10 recommended articles about primary key ID

This article mainly introduces the method of MyBatis+MySQL to return the inserted primary key ID. It has certain reference value. Interested friends can refer to it. Requirement: After using MyBatis to insert a record into the MySQL database, the auto-incremented primary key value of the record needs to be returned. Method: Specify the keyProperty attribute in the mapper. The example is as follows: insert into user(userName,password,comment)

1. java implements the instance method of returning the newly added primary key ID

Introduction: This article mainly introduces the method of MyBatis+MySQL to return the inserted primary key ID. It has certain reference value. Interested friends can refer to it.

2. MySQL-detailed performance comparison of uuid as primary key and int as primary key

Introduction: By chance, I learned that the query performance of mysql primary key using varchar to store UUID is not as good as int type primary key. Searching a lot of information on the Internet is only theoretical. Therefore, I wrote the code myself for actual testing. The following results are for reference only and are not authoritative. The fields of the three tables are all varchar, except that the primary key ID is varchar, bigint and auto-increase bigint. The other three fields are varchar. 36-bit database: mysql5.5 table type: InnoDB data

3. Detailed introduction to the code to solve the MySQL deadlock problem

##Introduction: According to this Analyze and try to solve the problem by establishing a UNIQUE (unique index) through the two fields tel_id and task_id. (You can also query it first and then update it based on the primary key ID, so that the large amount of data in the table will not affect online business).

4. Help: How does mysql find results based on the given ID order?

Introduction: Dear masters, now I have encountered a problem and need your help. There are the following two tables post table: article table. record table: record table, used to record the user's reading order. The record table uses a field postid to record the primary key ID of the post table according to the order in which the user reads articles, that is, record.p...

5. Learn sphinx sphinx Chinese django sphinx python sphinx usage

Introduction: sphinx: Learning sphinx: How to use sphinx technology in our PHP development? Answer: Corresponding to the fields in the MySQL database, the Chinese information in the fields is split into multiple words, and then the words are indexed. When querying in the future, first query these index files, then return the primary key IDs of the records that meet the conditions, and then query the MySQL database based on the primary key IDs to return the records. What is sphinx? (Baidu Encyclopedia) Note: For sphinx, if there are tens of millions of records in a single table, the response time is at the millisecond level. Note: By default sphinx only supports English and

##6.

Detailed explanation of using PHP recursion to implement infinite classified formatted arrays_PHP tutorial

Introduction: Detailed explanation of using PHP recursion to implement infinite classified formatted arrays. We want to make an infinite classification of products. First, the database fields are: id ----------product primary key id fid ---------- product parent id name -------- --The final output array format of the product name is complex

7.

Delete the first 100 pieces of data and sort them according to the primary key ID.

Introduction: Delete the first 100 pieces of data and sort them according to the primary key ID.

8.

zend gets the ID of inserted data solution

Introduction: zend Gets the ID of inserted data. How to get the primary key id value of a piece of data just inserted? ------Solution--------------------$lastid=$db->lastInsertId(); This way you can get the latest id value ------Solution--------------------Discuss how to obtain the primary key id value of a piece of data just inserted? ------Solution-------

9. Another problem, the data is somewhat connected, but it is difficult to find a solution

Introduction: Another problem, the data is somewhat related, but it is not easy to query a table with n fields, among which the primary key id and then there is an array $arr=array in the php code ( array('id'=>'5','num'=>100), array('id'=>'11','num'=>99), array('id'=> ;'3','nu

10. Why is my php inserting two identical data at a time into mysql

Introduction: Why does my PHP insert two pieces of the same data into MySQL at one time? Every time I submit it, the database inserts two pieces of the same information. My primary key ID is set to auto-increment. The problem seems to occur here. When I insert the value of the id on the php page, I click submit. At this time, mysql just inserts a message. I am just learning php and I am confused! I hope all the heroes passing by can help me! Thank you very much! if($_POST['submit']){mys

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