SQL Server ODBC

• This is a V wrapper of SQL Server ODBC C/C++ library

Dependencies

• ODBC C/C++ library
  • Linux Install:
    • Details: https://docs.microsoft.com/en-us/sql/connect/odbc/linux-mac/installing-the-microsoft-odbc-driver-for-sql-server
    • msodbcsql17 and unixodbc-dev packages are needed
  • Windows Install:
    • odbc lib is included in windows sdk for most of distributions, so there is no need to install it separately
    • Details: https://docs.microsoft.com/en-us/sql/connect/odbc/microsoft-odbc-driver-for-sql-server

Windows Notes

Using msvc

• Make sure cl.exe of msvc is accessible from command line. You can run v commands in Visual Studio 2019 Developer Command Prompt to be safe.
• C Headers and dlls can be automatically resolved by msvc.

Using tcc

• Copy those headers to @VEXEROOT\thirdparty\mssql\include. The version number 10.0.18362.0 might differ on your system. Command Prompt commands:

copy "C:\Program Files (x86)\Windows Kits\10\Include\10.0.18362.0\um\sql.h" thirdparty\mssql\include
copy "C:\Program Files (x86)\Windows Kits\10\Include\10.0.18362.0\um\sqlext.h" thirdparty\mssql\include
copy "C:\Program Files (x86)\Windows Kits\10\Include\10.0.18362.0\um\sqltypes.h" thirdparty\mssql\include
copy "C:\Program Files (x86)\Windows Kits\10\Include\10.0.18362.0\um\sqlucode.h" thirdparty\mssql\include
copy "C:\Program Files (x86)\Windows Kits\10\Include\10.0.18362.0\shared\sal.h" thirdparty\mssql\include
copy "C:\Program Files (x86)\Windows Kits\10\Include\10.0.18362.0\shared\concurrencysal.h" thirdparty\mssql\include

• dlls can be automatically resolved by tcc

TODO

• Support Mac
• Support ORM

Usage

import mssql

fn test_example() ? {
    // connect to server
    config := mssql.Config{
        driver: 'ODBC Driver 17 for SQL Server'
        server: 'tcp:localhost'
        uid: '<your username>'
        pwd: '<your password>'
    }

    mut conn := mssql.Connection{}

    conn.connect(config.get_conn_str())?

    defer {
        conn.close()
    }

    // get current db name
    mut query := 'SELECT DB_NAME()'
    mut res := conn.query(query)?
    assert res == mssql.Result{
        rows: [mssql.Row{
            vals: ['master']
        }]
        num_rows_affected: -1
    }
}

struct Config {
pub:
	driver string
	server string
	uid    string
	pwd    string
// if dbname empty, conn str will not contain Database info,
// and it is up to the server to choose which db to connect to.
	dbname string
}

fn (cfg Config) get_conn_str() string

struct Connection {
mut:
	henv C.SQLHENV = C.SQLHENV(C.SQL_NULL_HENV) // Environment
	hdbc C.SQLHDBC = C.SQLHDBC(C.SQL_NULL_HDBC) // Connection handle
pub mut:
	conn_str string
}

fn (mut conn Connection) connect(conn_str string) ?bool

connect to db

fn (mut conn Connection) close()

close - closes the connection.

fn (mut conn Connection) query(q string) ?Result

query executes a sql query

struct Result {
pub mut:
	rows []Row
// the number of rows affected by sql statement
	num_rows_affected int
}

struct Row {
pub mut:
	vals []string
}