the newly installed mysql5.7.24 of rpm under the official website can be connected and queried normally by command on different machines, but there is a problem when connecting with the Navicat for Mysql tool. No less than 6 methods have been found on t...
whether you use slice or limit offset to do paging, there will be problems as long as you sort and then paginate. Why? there is a problem when PS: only shows that the amount of data per page is less than the total amount of data. Why? result = session...
I need to convert a string of xml data or json data into a tabular form in mysql. the json_extract function can only deal with a single json data, but not the json array. The data taken by the ExtractValue function are spliced together. I don t know h...
problem description there is a list that is incremented from time to time. Every day, the data in the list should be queried on a website to check whether the data appears on a website and record the results every day. At least the query results in th...
find the easiest way to read all the data from the database in dictionary format, and then insert the database with the same structure. 1 21020-30 3insert into table () values 4thinkphp $sql->data($arr)->add(); python ...
problem description I installed the general operation of MySQL, with docker, but when I deleted part of the data to optimize storage, after executing the optimize command, the container closed unexpectedly. I tried it twice and encountered the same si...
SELECT * FROM `t_test` WHERE ( `pid` IN ( SELECT id FROM `t_test` WHERE `pid` = 1 AND type = 1 ) AND type = 2 ) OR ( `pid` = 1 AND type = 2 ) the structure of the data table is as follows: ? :INSERT INTO agent.t_test (id, pid, type) V...
Table A < table > < thead > < tr > < th align= "left " > id < th > < th align= "left " > column1 < th > < th align= "left " > column2 < th > < tr > < thead > < tbody > < tr > < td align= "left " > 1 < td > < td align= "left " > a < t...
scene I link to the database in three ways: first: use .connect () .end () . Continuous requests can be made for the first time, and then there will be ups and downs second: do not use .connect () .end () . Continuous requests. All request...
use sql to query the database, and if there is no data in the field, set the data in the field to a certain value? How to write such sql ? ...
Navicat is connected to the database of the real server and has all the permissions to add, delete, modify and check. First ask the bosses if there is any way not to change the permissions of users in the database on the server side, but to limit their p...
problem description mysql query time is too long the environmental background of the problems and what methods you have tried after adding the index of the data table, the time is shortened a lot, but it is still not very ideal related codes SEL...
did not write the stored procedure of mysql, ask for guidance, thank you very much! ...
problem description mysql 5.7use database prompts you to add the-A parameter to the mysql 5.7 just installed in the centos7 under the virtual machine , and that s it the environmental background of the problems and what methods you have tried ...
Local mysql has been initialized. If you don t know how to handle this, ask for advice. ...
< H1 > as shown in the title: < H1 > EXPLAIN execution Plan: the following is my table structure. It takes 7 seconds to query more than 10, 000 pieces of data. CREATE TABLE order_copy ( id bigint (20) NOT NULL AUTO_INCREMENT, seq_id bigint...
define association: Theme.belongsToMany(Product,{through:theme_product,foreignKey: theme_id }) Product.belongsToMany(Theme,{through:theme_product,foreignKey: product_id }) theme_product is the intermediate table error message: throw new ...
above, I don t know why the normal sentence was changed to the second field . $temp = implode( , ,$temp); $field = comment.*,u.username,moment.moment_content,reply_comment.comment_content as reply_content, ; $field .= "(select count(r...
< H2 > there is a problem installing the mysql_fdw extension on postgresql. I don t know how to fix it. < H2 > Development environment: windows 7 postgresql 10.4 mysql 5.7.17 statement to install the extension: create extension mysql_fdw ...
<?php header("content-type:text html;charset=utf-8"); $conn=mysql_connect( localhost , root , root ) or die( ! ); mysql_select_db( student ); mysql_query( set names utf8 ); $rs=mysql_query("select * from stu_grade"); e...
in the environment built with umi+dva, there is a JSON file in the directory, which cannot be accessed by axios request, and all html files are returned ...
in the chooseImage callback, writeFile, put the picture path setData, in the writeFile callback. As a result, the wxml is indeed set to the path, but the picture does not display ...
only positive integers can be entered according to the keypress event, monitor the keyboard keyCode code, combined with the numeric regular expression to determine whether the typed keyCode is a number, if it is non-numeric, call the preventDefault e...
is to use c:forEach to view the result set in the database on the jsp page. The background output has a value, and there is also a value in HTML, but it is not possible to put it in jquery. this is what it used to be: $( document ).ready( function() {...
problem description official example: https: echarts.baidu.com exa... adds the following attributes to the xAxis attribute on the above example. None of them will take effect. It is not valid in the project either. nameGap: 100, nameTextStyle: { ...