An approach to MySQL dynamic cross-reference query

I’m using Redmine to manage projects and bug reports, I was needing a daily report with spent time by user on each project, nothing complicated, but I wanted a cross-reference result like Excel dynamic tables. As we know, MySQL doesn’t support dynamic cross-reference queries but I make an approach:

1. Write the main query with rows: project identifier, task subject and total hours in a date range.

SELECT p.identifier, 
	e.issue_id, i.subject, round(SUM(e.hours),2) AS total_hours
	FROM redmine_nsp.time_entries e
	INNER JOIN redmine_nsp.issues i ON e.issue_id = i.id
	INNER JOIN redmine_nsp.projects p ON e.project_id = p.id
	WHERE e.spent_on BETWEEN '2014-07-01' AND '2014-07-07'
 GROUP BY p.identifier,e.issue_id;
+------------+----------+----------------------------+-------------+
| identifier | issue_id | subject                    | total_hours |
+------------+----------+----------------------------+-------------+
| bg02       |     3223 | Gestion de proyecto        |        0.25 |
| bg04       |     3256 | 1.1 Preparación del entor  |        0.63 |
| emision    |     3251 | Desarrollar la aplicación  |        3.97 |
| nsp00      |     3236 | Preparar propuesta para G  |        2.02 |
| nsp02      |     3234 | Subida al servidor de pro  |        0.52 |
| nsp02      |     3240 | Agregar funcionalidad de   |        0.55 |
| nsp02      |     3241 | Revertir el Documento      |        2.80 |
| nsp02      |     3242 | Agregar Filtros en las vi  |        0.72 |
| nsp02      |     3243 | Reportes de Cargo de entr  |        2.35 |
| nsp02      |     3254 | Control de sesiones        |        3.23 |
| nsp05      |     3252 | Mantenimiento del servido  |        0.18 |
| nsp05      |     3253 | Mantenimiento a redmine    |        0.53 |
| nsp06      |     3203 | Elaborar el visualzador d  |        0.23 |
| nsp06      |     3228 | Evitar que se tome mas de  |        0.25 |
| nsp06      |     3255 | Actualizar el porcentaje   |        1.50 |
| nsp08      |     3239 | Asistencia remota          |        1.38 |
+------------+----------+----------------------------+-------------+

2. Then list the active users between dates:

SELECT e.user_id, u.login
FROM redmine_nsp.time_entries e
	INNER JOIN redmine_nsp.users u ON e.user_id = u.id 
WHERE e.spent_on BETWEEN '2014-07-01' AND '2014-07-07'
GROUP BY e.user_id;
+---------+----------+
| user_id | login    |
+---------+----------+
|       1 | user1    |
|       4 | user2    |
|       5 | user3    |
|       6 | user4    |
+---------+----------+

3. Now, create a stored procedure to create a dynamic SQL command with the second query as column names and values with each Redmine issue. The second query is used as cursor.

DELIMITER $$
 
CREATE PROCEDURE `get_range_summary`(dDate1 DATE,dDate2 DATE)
BEGIN
 
DECLARE done INT DEFAULT 0;
DECLARE p_user_id INT;
DECLARE p_sql text;
DECLARE p_login VARCHAR(255);
DECLARE c_users cursor FOR
	SELECT e.user_id, u.login
	FROM redmine_nsp.time_entries e
		INNER JOIN redmine_nsp.users u ON e.user_id = u.id 
	WHERE e.spent_on BETWEEN  dDate1 AND dDate2 
	GROUP BY e.user_id;
DECLARE CONTINUE HANDLER FOR SQLSTATE '02000' SET done = 1;
 
SET p_sql = 'select s.codigo,s.issue_id,s.subject ';
OPEN c_users;
 
read_loop: LOOP
	FETCH c_users INTO p_user_id, p_login;
    IF done THEN
      LEAVE read_loop;
    END IF;
	SET p_sql = concat(p_sql,
      ', (select round(sum(t.hours),2) as total
		from redmine_nsp.time_entries t
		where t.spent_on between \'',dDate1,'\' and \'',dDate2,'\'  
        and t.issue_id = s.issue_id
		and t.user_id = ',p_user_id,') as `',p_login,'` ');
 
END LOOP;
 
SET @SQL = concat(p_sql,' ,s.total_hours from 
	(select p.identifier, e.issue_id, i.subject, 
         round(sum(e.hours),2) as total_hours
	from redmine_nsp.time_entries e
	inner join redmine_nsp.issues i on e.issue_id = i.id
	inner join redmine_nsp.projects p on e.project_id = p.id
	where e.spent_on between \'',dDate1,'\' and \'',dDate2,'\' group by p.identifier,e.issue_id) as s');
 
 
close c_users;
 
PREPARE stmt1 FROM @SQL;
EXECUTE stmt1;
DEALLOCATE PREPARE stmt1; 
 
END

The result of call get_range_summary(‘2014-07-01′,’2014-07-07′):

+---------+----------+----------------------------+-------+--------+---------+----------+-------------+
| identif | issue_id | subject                    | user1 | user2  |  user3  |   user4  | total_hours |
+---------+----------+----------------------------+-------+--------+---------+----------+-------------+
| bg02    |       23 | Gestion de proyecto        |  NULL |   0.25 |    NULL |     NULL |        0.25 |
| bg04    |       56 | 1.1 Preparación del entor  |  NULL |   0.63 |    NULL |     NULL |        0.63 |
| emision |       51 | Desarrollar la aplicación  |  NULL |   NULL |    3.97 |     NULL |        3.97 |
| nsp00   |       36 | Preparar propuesta para G  |  NULL |   2.02 |    NULL |     NULL |        2.02 |
| nsp02   |       34 | Subida al servidor de pro  |  NULL |   0.52 |    NULL |     NULL |        0.52 |
| nsp02   |       40 | Agregar funcionalidad de   |  NULL |   NULL |    0.55 |     NULL |        0.55 |
| nsp02   |       41 | Revertir el Documento      |  1.40 |   NULL |    1.40 |     NULL |        2.80 |
| nsp02   |       42 | Agregar Filtros en las vi  |  NULL |   NULL |    0.72 |     NULL |        0.72 |
| nsp02   |       43 | Reportes de Cargo de entr  |  NULL |   NULL |    NULL |     2.35 |        2.35 |
| nsp02   |       54 | Control de sesiones        |  NULL |   NULL |    NULL |     3.23 |        3.23 |
| nsp05   |       52 | Mantenimiento del servidor |  NULL |   0.18 |    NULL |     NULL |        0.18 |
| nsp05   |       53 | Mantenimiento a redmine    |  NULL |   0.53 |    NULL |     NULL |        0.53 |
| nsp06   |        3 | Elaborar el visualzador de |  NULL |   0.23 |    NULL |     NULL |        0.23 |
| nsp06   |       28 | Evitar que se tome mas de  |  NULL |   0.25 |    NULL |     NULL |        0.25 |
| nsp06   |       55 | Actualizar el porcentaje d |  NULL |   1.50 |    NULL |     NULL |        1.50 |
| nsp08   |       39 | Asistencia remota          |  NULL |   1.38 |    NULL |     NULL |        1.38 |
+---------+----------+----------------------------+-------+--------+---------+----------+-------------+

That’s it. I put the result easily in a php based report and added it to cron task.

Leave a Reply

Your email address will not be published. Required fields are marked *

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong> <pre lang="" line="" escaped="" cssfile="">

Go back to top