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 =...
new Vue({ el: -sharpapp , router, render: h =>h(Layout), template: <Layout > , components: { Layout } }) There is no difference between render: h = > h (Layout), and template: < Layout > . ...
has the following code. In my expectation, using two browser windows (A _ Magi B window) to access http: 127.0.0.1:8000 at the same time, the total time to wait for the two pages to load should be close to 10 seconds, but it actually takes 20 seconds,...
* * author: cw1997 a10702005 [changwei1006@gmail.com] * datetime: 2018-10-22 23:29:39 * -sharpinclude <iostream> -sharpinclude <ctime> -sharpinclude <cmath> void printarr(long n, long arr[]) { printf(" n"); for...
looked at the official documentation and didn t figure out what it is. What s the difference between it and the render attribute of Route? const OldSchoolMenuLink = ({ label, to, activeOnlyWhenExact }) => ( <Route path={to} exact={activeO...
introduce elementui and mintui, on demand, but both need to set how libraryName, should be written in babelrc ....