将时间写入mysql
String sql="insert into user_write values("+"null"+",'"+write.getUsername()+"','"+write.getTitle()+"','"+write.getContent()+"','"+write.getDate()+"');";
mysql字段为datatime,为什么写不进去呢？怎么样才能写进去呢

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是不是要加个引号哦
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datatime.now