/**
* When opening a database, the hsqldb.compatible_version property is used to determine if this
* version of the engine is equal to or greater than the earliest version of the engine capable of
* opening that database.
*
* <p>
*
* @return
* @throws SQLException
*/
boolean open() throws SQLException {
if (Trace.TRACE) {
Trace.trace();
}
if (!pProperties.checkFileExists()) {
create();
open();
// this is a new database
return true;
}
// todo: some parts are not necessary for ready-only access
pProperties.load();
sFileScript = sName + ".script";
sFileCache = sName + ".data";
sFileBackup = sName + ".backup";
scriptChecker = new File(sFileScript);
// tony_lai@users 20020820
// Allows the user to modify log size from the properties file.
iLogSize = pProperties.getIntegerProperty("hsqldb.log_size", iLogSize);
String version = pProperties.getProperty("hsqldb.compatible_version");
// fredt@users 20020428 - patch 1.7.0 by fredt
int check = version.substring(0, 5).compareTo(jdbcDriver.VERSION);
Trace.check(check <= 0, Trace.WRONG_DATABASE_FILE_VERSION);
// save the current version
pProperties.setProperty("hsqldb.version", jdbcDriver.VERSION);
if (pProperties.isPropertyTrue("readonly")) {
bReadOnly = true;
dDatabase.setReadOnly();
if (cCache != null) {
cCache.open(true);
}
reopenAllTextCaches();
runScript();
return false;
}
boolean needbackup = false;
String state = pProperties.getProperty("modified");
if (state.equals("yes-new-files")) {
renameNewToCurrent(sFileScript);
renameNewToCurrent(sFileBackup);
} else if (state.equals("yes")) {
if (isAlreadyOpen()) {
throw Trace.error(Trace.DATABASE_ALREADY_IN_USE);
}
// recovering after a crash (or forgot to close correctly)
restoreBackup();
needbackup = true;
}
pProperties.setProperty("modified", "yes");
pProperties.save();
if (cCache != null) {
cCache.open(false);
}
reopenAllTextCaches();
runScript();
if (needbackup) {
close(false);
pProperties.setProperty("modified", "yes");
pProperties.save();
if (cCache != null) {
cCache.open(false);
}
reopenAllTextCaches();
}
openScript();
// this is an existing database
return false;
}
