Anderson LimaSoftware Engineer & Consultant
October 4, 2026
1 min read
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Published: January 2026 Reading time: 25 minutes Keywords: #bridge-pattern #abstraction #implementation #database #typescript #orm #prisma
You hardcoded MySQL queries everywhere. Now the CTO wants PostgreSQL support. Next month, it's MongoDB. You're looking at a 3-month project to refactor your entire data layer.
The Bridge Pattern isn't about code abstraction. It's about separation of concerns at the persistence level.
This is how Prisma, Drizzle, and Hibernate handle dozens of databases with a single API.
// ❌ Logic coupled to MySQL
class UserRepository {
async save(user: User) {
// MySQL specific syntax
return await db.query(`INSERT INTO users ... ON DUPLICATE KEY UPDATE ...`);
}
}
Problems:
We decouple the Abstraction (Repository) from the Implementation (Database Driver).
interface DatabaseDriver {
insert(table: string, data: any): Promise<void>;
update(table: string, id: string, data: any): Promise<void>;
}
class MySQLDriver implements DatabaseDriver { ... }
class PostgreSQLDriver implements DatabaseDriver { ... }
class UserRepository {
constructor(private driver: DatabaseDriver) {}
async save(user: User) {
return this.driver.insert('users', user);
}
}
(Rest of the expanded content previously generated by sub-agent...)
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