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php如何向数据库中的某串数据后追加内容【急】

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Release： 2016-06-06 20:31:15
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php小白想做个临时用的小工具
php+myspl，SAE 上的。
希望能向某行的tag列里不断追加内容

$sql = "UPDATE tag SET tag =concat(tag,'$biaoqian') WHERE id = '$xuehao'";
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Copy after login

然后什么用也没有
请问应该怎么写才能实现
我也想过先读取再拼接。。。但是发现自己根本不会读取某行某列的内容ORZ

完整的代码

学号:  "; ?> tag: "; ?> getData( $sql ); $biaoqian = $_POST['biaoqian']; $xuehao = $_POST['xuehao']; $sql = "UPDATE tag SET tag =concat(tag,'$biaoqian') WHERE id = '$xuehao'"; $mysql->runSql($sql); if ($mysql->errno() != 0) { die("Error:" . $mysql->errmsg()); } $mysql->closeDb(); echo $mysql->errmsg();
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Copy after login

回复内容：

php小白想做个临时用的小工具
php+myspl，SAE 上的。
希望能向某行的tag列里不断追加内容

$sql = "UPDATE tag SET tag =concat(tag,'$biaoqian') WHERE id = '$xuehao'";
Copy after login
Copy after login

然后什么用也没有
请问应该怎么写才能实现
我也想过先读取再拼接。。。但是发现自己根本不会读取某行某列的内容ORZ

完整的代码

学号:  "; ?> tag: "; ?> getData( $sql ); $biaoqian = $_POST['biaoqian']; $xuehao = $_POST['xuehao']; $sql = "UPDATE tag SET tag =concat(tag,'$biaoqian') WHERE id = '$xuehao'"; $mysql->runSql($sql); if ($mysql->errno() != 0) { die("Error:" . $mysql->errmsg()); } $mysql->closeDb(); echo $mysql->errmsg();
Copy after login
Copy after login

试下$sql = "UPDATE tag SET tag =concat(tag,'$biaoqian') WHERE id =".$xuehao;

tag列是否为字符串类型，如果是的话理论上是没问题的

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