Пример #1
0
  /**
   * static method testing jdbc framework with multiple updates and intentional sql exceptions that
   * are trapped in appropriate exception handling blocks
   */
  public static void testMultipleUpdatesAndTransWithException() {
    ConnectionPool conPool = getConnectionPool();
    SQLExecutor sqlExec = new SQLExecutor(conPool);
    try {
      sqlExec.setAutoCommit(false);
      sqlExec.addParam(new Integer(7));
      sqlExec.runQuery("UPDATE JDBC_TEST SET CODE = 'Z' WHERE TEST_ID = ?");

      sqlExec.addParam(new Integer(6));
      // integrity constraint violation
      sqlExec.runQuery("UPDATE JDBC_TEST SET TEST_ID = NULL WHERE TEST_ID = ?");

      sqlExec.commitTrans();
      System.out.println("transaction committed");
    } catch (DatabaseException e) {
      System.out.println("Error code=" + e.getSQLErrorCode() + ",  SQLState=" + e.getSQLState());
      if (e.isDataIntegrityViolation()) System.out.println("data integrity violation");
      else if (e.isBadSQLGrammar()) System.out.println("bad SQL grammar");
      else if (e.isNonExistentTableOrViewOrCol()) System.out.println("Non existent table or view");
      System.out.println(e.getMessage());
      sqlExec.rollbackTrans();
      System.out.println("transaction rolled back");
    } finally {
      sqlExec.closeConnection();
    }
  }
Пример #2
0
  /**
   * static method testing jdbc framework with a select for update statement (that locks a record)
   * and an update statement that generates a deadlock.
   */
  public static void testDeadlockException() {
    ConnectionPool conPool = getConnectionPool();
    SQLExecutor sqlExec1 = new SQLExecutor(conPool);
    try {
      // lock record with a select for update statement
      sqlExec1.setAutoCommit(false);
      sqlExec1.addParam(new Integer(2));
      sqlExec1.runQuery("SELECT CODE FROM JDBC_TEST WHERE TEST_ID = ? FOR UPDATE");

      System.out.println("Attempting to update a record locked by another connection...");
      SQLExecutor sqlExec2 = new SQLExecutor(getConnectionPool());
      sqlExec2.setTimeoutInSec(5); // timeout if deadlocked
      sqlExec2.addParam(new Integer(2));
      sqlExec2.runQueryCloseCon("UPDATE JDBC_TEST SET CODE = 'X' WHERE TEST_ID = ?");
    } catch (DatabaseException e) {
      System.out.println("Error code=" + e.getSQLErrorCode() + ", " + e.getMessage());
      if (e.isRowlockOrTimedOut()) System.out.println("Rowlock exception!");
    } finally {
      conPool.closeAllConnections();
    }
  }