Question

我有一个HTML页面，人们可以输入信息来搜索数据库。选项包括：作者，标题，类别，年份和ISBN。

一个人可以输入作者姓名来搜索他们所写的书籍。但是，我希望他们能够将作者姓名+类别放入检索记录中。代码下划线无法正常运行。

任何帮助将不胜感激。

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Answer 1

这似乎是一个更合适的解决方案。

<?php
$fields=array('Author','Title','Category','Year','ISBN');

$query="SELECT * FROM Test WHERE ";

$first=true;
//unset fields that were not provided. Could be done inside of the next foreach
//but for simplicity reasons we will just do it here
foreach($fields as $key=>$val)
{
        if(!isset($_POST[$val]))
                unset($fields[$key]);
}

//now we only have fields that have data
foreach($fields as $field)
{
        if($first)
        {
                $query.="`$field`='".$con->real_escape_string($_POST[$field])."' ";
                $first=false;
        }
        else
        {
                $query.=" AND `$field`='".$con->real_escape_string($_POST[$field])."'";
        }

}

$result = mysqli_query($con, $sql);

echo "<table border=1>";
echo "<tr><th>Author</th><th>Title</th><th>Category</th><th>Year</th><th>ISBN</th></tr>";

while ($row = mysqli_fetch_assoc($result))
{
        echo "<tr><td>" . $row['Author'] . "</td><td>" . $row['Title'] . "</td><td>" .  $row['Category'] . "</td><td>" .  $row['Year'] . "</td><td>" .  $row['ISBN'] . "</td></tr>";
}
echo "</table><br><br>";

SQL搜索的IF语句

1 个答案: