在foreach循环中更新表

Question

有一个问题。 只是找不到问题。 我有2个表，第一个是kampe：hold1，hold2，hold1goal，hold2goal和另一个hold：hold，fgoal，agol。 我试图将所有hold1goal和hold2goal转换为hold表中的fgoal和agoal。 我对sql很新。

<?php
include "config.php";

foreach($db->query('SELECT * FROM kampe') as $row){

        $fgoal = $row['hold1goal'];
        $agoal = $row['hold2goal'];
        $hold = $row['hold1'];

        $stmt = $db->prepare("UPDATE hold SET fgoal = :fgoal, agoal = :agoal WHERE hold = :hold");                                  
        $stmt->bindParam(':fgoal', $fgoal); 
        $stmt->bindParam(':agoal', $agoal); 
        $stmt->bindParam(':hold', $hold);   


        $stmt->execute(); 


        /*   print $agoal . "\n";

        $fgoal = $row['hold2goal'];
        $agoal = $row['hold1goal'];
        $hold = $row['hold2'];

        $stmt = $db->prepare("UPDATE hold SET fgoal = :fgoal, agoal = :agoal WHERE hold = :hold");                                  
        $stmt->bindParam(':fgoal', $fgoal); 
        $stmt->bindParam(':agoal', $agoal); 
        $stmt->bindParam(':hold', $hold);   



        $stmt->execute(); */
}
?>

这就是结果。 只有“ Odensevej”发生了变化。 以为foreach循环会改变一切。

坎佩

INSERT INTO `kampe` (`kampID`, `hold1`, `hold2`, `hold1goal`, `hold2goal`) VALUES
(1, 'marksvej', 'holdet', 0, 0),
(2, 'tervej', 'dfdf', 0, 0),
(3, 'Odensevej', 'holdet2', 2, 1),
(4, 'hest', 'hestener', 0, 0),
(5, 'holdet', 'tervej', 0, 0),
(6, 'dfdf', 'marksvej', 2, 6),
(7, 'Odensevej', 'hest', 0, 0),
(8, 'hestener', 'holdet2', 3, 1),
(9, 'dfdf', 'holdet', 0, 0),
(10, 'tervej', 'marksvej', 0, 0),
(11, 'hestener', 'Odensevej', 2, 1),
(12, 'holdet2', 'hest', 0, 0),
(13, 'Odensevej', 'holdet', 0, 0),
(14, 'dfdf', 'holdet2', 0, 0),
(15, 'hest', 'tervej', 2, 3),
(16, 'hestener', 'marksvej', 0, 0),
(17, 'holdet2', 'holdet', 0, 0),
(18, 'Odensevej', 'marksvej', 0, 0),
(19, 'hest', 'dfdf', 0, 0),
(20, 'tervej', 'hestener', 0, 0),
(21, 'hest', 'holdet', 0, 0),
(22, 'marksvej', 'holdet2', 0, 0),
(23, 'tervej', 'Odensevej', 0, 0),
(24, 'dfdf', 'hestener', 0, 0),
(25, 'holdet', 'hestener', 0, 0),
(26, 'hest', 'marksvej', 0, 0),
(27, 'tervej', 'holdet2', 0, 0),
(28, 'Odensevej', 'dfdf', 3, 2);

保持

INSERT INTO `hold` (`id`, `hold`, `leder`, `telefon`, `email`, `fgoal`, `agoal`, `p`) VALUES
(6, 'holdet', 'kim anov', '345345', 'kimanov@gmail.com', 0, 0, 0),
(20, 'marksvej', 'svend dellepude', '345345', 'kimanov@gmail.com', 0, 0, 1),
(61, 'tervej', 'Kim Test', '34343434', 'kim@anov.dk', 0, 0, 1),
(64, 'dfdf', 'dfdf', 'dfdf', 'kim@anov.dk', 0, 0, 0),
(67, 'Odensevej', 'Brian Anov', '34343434', 'brian@anov.dk', 3, 2, 2),
(69, 'holdet2', 'asda asdasd', '4234234', 'dsfsf@sdfsd.com', 0, 0, 0),
(70, 'hest', 'kim a', '323423', 'adas@asda.dk', 0, 0, 0),
(71, 'hestener', 'asdasd asdasd', '3423423423', 'safsdfasdasd.com', 0, 0, 2);

Answer 1

这并不能直接回答您有关查询结果循环为什么失败的问题，但是...没有理由为什么要在PHP中循环执行此操作。 一个查询将同时执行SELECT和UPDATE：

update hold h
left join kampe k on
    k.hold1 = h.hold
set
    fgoal = k.hold1goal,
    agoal = k.hold2goal

向组合中添加PHP循环会大大增加数据库中相对简单的UPDATE查询的开销。