as shown in the figure, a simple add and query operation takes up to 1 second [environment: windows + python3 + django2]. (the amount of data in PS: is not much, and todo_list has only 2 rows of data, which is still so slow.) def get(request): -...
because batch update operations are always involved recently, I don t know if batch operations can be performed, so we can only update, one by one in the loop , so I d like to ask whether there is a sql statement in the sql database that enables updat...
here s the thing. I have a table called list, and the fields used in this operation are updated_at and grab. updated_at is the last update time. grab represents whether the information is crawled or not. A value of 1 means it is crawled, and a value ...
1. Do you need a framework? the framework loads too many files by default, which hinders performance . two The framework comes with interface verification (to prevent arbitrary calls), version management (APP version upgrade is fast), etc., if there is ...
the data format in the table is as follows 2018-01-01 58 2018-01-01 12 2018-01-02 54 2018-01-02 24 2018-01-01 36 2018-01-03 3 10 the data format after query is as follows 2018-01-01 9 16 2018-01-02 7 8 2018-01-03 3 10 could you tell me how...
there are two insert statements in the mysql trigger. How to implement the second inert with the result of the first insert DELIMITER $$ USE `nightclub`$$ DROP TRIGGER *!50032 IF EXISTS * `create_histroy_room_statuses`$$ CREATE *!50017 DEFIN...
recently, when I was writing a node project, I found that it was troublesome to write a bunch of sql statements when connecting to mysql with node.js. I went to npm s official website to search for nothing, so I would like to ask if there is a similar f...
tb_user (user information) id tb_article (article information) id, foreign key user_id-> tb_user.id tb_comment (comment information) id, foreign key user_id-> tb_user.id query the top 5 users of the latest article or comment. order by tb_article.cre...
this is a function of asking and answering questions questions asked by users in Table A questions answered by users in Table B Table An is the only question corresponding to ID, Table B PID corresponds to Table An ID users answer which question PI...
I want to find out how to change all the primaryKey, of a table ...
as shown in the figure, every time I create data, it returns at a strange time adding this has no effect timezone: +08:00 ...
php calls the stored procedure, and there is other execution code before and after the stored procedure, in the same transaction, but the code before and after the stored procedure is executed, but the code in the stored procedure is not executed. What i...
The basic logic of the program is as follows: execute "LOCK TABLES auto_table WRITE "; then "select ID from auto_table; then update ID+1 " UPDATE auto_table set ID=ID+1 "; finally execute " UNLOCK TABLES " but this logic occurs when two users r...
I have a vegetable chicken at the front end. Recently, there is a new demand for the company s project, which has been maintained by others before. the front end uses a framework built by pHp and uses the memcached plug-in. After the project runs, ,...
is there no mysql in the service list? What s going on? It has happened many times that the command line cannot start mysql, and I am speechless every time I reinstall mysql,. I have tried all the answers on the Internet, but I can t solve them at all....
ask God to help me translate this native SQL statement into TP5 thank you! It is Db:: ( name )-> this kind of chained operation select a.id, a.titlerect a. Createwriting time as answer_count from fa_question a. Isometric solvepaper count (b.qid) as ...
for example, if the database has a field type of enum ( axiomagementific database ), can you change this field to enum when there are millions of data in the database? will it be slow? ...
I want to do a circular sequence to output pictures. Don t know how to write this code? Table structure for example, now the field ID of key=1 is 1, 2, 5, 7, 10, 11, 6 fields I want to output one at a time in order. output id 1 field for t...
Master and Slave built by mysql5.6, the newly created table is not backed up to the slave library master and slvae data can both correspond to can t the test library be automatically backed up to the slave library when establishing a master-slav...
mybatis+mysql for java projects int batchAmount = 20000; for (int startIndex = 0; startIndex < size; startIndex += batchAmount) { int endIndex = startIndex + batchAmount; endIndex = (endIndex &...
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1, now calling background API in the page needs to verify the validity of token, so use the following generation to encapsulate axios. When the token expires or expires, a pop-up window prompts the user to click re-login to return to the login interface...
what are the specific uses and uses of these two methods? I checked Baidu and said it could rotate and correct the picture. I tried to feel that there was no difference between the two methods. The following is my code. I don t know if it s wrong. ...
my Cookie goes like this: cookie={"key":"V0tRTVF=","uid":"2","username":""} I want PHP to accept these parameters. According to reason, PHP backend to obtain, and then transfer the code can b...
as mentioned in the question, 20:00 Beijing time (UTC+8) on Friday is a time point, how to calculate the hours and seconds of each time zone ending Beijing time (UTC+8) at 20:00 on Friday? For example, what are the minutes and seconds when people are in ...