import simpledb.server.SimpleDB;
import simpledb.file.Block;
import simpledb.tx.Transaction;

public class TxMgrTest {
	public static void main(String[] args) throws Exception {
		SimpleDB.init("testdb");
		Transaction tx = new Transaction();

		Block blk = new Block("testfile", 0);
		tx.pin(blk);

		int ival = tx.getInt(blk, 20);
		String sval = tx.getString(blk, 40);
 		System.out.println("current value at location 20 = "
 							+ ival);
 		System.out.println("current value at location 40 = "
 							+ sval);

		tx.setInt(blk, 20, ival+1);
		tx.setString(blk, 40, sval+"1");
		tx.unpin(blk);
		tx.commit();

		Transaction tx2 = new Transaction();
		tx2.pin(blk);
 		System.out.println("new value at location 20 = "
 							+ tx2.getInt(blk, 20));
 		System.out.println("new value at location 40 = "
 							+ tx2.getString(blk, 40));
 		tx2.unpin(blk);
 		tx2.commit();
	}
}