Shulou(Shulou.com)05/31 Report--

This article introduces the relevant knowledge of "how to resolve mysql primary key conflicts". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Description

1. Ignore the conflict and keep the original record.

2. Some fields change after conflicting updates.

3. Conflict replacement first deletes the original record, and then adds a new record.

4. Insert into has the highest efficiency without considering the conflict, and the three methods of conflict resolution will be less efficient.

Need to retrieve, among which three kinds of efficiency are ignore new data > update partial data > replace all.

Example

Create table twee3 (username varchar (50) primary key, password char (32) not null, regtime int unsigned not null) charset utf8; insert into twee3 values ('username','password',12345678); # conflicts ignore insert ignore into twee3 values (' username','12345678',12345678); and that's all for mysql primary key conflicts. Thank you for reading. If you want to know more about the industry, you can follow the website, the editor will output more high-quality practical articles for you!

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