org.apache.velocity.example

Class DBContext

java.lang.Object

org.apache.velocity.context.AbstractContext

org.apache.velocity.example.DBContext

All Implemented Interfaces:

Context, InternalEventContext

public class DBContext
extends AbstractContext

Example context impl that uses a database to store stuff :) yes, this is silly expects a mysql db test with table CREATE TABLE contextstore ( k varchar(100), val blob ); very fragile, crappy code.... just a demo!

Version:

$Id: DBContext.java 1780734 2017-01-28 19:21:08Z cbrisson $

Author:

Geir Magnusson Jr.

Constructor Summary

Constructors

Constructor and Description
DBContext()
DBContext(Context inner)

Method Summary

Modifier and Type	Method and Description
boolean	internalContainsKey(String key) Not implementing.
Object	internalGet(String key) retrieves a serialized object from the db and returns the living instance to the caller.
String[]	internalGetKeys() Not implementing.
Object	internalPut(String key, Object value) Serializes and stores an object in the database.
Object	internalRemove(String key) Not implementing.

Methods inherited from class org.apache.velocity.context.AbstractContext

containsKey, get, getChainedContext, getKeys, put, remove

Methods inherited from class java.lang.Object

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

Constructor Detail

DBContext

public DBContext()

DBContext

public DBContext(Context inner)

Method Detail

internalGet

public Object internalGet(String key)

retrieves a serialized object from the db and returns the living instance to the caller.

Specified by:

internalGet in class AbstractContext

internalPut

public Object internalPut(String key,
                          Object value)

Serializes and stores an object in the database. This is really a hokey way to do it, and will cause problems. The right way is to use a prepared statement...

Specified by:

internalPut in class AbstractContext

internalContainsKey

public boolean internalContainsKey(String key)

Not implementing. Not required for Velocity core operation, so not bothering. As we say above : "very fragile, crappy code..."

Specified by:

internalContainsKey in class AbstractContext

internalGetKeys

public String[] internalGetKeys()

Not implementing. Not required for Velocity core operation, so not bothering. As we say above : "very fragile, crappy code..."

Specified by:

internalGetKeys in class AbstractContext

internalRemove

public Object internalRemove(String key)

Not implementing. Not required for Velocity core operation, so not bothering. As we say above : "very fragile, crappy code..."

Specified by:

internalRemove in class AbstractContext