保留图片指纹(一串乱码)到mysql, 求分析

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 update test set `bitmap` ='蒇+W&+N{|\0Ox0\\$8)sld\"Z|y|\0ZZ!\0]P!
Zw\Z\Zgm|p\"y^W|)Q,\0xc{\0\Z\\[#]pEXcto[ER`\'l{b&8P8
j[w1y^t|d0YSMK![sj\0Kyww7)PE\ZIPv^m|\0\0\0{\0PK^\0y|x-e^|jcxc|`N
' where id = 168; <br />

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$query = "update test set `bitmap` ='".mysql_real_escape_string($bitmap)."' where id = {$picture['id']};";<br />
1366: Incorrect string value: '\xDD[+W&+...' for column 'bitmap' at row 1<br />