Temporal(TemporalType.TIME)
  private java.util.Date dob;
  
  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 java.util.Date getDob() {
    return dob;
  }
  public void setDob(java.util.Date dob) {
    this.dob = dob;
  }
  public String toString() {
    return "\n\nID:" + id + "\nName:" + name + "\n\n"+"Dob"+dob;
  }
}





Map Java Date To Timestamp

File: Student.java



import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
@Entity
public class Student {
  @Id
  private String id;
  private String name;
  @Temporal(TemporalType.TIMESTAMP)
  private java.util.Date dob;
  
  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 java.util.Date getDob() {
    return dob;
  }
  public void setDob(java.util.Date dob) {
    this.dob = dob;
  }
  public String toString() {
    return "\n\nID:" + id + "\nName:" + name + "\n\n"+"Dob"+dob;
  }
}





Mark Java Calendar With Temporal Type Date

File: Student.java



import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
@Entity
public class Student {
  @Id
  private String id;
  private String name;
  @Temporal(TemporalType.DATE)
  private java.util.Calendar dob;
  
  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 java.util.Calendar getDob() {
    return dob;
  }
  public void setDob(java.util.Calendar dob) {
    this.dob = dob;
  }
  public String toString() {
    return "\n\nID:" + id + "\nName:" + name + "\n\n"+"Dob"+dob;
  }
}





Temporal Type DATE

File: Student.java



import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
@Entity
public class Student {
  @Id
  private String id;
  private String name;
  @Temporal(TemporalType.DATE)
  private java.util.Calendar dob;
  
  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 java.util.Calendar getDob() {
    return dob;
  }
  public void setDob(java.util.Calendar dob) {
    this.dob = dob;
  }
  public String toString() {
    return "\n\nID:" + id + "\nName:" + name + "\n\n"+"Dob"+dob;
  }
}





Temporal Type TIMESTAMP

File: Student.java



import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
@Entity
public class Student {
  @Id
  private String id;
  private String name;
  @Temporal(TemporalType.TIMESTAMP)
  private java.util.Calendar dob;
  
  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 java.util.Calendar getDob() {
    return dob;
  }
  public void setDob(java.util.Calendar dob) {
    this.dob = dob;
  }
  public String toString() {
    return "\n\nID:" + id + "\nName:" + name + "\n\n"+"Dob"+dob;
  }
}


Источник — «http://jexp.ru/index.php?title=Java_Tutorial/JPA/Calendar_Date&oldid=5170»