php reads the query result set with sqlsrv_fetch (). There are only three records in the table, but four times of fetch execution does not return false, but the fifth time returns false,. Why not false the fourth time (the test found that the fourth tim...
use leftJoin multi-table join lookup. Finally, a field in select is a field from count in one of the right tables, but if there is no count data in that table, the entire query will lose the result. Now you want to keep the data in the left table if the...
topic description after the connection pool connection is successful, the connection timed out when performing the database operation. How to configure to return an error directly instead of trying to reconnect all the time related codes const to =...
Front end: with regard to the question of the words on the progress bar, how does the color of the words change with the background color? ask for advice. Crab the specific effect is as follows: I mean, how to achieve the front end, ask for advic...
when optimizing PHP-FPM, there are usually two ways of thinking: setting pm.max_children, according to the number of CPU cores, such as * 2 + 2 cores, will pull the CPU very high, more than 70%, under the same pressure, but there is almost no fluctua...
navigator.geolocation.getCurrentPosition(successCallback); function successCallback(position){ var lat = position.coords.latitude; var long = position.coords.longitude; } var map; function initMap() { map = new goo...
< H2 > I know the process and basis of the three-way handshake. You don t have to explain the basic concepts to me < H2 > < hr > the question is why the second handshake cannot be done 1. The information sent from the client to the server is delaye...
topic description this code always prompts "basic connection is closed: error occurred while sending " related codes Please paste the code text below (do not replace the code with pictures) what result do you expect? What is the error mes...