mySQLのEXECUTEステートメントの後にステートメントの結果を取得するにはどうすればよいですか？

SET @rows := (SELECT COUNT(*)*0.5 FROM trending);
PREPARE STMT FROM 'SELECT * FROM trending order by somecolumn LIMIT ?';
EXECUTE  STMT USING @rows;

私のシステムでは正常に動作します。行数が奇数の場合は切り上げになります

編集：

create table thing2
(   id int auto_increment primary key,
    theWhat varchar(40) not null,
    `count` int not null
);

5行挿入：

insert thing2(theWhat,`count`) values ('anchovies',6),('tomato',1),('cat',99),('mouse',8),('spoon',70);

SET @rows := (SELECT COUNT(*)*0.5 FROM thing2);
PREPARE STMT FROM 'SELECT * FROM thing2 LIMIT ?';
EXECUTE  STMT USING @rows;


count might need to be in backticks (not on my system), if that is actually a column and you are doing
 the following :

SET @rows := (SELECT COUNT(*)*0.5 FROM thing2);
PREPARE STMT FROM 'SELECT * FROM thing2 order by `count` LIMIT ?';
EXECUTE  STMT USING @rows;
+----+-----------+-------+
| id | theWhat   | count |
+----+-----------+-------+
|  2 | tomato    |     1 |
|  1 | anchovies |     6 |
|  4 | mouse     |     8 |
+----+-----------+-------+

SET @rows := (SELECT COUNT(*)*0.5 FROM thing2);
PREPARE STMT FROM 'SELECT * FROM thing2 order by theWhat LIMIT ?';
EXECUTE  STMT USING @rows;
+----+-----------+-------+
| id | theWhat   | count |
+----+-----------+-------+
|  1 | anchovies |     6 |
|  3 | cat       |    99 |
|  4 | mouse     |     8 |
+----+-----------+-------+

Revision1（PHPを表示）

この改訂は、PHPに言及しているopによるものです。したがって、これは、そのクエリの特定の行から与えられた結果セットを使用したマルチクエリを示しています。 @の使用法を示します その値を明確に保持する変数。そして、ヒアドキュメント 変数$theSql マルチクエリ自体に設定されています。

<?php
    error_reporting(E_ALL);
    //mysqli_report(MYSQLI_REPORT_ALL);
    mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
    ini_set('display_errors', 1);

    try {
        $mysqli= new mysqli('localhost', 'dbusername', 'thePassword', 'theDbname'); // tweak accordingly
        if ($mysqli->connect_error) {
            die('Connect Error (' . $mysqli->connect_errno . ') '
                . $mysqli->connect_error);
        }
        echo "I am connected and feel happy.<br/>";

        // Note the 3rd statment below (the EXECUTE) and the code below it that cares about output for the 3rd one only

$theSql = <<<SQL
    SET @rows := (SELECT COUNT(*)*0.5 FROM thing2); 
    PREPARE stmt123 FROM 'SELECT * FROM thing2 LIMIT ?'; 
    EXECUTE stmt123 USING @rows; 
    DEALLOCATE PREPARE stmt123;
SQL;
        $shouldDebug=false; // change to true to see more debug info (such as the skipped multi-query results)
        $theCounter=0;
        $weCareAbout=3; // the 3rd line of the command: "EXECUTE stmt123 USING @rows; "
        if ($mysqli->multi_query($theSql)) {
            do { // Note this loop poached from http://php.net/manual/en/mysqli.multi-query.php
                if ($shouldDebug) echo "1a.<br/>";
                $theCounter++;
                // store first result set
                if ($result = $mysqli->store_result()) {
                    if ($shouldDebug)  echo "1b.<br/>";
                    if ($theCounter==$weCareAbout) {
                        while ($row = $result->fetch_row()) {
                            echo $row[0]." ".$row[1]." ".$row[2]."<br>";
                        }
                    }
                    if ($shouldDebug)  echo "1c.<br/>";
                    $result->free();
                    if ($shouldDebug)  echo "1d.<br/>";
                }
                // print divider 
                if ($mysqli->more_results() && $shouldDebug) {
                    printf("-----------------\n"); 
                }
                if ($shouldDebug) "1e.<br/>";
            } while ($mysqli->next_result() && $mysqli->more_results());
            // above line to avoid error: Strict Standards: mysqli::next_result(): There is no next result set. ...
            // ...Please, call mysqli_more_results()/mysqli::more_results() to check whether to call ...
            //
            // the Manual page is not exactly clear on this. In fact, faulty.
            // http://php.net/manual/en/mysqli.multi-query.php
        }

        $mysqli->close();   // just showing it, what the heck
    } catch (mysqli_sql_exception $e) { 
        throw $e; 
    } 
?>

ブラウザ出力：

I am connected and feel happy.
1 anchovies 6
2 tomato 1
3 cat 99

上記のdo/whileの長所と短所は、渡されたクエリに基づいて4回そのループにいることです。

マニュアルページ mysqli.multi-queryを参照してください。 および mysqli.store-result 。