php - data no inserting into mysql database due to difference in 'quotes'

Question

I am having a very strange problem inserting values into my mysql database, using php, so i was running a test, the simplest of the simple insert; the following doesnt work:

<?php
include("config.php"); // put the *FULL* path to the file.

mysql_query("INSERT INTO 'lms'.'test2' ('trn') VALUES ('17')");

?>

However the following works:(Note the difference in single quotes)

<?php
include("config.php"); // put the *FULL* path to the file.

mysql_query("INSERT INTO `lms`.`test2` (`trn`) VALUES ('17')");

?>

I really can't see what the problem is could I get sum assistance please

Answer 1

您不需要在查询中封装表，除非它们有空格或它们是保留字。

INSERT INTO 'lms'.'test2' ('trn') VALUES ('17')
// This makes no real sense to the db. It should be:
INSERT INTO lms.test2 (trn) VALUES ('17')

如果 trn 列接受数字，它确实应该是：

INSERT INTO lms.test2 (trn) VALUES (17)

使用 MySQL，您可以使用倾斜的引号字符来封装名称，但不能封装字符串。要在查询中输入字符串，您必须使用普通引号，例如'.

你可以这样做：

select `someTable`.`someColumn` from `someTable`

但不是这个：

select someTable.someColumn from someTable where myName=`Tommy`;

正确的用法是：

select someTable.someColumn from someTable where myName='Tommy';