按字母順序對MySQL結果進行排序

Question

我正在建立一個在線圖書數據庫，並且我有這個php腳本來搜索mysql數據庫並獲取結果。 由於某種原因，結果是隨機的。 有沒有人按作者排序？ （在表單中為author field = search_author的名稱，在mysql列中為Author。）

    $search_titles=$_POST["search_titles"];
$search_authors=$_POST["search_authors"];
$search_shelf=$_POST["search_shelf"];
$search_genre=$_POST["search_genre"];

////////////////////////////////////////////////////////////////
//build the mySQL query string. Required something like this (the uppercase kwords are SQL commands): 
//SELECT * FROM booklist WHERE Title LIKE 'Computing' AND Author LIKE 'borg'
//Instead of AND, you might want to try OR

$query_string ="SELECT * FROM booklist WHERE ";

$insert_AND = false;  //a flag to indicate when an AND keyword needs to be inserted

//only include search terms/fields that have been specified in form (not empty, but note that a bunch of spaces will be treated as non-empty ... to-fix by validating form)
if ($search_titles != ""){
    $query_string .= "Title LIKE '%".$search_titles."%'";    //the % is a wild card
    $insert_AND = true;
}   

if ($search_genre != ""){
    $query_string .= "Genre LIKE '%".$search_genre."%'";    //the % is a wild card
    $insert_AND = true;
}   

if ($search_authors != ""){
    if ($insert_AND) $query_string .= " AND ";    //you might want to 
    $query_string .= "Author LIKE '%".$search_authors."%'"; 
    $insert_AND = true;
}       

if ($search_shelf != ""){
    if ($insert_AND) $query_string .= " AND ";
    $query_string .= "ShelfNumber LIKE '%".$search_shelf."%'"; 
}       

//echo($query_string);
//done building the query string
//////////////////////////////////////////////////////////////////////

//perform the query on the db using the query string 
$result_array = mysql_query($query_string )or die(mysql_error());

//The sql server will return a 2D array containing the results (if any).
//Output these to the browser
if(mysql_num_rows($result_array)==0){  //i.e. an empty array was returned, meaning no results
    echo "NO MATCHES FOUND";
}else{      //mathces found

    echo mysql_num_rows($result_array) . " results found <BR><HR>";     

    while ($row = mysql_fetch_assoc($result_array)) {   //loop through the array, each time displaying a result from the next row, until all rows have been displayed
        echo "<B>Title: </B>" . $row['Title'] . "<BR>";
        echo "<B>Author: </B>" . $row['Author']. "<BR>";
        echo "<B>Genre: </B>" . $row['Genre']. "<BR>";
        echo "<B>Shelf: </B>". $row['ShelfNumber']. "<BR>";
        //note that the other fields (e.g. genre, etc) are also in the array since in the query string '*' (i.e. all fields) was specified.
        echo "<HR>";
    }

}

Answer 1

在查詢末尾輸入以下內容：

ORDER BY search_author ASC

Answer 2

為了按作者 排序 ，您需要在查詢中添加ORDER BY子句：

if ($search_authors != ""){
    if ($insert_AND) $query_string .= " AND ";    //you might want to 
    $query_string .= "Author LIKE '%".$search_authors."%' ORDER BY Author ASC"; 
    $insert_AND = true;
}

MySQL文檔：排序選項

正如發問者所言，提及現有答案時，它的理解不正確：

表單中author字段的名稱= search_author，mysql列中的Author的名稱。

它應該是ORDER BY Author ASC而不是ORDER BY search_author ASC 。

編輯1：

為了使它在添加查詢的情況下正常運行，您應該在if ($search_authors != ""){下面加上if ($search_shelf != ""){