public synchronized Command prepareCommand(String sql) {
if (closed) {
throw DbException.get(ErrorCode.CONNECTION_BROKEN_1, "session closed");
}
Command command;
if (queryCacheSize > 0) {
if (queryCache == null) {
queryCache = SmallLRUCache.newInstance(queryCacheSize);
} else {
command = queryCache.get(sql);
if (command != null && command.canReuse()) {
command.reuse();
return command;
}
}
}
Parser parser = createParser();
command = parser.prepareCommand(sql);
if (queryCache != null) {
if (command.isCacheable()) {
queryCache.put(sql, command);
}
}
return command;
}
/**
* Parse and prepare the given SQL statement.
*
* @param sql the SQL statement
* @param rightsChecked true if the rights have already been checked
* @return the prepared statement
*/
public Prepared prepare(String sql, boolean rightsChecked) {
Parser parser = createParser();
parser.setRightsChecked(rightsChecked);
return parser.prepare(sql);
}