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POPHP array to SQL string using foreach loop
 

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  1. POPHP array to SQL string using foreach loop
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    <p>Okay let me start all over again.</p> <p>First we have three tables:</p> <p>Table: transaction</p> <pre><code> meter_id | bay_number | trans_date_time | amount ----------+------------+----------------------------+-------- 1078 | 5 | 2013-06-03 09:59:32+10 | 5.00 1078 | 7 | 2013-06-03 09:12:01+10 | 5.00 1078 | 6 | 2013-06-03 08:33:11+10 | 5.00 1078 | 8 | 2013-05-27 09:48:26+10 | 5.00 1078 | 5 | 2013-05-27 09:41:42+10 | 5.00 1078 | 4 | 2013-05-27 09:41:08+10 | 5.00 1078 | 7 | 2013-05-20 17:14:15+10 | 2.00 1078 | 2 | 2013-05-20 16:19:10+10 | 2.50 </code></pre> <p>Table: service</p> <pre><code> meter_id | notified_at | finished_at ----------+------------------------+------------------------ 1078 | 2013-05-30 15:02:27+10 | 2013-05-30 15:32:20+10 1078 | 2013-05-30 12:32:43+10 | 2013-05-30 14:50:14+10 1078 | 2013-05-30 08:31:27+10 | 2013-05-30 10:25:56+10 1078 | 2013-05-29 07:36:31+10 | 2013-05-29 11:35:47+10 </code></pre> <p>Table: relocated_meter</p> <pre><code> relocation_date | meter_id | bay_number | source_meter_id | source_bay_number -----------------+----------+------------+-----------------+------------------- 2013-04-24 | 1078 | 1 | 1078 | 1 2013-04-24 | 1078 | 2 | 1078 | 2 2013-04-24 | 1078 | 3 | 1078 | 3 2013-04-24 | 1078 | 4 | 1078 | 4 2013-04-24 | 1078 | 5 | 1078 | 5 2013-04-24 | 1078 | 6 | 1078 | 6 2013-04-24 | 1078 | 7 | 1078 | 7 2013-04-24 | 1078 | 8 | 1067 | 5 2013-04-24 | 1078 | 9 | 1067 | 6 </code></pre> <p>What I am trying to write is some elegant function/s inside a PHP class to generate the following:</p> <p>For each service records, what is the income received by each meter? Then, generate income for the the last 52 weeks (eg, if the meter 1078 was down from 10:00 to 10:30 this tuesday, what is the income for the same meter on last tuesday between 10:00 and 10:30 and the week before that all through 52 weeks). This is so I get an annual average for each meter during the same time period.</p> <p>Now, a few meters have inherited some bays and with the introduction of the third table called relocated_meter, I'd like to get the weekly amount PLUS income for another meter (1067 bay 5 and 1067 bay 6) because they're now part of meter 1078 bay 8 and 9, so average income should include the other bays too for dates before relocated_date</p> <p>I hope this makes sense?</p> <hr> <p> <pre><code>function getWeeks() { $meter_combo = array( array(1234 =&gt; 1), array(1234 =&gt; 2), array(1234 =&gt; 3), array(1234 =&gt; 4), ); $notified_time = '2013-05-17 12:20:48'; $completed_time = '2013-05-17 12:52:07'; $relocation_date = '2013-04-30 00:00'; $old_meter_combo = array( array(4444 =&gt; 1), array(4444 =&gt; 2), array(4444 =&gt; 8), array(4444 =&gt; 9), ); $notified_time = strtotime($notified_time); $completed_time = strtotime($completed_time); $relocation_date = date($relocation_date); $weeks = 2; $combined = array(); for($i=0;$i&lt;=$weeks;$i++) { $start_series = strtotime("- $i weeks", $notified_time); $end_series = strtotime("- $i weeks", $completed_time); if(strtotime($relocation_date) &lt; $start_series) { $combined[] = array( 'week_id' =&gt; $i, 'start_time' =&gt; date('Y-m-d H:i:s',$start_series), 'end_time' =&gt; date('Y-m-d H:i:s',$end_series), 'relocation' =&gt; $relocation_date, 'meter_id' =&gt; $meter_combo, ); } else { $combined[] = array( 'week_id' =&gt; $i, 'start_time' =&gt; date('Y-m-d H:i:s',$start_series), 'end_time' =&gt; date('Y-m-d H:i:s',$end_series), 'relocation' =&gt; $relocation_date, 'meter_id' =&gt; $old_meter_combo, ); } } $sql1 = "SUM(CASE WHEN ("; foreach($combined as $k1 =&gt; $v1) { $sql2 = "AND trans_date_time BETWEEN " . $v1['start_time'] . " AND " .$v1['end_time']. "&lt;br/&gt;" ; $sql3 = "THEN amount ELSE 0 END) AS week_" . $v1['week_id'] . "&lt;br /&gt;" ; foreach ($v1['meter_id'] as $v2) { foreach ($v2 as $meter =&gt; $bay) { $sql4[] = "meter_id = $meter and bay_number = $bay &lt;br/&gt;"; } } } $sql4 = implode(" OR ", $sql4); echo $sql1.$sql4.$sql2.$sql3; } </code></pre> <p>Any other elegant want of doing this is greatly welcomed :)</p> <p>Thanks.</p>
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    1. COI think it would be better to use: WHEN (meter_id = 1234 AND bay_number IN (1,2,3,4)
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