Function validate_connection_string 

pub fn validate_connection_string(url: &str) -> Result<()>

Validate a PostgreSQL connection string

Checks that the connection string has proper format and required components:

• Starts with “postgres://” or “postgresql://”
• Contains user credentials (@ symbol)
• Contains database name (/ separator with at least 3 occurrences)

Arguments

• url - Connection string to validate

Returns

Returns Ok(()) if the connection string is valid.

Errors

Returns an error with helpful message if the connection string is:

• Empty or whitespace only
• Missing proper scheme (postgres:// or postgresql://)
• Missing user credentials (@ symbol)
• Missing database name

Examples

// Valid connection strings
validate_connection_string("postgresql://user:pass@localhost:5432/mydb")?;
validate_connection_string("postgres://user@host/db")?;

// Invalid - will return error
assert!(validate_connection_string("").is_err());
assert!(validate_connection_string("mysql://localhost/db").is_err());