Question 1

How to set up Prisma with an existing database?

Accepted Answer

Use the Prisma CLI to introspect your database and generate a schema, then configure the datasource in prisma.config.ts with your connection URL. You'll need to install Prisma Client and run `npx prisma generate` to create the type-safe client.

Question 2

Prisma vs Sequelize for TypeScript projects?

Accepted Answer

Prisma offers better type safety through code generation and a modern, schema-first approach, while Sequelize provides more flexibility with decorators and a traditional ORM style. Choose Prisma for automated type checking and Sequelize for more control over raw SQL.

Question 3

How to handle migrations in Prisma without data loss?

Accepted Answer

Use Prisma Migrate to create and apply declarative migration files, and always back up data before running migrations. The README recommends testing in staging and using shadow databases for validation to minimize risks.

Question 4

Does Prisma work well with MongoDB?

Accepted Answer

Prisma supports MongoDB but has limitations for advanced NoSQL features like complex aggregations, often requiring raw queries. It's best for basic CRUD operations in MongoDB, with type safety for defined schemas.

Question 5

How to optimize Prisma for serverless functions?

Accepted Answer

Use connection pooling via driver adapters, instantiate Prisma Client outside handler functions to reuse connections, and minimize client generation in cold starts by pre-building in deployment pipelines.

Question 6

Prisma client generation slow in CI/CD?

Accepted Answer

Speed up by caching the generated client output, using Docker multi-stage builds to separate generation from runtime, and ensuring all dependencies are pre-installed to avoid network delays during builds.

Question 7

How to use raw SQL queries with Prisma?

Accepted Answer

Prisma allows raw queries via methods like `$queryRaw` or `$executeRaw`, but these bypass type safety and require careful sanitization. Use them sparingly for unsupported operations, as mentioned in the docs for edge cases.

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