转到Sql Server数据库驱动程序。-Golang开发

## 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.