getDoubleWhereClause.sql

/*
 * ** header v3.0
 * This file is a part of the CaosDB Project.
 *
 * Copyright (C) 2018 Research Group Biomedical Physics,
 * Max-Planck-Institute for Dynamics and Self-Organization Göttingen
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <https://www.gnu.org/licenses/>.
 *
 * ** end header
 */

DROP FUNCTION IF EXISTS db_2_0.getDoubleWhereClause;

DELIMITER //
CREATE FUNCTION db_2_0.getDoubleWhereClause(value DOUBLE, unit_sig BIGINT, valueStdUnit DECIMAL(65,30), stdUnit_sig BIGINT, o CHAR(4)) RETURNS VARCHAR(20000) DETERMINISTIC
BEGIN
    RETURN IF(unit_sig IS NULL AND value IS NOT NULL, 
        CONCAT('subdata.value ', o, ' \'', value, '\''), #-- without unit but value must not be NULL
        CONCAT(
            IF(value IS NULL, '', #-- value is NULL, but valueStdUnit might not be NULL  
                CONCAT('(subdata.unit_sig=', unit_sig, ' AND subdata.value ', o, ' \'', value, '\') OR ')), 
        	IF(unit_sig = stdUnit_sig,'',CONCAT('(subdata.unit_sig=', stdUnit_sig,' AND subdata.value ', o, ' \'', valueStdUnit, '\') OR ')),'(standard_unit(subdata.unit_sig)=', stdUnit_sig,' AND convert_unit(subdata.unit_sig,subdata.value) ', o, ' ', valueStdUnit, ')')); #-- with unit and non-null valueStdUnit
END;
//
DELIMITER ;