Module sqlserver 

The SQL Server driver, implemented directly on TDS 7.4.

TDS — the Tabular Data Stream — is written here from Microsoft’s published MS-TDS specification: the packet framing, the pre-login exchange, LOGIN7, SQLBatch, RPC and the token stream that comes back. Nothing is borrowed from an existing client, and nothing goes through ODBC.

Three things separate this from the PostgreSQL driver next door:

• Encryption is negotiated inside the handshake. The TLS records are tunnelled through TDS packets until the handshake completes. auth documents that in full, because it is the part that surprises everyone.
• Parameters travel as arguments to a stored procedure. Every parameterised statement is sent as an RPC call to sp_executesql, with the statement text and a declaration list as its first two arguments. A bound value is never part of the SQL text, so it can never become SQL.
• Values arrive in binary. types owns a decoder per type, where the PostgreSQL driver asks the server for text.

Authentication

SQL Server authentication only — a username and a password. Windows integrated authentication (NTLM, Kerberos, SSPI) and Entra federated authentication are not implemented, and a server that demands one of them is told so by name.

Re-exports

pub use auth::Encryption;

pub use auth::TlsOptions;

pub use connection::SqlServerConnection;

pub use connection::SqlServerDriver;

pub use connection::SqlServerOptions;

Modules

auth

SQL Server authentication, and the TLS that has to happen first.

connection

A single SQL Server connection.

protocol

TDS — the Tabular Data Stream protocol SQL Server speaks.

types

TDS types: reading COLMETADATA and rows into Value, and encoding bound parameters on the way out.