如何基于HTML表单字段中填充的信息从sql查询中检索特定信息？

Question

我是PHP和其他所有事物的新手，所以请尽量使任何响应尽可能简单。 谢谢。 我只是想不通如何仅从填写的字段中获取信息。当我进行搜索时，它也会显示空白字段。 我只需要找到HTML表单中的信息。 例如，如果我输入了项目代码，则需要与该代码有关的所有信息。 或者，如果我输入了特定预算，则需要拥有该预算的所有内容。 我希望这是有道理的...我真是个菜鸟，我什至不知道该如何措辞！！！！！ 我试过使用！is_null，（isset）、! empty，但它们似乎都不起作用。

<?php

include 'connect.php';


// Get values from form 
$p_code=$_GET['projectcode'];
$p_name=$_GET['projectname'];
$budget=$_GET['budget'];
$s_date=$_GET['startdate'];
$e_date=$_GET['enddate'];
$c_year=$_GET['cyear'];
$c_qtr=$_GET['cqtr'];
$c_grp=$_GET['cgrp'];
$sponsor=$_GET['sponsor'];
$client=$_GET['client'];
$p_lead=$_GET['projectlead'];
$orig_hrs=$_GET['originalhrs'];
$risk_per=$_GET['riskpercent'];
$notes=$_GET['notes'];

if ($db_found) {



$SQL = "SELECT * FROM minimodtable 
WHERE projectcode='$p_code' 
OR projectname='$p_name'   
OR budget='$budget' 
OR startdate='$s_date' 
OR enddate='$e_date' 
OR cyear='$c_year' 
OR cqtr='$c_qtr' 
OR cgrp='$c_grp' 
OR sponsor='$sponsor' 
OR client='$client' 
OR projectlead='$p_lead' 
OR originalhrs='$orig_hrs' 
OR riskpercent='$risk_per' 
OR notes='$notes'";

$result = mysqli_query($connect, $SQL);

echo "<table border='1'>
<tr>
<th>Project Code</th>
<th>Project Name</th>
<th>Budget</th>
<th>Start Date</th>
<th>End Date</th>
<th>Year</th>
<th>Quarter</th>
<th>Group</th>
<th>Sponsor</th>
<th>Client</th>
<th>Project Lead</th>
<th>Original Hours</th>
<th>Risk Percent</th>
<th>Notes</th>
</tr>";


while ($row = mysqli_fetch_array($result, MYSQLI_BOTH)) {


echo "<tr>";
echo "<td>" . $row['projectcode'] . "</td>";
echo "<td>" . $row['projectname'] . "</td>";
echo "<td>" . $row['budget'] . "</td>";
echo "<td>" . $row['startdate'] . "</td>";
echo "<td>" . $row['enddate'] . "</td>";
echo "<td>" . $row['cyear'] . "</td>";
echo "<td>" . $row['cqtr'] . "</td>";
echo "<td>" . $row['cgrp'] . "</td>";
echo "<td>" . $row['sponsor'] . "</td>";
echo "<td>" . $row['client'] . "</td>";
echo "<td>" . $row['projectlead'] . "</td>";
echo "<td>" . $row['originalhrs'] . "</td>";
echo "<td>" . $row['riskpercent'] . "</td>";
echo "<td>" . $row['notes'] . "</td>";

}


echo "</table>";



}

mysqli_close($connect);



?>

Answer 1

您已经尝试过了。 不过，这种方法应该可以省去重复很多次的麻烦。 您开始研究isset是正确的-问题是您需要动态构建SQL查询。

实际上，您可能需要将implode()函数中的粘合力从“或”更改为“与”-这样，您可以找到特定预算且与特定代码相关的内容。

我已经将它切换到AND现在-但随时切换回OR -按你的例子。

<?php

// All possible parameters
$params = array(
    'projectcode',
    'projectname',
    'budget',
    'startdate',
    'enddate',
    'cyear',
    'cqtr',
    'cgrp',
    'sponsor',
    'client',
    'projectlead',
    'originalhrs',
    'riskpercent',
    'notes'
);

$wheres = array();
foreach ($params as $param) {

    // Is the param set?
    // If so, let's add it to our list of WHERE clauses
    if (isset($_GET[$param])) {
        $wheres[] = sprintf("%s = '%s'", $param, mysqli_real_escape_string($connect, $_GET[$param]));
    }
}

if ($db_found) {

    // Now let's make the SQL.
    $SQL = 'SELECT * FROM minimodtable';

    // We only want to add the WHERE clause if we had some parameters passed
    if (count($wheres) > 0) {
        $SQL .= ' WHERE ' . implode(' AND ', $wheres);
    }

    $result = mysqli_query($connect, $SQL);

    echo "<table border='1'>
    <tr>
    <th>Project Code</th>
    <th>Project Name</th>
    <th>Budget</th>
    <th>Start Date</th>
    <th>End Date</th>
    <th>Year</th>
    <th>Quarter</th>
    <th>Group</th>
    <th>Sponsor</th>
    <th>Client</th>
    <th>Project Lead</th>
    <th>Original Hours</th>
    <th>Risk Percent</th>
    <th>Notes</th>
    </tr>";

    while ($row = mysqli_fetch_array($result, MYSQLI_BOTH)) {

        echo "<tr>";
        echo "<td>" . $row['projectcode'] . "</td>";
        echo "<td>" . $row['projectname'] . "</td>";
        echo "<td>" . $row['budget'] . "</td>";
        echo "<td>" . $row['startdate'] . "</td>";
        echo "<td>" . $row['enddate'] . "</td>";
        echo "<td>" . $row['cyear'] . "</td>";
        echo "<td>" . $row['cqtr'] . "</td>";
        echo "<td>" . $row['cgrp'] . "</td>";
        echo "<td>" . $row['sponsor'] . "</td>";
        echo "<td>" . $row['client'] . "</td>";
        echo "<td>" . $row['projectlead'] . "</td>";
        echo "<td>" . $row['originalhrs'] . "</td>";
        echo "<td>" . $row['riskpercent'] . "</td>";
        echo "<td>" . $row['notes'] . "</td>";

    }

    echo "</table>";
}

mysqli_close($connect);