cmu.survey.data
Class TableVersionStorage

java.lang.Object
  cmu.survey.data.TableVersionStorage

public class TableVersionStorage
extends java.lang.Object

Check what version of the table is in the database before upgrading to a new one. So, if the table would actually be going backwards in version, you won't down-grade it, but just give the user an error message saying they're using a too-old version of the program and it needs to be upgraded.

Constructor Summary

TableVersionStorage(TableStorage tableStorage)

Method Summary

java.lang.Integer	getVersion(java.lang.String tableName)
boolean	setVersion(java.lang.String tableName, int version) Set the cached version of this table in the database.

Methods inherited from class java.lang.Object

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

Constructor Detail

TableVersionStorage

public TableVersionStorage(TableStorage tableStorage)

Method Detail

getVersion

public java.lang.Integer getVersion(java.lang.String tableName)

setVersion

public boolean setVersion(java.lang.String tableName,
                          int version)

Set the cached version of this table in the database. This version number does not necessarily mean that all data is upgraded in the table -- it just means that SOME of the data is specifically upgraded for this version. For example, if the table version in the database is 1, and one column is needed for access by version 2, it will create that one column and set the version to 2. This doesn't mean everything has been created, it just means that some of it has been created. Only the necessary bits get upgraded as they're needed, thus you're more likely to be able to use the database with an old version of the editor. Upgrading bit by bit is also more efficient, since we don't need to search the entire table or check to see whether we're using the latest version every time we access the table.

Parameters:

tableName -

version -

Returns: