这个脚本昨天运行正常，但是今天，因为我最初选择的表中有大约150,000条记录，所以它说我从null（）获取失败了。据我所知，因为我的记录太多了。
所以，我最后通过在初始查询（1000）和这一行添加限制来纠正它：
$MysqlConn->setAttribute(PDO::MYSQL_ATTR_USE_BUFFERED_QUERY, false);
这是我运行脚本的前15次左右，但现在它失败了，没有插入。我从buffered_query获取错误是假的，它可以在另一个正在进行时运行缓冲查询。
我以前从未使用过这个，更不用说得到这个错误了。我确信我的代码可以针对此进行优化（在使用PDO时我也非常环保）。
也许有人可以提供一些见解：
$MysqlConn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$MysqlConn->setAttribute(PDO::MYSQL_ATTR_USE_BUFFERED_QUERY, false);
/*Delete records that were made placements more than 5 days ago*/
$deleteOld = '
DELETE
FROM Order_status
WHERE date_updated < current_date() - INTERVAL 5 DAY';
try{
$delete = $MysqlConn->prepare($deleteOld);
$result = $delete->execute();
$count = $delete->rowcount();
echo "Records Deleted: " . $count . "\n";
}
catch(PDOException $ex)
{
echo "QUERY FAILED!: " .$ex->getMessage();
}
/*Placement process for orders already marked as Shipped*/
//PDO statement to select from order_status
$ordStatSql = 'SELECT order_id, order_status, is_placement, date_updated
FROM order_status
WHERE order_status = "S"
AND date_updated IS NULL
order by order_id desc
LIMIT 1000';
try{
$ordStat = $MysqlConn->prepare($ordStatSql);
$result = $ordStat->execute();
}
catch(PDOException $ex)
{
echo "QUERY FAILED!: " .$ex->getMessage();
}
$order_ids = [];
while ($row = $ordStat->fetch(PDO::FETCH_ASSOC)) {
$order_ids[] = $row['order_id'];
}
if (count($order_ids) > 0) {
$placeholders = implode(',', array_fill(0, count($order_ids), '?'));
$detailStatCheck = "
SELECT
invnoc as INVOICE,
fstatc as STATUS,
cstnoc AS DEALER,
framec AS FRAME,
covr1c AS COVER,
colr1c AS COLOR ,
extd2d AS SHIPDATE,
orqtyc AS QUANTITY
FROM GPORPCFL
WHERE invnoc IN ($placeholders)
";
try {
$detailCheck = $DB2conn->prepare($detailStatCheck);
$detailRslt = $detailCheck->execute($order_ids);
$count2 = $detailCheck->fetch();
print_r($order_ids);
print_r($count2);
} catch(PDOException $ex) {
echo "QUERY FAILED!: " .$ex->getMessage();
}
//Create prepared INSERT statement
$insertPlacement = "
INSERT ignore INTO placements_new (sku_id, group_id, dealer_id, start_date, expire_date, locations, order_num)
SELECT
id,
sku_group_id,
:DEALER,
DATE_ADD(DATE_FORMAT(CONVERT(:SHIPDATE, CHAR(20)), '%Y-%m-%d'),INTERVAL 7 DAY) as start_date,
DATE_ADD(DATE_FORMAT(CONVERT(:SHIPDATE, CHAR(20)), '%Y-%m-%d'),INTERVAL 127 DAY) as expire_date,
:QUANTITY,
:INVOICE
FROM skus s
WHERE s.frame=:FRAME AND s.cover1=:COVER AND s.color1=:COLOR
";
//create update statement for necessary constraints
$updatePlacement = "
UPDATE placements_new
SET expire_date = DATE_ADD(DATE_FORMAT(CONVERT(current_date(), CHAR(20)), '%Y-%m-%d'),INTERVAL 127 DAY)
";
//perpare query to check for existing records that are expired
$expiredCheck = "
SELECT
sku_id,
dealer_id,
expire_date
FROM placements_new p
INNER JOIN skus s
ON p.sku_id = s.id
WHERE p.dealer_id = :DEALER
AND s.frame = :FRAME
AND s.cover1 = :COVER
AND s.color1 = :COLOR
AND p.order_num = :INVOICE
AND p.expire_date <= current_date()
";
//perpare query to check for existing records that are expired
$validCheck = "
SELECT
sku_id,
dealer_id,
expire_date
FROM placements_new p
INNER JOIN skus s
ON p.sku_id = s.id
WHERE p.dealer_id = :DEALER
AND s.frame = :FRAME
AND s.cover1 = :COVER
AND s.color1 = :COLOR
AND p.order_num = :INVOICE
AND p.expire_date > current_date()
";
$updateShipped = '
UPDATE order_status S
INNER JOIN placements_new N
ON S.order_id = N.order_num
set S.date_updated = current_date();
';
while ($row2 = $detailCheck->fetch(PDO::FETCH_ASSOC)) {
$values = [
":DEALER" => $row2["DEALER"],
":SHIPDATE" => $row2["SHIPDATE"],
":QUANTITY" => $row2["QUANTITY"],
":INVOICE" => $row2["INVOICE"],
":FRAME" => $row2["FRAME"],
":COVER" => $row2["COVER"],
":COLOR" => $row2["COLOR"],
];
$values2 = [
":DEALER" => $row2["DEALER"],
":FRAME" => $row2["FRAME"],
":COVER" => $row2["COVER"],
":COLOR" => $row2["COLOR"],
":INVOICE" => $row2["INVOICE"],
];
try{
//Array will contain records that are expired
$checkExisting = $MysqlConn->prepare($expiredCheck);
$existingRslt = $checkExisting->execute($values2);
$count3 = $checkExisting->fetch(PDO::FETCH_ASSOC);
//Array will contain records that are valid
$checkExistingValid = $MysqlConn->prepare($validCheck);
$existingVldRslt = $checkExistingValid->execute($values2);
$count4 = $checkExistingValid->fetch(PDO::FETCH_ASSOC);
//print_r($count3);
}catch(PDOException $ex){
echo "QUERY FAILED!!!: " . $ex->getMessage();
}
// IF records do not exist, or records exist and today is after expiration date
if(empty($count3) && empty($count4)){
for($i=0; $i<$row2["QUANTITY"]; $i++) {
try{
$insert = $MysqlConn->prepare($insertPlacement);
$insertRslt = $insert->execute($values);
}catch(PDOException $ex){
echo "QUERY FAILED!!!: " . $ex->getMessage();
}
}
}elseif(!empty($count3)){
for($i=0; $i<$row2['QUANTITY']; $i++){
try{
$insert = $MysqlConn->prepare($insertPlacement);
$insertRslt = $insert->execute($values);
}catch(PDOException $ex){
echo "QUERY FAILED!!!: " . $ex->getMessage();
}
}
}elseif(!empty($count4)){
for($i=0; $i<$row2['QUANTITY']; $i++){
try{
$update = $MysqlConn->prepare($updatePlacement);
$updateRslt = $update->execute($values);
}catch(PDOException $ex){
echo "QUERY FAILED!!!: " . $ex->getMessage();
}
}
}else{
die("No action taken");
}
}
try{
$updateStatus = $MysqlConn->prepare($updateShipped);
$statUpdateRslt = $updateStatus->execute();
$count = $updateStatus->rowcount();
}
catch(PDOException $ex)
{
echo "QUERY FAILED!: " .$ex->getMessage();
}
echo "Records Updated: " . $count . "\n";
}
答案 0 :(得分：2)
当您使用无缓冲的查询时，这意味着您的结果集将从MySQL服务器流入。因此，（无缓冲的）查询运行的连接很忙，直到您读取查询的最后一行。在您的情况下，连接是$MysqlConn。
（一个缓冲的查询将整个结果集融入你的php程序的RAM并释放连接。当整个结果集不适合RAM时，你使用无缓冲的查询。）
完成后，应明确关闭未缓冲的查询。所以add a closeCursor() call。像这样。
while ($row = $ordStat->fetch(PDO::FETCH_ASSOC)) {
$order_ids[] = $row['order_id'];
}
$ordStat->closeCursor();
关闭缓冲查询也没有坏处。这是一个好习惯。