Asksearch_php.cn

Community Learn Tools Library Leisure

English

Popular searches：
PHP
MySQL
jquery
HTML
CSS

Improve performance of MYSQL queries with one-to-many relationships

I have a query in my database that takes 25 seconds to return results, which is too long. It seems like it should be pretty simple. Two tables; the main table (document) is a standard table with some data columns, and the connection table is a mapping table with only two columns (parent_id, division...

P粉993712159 2024-03-28 23:17:19

Pagination, can the data array queried using SQL statements be paginated? $list=query($sql); It seems that the paginate() method cannot be used

Can the data array queried using SQL statements be paginated? $list=query($sql); It seems that the paginate() method cannot be used

带砖侍卫 2018-03-26 23:56:10

Is there any way in Mysql to query a string inside another string?

Is there any way to query MySQL? For example, the string '3,5' is in the string '3,4,5,2'. The situation is probably like this. The user has multiple attributes, and the attribute ID is stored in a field in the user table, such as user_attr , the value storage format is: '3,4,5,2', explanation: for ...

ECHO 2020-01-02 10:44:28

SQL statement, how can we query the first word of this field in the data table through a Chinese character?

SQL statement, how can we query the first word of this field in the data table through a Chinese character?

rain 2020-02-16 10:45:14

PHP—Implementation of questionnaire survey function based on Yii2 framework

The questionnaire based on the Yii2 framework has three types of questions: single-choice, multiple-choice, and text input. How can these three functions be implemented using PHP language? I'm urgently looking for the answer, thank you!

紫颦晨曦 2019-08-22 17:41:19

gvim - Where can I find out which shortcut key combinations in vim are used by default and which ones are not used yet?

Where can I find out which shortcut key combinations in vim are used by default and which ones are not used yet? I wish there was a complete list, but I looked in the official manual and couldn't find it. It is best to use the gVim version under Windows environment. Thanks!

过去多啦不再A梦 2017-05-16 16:36:32

Possible revision title: "PHP SQL database update query issue: Index is not defined and data is not updated?"

I'm having trouble updating the database. I think the error is in the update query itself, but I'm very new to SQL and PHP so I'm not 100% sure. Any help would be greatly appreciated. I got an undefined index error, I fixed it but the problem still persists: $id=$_GET["id"];$listdate=isset...

P粉637866931 2024-04-02 18:46:20

javascript - How to optimize jquery loop append operation?

There is a page display function in the project. It is necessary to add canvas tags to the tags to which the specified class belongs. Because there is a query function, a corresponding number of canvas tags must be added according to the amount of data queried. I am now using a loop operation. First...

滿天的星座 2017-06-28 09:27:19

A connection interruption was encountered while executing a specific query

I'm getting a 2013LostConnectiontoMySQLserver message during a query to MySQL hosted on an AWS instance. The query below is the only one that causes this error (other queries run fine), and this query runs without issue on a Synology Docker container running MySQL. The only unique thing I found is t...

P粉148782096 2024-03-22 10:12:35

Implement filters and pagination using Laravel Eloquent

I'm trying to create an API that will return all customer records from a database. But this provides paging and filtering functionality. , the filter function is an optional query parameter. So it doesn't have to be included in the query parameters. But I'm having problems doing this. This is the in...

P粉010967136 2023-11-12 18:42:35

Query paging

Please tell me why when I click the next page for my paginated query, there are query results that appear? Pagination after query cannot be implemented

思睿 2018-10-18 10:49:05

Why is DESC command query slow on MariaDB

I have a query running against Maridb, when we query in ASC order, the optimizer checks less number of records (r_rows) and completes the query in about 500 ms, but when switching the order to DESC, the same query It takes more time to complete, r_rows is about 2.27 million. Why is this? Why does AS...

P粉127901279 2024-02-03 21:29:17

TP5.1 Implement search function in multi-table related query

Problems with the multi-table associated search function: The code is as follows: // Implement the search function $productName = Request::param('productName'); $storeName = Request::param('storeName'); if ( !empty($productName) &a

Jackie 2020-06-16 22:43:38

python - How to get information for a website without API?

If you want to make a website, the user enters query information on the website, and the background automatically inputs the information to the target website, and then obtains the query results of the target website and returns them to the user. Since the target website does not have an API, how ca...

某草草 2017-05-18 10:55:13

Is the WeChat QR code generation and usage function with scene parameters implemented?

The public account does not have the function of directly generating a parameter QR code. How can we generate this parameter QR code? The WeChat public account function implements #微信help channel QR code generation (generate parameter QR code, scan the code to reply, and data query statistics)

whb2010 2019-03-15 16:22:51

Use tools to generate posters with QR codes in WeChat?

Is there any WeChat third-party tool platform that can implement QR code posters with parameters, and can statistically query the effect of fans? Real-life technology or function #微信 Help Generate poster QR code, promoter QR code function print('')

whb2010 2019-03-12 14:30:52

How to merge two query results and display them on resource table in Laravel Nova

I'm trying to merge the results of two queries in LaravelNova. I've read the documentation but haven't found a solution yet. Basically, I want to merge two query results and display them in a resource table. I tried overriding the indexQuery method but failed. Refer to publicstaticfunctionindexQuery...

P粉755863750 2024-01-16 16:36:45

Looking for a data export after query in ThinkPhp 3.2

The student management system built using ThinkPhp 3.2 is always unable to export the queried data. What is exported is all the data, and the data exported by the sub-administrator is also all the data. The query at the front desk is appropriate but the export is inappropriate. Which one? The master...

为梦兼程 2019-04-20 10:40:12

How to select based on fields in JSON column using Doctrine query builder

I have a table with a JSON column of type longtext(DC2Type:json). The table has an entity in DoctrineORM in my Symfony project. I want to make a query based on a field within a JSON column using the Doctrine query builder in the variable $qb. How can I do this? Everything I've found online says to i...

P粉423694341 2024-01-06 16:58:30