예제 #1
0
  /**
   * ** Returns true if the parent records in their respective parent tables exist. ** @return True
   * if the parent records exist.
   */
  public boolean parentsExist() throws DBException {
    DBFactory<gDBR> dbFact = this.getFactory();
    DBFieldValues myFldVals = this.getFieldValues();
    java.util.List<String> parentList = dbFact.getParentTables();
    for (String parentTable : parentList) {

      /* get parent table DBFactory */
      Print.logInfo("[%s] Parent table: %s", this.getTableName(), parentTable);
      DBFactory parentFact = DBFactory.getFactoryByName(parentTable);
      if (parentFact == null) {
        Print.logError("Unexpected error finding parent table: " + parentTable);
        return false;
      }

      /* create parent record key with fields from this key */
      DBRecordKey parentKey = parentFact.createKey(); // an empty key
      DBField parentKeyFlds[] = parentFact.getKeyFields();
      for (DBField pkf : parentKeyFlds) {
        String pfn = pkf.getName();

        /* get this DBField */
        DBField myKeyFld = this.getField(pfn);
        if (myKeyFld == null) {
          Print.logError("Unexpected error finding field: [" + this.getTableName() + "] " + pfn);
          return false;
        }

        /* get parent key field value */
        Object pkv = myFldVals.getFieldValue(pfn);
        if (pkv == null) {
          Print.logError("Unexpected error finding parent field: [" + parentTable + "] " + pfn);
          return false;
        }
        if (myKeyFld.isDefaultValue(pkv)) {
          Print.logInfo("This key contains a global value, skipping parent check: " + parentTable);
          parentKey = null;
          break;
        }
        parentKey.setFieldValue(pfn, pkv);
      }

      /* check parent existence */
      if ((parentKey != null) && !parentKey.exists()) {
        Print.logError("Parent record does not exist: [" + parentTable + "] " + parentKey);
        return false;
      }
    }
    return true;
  }
예제 #2
0
  /**
   * ** Returns true if the specified key attribute exists in the table ** @param altIndexName The
   * alternate index name, or null to use the primary index ** @param whereKeyType The partial key
   * match type ** @return True if the specified key attribute exists in the table, false otherwise
   */
  protected boolean _exists(String altIndexName, int whereKeyType)
      throws SQLException, DBException {

    /* key fields */
    boolean usePrimaryKey = StringTools.isBlank(altIndexName);
    DBField kfld[] = usePrimaryKey ? this.getKeyFields() : this.getAltKeyFields(altIndexName);
    if (ListTools.isEmpty(kfld)) {
      throw new DBException("No keys found!");
    }

    /* check last key for "auto_increment" */
    if (whereKeyType == DBWhere.KEY_FULL) {
      DBField lastField = kfld[kfld.length - 1];
      if (lastField.isAutoIncrement()
          && !this.getFieldValues().hasFieldValue(lastField.getName())) {
        // full key requested and last key is auto_increment, which is missing
        return false;
      }
    }

    // DBSelect: SELECT <Keys> FROM <TableName> <KeyWhere>
    String firstKey = kfld[0].getName();
    DBSelect<gDBR> dsel = new DBSelect<gDBR>(this.getFactory());
    dsel.setSelectedFields(firstKey);
    dsel.setWhere(this._getWhereClause(altIndexName, whereKeyType));

    /* get keyed record */
    DBConnection dbc = null;
    Statement stmt = null;
    ResultSet rs = null;
    boolean exists = false;
    try {
      dbc = DBConnection.getDefaultConnection();
      stmt = dbc.execute(dsel.toString()); // may throw DBException
      rs = stmt.getResultSet();
      exists = rs.next();
    } catch (SQLException sqe) {
      if (sqe.getErrorCode() == DBFactory.SQLERR_TABLE_NOTLOCKED) {
        // MySQL: This case has been seen on rare occasions.  Not sure what causes it.
        Print.logError("SQL Lock Error: " + sqe);
        Print.logError("Hackery! Forcing lock on table: " + this.getTableName());
        if (DBProvider.lockTableForRead(this.getTableName(), true)) { // may throw DBException
          stmt = dbc.execute(dsel.toString()); // may throw SQLException, DBException
          rs = stmt.getResultSet(); // SQLException
          exists = rs.next(); // SQLException
          DBProvider.unlockTables(); // DBException
        }
      } else {
        throw sqe;
      }
    } finally {
      if (rs != null) {
        try {
          rs.close();
        } catch (Throwable t) {
        }
      }
      if (stmt != null) {
        try {
          stmt.close();
        } catch (Throwable t) {
        }
      }
      DBConnection.release(dbc);
    }

    return exists;
  }