com.j_spaces.core.client.view
Class View

java.lang.Object
  com.j_spaces.core.client.SQLQuery
      com.j_spaces.core.client.ContinousQuery
          com.j_spaces.core.client.view.View

All Implemented Interfaces:

Query, Serializable, Entry

public class View
extends ContinousQuery

TODO add Javadoc

Since:

5.2

See Also:

Serialized Form

Field Summary

Fields inherited from class com.j_spaces.core.client.SQLQuery

CALL, COUNT_PREFIX, DELETE_PREFIX, GROUP, ORDER, SELECT_PREFIX

Constructor Summary

View()
Empty constructor.

View(Entry entry, String sqlQuery)
Constructor for setting the entry as a template to query with the sql query expression.

View(Object object, String sqlQuery)
Constructor for setting the object as a template to query with the sql query expression.

View(String className, String sqlQuery)
Constructor for setting the className of the entry to query with the sql query expression.

Method Summary

Methods inherited from class com.j_spaces.core.client.SQLQuery

getClassName, getEntry, getObject, getQuery, hasWhereClause, isExternalEntry, isNullExpression, isStoredProcedure, setClassName, setExternalEntry, setQuery, setTemplate, setTemplate, toString

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

View

public View()

Empty constructor.

View

public View(String className,
            String sqlQuery)

Constructor for setting the className of the entry to query with the sql query expression.

Parameters:

className - - Entry class name to be queried.

sqlQuery - - The SQL Query expression (contents of the WHERE part).

Usage example:

 SQLQuery query = new SQLQuery(MyEntry.class.getName(), "m_integer > 50");
 Entry result[] = space.readMultiple(query, null, Integer.MAX_VALUE);
 System.out.println("Found " + result.length + " Entries");
 for (int i = 0; i < result.length; i++) {
     System.out.println(i + " " + (MyEntry) result[i]);
 }
 

Note that a single read/take operation will return only the first match, if any.

View

public View(Object object,
            String sqlQuery)

Constructor for setting the object as a template to query with the sql query expression. The constructor behaves in a similar manner to the former, but incase of an ExternalEntry its class name is extracted implicitly.

Parameters:

object - - The POJO to query by

sqlQuery - - The SQL Query expression (contents of the WHERE part).

Usage Example:

 //let MyEntry extend ExternalEntry
 SQLQuery query = new SQLQuery(MyEntry(), "m_integer > 50");
 MyEntry result = (MyEntry)space.read(query, null, JavaSpace.NO_WAIT);
 if (result!=null)
     // if there are more then one, it will return the first entry found
     System.out.println("Found entry: " + result.toString());
 else
     System.out.println("None of the entries match the specified query: "+query);
 

See Also:

SQLQuery.SQLQuery(String className, String sqlQuery)

View

public View(Entry entry,
            String sqlQuery)

Constructor for setting the entry as a template to query with the sql query expression. The constructor behaves in a similar manner to the former, but incase of an ExternalEntry its class name is extracted implicitly.

Parameters:

entry - - The entry to query by

sqlQuery - - The SQL Query expression (contents of the WHERE part).

Usage Example:

 //let MyEntry extend ExternalEntry
 SQLQuery query = new SQLQuery(MyEntry(), "m_integer > 50");
 MyEntry result = (MyEntry)space.read(query, null, JavaSpace.NO_WAIT);
 if (result!=null)
     // if there are more then one, it will return the first entry found
     System.out.println("Found entry: " + result.toString());
 else
     System.out.println("None of the entries match the specified query: "+query);
 

See Also:

SQLQuery.SQLQuery(String className, String sqlQuery)