我无法使用这个使用PDO对象和MySQL的脚本来运行用户定义的变量。我了解到,使用PDO,您无法在一次调用中执行两个查询,因此我将其拆分为两个query()
个调用。但它还没有奏效。这是我的脚本中的一个摘要(与MySQL的连接当然是在另一个文件中完成的,我在这里复制它所以它只是为了这个问题而在一个地方):
$db_hostname = 'localhost';
$db_username = 'username';
$db_password = 'pwd';
$db_name = 'dbname';
$dsn = "mysql:dbname=$db_name; host=$db_hostname";
$pdo = new PDO($dsn, $db_username, $db_password);
$strsql = "SET @num := 0, @tp := ''";
$result=$pdo->query($strsql);
$strsql = "SELECT " . $offer . "_tp AS tp, " . $offer . "_level AS best_offer, Price
FROM (
SELECT " . $offer . "_tp, " . $offer . "_level, Price,
@num := if(@tp = `" . $offer . "_tp`, @num + 1, 1) as level,
@tp := `" . $offer . "_tp` as dummy
FROM tbl_limit_offers
WHERE Prod_Code = $procCode) as x
WHERE x.level = 1";
$result = $pdo->query($strsql);
echo $result->rowCount()
如果我直接在PHPmyAdmin中运行该查询,则会返回多条记录。但是,运行它与PDO对象我得到:
致命错误:在非对象
上调用成员函数rowCount()
$result
应该是PDOStatement
对象,rowCount()
应该是其中一种方法。那么,为什么它不起作用?
答案 0 :(得分:0)
$setNumSql = "set @num = ?";
$stmt = $con->preparedStatement($setNumSql );
$stmt->executeQuery($num);
$setTpSql = "set @tp = ?";
$stmt = $con->preparedStatement($setTpSql);
$stmt->executeQuery($tp);
$exampleSql = "select * from tbl where NUM >= @num and TP = @tp";
$stmt = $con->preparedStatement($exampleSql);
$stmt->executeQuery();
return $stmt->fetchAll();
$sql = 'SELECT CONCAT(:offer_1, "_tp") AS tp, CONCAT(:offer_2, "_level") AS best_offer ...';
$binds = array();
$binds['offer_1'] = $offer;
$binds['offer_2'] = $offer;
$stmt = $con->preparedStatement($sql);
$stmt->executeQuery($binds);
优于
$sql = "SELECT " . $offer . "_tp AS tp, " . $offer . "_level AS best_offer ...";
答案 1 :(得分:0)
我弄清楚我的代码出了什么问题。这是PDO对象。设置时,dsn不能有任何空格。删除$dsn
变量中的空格后,一切都按预期工作。
原始$dsn
变量(不起作用):
$dsn = "mysql:dbname=$db_name; host=$db_hostname";
正确的方式(分号后没有空格):
$dsn = "mysql:dbname=$db_name;host=$db_hostname";