Use cursor to export data to use less memory
Use cursor to export data to use less memory

<?php <?php
   
include_once("./lib/common.inc.php"); include_once("./lib/common.inc.php");
setlocale(LC_CTYPE, 'C'); setlocale(LC_CTYPE, 'C');
// source: http://stackoverflow.com/questions/81934/easy-way-to-export-a-sql-table-without-access-to-the-server-or-phpmyadmin#81951 // source: http://stackoverflow.com/questions/81934/easy-way-to-export-a-sql-table-without-access-to-the-server-or-phpmyadmin#81951
$query = $conn->prepare(' $query = $conn->prepare('
SELECT "CNID",contractnotice."agencyName",agency.abn as "agencyABN",EXTRACT(EPOCH FROM "publishDate") as "publishDate",EXTRACT(EPOCH FROM "contractStart") as "contractStart",EXTRACT(EPOCH FROM "contractEnd") as "contractEnd",value,description,"procurementMethod",category,"categoryUNSPSC", SELECT "CNID",contractnotice."agencyName",agency.abn as "agencyABN",EXTRACT(EPOCH FROM "publishDate") as "publishDate",EXTRACT(EPOCH FROM "contractStart") as "contractStart",EXTRACT(EPOCH FROM "contractEnd") as "contractEnd",value,description,"procurementMethod",category,"categoryUNSPSC",
"supplierABN","supplierName","supplierCity","supplierPostcode","supplierCountry","contactPostcode", "supplierABN","supplierName",
( (
case when "supplierABN" != 0 THEN "supplierABN"::text ELSE "supplierName" END) as supplierID, case when "supplierABN" != 0 THEN "supplierABN"::text ELSE "supplierName" END) as supplierID,
(\'https://www.tenders.gov.au/?event=public.advancedsearch.keyword&keyword=CN\'::text || "CNID"::text) as sourceURL (\'https://www.tenders.gov.au/?event=public.advancedsearch.keyword&keyword=CN\'::text || "CNID"::text) as sourceURL
FROM contractnotice join agency on contractnotice."agencyName"=agency."agencyName" where "childCN" = 0'); FROM contractnotice join agency on contractnotice."agencyName"=agency."agencyName" where "childCN" = 0'
  , array(PDO::ATTR_CURSOR => PDO::FETCH_ORI_NEXT));
  // "supplierCity","supplierPostcode","supplierCountry","contactPostcode",
// (substr( "categoryUNSPSC"::text, 0, 2 ) || \'0000000\'::text) as "categoryUNSPSClv1", "categoryUNSPSC", (substr( "categoryUNSPSC"::text, 0, 3 ) || \'000000\'::text) as "categoryUNSPSClv2" "categoryUNSPSC", (substr( "categoryUNSPSC"::text, 0, 4 ) || \'00000\'::text as "categoryUNSPSClv3") // (substr( "categoryUNSPSC"::text, 0, 2 ) || \'0000000\'::text) as "categoryUNSPSClv1", "categoryUNSPSC", (substr( "categoryUNSPSC"::text, 0, 3 ) || \'000000\'::text) as "categoryUNSPSClv2" "categoryUNSPSC", (substr( "categoryUNSPSC"::text, 0, 4 ) || \'00000\'::text as "categoryUNSPSClv3")
$query->execute(); $query->execute();
if (!$query) { if (!$query) {
databaseError($conn->errorInfo()); databaseError($conn->errorInfo());
die('Couldn\'t fetch records'); die('Couldn\'t fetch records');
} }
   
$num_fields = $query->columnCount(); $num_fields = $query->columnCount();
$headers = array(); $headers = array();
for ($i = 0; $i < $num_fields; $i++) { for ($i = 0; $i < $num_fields; $i++) {
$meta = $query->getColumnMeta($i); $meta = $query->getColumnMeta($i);
$headers[] = $meta['name']; $headers[] = $meta['name'];
} }
$fp = fopen('php://output', 'w'); $fp = fopen('php://output', 'w');
if ($fp && $query) { if ($fp && $query) {
header('Content-Type: text/csv'); header('Content-Type: text/csv');
header('Content-Disposition: attachment; filename="export.'.date("c").'.csv"'); header('Content-Disposition: attachment; filename="export.'.date("c").'.csv"');
header('Pragma: no-cache'); header('Pragma: no-cache');
header('Expires: 0'); header('Expires: 0');
fputcsv($fp, $headers); fputcsv($fp, $headers);
foreach ($query->fetchAll(PDO::FETCH_NUM) as $row) { while ($row = $query->fetch(PDO::FETCH_NUM, PDO::FETCH_ORI_NEXT)) {
foreach ($row as $key => &$colvalue) { foreach ($row as $key => &$colvalue) {
$colvalue = preg_replace( '/[^[:print:]]/', '', $colvalue = preg_replace( '/[^[:print:]]/', '',
utf8_encode($colvalue)); utf8_encode($colvalue));
if ($headers[$key] == "publishDate" || $headers[$key] == "contractStart" if ($headers[$key] == "publishDate" || $headers[$key] == "contractStart"
|| $headers[$key] == "contractEnd") { || $headers[$key] == "contractEnd") {
$colvalue = date("Y-m-d",$colvalue); $colvalue = date("Y-m-d",$colvalue);
} }
} }
fputcsv($fp, array_values($row)); fputcsv($fp, array_values($row));
} }
die; die;
} }
?> ?>