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https://github.com/nikolasburk/devbook-snippets
https://github.com/nikolasburk/devbook-snippets
Last synced: 25 days ago
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- Host: GitHub
- URL: https://github.com/nikolasburk/devbook-snippets
- Owner: nikolasburk
- Created: 2022-12-19T17:48:13.000Z (almost 2 years ago)
- Default Branch: main
- Last Pushed: 2022-12-19T19:59:46.000Z (almost 2 years ago)
- Last Synced: 2024-10-02T17:21:12.205Z (about 1 month ago)
- Language: JavaScript
- Size: 27.3 KB
- Stars: 0
- Watchers: 2
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
# Simple TypeScript Script Example
This example shows how to use [Prisma Client](https://www.prisma.io/docs/reference/tools-and-interfaces/prisma-client) in a **simple TypeScript script** to read and write data in a SQLite database. You can find the database file with some dummy data at [`./prisma/dev.db`](./prisma/dev.db).
## Getting started
### 1. Download example and install dependencies
Download this example:
```
npx try-prisma --template typescript/script
```
Install npm dependencies:
```
cd script
npm install
```
Alternative: Clone the entire repo
Clone this repository:
```
git clone [email protected]:prisma/prisma-examples.git --depth=1
```
Install npm dependencies:
```
cd prisma-examples/typescript/script
npm install
```
### 2. Create the database
Run the following command to create your SQLite database file. This also creates the `User` and `Post` tables that are defined in [`prisma/schema.prisma`](./prisma/schema.prisma):
```
npx prisma migrate dev --name init
```
### 3. Run the script
Execute the script with this command:
```
npm run dev
```
## Evolving the app
Evolving the application typically requires two steps:
1. Migrate your database using Prisma Migrate
1. Update your application code
For the following example scenario, assume you want to add a "profile" feature to the app where users can create a profile and write a short bio about themselves.
### 1. Migrate your database using Prisma Migrate
The first step is to add a new table, e.g. called `Profile`, to the database. You can do this by adding a new model to your [Prisma schema file](./prisma/schema.prisma) file and then running a migration afterwards:
```diff
// schema.prisma
model Post {
id Int @default(autoincrement()) @id
title String
content String?
published Boolean @default(false)
author User? @relation(fields: [authorId], references: [id])
authorId Int
}
model User {
id Int @default(autoincrement()) @id
name String?
email String @unique
posts Post[]
+ profile Profile?
}
+model Profile {
+ id Int @default(autoincrement()) @id
+ bio String?
+ userId Int @unique
+ user User @relation(fields: [userId], references: [id])
+}
```
Once you've updated your data model, you can execute the changes against your database with the following command:
```
npx prisma migrate dev
```
### 2. Update your application code
You can now use your `PrismaClient` instance to perform operations against the new `Profile` table. Here are some examples:
#### Create a new profile for an existing user
```ts
const profile = await prisma.profile.create({
data: {
bio: "Hello World",
user: {
connect: { email: "[email protected]" },
},
},
});
```
#### Create a new user with a new profile
```ts
const user = await prisma.user.create({
data: {
email: "[email protected]",
name: "John",
profile: {
create: {
bio: "Hello World",
},
},
},
});
```
#### Update the profile of an existing user
```ts
const userWithUpdatedProfile = await prisma.user.update({
where: { email: "[email protected]" },
data: {
profile: {
update: {
bio: "Hello Friends",
},
},
},
});
```
## Switch to another database (e.g. PostgreSQL, MySQL, SQL Server, MongoDB)
If you want to try this example with another database than SQLite, you can adjust the the database connection in [`prisma/schema.prisma`](./prisma/schema.prisma) by reconfiguring the `datasource` block.
Learn more about the different connection configurations in the [docs](https://www.prisma.io/docs/reference/database-reference/connection-urls).
Expand for an overview of example configurations with different databases
### PostgreSQL
For PostgreSQL, the connection URL has the following structure:
```prisma
datasource db {
provider = "postgresql"
url = "postgresql://USER:PASSWORD@HOST:PORT/DATABASE?schema=SCHEMA"
}
```
Here is an example connection string with a local PostgreSQL database:
```prisma
datasource db {
provider = "postgresql"
url = "postgresql://janedoe:mypassword@localhost:5432/notesapi?schema=public"
}
```
### MySQL
For MySQL, the connection URL has the following structure:
```prisma
datasource db {
provider = "mysql"
url = "mysql://USER:PASSWORD@HOST:PORT/DATABASE"
}
```
Here is an example connection string with a local MySQL database:
```prisma
datasource db {
provider = "mysql"
url = "mysql://janedoe:mypassword@localhost:3306/notesapi"
}
```
### Microsoft SQL Server
Here is an example connection string with a local Microsoft SQL Server database:
```prisma
datasource db {
provider = "sqlserver"
url = "sqlserver://localhost:1433;initial catalog=sample;user=sa;password=mypassword;"
}
```
### MongoDB
Here is an example connection string with a local MongoDB database:
```prisma
datasource db {
provider = "mongodb"
url = "mongodb://USERNAME:PASSWORD@HOST/DATABASE?authSource=admin&retryWrites=true&w=majority"
}
```
Because MongoDB is currently in [Preview](https://www.prisma.io/docs/about/releases#preview), you need to specify the `previewFeatures` on your `generator` block:
```
generator client {
provider = "prisma-client-js"
previewFeatures = ["mongodb"]
}
```
## Next steps
- Check out the [Prisma docs](https://www.prisma.io/docs)
- Share your feedback in the [`prisma2`](https://prisma.slack.com/messages/CKQTGR6T0/) channel on the [Prisma Slack](https://slack.prisma.io/)
- Create issues and ask questions on [GitHub](https://github.com/prisma/prisma/)
- Watch our biweekly "What's new in Prisma" livestreams on [Youtube](https://www.youtube.com/channel/UCptAHlN1gdwD89tFM3ENb6w)