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为啥给表加了读锁之后无法把数据查询出来

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Release： 2016-06-13 12:34:28
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为什么给表加了读锁之后无法把数据查询出来？

mysql_query("LOCK TABLES tablename READ;");<br />
$result=mysql_query($sql, $conn);<br />
mysql_query("UNLOCK TABLES;");
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注释掉第一条语句之后能够正常地把记录查询出来，但是一旦使用第一条语句就什么都查不出来了。

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mysql nbsp query
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