在给表user添加唯一约束unique报的错 添加唯一约束的语句:alter table user add constraint uk_user unique (username); 原因:在给username添加唯一约束时,username的值含有重复的,“123”,因此失败。
回答：用VARCHAR做主键，需要自己手工检测插入到主键的数据是不是有重复的，对应你的newsid数据库检测到重复的主键就会报错，要么取消newsid的主键功能，要么改成int(10)，要么插入数据的时候先检测是否有重复，然后执行插入。追问：newsid我需要一些英文，所以只能射程VARCHAR，，你能告诉我一段检测代码吗。
Error'Duplicate entry '123' for key 'PRIMARY''on query.Defaultdatabase:'testmysql'.Query:'INSERTINTOdatas(id,mname,note,createtime,updatetime, 一旦报错后就不会同步数据了,需要修改mysql.cnf文件 vim/etc/my.cnf # 将此处注释掉的地方,放开注释。 slave_skip_errors=1062 ...
怎么通过key从Map<String, List<String>> map 里面取value? { String key = ***.next(); System.out.println("key="+key); S... for (Iterator<Map.Entry<String, ArrayList<String>>> it&... PHP Notice: Undefined index: username in C:\wamp\www\index.php on line 4 首先,...
a non duplicate column and it is possible that there's already a record with a null value for...
48 Subscription Sync Entry Outlook Used for outlook sync, internal use only. 50 Position Position of a user in the hierarchy 51 System User Manager Map For internal use only. 52 User Search Facet 54 Global Search Configuration 78 Virtual Entity Data Provider Developers can register plug-ins ...
id字段是pk但是没有auto_increment导致你修改记录的时候，会无法更新。
Add dns record for .com in .local domain Add existing Domain Tree into a forest Add host machine to Domain. Add LMHOST Entry Add mac address (hardware) attribute to AD schema Add one more SID for active directory User Add roles and feauture failed Add SID to sIDHistory AD attribute Add...
Duplicate entry '' for key 1 I understand that it means I have a duplicate entry with the ID of 1 or something like that. I can't find where the issue is. Here is the form: <?php echo $lang_settings; ?> <?php echo...
Again when you try to tap into second or multiple users, Since you already set a null value to the username field. MongoDB server allows only one entry of the null valued field. So It will throw an error. Here is the solution. Replace the existing package function of findorcreate with...