PHP MySQL changing select query based on variables -


i've got 4 variables (year, month, projectcode , type).

so if person submits year , leave other 3 variables blank select query must select * table year(trandate) = $var
if user supplies year & month query must select * table year(trandate) = $var , month(trandate) = $var1

if user selects year, month & projectcode , leave type blank query must select * table year(trandate) = $var , month(trandate) = $var1 , projcode = $var3

and on. how go programming this, otherwhise have awful lot of combinations?

hope question clear.

for example have far can see there combinations:

if (empty($ej1year) && empty($ej1month) && empty($ej1proj) && empty($ej1type)) { $rows = mysql_query("select a.employee ,a.trandate ,concat(a.workdone, '-', wc.briefdescription) workcodeactivity ,concat(a.custname, '-', cl.shortname) clientdet ,a.qty ,a.rate ,a.amount ,a.ref ,a.projcode ,a.type ,a.qty*a.rate costrate transaction left join workcodes wc on a.workdone=wc.workcodeno left join clients cl on a.custname=cl.entityno"); } elseif (empty($ej1year) && !empty($ej1month)) { $rows = mysql_query("select a.employee ,a.trandate ,concat(a.workdone, '-', wc.briefdescription) workcodeactivity ,concat(a.custname, '-', cl.shortname) clientdet ,a.qty ,a.rate ,a.amount ,a.ref ,a.projcode ,a.type ,a.qty*a.rate costrate transaction left join workcodes wc on a.workdone=wc.workcodeno left join clients cl on a.custname=cl.entityno month(trandate) = '$ej1month'");  } elseif

something should work:

<?php $where = array(); $binds = array();  if ($_post['month'] !== '') {     $where[] = 'month = ?';     $binds[] = $_post['month']; } if ($_post['year'] !== '') {     $where[] = 'year = ?';     $binds[] = $_post['year']; } ...  $query = 'select * table ' . implode(' , ', $where); $db->execute($query, $binds);

you'd want add check see if variables set. if don't mind if empty, can change

$where = array();

to

$where = array(1);

which end "where 1" in query, selecting everything.

edit: see using mysql_ functions, that's not ideal they deprecated. should update pdo or mysqli asap. here's version work mysql_

<?php $where = array();  if ($_post['month'] !== '') {     $where[] = "month = '" . mysql_real_escape_string($_post['month'])  . "'"; } if ($_post['year'] !== '') {     $where[] = "year = '" . mysql_real_escape_string($_post['year'])  . "'"; } ...  $query = 'select * table ' . implode(' , ', $where); $result = mysql_query($query);

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