如何獲得由PHP中包含PREPARE和EXECUTE的SQL查詢返回的行？

Question

你如何使用PHP通過this SQL query返回該行：

SET @r := (SELECT ROUND(RAND() * (SELECT COUNT(*) FROM mytable))); 
SET @sql := CONCAT('SELECT * FROM mytable LIMIT ', @r, ', 1'); 
PREPARE stmt1 FROM @sql; 
EXECUTE stmt1; 

設置$query等於以上，然後做平常mysql_query($query)是不返回任何結果。

Answer 1

像這樣做，看看它是否工作

mysql_query('SET @r := (SELECT ROUND(RAND() * (SELECT COUNT(*) FROM mytable)));'); 
mysql_query('SET @sql := CONCAT('SELECT * FROM mytable LIMIT ', @r, ', 1');'); 
$resource = mysql_query('PREPARE stmt1 FROM @sql;EXECUTE stmt1;'); 

不要忘記逃跑的SQL的第二個指令