org.opencastproject.util.persistence

Class Table<R extends Table<R>>

java.lang.Object

org.opencastproject.util.persistence.Table<R>

public abstract class Table<R extends Table<R>>
extends Object

Type safe access of a database table.

Usage

Extend this class and describe the columns as public final fields in their order of selection.

   public class Person extends Table<Person> {
     // definition order is crucial and must match the order in which fields are selected
     public final Col<String> name = stringCol();
     public final Col<Date> age = date();

     public Person(Object[] row) {
       super(row);
       // necessary call to init();
       init();
     }
   }

   // usage

   // (SELECT name, age FROM Person;)
   // ATTENTION! SELECT age, name FROM Person; does NOT work!
   final Object[] select = sqlSelect();
   final MyTable t = new MyTable(select);
   final String name = t.get(t.name);
   final Date age = t.get(t.age);
 

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected class	Table.Col<A>

Constructor Summary

Constructors

Constructor and Description
Table(Object[] row)

Method Summary

Modifier and Type	Method and Description
Table.Col<Boolean>	booleanCol() Define a column of type boolean.
Table.Col<Date>	dateCol() Define a column of type Date.
Table.Col<org.joda.time.DateTime>	dateTimeCol() Define a column of type DateTime.
<A> A	get(Table.Col<A> col) Access a column.
protected void	init() Call this in the subclass's constructor!
Table.Col<Long>	longCol() Define a column of type long.
Table.Col<String>	stringCol() Define a column of type String.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Table

public Table(Object[] row)

Method Detail

stringCol

public Table.Col<String> stringCol()

Define a column of type String.

dateTimeCol

public Table.Col<org.joda.time.DateTime> dateTimeCol()

Define a column of type DateTime. DateTime columns must be mappable to Date by JPA.

dateCol

public Table.Col<Date> dateCol()

Define a column of type Date.

booleanCol

public Table.Col<Boolean> booleanCol()

Define a column of type boolean.

longCol

public Table.Col<Long> longCol()

Define a column of type long.

init

protected void init()

Call this in the subclass's constructor!

A call to init() can't happen in the abstract class's constructor since field definitions haven't been initialized yet.

get

public <A> A get(Table.Col<A> col)

Access a column.