PHP检查是否唯一答案

【问题标题】：PHP check if uniquePHP检查是否唯一
【发布时间】：2017-01-23 09:40:20
【问题描述】：

我有这个代码可以在我的库存管理脚本中输入产品。我需要帮助。我想在我输入新产品时检查行 cod（mysql 中的 codint）是否是唯一的，如果不是唯一的，请提醒我。

like opencat 模型字段..

<?php 
require('header.php'); 
include('functii/functions.php');
if(isset($_POST[submit]) && !empty($_POST[nume])){
    $_POST[nume] = mysql_real_escape_string($_POST[nume]);
    $_POST[stoc] = mysql_real_escape_string($_POST[stoc]);
    $_POST[pretintrare] = mysql_real_escape_string($_POST[pretintrare]);
    $_POST[pretrecomandat] = mysql_real_escape_string($_POST[pretrecomandat]);
    $_POST[comentarii] = mysql_real_escape_string($_POST[comentarii]);
    $_POST[descriere] = mysql_real_escape_string($_POST[descriere]);
    $_POST[locatie] = mysql_real_escape_string($_POST[locatie]);
    $_POST[stare] = mysql_real_escape_string($_POST[stare]);
    $_POST[tip] = mysql_real_escape_string($_POST[tip]);
    $sql = "INSERT INTO stoc (nume, tip, locatie, stoc, pretintrare, pretrecomandat, stare, comentarii, descriere, model1, model2, model3, model4, model5, model6, model7, model8, model9, model10, model11, model12, model13, model14, brand, img, img2, img3, img4, codint) VALUES ('$_POST[nume]', '$_POST[tip]', '$_POST[locatie]', '$_POST[stoc]', '$_POST[pretintrare]', '$_POST[pretrecomandat]', '$_POST[stare]', '$_POST[comentarii]', '$_POST[descriere]', '$_POST[model1]', '$_POST[model2]', '$_POST[model3]', '$_POST[model4]', '$_POST[model5]', '$_POST[model6]', '$_POST[model7]', '$_POST[model8]', '$_POST[model9]', '$_POST[model10]', '$_POST[model11]', '$_POST[model12]', '$_POST[model13]', '$_POST[model14]', '$_POST[brand]', '$_POST[img]', '$_POST[img2]', '$_POST[img3]', '$_POST[img4]', '$_POST[codint]' )";
    $result=mysql_query($sql);  
    $last_id=mysql_insert_id(); 
    die('<script type="text/javascript">window.location.href="stoc-id.php?id='.$last_id.'";</script>');
}
?>  

    <ul id="nav">
        <li class="inactive"><a href="stoc.php?t=ecran">Ecrane</a></li>
        <li class="inactive"><a href="stoc.php?t=tastatura">Tastaturi</a></li>
        <li class="inactive"><a href="stoc.php?t=incarcator">Incarcatoare</a></li>
        <li class="inactive"><a href="stoc.php?t=hdd">HDD</a></li>
        <li class="inactive"><a href="stoc.php?t=placibaza">Placi de baza</a></li>
        <li class="inactive"><a href="stoc.php?t=ram">RAM</a></li>
        <li class="inactive"><a href="stoc.php?t=Cooler">Cooler</a></li>
        <li class="inactive"><a href="stoc.php?t=balamale">Balamale</a></li>
        <li class="inactive"><a href="stoc.php?t=laptop">Laptop</a></li>
        <li class="inactive"><a href="stoc.php?t=accesoriil">Accesorii Laptop</a></li>
        <li class="inactive"><a href="stoc.php?t=mufealimentare">Mufe Alimentare</a></li>
        <li class="inactive"><a href="stoc.php?t=moduleel">Module Electronice</a></li>
        <li class="inactive"><a href="stoc.php?t=carcasa">Carcasa laptop</a></li>
        <li class="inactive"><a href="stoc.php?t=dez">Dezmembrari</a></li>      
    </ul>

    <div id="content">
        <h1>Adauga un produs pe stoc:</h1>          
        <form action="stoc-adauga.php" method="post">

            <div id="tichetleft">               
                <p>Nume: <input style="margin-left: 40px;" type="text" name="nume"></p>
                <p>Cod: <input style="margin-left: 52px;" type="text" name="codint"></p>
                <p>Stoc: <input style="margin-left: 51px;" type="text" name="stoc"/></p>
                <p>Pret recom: <input style="margin-left: -1px;" type="text" name="pretintrare"/></p>               
            </div>

            <div id="tichetright">              
                <p>Locatie:
                <input style="margin-left: 33px;" type="radio" id="1" name="locatie" value="0"><label for="1">Crangasi</label>
                <input type="radio" name="locatie" id="2" value="1" checked="checked"><label for="2">Dristor</label>
                </p>
                <p style="margin-top: 27px;">Stare: 
                <input style="margin-left: 48px;" id="3" type="radio" name="stare" value="0" checked="checked"><label for="3">Nou</label>
                <input type="radio" name="stare" id="4" value="1"><label for="4">Second-Hand</label>
                </p>
                <p style="margin-top: 23px;">Pret Distributie: <input style="margin-left: 13px;width:262px;" type="text" name="pretrecomandat"/></p>
            </div>

            <div class="clear"></div>

            <div id="center">
                <p class="stoc">Tip:
                <input type="radio" id="5" name="tip" value="ecran" checked="checked"><label for="5">Ecran</label>
                <input type="radio" id="6" name="tip" value="tastatura"><label for="6">Tastatura</label>
                <input type="radio" id="7" name="tip" value="incarcator"><label for="7">Incarcator</label>
                <input type="radio" id="8" name="tip" value="hdd"><label for="8">HDD</label>
                <input type="radio" id="9" name="tip" value="placibaza"><label for="9">Placa de baza</label>
                <input type="radio" id="10" name="tip" value="ram"><label for="10">RAM</label>
                <input type="radio" id="12" name="tip" value="cooler"><label for="12">Cooler</label>
                <input type="radio" id="13" name="tip" value="balamale"><label for="13">Balamale</label>
                <input type="radio" id="11" name="tip" value="laptop"><label for="11">Laptop</label>
                <input type="radio" id="14" name="tip" value="accesoriil"><label for="14">Accesorii Laptop</label>
                <input type="radio" id="15" name="tip" value="mufealimentare"><label for="15">Mufe Alimentare</label>
                <input type="radio" id="16" name="tip" value="moduleel"><label for="16">Module Electronice</label>
                <input type="radio" id="17" name="tip" value="carcasa"><label for="17">Carcasa</label>
                <input type="radio" id="18" name="tip" value="dez"><label for="18">Dezmembrari</label>
                </p>
                <p>Note int: <textarea style="margin-left: 45px;" type="text" name="comentarii"/></textarea></p>
                <p>Descriere: <textarea style="margin-left: 45px;" type="text" name="descriere"/></textarea></p>
            </div>
            <div id="tichetleft">   
            <p>Model1: <input style="margin-left: 40px;" type="text" name="model1"></p>
            <p>Model2: <input style="margin-left: 40px;" type="text" name="model2"></p>
            <p>Model3: <input style="margin-left: 40px;" type="text" name="model3"></p>
            <p>Model4: <input style="margin-left: 40px;" type="text" name="model4"></p>
            <p>Model5: <input style="margin-left: 40px;" type="text" name="model5"></p>
            <p>Model5: <input style="margin-left: 40px;" type="text" name="model11"></p>
            <p>Model5: <input style="margin-left: 40px;" type="text" name="model12"></p>
            <p>Brand: <input style="margin-left: 40px;" type="text" name="brand"></p>
            <p>IMG3: <input style="margin-left: 40px;" type="text" name="img3"></p>
            </div>
            <div id="tichetright">
            <p>Model6: <input style="margin-left: 40px;" type="text" name="model6"></p>
            <p>Model7: <input style="margin-left: 40px;" type="text" name="model7"></p>
            <p>Model8: <input style="margin-left: 40px;" type="text" name="model8"></p>
            <p>Model9: <input style="margin-left: 40px;" type="text" name="model9"></p>
            <p>Model0: <input style="margin-left: 40px;" type="text" name="model10"></p>
            <p>Model0: <input style="margin-left: 40px;" type="text" name="model13"></p>
            <p>Model0: <input style="margin-left: 40px;" type="text" name="model14"></p>            
            <p>IMG: <input style="margin-left: 40px;" type="text" name="img"></p>
            <p>IMG2: <input style="margin-left: 40px;" type="text" name="img2"></p>
            <p>IMG4: <input style="margin-left: 40px;" type="text" name="img4"></p>
            </div>
            <div id="center">               
                <input type="submit" style="padding-left: 25px;" name="submit" value="Adauga produsul"><img style="vertical-align: -10%;margin-left:-160px;" src="imagini/produs-icon.png" alt="Adauga tichet"></input>
            </div>

        </form>

    </div> <!-- end content -->

<?php require('footer.php');?>

【问题讨论】：

每次在新代码中使用the mysql_ 数据库扩展a Kitten is strangled somewhere in the world 时，它都会被弃用，并且已经存在多年，并且在 PHP7 中永远消失了。如果您只是学习 PHP，请花精力学习 PDO 或 mysqli 数据库扩展和预处理语句。 Start here
你的脚本有SQL Injection Attack的风险看看Little Bobby Tables发生了什么甚至if you are escaping inputs, its not safe!使用prepared parameterized statements
请阅读What topics can I ask about 和How to ask a good question 和the perfect question 以及如何创建Minimal, Complete and Verifiable example SO 不是免费的编码或代码转换或调试或教程或图书馆查找服务 我们修复你的尝试，我们不编写你的代码

标签： php mysql unique-id

【解决方案1】：

要检查记录是否存在于数据库中，

您首先获取指定 coint 的计数。对于下面给出的代码。

$checkStmt=mysqli_prepare($con, "SELECT COUNT(*) FROM stoc  WHERE codint<>?");
    if( $checkStmt ) {
        $codint = mysqli_real_escape_string($con, $_POST[codint]);
        mysqli_stmt_bind_param($checkStmt,"d",$codint);
        mysqli_stmt_execute($checkStmt);
        mysqli_stmt_bind_result($checkStmt,$txt_RecordCount);
        mysqli_stmt_fetch($checkStmt);
        mysqli_stmt_close($checkStmt);
        $knownRecordCount=$txt_RecordCount;
    }
    if($txt_RecordCount>0){
        // record id existing
    }else{
    // not existing. It is a fresh recored
    }

请理解并在您的代码中实现。这将起作用。这对我来说非常有效。

【讨论】：

在插入之前你应该执行这个并且计数值为零然后插入否则执行一些其他的事情。