Revision as of 17:12, 26 February 2010 view source imported>Hendrik Brummermann →Extending a provided DAO ← Older edit		Revision as of 17:25, 26 February 2010 view source imported>Hendrik Brummermann No edit summary Newer edit →
Line 40: Note: In the register call the first parameter is the parent class you want to replace. == ~~Updating~~Adding ~~the~~support for another database ~~structure~~system == Marauroa tries to stick closely to the SQL standard. It is, however, not possible to write SQL statements that work on all common database systems because each database system has its own dialect. Luckily there are only minor differences. For example MySQL requires "create table" statements to end in "TYPE=InnoDB". Marauroa uses an interface [http://stendhal.game-host.org/hudson/job/marauroa_HEAD/javadoc/marauroa/server/db/adapter/DatabaseAdapter.html DatabaseAdapter] to hide those differences. There is already a default implementation provided for this interface called [http://stendhal.game-host.org/hudson/job/marauroa_HEAD/javadoc/marauroa/server/db/adapter/AbstractDatabaseAdapter.html AbstractDatabaseAdapter] ([http://arianne.cvs.sf.net/viewvc/arianne/marauroa/src/marauroa/server/db/adapter/AbstractDatabaseAdapter.java?view=markup source]). And we provide a MySQLDatabaseAdapter ([http://arianne.cvs.sf.net/viewvc/arianne/marauroa/src/marauroa/server/db/adapter/MySQLDatabaseAdapter.java?view=markup source]) and a H2DatabaseAdapter ([http://arianne.cvs.sf.net/viewvc/arianne/marauroa/src/marauroa/server/db/adapter/H2DatabaseAdapter.java?view=markup source]), too. Just have a look at those java files. It should be very easy to add more adapters for other database systems. Note: We are very interested in accepting those adapters and adding them to the main code base. ~~{{TODO\|Clean this up:~~ == Updating the database structure == JDBC technology is an API that lets you access virtually any tabular data source from the Java programming language. It provides cross-DBMS connectivity to a wide range of relational databases. Unfortunatally it does not hide vendor specific stuff. Marauroa and Stendhal currently only work with MySQL because of that. Adding support for other database software would be very easy as the database specific code is concentrated in the classes JDBCDatabase (Marauroa) and StendhalPlayerDatabase (Stendhal). We have no need for that, so it was not done, yet. We will, however, accept patches for multi database system support, so if you need it, go ahead. ~~You need to download MySQL Connector/J in order to get it to run: http://www.mysql.com/downloads/api-jdbc-stable.html~~ ~~To configure Marauroa to work with a JDBC source, run the appropriate GenerateINI program. For Stendhal this is games.stendhal.server.core.engine.GenerateINI.~~ ~~Before using the application with the database, you need to create the database itself. So, with MySQL just run MySQL and enter:~~ ~~<pre>~~ ~~create database stendhal;~~ ~~grant all on stendhal.* to stendhal_user@localhost identified by 'stendhal_passwd';~~ ~~</pre>~~ ~~The rest of code is handled by the server itself, and it will create the tables if they don't exist.~~ }}

Low Level Database Access: Difference between revisions