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https://github.com/minus5/Gofreetds

Go Sql Server database driver.
https://github.com/minus5/Gofreetds

Last synced: 20 days ago
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Go Sql Server database driver.

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## gofreetds



Go [FreeTDS](http://www.freetds.org/) wrapper. Native Sql Server database driver.



Features:



  * can be used as [database/sql](http://golang.org/pkg/database/sql/) driver

  * handles calling [stored procedures](#stored-procedures)

  * handles multiple resultsets

  * supports database mirroring

  * connection pooling

  * scaning resultsets into structs



## Get started



### Install dependencines



[FreeTDS](http://www.freetds.org/) libraries must be installed on the system.



Mac

```shell

brew install freetds

```

Ubuntu, Debian...

```shell

sudo apt-get install freetds-dev

```



### Go get



```

go get github.com/minus5/gofreetds

```



### Docs



  http://godoc.org/github.com/minus5/gofreetds



## Using as database/sql driver



Name of the driver is mssql.

```go

db, err := sql.Open("mssql", connStr)

...

row := db.QueryRow("SELECT au_fname, au_lname name FROM authors WHERE au_id = ?", "172-32-1176")

..

var firstName, lastName string

err = row.Scan(&firstName, &lastName)

```

Full example in example/mssql.



## Stored Procedures



What I'm missing in database/sql is calling stored procedures, handling return values and output params. And especially handling multiple result sets.

Which is all supported by FreeTDS and of course by gofreetds.



Connect:

```go

pool, err := freetds.NewConnPool("user=ianic;pwd=ianic;database=pubs;host=iow")

defer pool.Close()

...

//get connection

conn, err := pool.Get()

defer conn.Close()

```

Execute stored procedure:

```go

rst, err := conn.ExecSp("sp_help", "authors")  

```

Read sp return value, and output params:

```go

returnValue := rst.Status()

var param1, param2 int

rst.ParamScan(&param1, &param2)

```

Read sp resultset (fill the struct):

```go

author := &Author{}

rst.Scan(author)

```

Read next resultset:

```go

if rst.NextResult() {

    for rst.Next() {

        var v1, v2 string

        rst.Scan(&v1, &v2)

    }

}

```

Full example in example/stored_procedure



## Other usage



Executing arbitrary sql is supported with Exec or ExecuteSql.



Execute query:

```go

rst, err := conn.Exec("select au_id, au_lname, au_fname from authors")

```

Rst is array of results.

Each result has Columns and Rows array.

Each row is array of values. Each column is array of ResultColumn objects.



Full example in example/exec.



Execute query with params:

```go

rst, err := conn.ExecuteSql("select au_id, au_lname, au_fname from authors where au_id = ?", "998-72-3567")

```



## Sybase Compatibility Mode



Gofreetds now supports Sybase ASE 16.0 through the driver. In order to support this, this post is very helpful: [Connect to MS SQL Server and Sybase ASE from Mac OS X and Linux with unixODBC and FreeTDS (from Internet Archive)](http://web.archive.org/web/20160325095720/http://2tbsp.com/articles/2012/06/08/connect-ms-sql-server-and-sybase-ase-mac-os-x-and-linux-unixodbc-and-freetds)



To use a Sybase ASE server with Gofreetds, you simply need to set a compatibility mode on your connection string after you've configured your .odbc.ini file and .freetds.conf file.



This mode uses TDS Version 5.



### Connection String Parameter



You can set your connection string up for Sybase by using the 'compatibility_mode' Parameter. The parameter can be named 'compatibility', 'compatibility mode', 'compatibility_mode' or 'Compatibility Mode'. Currently this mode only supports Sybase. To specify you can use 'sybase' or 'Sybase'.



```

Server=myServerAddress;Database=myDatabase;User Id=myUsername;Password=myPassword;Failover Partner=myMirror;Max Pool Size=200;Compatibility Mode=Sybase

```



## Testing



Tests depend on the pubs database.



Pubs sample database install script could be [downloaded](http://www.microsoft.com/en-us/download/details.aspx?id=23654).

After installing that package you will find

instpubs.sql on the disk (C:\SQL Server 2000 Sample

Databases). Execute that script to create pubs database.



Tests and examples are using environment variable GOFREETDS_CONN_STR to connect to the pubs database.



```shell

export GOFREETDS_CONN_STR="user=ianic;pwd=ianic;database=pubs;host=iow"

export GOFREETDS_MIRROR_HOST="iow-mirror"

```

If you don't want to setup and test database mirroring than don't define GOFREETDS_MIRROR_HOST. Mirroring tests will be skipped.