我开始为基本投票系统编写代码。但是我收到了此错误消息。
警告：mysqli_query（）期望参数1为mysqli，给定布尔值 在第6行的E：\ My-WORLD \ xampp \ htdocs \ php-tut \ voting \ vote.des.php中
<?php
$con = mysqli_connect("localhost","root","","voting") || die("not
connected");
echo "connected";
if(isset($_POST['ele'])){
global $con;
$vote_ele = "update votes set ele = ele + 1";
$run = mysqli_query($con,$vote_ele);
if($run){
echo "voted to electronics";
}
else{
echo mysqli_error($run);
}
}
?>
答案 0 :(得分：0)
<div class="d-flex flex-column align-items-center h-100 customerForm">
<!-- logo -->
<div class="justify-content-center d-flex">
<div [ngx-scroll-to]="'#destination'" class="tbtn">About us</div>
<div [ngx-scroll-to]="'#howitwork'" class="tbtn">How It Works</div>
</div>
<div class="d-flex align-items-start pt-3 pr-3 pl-3">
<img src="assets/logo2.png" class="img-fluid p-3" alt="Responsive image" />
</div>
<!-- request form -->
<div class="w-100 pl-3 pr-3 d-flex justify-content-center">
<form [formGroup]="customerForm" (ngSubmit)="onSubmit()"
class="pr-3 pl-3">
<div class="example-container">
<mat-form-field class="w-100">
<input matInput placeholder="Name" formControlName="name" />
</mat-form-field>
<mat-form-field class="w-100">
<input
matInput
min="0"
max="12"
formControlName="phone"
placeholder="Phone (only 11 digits)"
value="03"
(keypress)="numberOnly($event)"
/>
</mat-form-field>
<mat-form-field class="w-100">
<input matInput placeholder="Email" formControlName="email" />
</mat-form-field>
<mat-form-field class="w-100">
<mat-select placeholder="Location" formControlName="locations">
<mat-option *ngFor="let loc of locations" [value]="loc.location">
{{ loc.location }}
</mat-option>
</mat-select>
</mat-form-field>
<!-- <mat-form-field class="w-100">
<mat-select placeholder="Service" formControlName="service">
<mat-option *ngFor="let offer of service" [value]="offer.service">{{
offer.service
}}</mat-option>
</mat-select>
</mat-form-field> -->
</div>
<mat-checkbox class="terms" formControlName="terms">
<div (click)="openBottomSheet()">
Accept our Terms & Conditions
</div>
</mat-checkbox>
<div class="d-flex justify-content-center mt-3">
<button class="btn pl-4 pr-4" [disabled]="!customerForm.valid">
You Need Help!
</button>
</div>
</form>
</div>
<!-- request form end -->
</div>
或html,
body {
min-height:100%;
height: 100%;
font-family: 'Montserrat', sans-serif;
}
.wrapper{
// background: url('../src/assets/webbg.png') bottom center no-repeat;
background-size: contain;
}
.bg{
background-position: bottom center;
background-repeat: no-repeat;
}
.tbtn{
background: #283593;
padding:20px 13px 5px;
margin: 0.5em;
border-radius: 0 0 0.4em 0.4em;
color: #ffffff;
font-size: 0.7em;
cursor: pointer;
text-align: center;
}
.btn{
color: #fff;
border: 0!important;
border-radius: 40px;
transition: all .3s ease 0s;
background: #082146!important;
font-weight: 500;
font-size: 0.9em;
}
.terms{
font-size: 0.8em;
}
.termsText p:last-child{
display: none!important;
}
.txtDelp p:last-child{
display: none!important;
}
.main{
// height: calc(100vh);
height: 100%;
}
.g-block{
background: rgba(0, 0, 0, 0.1);
height: 100%;
width: 100%;
}
.about-text{
background: url(../src/assets/bgsign.png) center center no-repeat;
background-size: contain;
}
.col-text{
flex-direction: column;
color:#0c1f44;
h3,h4{
font-size: 1.1em;
font-weight: 700;
text-transform: uppercase;
color: inherit;
}
p{
font-size: 0.9em;
}
}
.h-social .list-inline-item{
color: #082146;
font-weight: 700;
}
.footer{
align-items: center;
margin-top: 2rem;
font-size: 0.8rem;
}
均不得与任何mysqli函数关联写入。
How to properly connect with mysqli：
||鉴于此脚本不是唯一一个使用mysql连接的脚本，请将此代码存储在名为or的单独文件中，然后将其包含在其他文件中。因此，您当前的代码将变为
$host = '127.0.0.1';
$db = 'voting';
$user = 'root';
$pass = '';
$charset = 'utf8mb4';
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
try {
$con = mysqli_connect($host, $user, $pass, $db);
mysqli_set_charset($con, $charset);
} catch (\mysqli_sql_exception $e) {
throw new \mysqli_sql_exception($e->getMessage(), $e->getCode());
}
请参阅-简洁，整洁且可重复使用。
答案 1 :(得分：-2)
使用$con = mysqli_connect("localhost","root","","voting") || die("not
connected");时，您正在将bool分配给$con变量。因此不再是mysqli。
此外，当您使用global $con时，您正在覆盖$con的值，因此不再是您在上一行中分配的mysqli。
尝试一下：
$con = mysqli_connect("localhost", "root", "", "voting");
if (mysqli_connect_errno())
die("Failed to connect to MySQL: " . mysqli_connect_error());
echo "connected";
if (isset($_POST['ele'])) {
// This will override $con value!!
// global $con;
$vote_ele = "update votes set ele = ele + 1";
$run = mysqli_query($con, $vote_ele);
if ($run) {
echo "voted to electronics";
}
else {
echo mysqli_error($run);
}
}