Question

我在php中进行搜索功能时遇到问题。我正在尝试更改要搜索的列，使用和html下拉框。它也应该使用占位符（％？％），以便我可以进行全局搜索。当我用字母＆＃39; b＆＃39;搜索任何内容时，它只显示所有记录（所有记录，当它只显示带有字母＆＃39; b＆＃39;的记录时）。

代码如下：

HTML（请注意，这不是一个已编辑的版本，问题似乎在PHP文件中）：

    <html lang="en" class=" js csstransforms3d csstransitions">
        <head>
    <script>
    function showUser() {

    var querycolumn = document.getElementById('querycolumn').value;

    var query = document.getElementById('query').value;

      if (window.XMLHttpRequest) {
        // code for IE7+, Firefox, Chrome, Opera, Safari
        xmlhttp=new XMLHttpRequest();
      } else { // code for IE6, IE5
        xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
      }
      xmlhttp.onreadystatechange=function() {
        if (xmlhttp.readyState==4 && xmlhttp.status==200) {
          document.getElementById("txtHint").innerHTML=xmlhttp.responseText;
        }
      }
      xmlhttp.open("GET","contactsearching.php?querycolumn="+querycolumn+"&query="+query,true);
      xmlhttp.send();
    }
    </script>
    <script>
    function userdata(str) {
      if (str=="") {
        document.getElementById("userdetail").innerHTML="";
        return;
      } 
      if (window.XMLHttpRequest) {
        // code for IE7+, Firefox, Chrome, Opera, Safari
        xmlhttp=new XMLHttpRequest();
      } else { // code for IE6, IE5
        xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
      }
      xmlhttp.onreadystatechange=function() {
        if (xmlhttp.readyState==4 && xmlhttp.status==200) {
          document.getElementById("userdetail").innerHTML=xmlhttp.responseText;
        }
      }
      xmlhttp.open("GET","searchingforcontact.php?q="+str,true);
      xmlhttp.send();
    }
    </script>
        </head>
        <body>
<section class="flexform" style="display:inline-block;">

<div id="txtHint" style="padding-left:30px;padding-top:10px; padding-bottom:20px;"><b>The Contacts Which Are In The Contact Group Chosen Shall Be Displayed Here:</b></div>
                    <form>
                    <label style="clear:both;"><strong>Searching Parameter:</strong></label>
                    <select name="querycolumn" id="querycolumn" style="float:left;">
                    <option value="" selected disabled>Please Choose A Parameter To Search By</option>
                    <option value="CustomerID">Customer ID</option>
                    <option value="CustomerBusinessName">Business Name</option>
                    <option value="ContactPerson">Contact Person</option>
                    <option value="Department">Department</option>
                    <option value="OccupationalTitle">Occupational Title</option>
                    <option value="EmailAddress">Email Address</option>
                    <option value="PhoneNumber">Phone Number</option>
                    <option value="EXT">EXT</option>
                    <option value="FaxNumber">Fax Number</option>
                    <option value="BusinessAddress">Business Address</option>
                    <option value="BusinessCity">Business City</option>
                    <option value="BusinessState">Business State</option>
                    <option value="BusinessZipCode">Business Zip Code</option>
                    <option value="BusinessCountry">Business Country</option>
                    <option value="PostalAddress">Postal Address</option>
                    <option value="PostalCity">Postal City</option>
<option value="Comment">Comment</option>
</select>
<br></br>
                    <label style="clear:both;"><strong>Value Searching For:</strong></label><input type="text" name="query" style="float:left;" id="query" />
                    <input type="button" onclick='showUser()' value="Initiate Searching Sequence" style="float:left;"/>
<br></br>
                    </form>

                </section>
</body></html>

PHP文件：

<?php
$querycolumn = $_GET['querycolumn'];
$query = $_GET['query'];

$con=mysqli_connect("localhost","user","password","my_db");

// Check connection

if (mysqli_connect_errno()) {

  echo "Failed to connect to MySQL: " . mysqli_connect_error();

}

echo "<table border='4'>
<tr>
<th>Customer ID</th>
<th>Customer Business Name</th>
<th>Contact Person</th>
<th>Department</th>
<th>Phone Number</th>
<th>Email Address</th>
<th>Comment</th>
</tr>";

$stmt=$con->prepare("SELECT CustomerID, CustomerBusinessName, ContactPerson, Department, PhoneNumber, EmailAddress, Comment FROM  `Contacts` WHERE ? LIKE CONCAT('%',?,'%')");
$stmt->bind_param("ss", $querycolumn, $query);
$stmt->execute();
$stmt->bind_result($col1, $col2, $col3, $col4, $col5, $col6, $col7);

while ($stmt->fetch()) {
        printf ("<tr> \n <td><a href onclick='userdata($col1)'>$col1</a></td> \n <td><a href='#' onclick='userdata($col1)'>$col2</a></td> \n <td><a href='#' onclick='userdata($col1)'>$col3</a></td> \n <td><a href='#' onclick='userdata($col1)'>$col4</a></td> \n <td><a href='#' onclick='userdata($col1)'>$col5</a></td> \n <td><a href='#' onclick='userdata($col1)'>$col6</a></td> <td><a href='#' onclick='userdata($col1)'>$col7</a></td> \n \n </tr>", $col1, $col1, $col1, $col2, $col1, $col3, $col1, $col4, $col1, $col5, $col1, $col6, $col1, $col7);
    }

?>

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Answer 1

＆＃34;非常感谢！它正在工作。把它作为答案，我将其选为最佳！：d＆＃34;

根据要求：

您无法执行此操作WHERE ?

为列指定变量或选择实际的列名称。

MySQL并不知道如何向前看＆＃34;。

I.e。：

$column = "column_name";
WHERE $column LIKE CONCAT('%',?,'%')")

或

WHERE column_name LIKE CONCAT('%',?,'%')")

使用php从mysql中搜索数据

1 个答案: