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 void testBetweenClause() throws Exception {
        DataSource d = ds.executeSQL(
                "select * from persona where id between 0 and 2;");
        d.start();
        Value v0 = ValueFactory.createValue(1);
        Value v1 = ValueFactory.createValue("huracan");
        Value v2 = ValueFactory.createValue("gonsales");
        assertTrue(d.getRowCount() == 1);
        assertTrue(((BooleanValue) d.getFieldValue(0, 0).equals(v0)).getValue());
        assertTrue(((BooleanValue) d.getFieldValue(0, 1).equals(v1)).getValue());
        assertTrue(((BooleanValue) d.getFieldValue(0, 2).equals(v2)).getValue());
        d.stop();


        d = ds.executeSQL("select * from persona where id not between 0 and 2;");
        d.start();
        v0 = ValueFactory.createValue(0);
        v1 = ValueFactory.createValue("fernando");
        v2 = ValueFactory.createValue("gonzalez");
        Value v3 = ValueFactory.createValue(2);
        Value v4 = ValueFactory.createValue("fernan");
        assertTrue(d.getRowCount() == 2);
        assertTrue(((BooleanValue) d.getFieldValue(0, 0).equals(v0)).getValue());
        assertTrue(((BooleanValue) d.getFieldValue(0, 1).equals(v1)).getValue());
        assertTrue(((BooleanValue) d.getFieldValue(0, 2).equals(v2)).getValue());
        assertTrue(((BooleanValue) d.getFieldValue(1, 0).equals(v3)).getValue());

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    public void testInClause() throws Exception {
        DataSource d = ds.executeSQL(
                "select * from persona where id in (0, 2);");
        
        d.start();
        Value v0 = ValueFactory.createValue(0);
        Value v1 = ValueFactory.createValue("fernando");
        Value v2 = ValueFactory.createValue("gonzalez");
        Value v3 = ValueFactory.createValue(2);
        Value v4 = ValueFactory.createValue("fernan");
        assertTrue(d.getRowCount() == 2);
        assertTrue(((BooleanValue) d.getFieldValue(0, 0).equals(v0)).getValue());
        assertTrue(((BooleanValue) d.getFieldValue(0, 1).equals(v1)).getValue());
        assertTrue(((BooleanValue) d.getFieldValue(0, 2).equals(v2)).getValue());
        assertTrue(((BooleanValue) d.getFieldValue(1, 0).equals(v3)).getValue());

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   */
  public Value evaluate(long row) throws EvaluationException {
    Expression c = (Expression) getChilds()[0];


    try {
      Value value = c.evaluateExpression(row);


      if (not) {
        ((BooleanValue) value).setValue(!((BooleanValue) value).getValue());
      }

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


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

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  public byte[] getBinary(long row, String fieldName) throws DriverException {
    return getBinary(row, getFieldIndexByName(fieldName));
  }


  public byte[] getBinary(long row, int fieldId) throws DriverException {
    Value v = getFieldValue(row, fieldId);
    if (v instanceof NullValue) {
      return null;
    } else {
      return ((BinaryValue) v).getValue();
    }

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


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

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


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

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   *
   * @throws SemanticException Si se produce un error sem�ntico
   * @throws DriverException Si se produce un error de I/O
   */
  public Value evaluate(long row) throws EvaluationException {
    Value ret = null;


    Adapter[] expr = (Adapter[]) getChilds();


    if (expr.length > 0) {
      ret = ((Expression) expr[0]).evaluateExpression(row);


      if (expr.length == 2) {
        try {
            if (getOperator(this.getEntity()) == PRODUCTO) {
                        ret = ret.producto(((Expression) expr[1]).evaluateExpression(
                              row));
          } else if (getOperator(this.getEntity()) == DIVISION) {
            ret = ret.producto(((Expression) expr[1]).evaluateExpression(
                  row).inversa());
          }
                } catch (IncompatibleTypesException e) {
                    throw new EvaluationException(e);
                }

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


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

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


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

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