Examples of org.gdbms.engine.values.Value

org.gdbms.engine.values.Value
Datatypes must implement this interface in order to the drivers to return that datatype. The implementation can inherit from AbstractValue or must implement equals and hashCode in the way explained at doEquals method javadoc

  public float getFloat(long row, String fieldName) throws DriverException {
    return getFloat(row, getFieldIndexByName(fieldName));
  }


  public float getFloat(long row, int fieldId) throws DriverException {
    Value v = getFieldValue(row, fieldId);
    if (v instanceof NullValue) {
      return 0;
    } else {
      return ((FloatValue) v).getValue();
    }

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  public long getLong(long row, String fieldName) throws DriverException {
    return getLong(row, getFieldIndexByName(fieldName));
  }


  public long getLong(long row, int fieldId) throws DriverException {
    Value v = getFieldValue(row, fieldId);
    if (v instanceof NullValue) {
      return 0;
    } else {
      return ((LongValue) v).getValue();
    }

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  public short getShort(long row, String fieldName) throws DriverException {
    return getShort(row, getFieldIndexByName(fieldName));
  }


  public short getShort(long row, int fieldId) throws DriverException {
    Value v = getFieldValue(row, fieldId);
    if (v instanceof NullValue) {
      return 0;
    } else {
      return ((ShortValue) v).getValue();
    }

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  public String getString(long row, String fieldName) throws DriverException {
    return getString(row, getFieldIndexByName(fieldName));
  }


  public String getString(long row, int fieldId) throws DriverException {
    Value v = getFieldValue(row, fieldId);
    if (v instanceof NullValue) {
      return null;
    } else {
      return ((StringValue) v).getValue();
    }

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  public Timestamp getTimestamp(long row, String fieldName) throws DriverException {
    return getTimestamp(row, getFieldIndexByName(fieldName));
  }


  public Timestamp getTimestamp(long row, int fieldId) throws DriverException {
    Value v = getFieldValue(row, fieldId);
    if (v instanceof NullValue) {
      return null;
    } else {
      return ((TimestampValue) v).getValue();
    }

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  public Time getTime(long row, String fieldName) throws DriverException {
    return getTime(row, getFieldIndexByName(fieldName));
  }


  public Time getTime(long row, int fieldId) throws DriverException {
    Value v = getFieldValue(row, fieldId);
    if (v instanceof NullValue) {
      return null;
    } else {
      return ((TimeValue) v).getValue();
    }

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  public void setTime(long row, int fieldId, Time value) throws DriverException {
    setFieldValue(row, fieldId, ValueFactory.createValue(value));
  }


  public boolean isNull(long row, int fieldId) throws DriverException {
    Value v = getFieldValue(row, fieldId);
    if (v instanceof NullValue) {
      return true;
    } else {
      return false;
    }

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    /**
     * @see org.gdbms.engine.instruction.Expression#evaluate(long)
     */
    public Value evaluate(long row) throws EvaluationException {
        Value value = ((Expression)getChilds()[0]).evaluate(row);
        boolean b = value instanceof NullValue;
        if (getEntity().first_token.next.next.image.toLowerCase().equals("not")) b = !b;
        return ValueFactory.createValue(b);
    }

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      int fieldIndex = tables[0].getFieldIndexByName(fieldName);
      if (fieldIndex == -1) throw new RuntimeException("we found the field name of the expression but could not find the field index?");
    
      for (int i = 0; i < tables[0].getRowCount(); i++) {
        Value v = tables[0].getFieldValue(i, fieldIndex);
        if (v instanceof NumericValue){
          res += ((NumericValue) v).doubleValue();
        }else{
          throw new ExecutionException("SUM only operates with numeric fields");
        }

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