Create Database

Create Database

Description:
Creates a new database entry in the catalog, persists the updated catalog to disk, and creates the corresponding database directory under database/base/.

Function:

pub fn create_database(
    catalog: &mut Catalog,
    db_name: &str,
) -> bool

Input:

• catalog — In-memory catalog containing all database metadata.
• db_name — Name of the database to create. Must be non-empty and unique.

Output:

• Returns true if the database was successfully created.
• Returns false if validation, catalog persistence, or directory creation fails.

Implementation:

1. Validate that db_name is not empty.
2. Check whether a database with the same name already exists in the catalog.
3. Create a new Database object with an empty table map.
4. Insert the database into catalog.databases.
5. Serialize the entire catalog to JSON using serde_json.
6. Persist the catalog to the catalog file (catalog.json).
7. Create the database directory:

   database/base/{db_name}/

   if it does not already exist.
8. Return true on success; otherwise return false if any validation, serialization, file write, or directory creation step fails.