My code contains a head file redis.h and a c++ source file redis.cpp. This is a demo of sadd opeaion in redis. All the operations fail, becase of WRONGTYPE Operation against a key holding the wrong kind of value. I don’t know what happened. Please give me some suggestions. //redis.h #ifndef _REDIS_H_ #define _REDIS_H_ #include ..
Category : database
I am following the step-by-step example from https://firebase.google.com/codelabs/firebase-android. I am trying to start the emulator from the terminal (in Windows) with firebase emulators:start or with firebase emulators:start –project=demo-friendlychat-android, but I always get the error Error: TIMEOUT: Port 9000 on localhost was not active within 60000ms. How can I resolve? Source: Windows..
Qt 5.15.2 (Linux) DB: PostgreSQL 13 (Linux) Updating a DB record using QSqlTableModel setData returns false on a second row. A query on the model’s lastError returns an empty string. Table preparation: create table email (nr integer NOT NULL,id serial primary key,priority integer not null,address varchar(100)) insert into email (nr, priority, address) values (358, 1, ..
I have a simple question. Is it possible to make a notes app that works on my phone and also pc? I mean it like I can add a note on my pc and i could see the same note on my phone. If it is possible, how? Thanks for your answers. Source: Windows..
I want to automate uploading certain files into my SQL Server every day, but each file has a different name. I was researching and found a simple way was to schedule a bulk insert statement to run every day, but I don’t know how to implement the file name change in the query. I’m not ..
A list contains thousands of strings, and each string should be unique. In my opinion, when a new string is added that list, the string is firstly compared with others, than added if not exists. I know, it can be implemented by a set() in C++. But when the set contains millions of strings, we ..
I just got into programming and was doing a fun little exercise in c++ ( a login app using .dat’s as a database ) and ran into a problem. Is there any way to create a "string named file" in a specific directory? I’ve seen that ones can create both a string named file and ..
I have attached picture of this question and I’m trying to solve this question but I get stuck can anyone who can help me out to solve this problem. Source: Windows Que..
There are 3 parts to the system: A mobile application(Android app written in Kotlin) with a local storage that will be used to add, update, and query data from the remote sql server when synced. A desktop application(Windows written with Electron) with a local storage that will be used to add, update, remove, and query ..
I have a cloud database with Oracle and I’m trying to learn how to execute SQL commands within my c++ application. Here’s what I’ve tried. 1) Using Instant Client (OCCI) I have tried to follow these docs posted by Oracle I downloaded instant client, unzipped, and put it under the directory called Oracle I downloaded ..
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