https://github.com/devgametools/entity_framework
ENTITY FRAMEWORK PRACTICE (C# - .NET)
https://github.com/devgametools/entity_framework
Last synced: 4 months ago
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ENTITY FRAMEWORK PRACTICE (C# - .NET)
- Host: GitHub
- URL: https://github.com/devgametools/entity_framework
- Owner: Devgametools
- Created: 2025-01-15T13:18:01.000Z (5 months ago)
- Default Branch: main
- Last Pushed: 2025-01-21T04:36:33.000Z (5 months ago)
- Last Synced: 2025-02-05T16:44:46.833Z (5 months ago)
- Language: C#
- Size: 20.5 KB
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: Readme.md
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README
# Entity Framework Core
## Create a new project
```bash
# Create a new project in the current directory
dotnet new web
```
## Add Entity Framework Core and Utils
```bash
# Add Entity Framework Core
dotnet add package Microsoft.EntityFrameworkCore
dotnet add package Microsoft.EntityFrameworkCore.InMemory
dotnet add package Npgsql.EntityFrameworkCore.PostgreSQL
```
## Install PostgreSQL
### Install PostgreSQL on Windows
1. Download the installer from [here](https://www.enterprisedb.com/downloads/postgres-postgresql-downloads)
2. Run the installer and follow the instructions
3. Open the PostgreSQL command line tool by searching for it in the Start menu
4. Create a new user by running the following command:
```bash
createuser -P -s -e username
```
### Install PostgreSQL on Linux
1. Install PostgreSQL by running the following command:
```bash
sudo apt-get install postgresql
```
2. Create a new user by running the following command:
```bash
sudo -u postgres createuser -P -s -e username
```
4. Exit the PostgreSQL command line tool by pressing Ctrl + D
## Install dotnet-ef
1. Install dotnet-ef by running the following command:
```bash
dotnet tool install --global dotnet-ef
dotnet add package Microsoft.EntityFrameworkCore.Design --version 9.0.1
```
2. Verify the installation by running the following command:
```bash
dotnet ef --version
```
3. Create a new migration by running the following command:
```bash
dotnet ef migrations add InitialCreate --context TaskContext
```
4. Apply the migration by running the following command:
```bash
dotnet ef database update
```
5. Run the application by running the following command:
```bash
dotnet run
```
# Some useful commands for PostgreSQL prompt
## Create a new database
```bash
createdb -U username DatabaseName
```
## Create a new user
```bash
createuser -P -s -e username
```
## Create a new table
```bash
CREATE TABLE Categories (
CategoryId UUID PRIMARY KEY,
Name VARCHAR(150) NOT NULL,
Description VARCHAR(500)
);
```
## Command Prompt of PostgreSQL
```bash
psql -U username -d DatabaseName
```
## Create a new column
```bash
ALTER TABLE Categories ADD COLUMN Description VARCHAR(500);
```
## Delete a column
```bash
ALTER TABLE Categories DROP COLUMN Description;
```
## Delete a table
```bash
DROP TABLE Categories;
```
## Delete a database
```bash
dropdb -U username DatabaseName
```
## Delete a user
```bash
dropuser -U username username
```
## List all databases
```bash
\l
```
## List all tables
```bash
\dt
```
## List all columns
```bash
\d Categories
```
## List only the column names
```bash
SELECT column_name
FROM information_schema.columns
WHERE table_schema = 'public'
AND table_name = 'Name_of_the_table';
```
## List all rows
```bash
SELECT * FROM Categories;
```
## Insert a row
```bash
INSERT INTO Categories (Name, Description) VALUES ('Category Name', 'Category Description');
```
## Update a row
```bash
UPDATE Categories SET Name = 'New Category Name' WHERE CategoryId = '00000000-0000-0000-0000-000000000000';
```
## Delete a row
```bash
DELETE FROM Categories WHERE CategoryId = '00000000-0000-0000-0000-000000000000';
```