[英]SQL 'INSERT' is inserting the value multiple times instead of only one
大家好,我正在制作一個類似的系統,該系統發送給喜歡它和喜歡內容的數據庫。 但是事實證明,SQL INSERT語句的工作量超出了應做的……本來應該與用戶account_id
保存一行,而喜歡的內容就是screenshot_id
。 但是,它多次插入相同的值,如下所示:
id | account_id | screenshot_id
1。| ......... 2 ......... | ......... 15 ...........
2。| ......... 2 ......... | ......... 15 ...........
3。| ......... 2 ......... | ......... 15 ...........
4。| ......... 2 ......... | ......... 15 ...........
這只是一個示例,這是我在php中使用的實際代碼:
<?php
include('connect.php');
$acc_id = $_POST['acc_id']; //value = 2
$id = $_POST['id']; //value = 15
if($id && $acc_id != 0){
$count = mysqli_num_rows(mysqli_query($connect, "SELECT `id` FROM `screenshot_votes` WHERE `account_id` = '$acc_id' AND `screenshot_id` = '$id';"));
if($count == 0){ //checking if there is already a vote with those values
mysqli_query($connect, "INSERT INTO `screenshot_votes` (id,account_id,screenshot_id,vote) VALUES (NULL,'$acc_id','$id','2');");
//values being insert above
}
$row = mysqli_num_rows(mysqli_query($connect, "SELECT `vote` FROM `screenshot_votes` WHERE `screenshot_id` = $id AND `vote` = 2;"));
echo $row;
}
?>
因此,如何使此代碼僅將值插入一次,如下所示:
id | account_id | screenshot_id
1。| ......... 2 ......... | ......... 15 ...........
更新
這是滑塊jquery插件中的onclick事件:
j=function(){
var acc_id = r.accid;
e.each(o,function(t,n){
var r=e(n).children("img:first-child").attr("views");
r||(r=e(n).children("a").find("img:first-child").attr("views"));
o.on("click",".vote",function(e){
var id = $(this).attr('id');
var name = $(this).attr('name');
var dataString = 'id=' + id;
if(name == 'up'){
$('.pos_value.id'+id).fadeIn(100).html('...');
$.ajax({
type: 'POST',
url: 'pages/scripts/up_vote.php',
data: {id: id, acc_id: acc_id},
cache: false,
success: function(html){
$('.pos_value.id'+id).html(html);
$('.vote.pos_vote_enabled.img'+id).css({"background-image": "url(images/icons/pos.png)"});
$('.vote.pos_vote_enabled.img'+id).attr('class', 'pos_vote');
$('.vote.neg_vote_enabled.img'+id).attr('class', 'neg_vote');
}
});
}else{
$('.neg_value.id'+id).fadeIn(100).html('...');
$.ajax({
type: 'POST',
url: 'pages/scripts/down_vote.php',
data: {id: id, acc_id: acc_id},
cache: false,
success: function(html){
$('.neg_value.id'+id).html(html);
$('.vote.neg_vote_enabled.img'+id).css({"background-image": "url(images/icons/neg.png)"});
$('.vote.neg_vote_enabled.img'+id).attr('class', 'neg_vote');
$('.vote.pos_vote_enabled.img'+id).attr('class', 'pos_vote');
}
});
}
return false;
});
if(r){
r=e('<span class="bjqs-views">'+r+'</span>');
r.appendTo(e(n))
}
})
}
所以...我不確定腳本的其余部分是否正確,但是我在Google上搜索了更多答案,並發現了unbind()
,它對我有用,並加入了onclick函數:
o.unbind().on("click",".vote",function(e){
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