mysql_query表示SQL语法错误，但相同的查询在mysql客户端中正常运行
[英]mysql_query says error in sql syntax but the same query works fine in mysql client
问题描述
When I try to send the following query: 
当我尝试发送以下查询时：
SET @attempts=0;
SELECT mt1.TimeStamp, mt1.ReadAttempts - @attempts AS delta,
@attempts := mt1.ReadAttempts ReadAttempts
FROM OneWireStats mt1
WHERE SensorIndex=1 ORDER BY mt1.TimeStamp;
to fetch delta values between rows in table OneWireStats I receive following error: 获取表OneWireStats中的行之间的增量值，我收到以下错误：
Query failed with error: You have an error in your SQL syntax;
When I paste the query from the error printout above into mysql client it works fine. 当我将上述错误打印输出中的查询粘贴到mysql客户端中时，它工作正常。
mysql> SET @attempts=0; SELECT mt1.TimeStamp, mt1.ReadAttempts - @attempts AS delta, @attempts := mt1.ReadAttempts ReadAttempts FROM OneWireStats mt1 WHERE SensorIndex=1 ORDER BY mt1.TimeStamp LIMIT 10; Query OK, 0 rows affected (0.01 sec) +---------------------+-------+--------------+ | TimeStamp | delta | ReadAttempts | +---------------------+-------+--------------+ | 2013-12-23 07:55:01 | 5532 | 5532 | | 2013-12-23 08:00:00 | 302 | 5834 | | 2013-12-23 08:05:01 | 302 | 6136 | | 2013-12-23 08:10:00 | 302 | 6438 | | 2013-12-23 08:15:00 | 302 | 6740 | | 2013-12-23 08:20:01 | 302 | 7042 | | 2013-12-23 08:25:00 | 302 | 7344 | | 2013-12-23 08:30:01 | 302 | 7646 | | 2013-12-23 08:35:00 | 302 | 7948 | | 2013-12-23 08:40:01 | 302 | 8250 | +---------------------+-------+--------------+ 10 rows in set (0.07 sec)
I use the following php code: 我使用以下php代码：
$query = mysql_real_escape_string(trim($queryobj[$counter]));
$sqlresult = mysql_query($query) or die("Query failed with error: ".mysql_error() .
" Query = " . $query . ", Query no: " . $counter);
I do not use any single or double quotes in my query so I do not yet understand the error printout. 我在查询中没有使用任何单引号或双引号，因此我还不了解错误打印输出。
Greatful for hints. 非常有用的提示。
1 个解决方案
解决方案1
3 已采纳 2013-12-26 02:51:22
You need to run each query separately, may be like 您需要分别运行每个查询，可能像
mysql_query( "SET @attempts=0" );
mysql_query( "SELECT mt1.TimeStamp, mt1.ReadAttempts - @attempts AS delta, @attempts := mt1.ReadAttempts ReadAttempts FROM OneWireStats mt1 WHERE SensorIndex=1 ORDER BY mt1.TimeStamp" );
OR use mysqli 's multi_query() , like: 或者使用mysqli的multi_query（） ，例如：
$query = "SET @attempts=0;";
$query .= "SELECT mt1.TimeStamp, mt1.ReadAttempts - @attempts AS delta, @attempts := mt1.ReadAttempts ReadAttempts FROM OneWireStats mt1 WHERE SensorIndex=1 ORDER BY mt1.TimeStamp";
mysqli_multi_query($connection, $query);
mysqli_next_result($connection);
if ($result = mysqli_store_result($connection)) {
//while loop here
}
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