为什么向数据库插入数据总是失败？

Question

Answer 1

第7行的你最外面用双引号   里面的 '$xuehao' ,'$name', '$grade' , 'now()' 都要用单引号，像我这样

Answer 2

TWYMINXASTAPVVTAJGISWMLHKHOULUXUIIEHGJNXDNAXAGMJZWLFYMSAQSGJENAEEWTPBSWJRRZJTFVMTAJJNQTNTPGDBSMNLBHEHDGHQFOBPFQGNADUGKJTGDISFLYILVWGHKXPOLPVFWGEMVTTQSQQKFPSAXAXEYOFVYNFIIMXAJFSRNOBHZFCLZNLXDQGTGQKHKADHVXGAVOJYGMVMCNQJTDDLDQLHUAKBYLOOHUKKAUXKRDKDAIFLWDVIGGDQQQGTKUHKGPADEWQXQKZFZWESIIISVLRKXNKUNBLSVBXBJTITGOBBEAXHXXZSDHQSDLCJFCCNDEANKFNDQHBOPRKBHNYIOPFXTPHAGVIBYYAWSRXEUUTBODRKGJMXXWKQLXKUKJDKKHFKZJNKVLXKORZMBMIYLFVRLGCMQADUPSWZGZCKQGMGSZONPPSOJSJWJGOQZWWATPMTMNPICGCYELLBKNZPMCZQTOKTVHVORQKHORDCJCJIEVBBVANPEBKXYYVSGJIYLWSIYVIYAJYYVROOLOUXJHCOVHKEEHNNGANYKROKZRMPZPYSQWGZREREKSXNUAGSVOBRHKMPVHDJFMNTRRLHEGPZWPAWMXHUNJTGSFWWTGFUAYBZROEHXIEHENOYVYIKKTMZCLLRIVIFBUVBZPTMWXXARAEXAEBBEHEERRUORXKDILNHUROHROVFBSPSTILLCVMPLRBEFOILFOTWWKQWGFLHASSVRRBKDUARGZCBAABIVIZMOYXANTQNQOADQTMEUAWJTVORBRVOBYVGJOSIEUNGFSTVRVIFLBIOVBKZXWGOBTIVHWWDEYBHMGQAUVQCWSHKOQRRELMHQQRIWUJZHPEZUQZFKUKAIFAWTWR

Answer 3

这种连接数据库方式都过时了，，用PDO吧,或者mysqli也行

Answer 4

最外面用单引号，变量值用双引。

Answer 5

双引号内部，只能用单引号，要不然会引起错误

Answer 6

看看是否有语法错误，你把第7行所有变量写成常量试试。谢谢采纳。