Trying to list a collection of Firestore databases

I want to list Firestore database collection inside Ionic4 application so I am using the documentation from listCollection section so I applied the sample code in my code: this.afs.firestore.listCollections().then(collections=>{for( letcollectionofcollections){console.log(`Foundcollectionwithid:$...

P粉546179835 2023-08-24 23:19:00 0  1  557

When will the PHP Chinese website change the database integrated with the PHP toolbox to MySQL5.6?

When will the PHP Chinese website change the database integrated with the PHP toolbox to MySQL5.6?

Dumbo 2019-05-15 03:03:50 0  2  1014

PHP class interface technology (interface)

Interface Technology What is an interface? Look at the "development history" of interfaces: Class --> Abstract class --> Some kind of "structural form" that is more abstract than abstract class: interface; Interface: with

A-王青召 2018-11-14 15:49:57 0  0  1117

Does jdbcTemplate support mapping of complex objects?

{Code...} Can you use jdbcTemplate to map the result set into the above complex objects (that is, an object is also associated with an object or a collection of objects)? If you don't use mybatis or hibernate, is there any other way to facilitate mapping?

PHPz 2017-05-17 09:58:27 0  1  723

java - How to use HQL to filter out entities with collection attributes

For example, the entity User contains the nicknames attribute of Set<String>. There are n User objects, and one of the User's nicknames collection contains "admin". How to write HQL to return the User entity whose nicknames collection contains "admin"?

曾经蜡笔没有小新 2017-05-17 10:07:08 0  1  865

如何实现将 MongoDB中group分组后的结果，再存入到mongo数据库中？？？？

先通过mongo中的聚合函数：group（）后返回的是DBObject 对象，我想将其存入另一个集合中，怎么办？？？

过去多啦不再A梦 2017-04-24 15:59:32 0  2  780

Arrays in PHP: surprising results when adding new items

So I'm writing code that allows me to collect images collected by the Instaloaderpython library and put them into a gallery on my website. I've managed to collect and display these without any problems, however I've now started implementing headers for each post and I'm running into issues. The way ...

P粉893457026 2024-03-31 14:10:42 0  1  517

Shopware 6, abstract classes and dependency injection in Symfony

Currently I am developing a Shopware6 extension based on Symfony. What I don't understand is how to implement abstract classes and dependency injection. So I want to be able to refactor the code and use these methods often, but in another context (using another repository) <?phpdeclare(strict_typ...

P粉680087550 2024-01-09 08:44:57 0  1  511

How to represent inheritance in database?

I'm thinking about how to represent complex structures in a SQLServer database. Consider an application that needs to store details about a series of objects that share some properties but have many other uncommon properties. For example, a business insurance package might include liability, motor, ...

P粉041856955 2023-08-29 13:56:14 0  2  582

Retrieve documents in a nested collection

I'm working on a React project in which I want to list documents for logged in users. The structure is as follows, the document I want to read is in the collection. The database structure is as follows: users (collection)->user (document)->repos (collection)->repo (document)->files (coll...

P粉682987577 2024-03-22 13:50:45 0  1  1103

How to justify abstract text in quarto?

I'm currently writing a paper for academic purposes, and naturally, I added an abstract using the abstract option in the YAML header. I know you can use the following code (see below) to align the text in the quarto, but this doesn't seem to work with the alignment of the text in the summary itself....

P粉724737511 2023-08-31 12:43:58 0  1  534

"Warning: Async stack trace in Node.js debugger"

I'm trying to insert a document into my MongoDB collection. However, when I ran the program in the VS Code IDE, I encountered the following error: MongoDB URL: "mongodb://localhost:27017/". I also encountered the same error when I tried to create a new collection in MongoDB's local databas...

P粉138871485 2023-07-28 17:05:10 0  1  574

How to build cross database query in PHP?

In our last episode (How to Build Cross-Database Queries in MySQL), I learned how to build cross-database queries in MySQL. This worked great, but when our hero tried to use this newfound knowledge in PHP, he found that his best friend failed. I looked into PHP's mysql_select_db. This seems to mean ...

P粉197639753 2023-10-22 11:40:00 0  2  682

How to use mysqli to determine whether a MySQL database exists in PHP?

How to use the mysqli statement in PHP to accurately determine whether a MySQL database exists? In addition, how to determine whether a table in the database exists? In addition, what do the two styles provided in the official PHP documentation mean? Object-oriented style and process-oriented style....

淡淡烟草味 2017-06-14 10:49:52 0  1  1061

Wrong use of MySQL SELECT INNER JOIN

I'm trying to retrieve the set of "roles" given users.id using a query using INNERJOIN combined with a WHERE condition. But something went wrong. My database has four tables: t_users:id,username,userpass,status,...t_action:id,id_user,id_role,id_type_role,...t_role:id,libelle,statust_type_r...

P粉022285768 2024-02-25 22:06:14 0  2  430

java-ee - java8的Collectors.reducing(）

{Code...} Probably I want to group the operationInfos collection according to the cityId in it, and then if the cityId is the same, add the SurgeryCount of the object and return it, but now the first v1 is null, execute v1.setSurgeryCount(v1. getSurgeryCount() + v2.g...

三叔 2017-07-03 11:43:35 0  1  1320

angular.js - How to write recursion in JS or angular?

As shown in the figure, it is an object. Each child node has an array of children. The arrays are all combinations of objects in this pattern. The lowest children.length=0. I need to add objects to a collection according to the nodes in sequence, such as angular's $scope.list=[]; This is what I am n...

怪我咯 2017-05-15 17:04:23 0  1  524

Database connection error php Server doesn't have mysql moudle loaded

1. Using the integrated environment: phpstudy 8.1, when establishing a database connection in Dreamweaver cs6, the following error message pops up: PhP Server doesn't have the mysql module loaded or you can't&n

董智勇 2020-02-27 16:00:44 0  0  1172