datavaluefactoryimpl.java

derby database source code.good for you.

                {
                        return new SQLDouble();
                }
                else
                {
                        dataValue.setToNull();
                        return dataValue;
                }
        }

        public BooleanDataValue getNullBoolean(BooleanDataValue dataValue)
        {
                if (dataValue == null)
                {
                        return new SQLBoolean();
                }
                else
                {
                        dataValue.setToNull();
                        return dataValue;
                }
        }

        public BitDataValue             getNullBit(BitDataValue dataValue) throws StandardException
        {
                if (dataValue == null)
                {
                        return getBitDataValue((byte[]) null);
                }
                else
                {
                        dataValue.setToNull();
                        return dataValue;
                }
        }


        public BitDataValue             getNullVarbit(BitDataValue dataValue) throws StandardException
        {
                if (dataValue == null)
                {
                        return getVarbitDataValue((byte[]) null);
                }
                else
                {
                        dataValue.setToNull();
                        return dataValue;
                }
        }

        // LONGVARBIT
        public BitDataValue getNullLongVarbit(BitDataValue dataValue) throws StandardException
        {
                if (dataValue == null)
                {
                        return getLongVarbitDataValue((byte[]) null);
                }
                else
                {
                        dataValue.setToNull();
                        return dataValue;
                }
        }

        /// BLOB
        public BitDataValue getNullBlob(BitDataValue dataValue) throws StandardException
        {
                if (dataValue == null)
                {
                        return getBlobDataValue((byte[]) null);
                }
                else
                {
                        dataValue.setToNull();
                        return dataValue;
                }
        }

        // CHAR
        public StringDataValue          getNullChar(StringDataValue dataValue)
        {
                if (dataValue == null)
                {
                        return getCharDataValue((String) null);
                }
                else
                {
                        dataValue.setToNull();
                        return dataValue;
                }
        }

        public StringDataValue          getNullVarchar(StringDataValue dataValue)
        {
                if (dataValue == null)
                {
                        return getVarcharDataValue((String) null);
                }
                else
                {
                        dataValue.setToNull();
                        return dataValue;
                }
        }

        public StringDataValue          getNullLongvarchar(StringDataValue dataValue)
        {
                if (dataValue == null)
                {
                        return getLongvarcharDataValue((String) null);
                }
                else
                {
                        dataValue.setToNull();
                        return dataValue;
                }
        }

        public StringDataValue          getNullClob(StringDataValue dataValue)
        {
                if (dataValue == null)
                {
                        return getClobDataValue((String) null);
                }
                else
                {
                        dataValue.setToNull();
                        return dataValue;
                }
        }

        public StringDataValue          getNullNationalChar(StringDataValue dataValue)
        {
                if (dataValue == null)
                {
                        return getNationalCharDataValue((String) null);
                }
                else
                {
                        dataValue.setToNull();
                        return dataValue;
                }
        }

        public StringDataValue          getNullNationalVarchar(StringDataValue dataValue)
        {
                if (dataValue == null)
                {
                        return getNationalVarcharDataValue((String) null);
                }
                else
                {
                        dataValue.setToNull();
                        return dataValue;
                }
        }

        public StringDataValue          getNullNationalLongvarchar(StringDataValue dataValue)
        {
                if (dataValue == null)
                {
                        return getNationalLongvarcharDataValue((String) null);
                }
                else
                {
                        dataValue.setToNull();
                        return dataValue;
                }
        }

        public StringDataValue          getNullNClob(StringDataValue dataValue)
        {
                if (dataValue == null)
                {
                        return getNClobDataValue((String) null);
                }
                else
                {
                        dataValue.setToNull();
                        return dataValue;
                }
        }

        public UserDataValue            getNullObject(UserDataValue dataValue)
        {
                if (dataValue == null)
                {
                        return getDataValue((Object) null);
                }
                else
                {
                        dataValue.setToNull();
                        return dataValue;
                }
        }

        public RefDataValue             getNullRef(RefDataValue dataValue)
        {
                if (dataValue == null)
                {
                        return getDataValue((RowLocation) null);
                }
                else
                {
                        dataValue.setToNull();
                        return dataValue;
                }
        }

        public DateTimeDataValue        getNullDate(DateTimeDataValue dataValue)
        {
                if (dataValue == null)
                {
                    try
                    {
                        return getDataValue((Date) null);
                    }
                    catch( StandardException se)
                    {
                        if( SanityManager.DEBUG)
                        {
                            SanityManager.THROWASSERT( "Could not get a null date.", se);
                        }
                        return null;
                    }
                }
                else
                {
                        dataValue.setToNull();
                        return dataValue;
                }
        }

        public DateTimeDataValue        getNullTime(DateTimeDataValue dataValue)
        {
                if (dataValue == null)
                {
                    try
                    {
                        return getDataValue((Time) null);
                    }
                    catch( StandardException se)
                    {
                        if( SanityManager.DEBUG)
                        {
                            SanityManager.THROWASSERT( "Could not get a null time.", se);
                        }
                        return null;
                    }
                }
                else
                {
                        dataValue.setToNull();
                        return dataValue;
                }
        }

        public DateTimeDataValue        getNullTimestamp(DateTimeDataValue dataValue)
        {
                if (dataValue == null)
                {
                    try
                    {
                        return getDataValue((Timestamp) null);
                    }
                    catch( StandardException se)
                    {
                        if( SanityManager.DEBUG)
                        {
                            SanityManager.THROWASSERT( "Could not get a null timestamp.", se);
                        }
                        return null;
                    }
                }
                else
                {
                        dataValue.setToNull();
                        return dataValue;
                }
        }

    public DateTimeDataValue getDateValue( String dateStr, boolean isJdbcEscape) throws StandardException
    {
        return new SQLDate( dateStr, isJdbcEscape, getLocaleFinder());
    } // end of getDateValue( String dateStr)

    public DateTimeDataValue getTimeValue( String timeStr, boolean isJdbcEscape) throws StandardException
    {
        return new SQLTime( timeStr, isJdbcEscape, getLocaleFinder());
    } // end of getTimeValue( String timeStr)

    public DateTimeDataValue getTimestampValue( String timestampStr, boolean isJdbcEscape) throws StandardException
    {
        return new SQLTimestamp( timestampStr, isJdbcEscape, getLocaleFinder());
    } // end of getTimestampValue( String timestampStr)


    /**
     * getXMLDataValue:
     * Get a SQL null value with XML type.
     * @return An XMLDataValue instance corresponding to a
     *  a NULL value.
     */
    public XMLDataValue getXMLDataValue()
    {
        return new XML();
    }

    /**
     * getXMLDataValue:
     * Get a null XML  value.  If a non-null XMLDataValue is
     * received then re-use that instance, otherwise create
	 * a new one.
     * @param previous An XMLDataValue instance to re-use.
     * @return An XMLDataValue instance corresponding to a
     *  NULL value.  If an XMLDataValue was received, the
     *  returned XMLDataValue is the same instance as the one
     *  received, but the actual data has been set to a
     *  SQL null value.
     * @exception StandardException Thrown on error
     */
    public XMLDataValue getXMLDataValue(XMLDataValue previous)
		throws StandardException
    {
		return getNullXML(previous);
    }

    /**
     * getNullXML:
     * Get an XML with a SQL null value. If the supplied value is
     * null then get a new value, otherwise set it to null and return 
     * that value.
     * @param dataValue An XMLDataValue instance to re-use.
     * @return An XMLDataValue instance corresponding to a
     *  NULL value.  If an XMLDataValue was received, the
     *  returned XMLDataValue is the same instance as the one
     *  received, but the actual data has been set to null.
     */
    public XMLDataValue getNullXML(XMLDataValue dataValue)
    {
        if (dataValue == null)
            return getXMLDataValue();
        else {
            dataValue.setToNull();
            return dataValue;
        }
    }

        // RESOLVE: This is here to find the LocaleFinder (i.e. the Database)
        // on first access. This is necessary because the Monitor can't find
        // the Database at boot time, because the Database is not done booting.
        // See LanguageConnectionFactory.
        private LocaleFinder getLocaleFinder()
        {
                if (localeFinder == null)
                {
                        DatabaseContext dc = (DatabaseContext) ContextService.getContext(DatabaseContext.CONTEXT_ID);
                        if( dc != null)
                            localeFinder = dc.getDatabase();
                }

                return localeFinder;
        }
}