Programmatically setting derby.system.home

问题

Need to move the database and log files of JavaDB (derby) db files into deployment directories. The database is working in the application startup directory as JavaDB creates a folder with the name of the database (in my case mydb), but I want to move that dir into a subdir called data/ creating data/mydb. I can do this with the connect call:

DriverManager.getConnection("jdbc:derby:data/mydb;create=false");

and this works. But I'd like to programmatically explicitly set the value of

derby.system.home=data/
derby.stream.error.file=log/derby.log

So I can do:

DriverManager.getConnection("jdbc:derby:mydb;create=false");

and all dbs would be in that data/ dir. And the derby log file would be in logs/! I just can't seem to figure this out. Anyone help? Is there a way to set those properties programatically (because it's embedded)?

回答1:

The documentation (Derby developers guide: Setting Derby properties) suggests something like:

Properties p = System.getProperties();
p.setProperty("derby.system.home", "C:\databases\sample");

I've also seen

/* setting an attribute in a Properties object */
Properties myProps = new Properties();
myProps.put("create", "true");
Connection conn = DriverManager.getConnection("jdbc:derby:sampleDB", myProps);

来源：https://stackoverflow.com/questions/3810198/programmatically-setting-derby-system-home