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You want to load data from a PostgreSQL database using Langchain. Which connection string format is correct?

hard📝 Application Q8 of 15
LangChain - Document Loading
You want to load data from a PostgreSQL database using Langchain. Which connection string format is correct?
Amysql://user@localhost/mydatabase
Bsqlite:///mydatabase.db
Cpostgresql://user:password@localhost:5432/mydatabase
Dmongodb://user:password@localhost/mydatabase
Step-by-Step Solution
Solution:

  1. Step 1: Identify PostgreSQL connection string format

    PostgreSQL uses the format postgresql://user:password@host:port/database.

  2. Step 2: Compare options

    postgresql://user:password@localhost:5432/mydatabase matches PostgreSQL format; others are for SQLite, MySQL, or MongoDB.

  3. Final Answer:

    postgresql://user:password@localhost:5432/mydatabase -> Option C

  4. Quick Check:

    PostgreSQL connection string = postgresql://user:password@localhost:5432/mydatabase format [OK]
Quick Trick: Use correct DB prefix in connection string for each database type [OK]
Common Mistakes:
  • Using SQLite string for PostgreSQL
  • Confusing MySQL and PostgreSQL formats
  • Using MongoDB string for SQL databases

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