將MySQLi查詢存儲在PHP變量中

Question

我正在嘗試將MySQL查詢傳遞給變量，但它沒有正確存儲它。 我想將查詢結果存儲為字符串。

這是我的嘗試：

$authorid = $db->query("SELECT Author_ID FROM Authors WHERE Author_Name = '$author'");

該查詢在PHPMyAdmin中可以正常工作，因此我知道它返回了正確的信息，但是我不確定這是否是存儲它的正確方法。

我試圖為此使用它：

$authoredquery = $db->query("SELECT Author_ID, Article_ID 
FROM Articles_Authored 
WHERE Author_ID = '$authorid' AND Article_ID ='$articleid'");

所有查詢的拼寫正確。 我覺得這會將查詢結果存儲為字符串。

這是提交表單后運行的php代碼的一部分：

    $dbHost = "localhost";
    $dbUsername = "admin";
    $dbPassword = "qegc0Qfs";
    $dbName = "webdb";

    // Create connection
    $db = new mysqli($dbHost, $dbUsername, $dbPassword, $dbName);
    // Check connection
    if ($db->connect_error) {
    die("Connection failed: " . $db->connect_error);
    } else {
    // Post PHP variables
    $journal = $_POST['journal_radio'];
    $article_name = $_POST['article_name'];
    $author1 = $_POST['author1_name'];
    $author1uni = $_POST['author1_university'];
    $author2 = $_POST['author2_name'];
    $author2uni = $_POST['author2_university'];
    $author3 = $_POST['author3_name'];
    $author3uni = $_POST['author3_university'];
    $author4 = $_POST['author4_name'];
    $author4uni = $_POST['author4_university'];
    $author5 = $_POST['author5_name'];
    $author5uni = $_POST['author5_university'];
    $author6 = $_POST['author6_name'];
    $author6uni = $_POST['author6_university'];
    $year = $_POST['year'];
    $security = $_POST['is_security'];
    function authorinfoinsert($author, $number, $authoruni, $articleid, $article, $db){
            //check if Author already exists
            $authorquery = $db->query("SELECT Author_Name FROM Authors WHERE Author_Name = '$author'");
            if($authorquery->num_rows != 0) {
               echo '<a href="> New Input </a><br />';
               echo 'Author ' . $number . ' - ' . $author . ' - already present<br />';

            } else {
                //insert author if doesnt exist
                $authorinsert = "INSERT INTO Authors (Author_Name) VALUES ('$author')";

                if ($db->query($authorinsert) === TRUE) {
                echo 'Author ' . $number . ' - ' . $author . ' - created successfully.<br />';
                } else {
                echo 'Error: ' . $authorinsert . '<br />' . $db->error . '<br />';
                }
              }

            // store Author Author_ID value

            $authorid = $db->query("SELECT Author_ID FROM Authors WHERE Author_Name = '$author'");


            //check if Author University exists
            $authoruniquery = $db->query("SELECT University_Name FROM University WHERE University_Name = '$authoruni'");

            if($authoruniquery->num_rows != 0) {
               echo '<a href=""> New Input </a><br />';
               echo 'Author ' . $number . ' University already present <br />';

            } else {
                //insert university if doesnt exist
                $uniinsert = "INSERT INTO University (University_Name) VALUES ('$authoruni')";

                if ($db->query($uniinsert) === TRUE) {
                echo 'Author ' . $number . ' University - ' . $authoruni . ' - created successfully.<br />';
                } else {
                echo 'Error: ' . $uniinsert . "<br>" . $db->error . '<br />';
                }
              }

            // store Author University_ID value
            $authoruniid = $db->query("SELECT University_ID FROM University WHERE University_Name = '$authoruni'");
            echo $authoruniid;
            //Enter Author and Article in Articles_Authored
            $authoredquery = $db->query("SELECT Author_ID, Article_ID FROM Articles_Authored WHERE Author_ID = '$authorid' AND Article_ID ='$articleid'");
            if($authoredquery->num_rows != 0) {
               echo '<a href=""> New Input </a><br />';
               echo 'Article Authored entry for Author ' . $number . ' - ' . $author . ' - already present<br />';

            } else {
            $articlesauthoredinsert = "INSERT INTO Articles_Authored (Article_ID, Author_ID, Name_Authored_As) VALUES ('$articleid','$authorid','$author')";

                if ($db->query($articlesauthoredinsert) === TRUE) {
                echo 'Article Authored - Author ' . $number . ' - created successfully <br />';
                } else {
                echo 'Error: ' . $articlesauthoredinsert . "<br>" . $db->error . '<br />';
                }
            }

            //Enter Author University instance in Author_University
            $authoruniinsert = "INSERT INTO Author_University (Article_ID, Author_ID, University_ID) VALUES ('$articleid','$authorid','$authoruniid')";

                if ($db->query($authoruniinsert) === TRUE) {
                echo 'University instance for Author ' . $number  . ' created successfully<br />';
                } else {
                echo 'Error: ' . $authoruniinsert . "<br>" . $db->error . '<br />';
                }
            }

我將args傳遞給這樣的函數：

authorinfoinsert($author1, 1, $author1uni, $articleid, $article, $db);

如果有幫助，這里是所有代碼。 對不起，我知道很多：

 <!DOCTYPE html> <html lang="en"> <head> <title>Input Form - Research Ranker</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css"> <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script> <script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script> <link rel="stylesheet" href="//code.jquery.com/ui/1.11.4/themes/smoothness/jquery-ui.css"> <script src="//code.jquery.com/jquery-1.10.2.js"></script> <script src="//code.jquery.com/ui/1.11.4/jquery-ui.js"></script> <script> $(function() { $( "#article_name" ).autocomplete({ </head> <body> <?PHP if(!isset($_POST['submit'])){ print ' <div class="container-fluid ui-widget"> <form class="form-horizontal" method="post" action="test.php" onsubmit="return confirm("Is all of your data correct?");"> <fieldset> <!-- Article Input --> <legend>Article Input</legend> <!-- Journal Radio Buttons (value is journal ISSN)--> <div class="form-group"> <label class="col-md-4 control-label" for="journal_radio">Journal</label> <div class="col-md-4"> <div class="radio"> <label for="journal_radio-0"> <input type="radio" name="journal_radio" id="journal_radio-0" value="2162-9730" checked="checked"> MIS Quarterly </label> </div> <div class="radio"> <label for="journal_radio-1"> <input type="radio" name="journal_radio" id="journal_radio-1" value="1047-7047"> Information Systems Research </label> </div> <div class="radio"> <label for="journal_radio-2"> <input type="radio" name="journal_radio" id="journal_radio-2" value="0742-1222"> Journal of Management Information Systems </label> </div> <div class="radio"> <label for="journal_radio-3"> <input type="radio" name="journal_radio" id="journal_radio-3" value="1536-9323"> Journal of the Association for Information Systems </label> </div> <div class="radio"> <label for="journal_radio-4"> <input type="radio" name="journal_radio" id="journal_radio-4" value="1476-9344"> European Journal of Information Systems </label> </div> <div class="radio"> <label for="journal_radio-5"> <input type="radio" name="journal_radio" id="journal_radio-5" value="1365-2575"> Information Systems Journal </label> </div> <div class="radio"> <label for="journal_radio-6"> <input type="radio" name="journal_radio" id="journal_radio-6" value="0963-8687"> Journal of Strategic Information Systems </label> </div> <div class="radio"> <label for="journal_radio-7"> <input type="radio" name="journal_radio" id="journal_radio-7" value="0268-3962"> Journal of Information Technology </label> </div> <div class="radio"> <label for="journal_radio-8"> <input type="radio" name="journal_radio" id="journal_radio-8" value="0167-9236"> Decision Support Systems </label> </div> <div class="radio"> <label for="journal_radio-9"> <input type="radio" name="journal_radio" id="journal_radio-9" value="0378-7206"> Information and Management </label> </div> </div> </div> <!-- Article Name Input--> <div class="form-group"> <label class="col-md-4 control-label" for="article_name">Article Name:</label> <div class="col-md-5"> <input id="article_name" name="article_name" type="text" placeholder="Article Name" class="form-control input-md" required=""> </div> </div> <!-- Author 1--> <div class="form-group"> <label class="col-md-4 control-label" for="author1_name">Author 1:</label> <div class="col-md-4"> <input id="author1_name" name="author1_name" type="text" placeholder="Author Name" class="form-control input-md" required=""> </div> </div> <!-- Author 1 University --> <div class="form-group"> <label class="col-md-4 control-label" for="author1_university">University:</label> <div class="col-md-4"> <input id="author1_university" name="author1_university" type="text" placeholder="Author University" class="form-control input-md" required=""> </div> </div> <!-- Author 2--> <div class="form-group"> <label class="col-md-4 control-label" for="author2_name">Author 2:</label> <div class="col-md-4"> <input id="author2_name" name="author2_name" type="text" placeholder="" class="form-control input-md"> </div> </div> <!-- Author 2 University--> <div class="form-group"> <label class="col-md-4 control-label" for="author2_university">University:</label> <div class="col-md-4"> <input id="author2_university" name="author2_university" type="text" placeholder="" class="form-control input-md"> </div> </div> <!-- Author 3--> <div class="form-group"> <label class="col-md-4 control-label" for="author3_name">Author 3:</label> <div class="col-md-4"> <input id="author3_name" name="author3_name" type="text" placeholder="" class="form-control input-md"> </div> </div> <!-- Author 3 University--> <div class="form-group"> <label class="col-md-4 control-label" for="author3_university">University:</label> <div class="col-md-4"> <input id="author3_university" name="author3_university" type="text" placeholder="" class="form-control input-md"> </div> </div> <!-- Author 4--> <div class="form-group"> <label class="col-md-4 control-label" for="author4_name">Author 4: </label> <div class="col-md-4"> <input id="author4_name" name="author4_name" type="text" placeholder="" class="form-control input-md"> </div> </div> <!-- Author 4 University--> <div class="form-group"> <label class="col-md-4 control-label" for="author4_university">University:</label> <div class="col-md-4"> <input id="author4_university" name="author4_university" type="text" placeholder="" class="form-control input-md"> </div> </div> <!-- Author 5--> <div class="form-group"> <label class="col-md-4 control-label" for="author5_name">Author 5:</label> <div class="col-md-4"> <input id="author5_name" name="author5_name" type="text" placeholder="" class="form-control input-md"> </div> </div> <!-- Author 5 University--> <div class="form-group"> <label class="col-md-4 control-label" for="author5_university">University:</label> <div class="col-md-4"> <input id="author5_university" name="author5_university" type="text" placeholder="" class="form-control input-md"> </div> </div> <!-- Author 6--> <div class="form-group"> <label class="col-md-4 control-label" for="author6_name">Author 6:</label> <div class="col-md-4"> <input id="author6_name" name="author6_name" type="text" placeholder="" class="form-control input-md"> </div> </div> <!-- Author 6 University--> <div class="form-group"> <label class="col-md-4 control-label" for="author6_university">University:</label> <div class="col-md-4"> <input id="author6_university" name="author6_university" type="text" placeholder="" class="form-control input-md"> </div> </div> <!-- Select Year Published --> <div class="form-group"> <label class="col-md-4 control-label" for="year">Year Published</label> <div class="col-md-4"> <select id="year" name="year" class="form-control"> <option value="2010">2010</option> <option value="2011">2011</option> <option value="2012">2012</option> <option value="2013">2013</option> <option value="2014">2014</option> <option value="2015">2015</option> </select> </div> </div> <!-- Is Security Checkbox --> <div class="form-group"> <label class="col-md-4 control-label" for="is_security"></label> <div class="col-md-4"> <label class="checkbox-inline" for="is_security-0"> <input type="checkbox" name="is_security" id="is_security" value="1"> Security Related </label> </div> </div> <!-- Submit Form Button --> <div class="form-group"> <div class="col-md-4 control-label"> <button id="submit" name="submit" class="btn btn-primary">Submit</button> </div> </div> </fieldset> </form> </div>'; } else { $dbHost = "localhost"; $dbUsername = "admin"; $dbPassword = "qegc0Qfs"; $dbName = "webdb"; // Create connection $db = new mysqli($dbHost, $dbUsername, $dbPassword, $dbName); // Check connection if ($db->connect_error) { die("Connection failed: " . $db->connect_error); } else { // Post PHP variables $journal = $_POST['journal_radio']; $article_name = $_POST['article_name']; $author1 = $_POST['author1_name']; $author1uni = $_POST['author1_university']; $author2 = $_POST['author2_name']; $author2uni = $_POST['author2_university']; $author3 = $_POST['author3_name']; $author3uni = $_POST['author3_university']; $author4 = $_POST['author4_name']; $author4uni = $_POST['author4_university']; $author5 = $_POST['author5_name']; $author5uni = $_POST['author5_university']; $author6 = $_POST['author6_name']; $author6uni = $_POST['author6_university']; $year = $_POST['year']; $security = $_POST['is_security']; function authorinfoinsert($author, $number, $authoruni, $articleid, $article, $db){ //check if Author already exists $authorquery = $db->query("SELECT Author_Name FROM Authors WHERE Author_Name = '$author'"); if($authorquery->num_rows != 0) { echo '<a href=""> New Input </a><br />'; echo 'Author ' . $number . ' - ' . $author . ' - already present<br />'; } else { //insert author if doesnt exist $authorinsert = "INSERT INTO Authors (Author_Name) VALUES ('$author')"; if ($db->query($authorinsert) === TRUE) { echo 'Author ' . $number . ' - ' . $author . ' - created successfully.<br />'; } else { echo 'Error: ' . $authorinsert . '<br />' . $db->error . '<br />'; } } // store Author Author_ID value $authorid = $db->query("SELECT Author_ID FROM Authors WHERE Author_Name = '$author'"); //check if Author University exists $authoruniquery = $db->query("SELECT University_Name FROM University WHERE University_Name = '$authoruni'"); if($authoruniquery->num_rows != 0) { echo '<a href=""> New Input </a><br />'; echo 'Author ' . $number . ' University already present <br />'; } else { //insert university if doesnt exist $uniinsert = "INSERT INTO University (University_Name) VALUES ('$authoruni')"; if ($db->query($uniinsert) === TRUE) { echo 'Author ' . $number . ' University - ' . $authoruni . ' - created successfully.<br />'; } else { echo 'Error: ' . $uniinsert . "<br>" . $db->error . '<br />'; } } // store Author University_ID value $authoruniid = $db->query("SELECT University_ID FROM University WHERE University_Name = '$authoruni'"); echo $authoruniid; //Enter Author and Article in Articles_Authored $authoredquery = $db->query("SELECT Author_ID, Article_ID FROM Articles_Authored WHERE Author_ID = '$authorid' AND Article_ID ='$articleid'"); if($authoredquery->num_rows != 0) { echo '<a href=""> New Input </a><br />'; echo 'Article Authored entry for Author ' . $number . ' - ' . $author . ' - already present<br />'; } else { $articlesauthoredinsert = "INSERT INTO Articles_Authored (Article_ID, Author_ID, Name_Authored_As) VALUES ('$articleid','$authorid','$author')"; if ($db->query($articlesauthoredinsert) === TRUE) { echo 'Article Authored - Author ' . $number . ' - created successfully <br />'; } else { echo 'Error: ' . $articlesauthoredinsert . "<br>" . $db->error . '<br />'; } } //Enter Author University instance in Author_University $authoruniinsert = "INSERT INTO Author_University (Article_ID, Author_ID, University_ID) VALUES ('$articleid','$authorid','$authoruniid')"; if ($db->query($authoruniinsert) === TRUE) { echo 'University instance for Author ' . $number . ' created successfully<br />'; } else { echo 'Error: ' . $authoruniinsert . "<br>" . $db->error . '<br />'; } } //check if article exist $articlequery = $db->query("SELECT Article_Title, ISSN FROM Articles WHERE Article_Title = '$article_name' AND ISSN = '$journal'"); if($articlequery->num_rows != 0) { echo '<a href=""> New Input </a><br />'; echo "<script type= 'text/javascript'>alert('Article Already Present');</script>"; } else { //insert article if doesn't exist $articleinsert = "INSERT INTO Articles (ISSN, Year_Published, Is_Security, Article_Title) VALUES ('$journal','$year','$security','$article_name')"; if ($db->query($articleinsert) === TRUE) { echo 'New Article - ' . $article_name . ' - created successfully<br />'; } else { echo 'Error: ' . $articleinsert . "<br>" . $db->error . '<br />'; } // store Article_ID value $articleid = $db->query("SELECT Article_ID FROM Articles WHERE Article_Title = '$article_name' AND ISSN = '$journal'"); //insert author 1 info authorinfoinsert($author1, 1, $author1uni, $articleid, $article, $db); //check if Author 2 has input if (isset($author2)){ authorinfoinsert($author2, 2, $author2uni, $articleid, $article, $db); } //check if Author 3 has input if (isset($author3)){ authorinfoinsert($author3, 3, $author3uni, $articleid, $article, $db); } //check if Author 4 has input if (isset($author4)){ authorinfoinsert($author4, 4, $author4uni, $articleid, $article, $db); } //check if Author 5 has input if (isset($author5)){ authorinfoinsert($author5, 5, $author5uni, $articleid, $article, $db); } //check if Author 6 has input if (isset($author6)){ authorinfoinsert($author6, 6, $author6uni, $articleid, $article, $db); } else{ $db->close(); } } } } ?> </body> </html> 

Answer 1

好的，根據您告訴我的內容，您正在嘗試將該對象用作字符串，這就是為什么它不起作用的原因。

$ authorid只是$ db-> query（）; 它返回一個您需要進行處理的對象。 在這種情況下，您需要像這樣從中獲取結果：

$result = $db->query("SELECT Author_ID FROM Authors WHERE Author_Name = '$author'");
$row = $result->fetch_assoc();
$authorid = $row['Author_ID'];

試試看:)

Answer 2

我最好的猜測是它返回的是數組而不是字符串，這就是為什么“ echo”和“ print”將不起作用的原因。

您可以嘗試使用print_r($authoruniid)查看數組的結構，然后從那里訪問數據。

Answer 3

我認為您需要使用mysqli fetch_assoc()獲取查詢結果

您必須將代碼更改為：

$dbHost = "localhost";
$dbUsername = "admin";
$dbPassword = "qegc0Qfs";
$dbName = "webdb";

// Create connection
$db = new mysqli($dbHost, $dbUsername, $dbPassword, $dbName);
// Check connection
if ($db->connect_error) {
    die("Connection failed: " . $db->connect_error);
} else {
// Post PHP variables
    $journal = $_POST['journal_radio'];
    $article_name = $_POST['article_name'];
    $author1 = $_POST['author1_name'];
    $author1uni = $_POST['author1_university'];
    $author2 = $_POST['author2_name'];
    $author2uni = $_POST['author2_university'];
    $author3 = $_POST['author3_name'];
    $author3uni = $_POST['author3_university'];
    $author4 = $_POST['author4_name'];
    $author4uni = $_POST['author4_university'];
    $author5 = $_POST['author5_name'];
    $author5uni = $_POST['author5_university'];
    $author6 = $_POST['author6_name'];
    $author6uni = $_POST['author6_university'];
    $year = $_POST['year'];
    $security = $_POST['is_security'];

    function authorinfoinsert($author, $number, $authoruni, $articleid, $article, $db) {
//check if Author already exists
        $authorquery = $db->query("SELECT Author_Name FROM Authors WHERE Author_Name = '$author'");
        if ($authorquery->num_rows != 0) {
            echo '<a href="myUrl"> New Input </a><br />';
            echo 'Author ' . $number . ' - ' . $author . ' - already present<br />';
        } else {
//insert author if doesnt exist
            $authorinsert = "INSERT INTO Authors (Author_Name) VALUES ('$author')";

            if ($db->query($authorinsert) === TRUE) {
                echo 'Author ' . $number . ' - ' . $author . ' - created successfully.<br />';
            } else {
                echo 'Error: ' . $authorinsert . '<br />' . $db->error . '<br />';
            }
        }

// store Author Author_ID value

        $authorid = $db->query("SELECT Author_ID FROM Authors WHERE Author_Name = '$author'");
        while ($row = $authorid->fetch_assoc()) {
            /
            echo $row['Author_ID'];
        }
//check if Author University exists
        $authoruniquery = $db->query("SELECT University_Name FROM University WHERE University_Name = '$authoruni'");

        if ($authoruniquery->num_rows != 0) {
            echo '<a href="myUrl"> New Input </a><br />';
            echo 'Author ' . $number . ' University already present <br />';
        } else {
//insert university if doesnt exist
            $uniinsert = "INSERT INTO University (University_Name) VALUES ('$authoruni')";

            if ($db->query($uniinsert) === TRUE) {
                echo 'Author ' . $number . ' University - ' . $authoruni . ' - created successfully.<br />';
            } else {
                echo 'Error: ' . $uniinsert . "<br>" . $db->error . '<br />';
            }
        }

// store Author University_ID value
        $authoruniid = $db->query("SELECT University_ID FROM University WHERE University_Name = '$authoruni'");
        while ($row = $authorid->fetch_assoc()) {/// better use this in a while loop to getting all records
            echo $row['University_ID'];
        }
//Enter Author and Article in Articles_Authored
        $authoredquery = $db->query("SELECT Author_ID, Article_ID FROM Articles_Authored WHERE Author_ID = '$authorid' AND Article_ID ='$articleid'");
        if ($authoredquery->num_rows != 0) {
            echo '<a href="myUrl"> New Input </a><br />';
            echo 'Article Authored entry for Author ' . $number . ' - ' . $author . ' - already present<br />';
        } else {
            $articlesauthoredinsert = "INSERT INTO Articles_Authored (Article_ID, Author_ID, Name_Authored_As) VALUES ('$articleid','$authorid','$author')";

            if ($db->query($articlesauthoredinsert) === TRUE) {
                echo 'Article Authored - Author ' . $number . ' - created successfully <br />';
            } else {
                echo 'Error: ' . $articlesauthoredinsert . "<br>" . $db->error . '<br />';
            }
        }

//Enter Author University instance in Author_University
        $authoruniinsert = "INSERT INTO Author_University (Article_ID, Author_ID, University_ID) VALUES ('$articleid','$authorid','$authoruniid')";

        if ($db->query($authoruniinsert) === TRUE) {
            echo 'University instance for Author ' . $number . ' created successfully<br />';
        } else {
            echo 'Error: ' . $authoruniinsert . "<br>" . $db->error . '<br />';
        }
    }

有關mysql_fetch_assoc（）的更多信息，請單擊此處