Use Configuration Files and Store Game Data - Learn to Program with Minecraft Plugins - page 156

Read From and Write To the Database
As far as the database knows, we're dealing with only two fields, player_name
and location_strings , which use the player_name as a key.
Looking back at LocationSnapshot , you can copy the database's load and update
functions, with the exception handling, and make two new functions here:
private void myRead( final String name) {
}
private void myWrite() {
}
In each function, set up the search HashMap , then do the Database's load or
update in a try-catch block.
Go try that now. When you're done, you should have something like this:
BackCmdSave/src/backcmdsave/SavedLocation.java
private void myRead( final String name) {
player_name = name;
HashMap < String , Object > search = new HashMap < String , Object >();
search.put( "player_name" , name);
try {
Database.get().load(this, search);
} catch (DatabaseReadException e) {
// Not necessarily an error, could be first one
}
if (location_strings == null) {
player_name = name;
location_strings = new ArrayList < String >();
}
}
private void myWrite() {
HashMap < String , Object > search = new HashMap < String , Object >();
search.put( "player_name" , player_name);
try {
Database.get().update(this, search);
} catch (DatabaseWriteException e) {
//Error, couldn't write!
System .err.println( "Update failed" );
}
}
Make sure that much compiles, using build.sh as usual.