Question

我目前正在研究生院的一个项目。我正在构建一个可写和可搜索的数据库。我已经完成了可写的方面，但是我遇到了搜索功能的问题。问题是我无法在数据库中搜索和显示单个行，只能搜索和显示整个数据库，如果数据库有20k项且您只需要20，那么说实话，功能不是很有用。

我正在完整地复制下面的代码。

        <?php
        ini_set('display_errors', 'On');
        error_reporting(E_ALL | E_NOTICE);

        // --------------------------------------------------------
        /* THIS DEMO FILE ACCEPTS DATA FROM A WEB FORM
        AND SAVES THE DATA TO A FLAT FILE AND THEN TO A DATABASE.
        AS A CHECK WE READ THE DATA BACK FROM THE TABLE AND FROM
        THE FILE.
        Created by: PATRICK DUFF, based on example written by G. Benoit, on 2/28/15 
        Modified on: 3/1/15, 3/5/15/ 3/13/15
        Contact: xxxxxxx
        */
        // --------------------------------------------------------
        /* GETTING READY FOR THE DATA */
        /* the file to hold the data */
        $filename = "testData.txt";
        $status = "";
        /* name of the database, table, username, password, table */
        $hostname = "xxxxxxx"; // change this vars for your own db
        $username = "xxxxx"; // whatever your student email user name is
        $password = "xxxxx"; // your usual password
        $dbname = "xxxxxx"; // this database name is assigned for you by the Lab Staff Lab Staff
        $table = "xxxxxx"; // once you’re using your DB, you can create your own tables

        //getting data from webfrom

        $isbn = $_POST["isbn"];
        $lname = $_POST["lname"];
        $fname = $_POST["fname"];
        $title = $_POST["title"];
        $publisher = $_POST["publisher"];
        $genre = $_POST["genre"];
        $con = mysqli_connect("$hostname", "$username", "$password", "$dbname");
    $isbn = $_POST["isbn"];
$lname = $_POST["lname"];
$fname = $_POST["fname"];
$title = $_POST["title"];
$publisher = $_POST["publisher"];
$genre = $_POST["genre"];
$con = mysqli_connect("$hostname", "$username", "$password", "$dbname");

//retrieving data from flat form & database.

echo "<!DOCTYPE html><html><head> <title> Record Search </title></head>";
echo "<body> Here is the data: The file contents of 'testData.txt so far is/are: ";
echo file_get_contents($filename);
echo "<hr /> End of reading file. Attempting to read database <hr />";
//creating searchability
$sql= "SELECT * FROM myLibrary WHERE isbn LIKE '%" .$isbn." %' OR fname LIKE '%" .$fname." %' OR lname LIKE'%" .$lname." %' OR title LIKE '%" .$title." %' OR publisher LIKE '%" .$publisher." %' OR genre LIKE'%" .$genre."%'  ORDER BY lname"  or
    die(mysql_error());
$result = mysqli_query($con, $sql);

//displays result in table
if ($result->num_rows > 0) {
        echo "<table id='myLibrary'><tr><th><u>ISBN</u></th><th> <u>First Name</u></th><th><u> Last Name </u></th><th><u> Title</u> </th><th><u>Publisher</u></th> <th><u>Genre</u></th></tr>";
    // output data of each row
    while($row = mysqli_fetch_array($result)) {
        echo "<tr><td>" . $row["isbn"]."</td><td>". $row["fname"]."</td><td>" . $row["lname"]. "</td><td>" .$row["title"]. "</td><td>" .$row["publisher"]. "</td><td>".$row["genre"]. "</td></tr>";
    }   
    echo "</table>";
} else {
    echo "0 results";
}

echo "End of Results";

出于某种原因，当我注释掉表格时，表格中没有任何内容显示出来。

我希望这很清楚，这是我第一次在这里发帖。

Answer 1

您只需要限制查询以避免返回所有结果。

$limit = 10;
$sql= "SELECT * FROM myLibrary WHERE isbn LIKE '%" .$isbn." %' OR fname LIKE '%" .$fname." %' OR lname LIKE'%" .$lname." %' OR title LIKE '%" .$title." %' OR publisher LIKE '%" .$publisher." %' OR genre LIKE'%" .$genre."%'  ORDER BY lname LIMIT " .$limit . ""

选择语法无法正确显示（不确定是否重复）

1 个答案: