mssql

package module
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 Go to latest Published: Jul 6, 2022 License: BSD-3-Clause Imports: 36 Imported by: 0

README

A pure Go MSSQL driver for Go's database/sql package

Go Reference Build status codecov

Install

Requires Go 1.8 or above.

Install with go get github.com/FromPAUS/go-mssqldb .

Connection Parameters and DSN

The recommended connection string uses a URL format: sqlserver://username:password@host/instance?param1=value&param2=value Other supported formats are listed below.

Common parameters
  • user id - enter the SQL Server Authentication user id or the Windows Authentication user id in the DOMAIN\User format. On Windows, if user id is empty or missing Single-Sign-On is used. The user domain sensitive to the case which is defined in the connection string.
  • password
  • database
  • connection timeout - in seconds (default is 0 for no timeout), set to 0 for no timeout. Recommended to set to 0 and use context to manage query and connection timeouts.
  • dial timeout - in seconds (default is 15), set to 0 for no timeout
  • encrypt
    • disable - Data send between client and server is not encrypted.
    • false - Data sent between client and server is not encrypted beyond the login packet. (Default)
    • true - Data sent between client and server is encrypted.
  • app name - The application name (default is go-mssqldb)
Connection parameters for ODBC and ADO style connection strings
  • server - host or host\instance (default localhost)
  • port - specifies the host\instance port (default 1433). If instance name is provided but no port, the driver will use SQL Server Browser to discover the port.
Less common parameters
  • keepAlive - in seconds; 0 to disable (default is 30)
  • failoverpartner - host or host\instance (default is no partner).
  • failoverport - used only when there is no instance in failoverpartner (default 1433)
  • packet size - in bytes; 512 to 32767 (default is 4096)
  • log - logging flags (default 0/no logging, 63 for full logging)
    • 1 log errors
    • 2 log messages
    • 4 log rows affected
    • 8 trace sql statements
    • 16 log statement parameters
    • 32 log transaction begin/end
  • TrustServerCertificate
    • false - Server certificate is checked. Default is false if encypt is specified.
    • true - Server certificate is not checked. Default is true if encrypt is not specified. If trust server certificate is true, driver accepts any certificate presented by the server and any host name in that certificate. In this mode, TLS is susceptible to man-in-the-middle attacks. This should be used only for testing.
  • certificate - The file that contains the public key certificate of the CA that signed the SQL Server certificate. The specified certificate overrides the go platform specific CA certificates.
  • hostNameInCertificate - Specifies the Common Name (CN) in the server certificate. Default value is the server host.
  • ServerSPN - The kerberos SPN (Service Principal Name) for the server. Default is MSSQLSvc/host:port.
  • Workstation ID - The workstation name (default is the host name)
  • ApplicationIntent - Can be given the value ReadOnly to initiate a read-only connection to an Availability Group listener. The database must be specified when connecting with Application Intent set to ReadOnly.
The connection string can be specified in one of three formats

  1. URL: with sqlserver scheme. username and password appears before the host. Any instance appears as the first segment in the path. All other options are query parameters. Examples:

    • sqlserver://username:password@host/instance?param1=value&param2=value
    • sqlserver://username:password@host:port?param1=value&param2=value
    • sqlserver://sa@localhost/SQLExpress?database=master&connection+timeout=30 // `SQLExpress instance.
    • sqlserver://sa:mypass@localhost?database=master&connection+timeout=30 // username=sa, password=mypass.
    • sqlserver://sa:mypass@localhost:1234?database=master&connection+timeout=30 // port 1234 on localhost.
    • sqlserver://sa:my%7Bpass@somehost?connection+timeout=30 // password is "my{pass" A string of this format can be constructed using the URL type in the net/url package.
    
query := url.Values{}
query.Add("app name", "MyAppName")

u := &url.URL{
	Scheme:   "sqlserver",
	User:     url.UserPassword(username, password),
	Host:     fmt.Sprintf("%s:%d", hostname, port),
	// Path:  instance, // if connecting to an instance instead of a port
	RawQuery: query.Encode(),
}
db, err := sql.Open("sqlserver", u.String())

  2. ADO: key=value pairs separated by ;. Values may not contain ;, leading and trailing whitespace is ignored. Examples:

    • server=localhost\\SQLExpress;user id=sa;database=master;app name=MyAppName
    • server=localhost;user id=sa;database=master;app name=MyAppName

    ADO strings support synonyms for database, app name, user id, and server

    • server <= addr, address, network address, data source
    • user id <= user, uid
    • database <= initial catalog
    • app name <= application name

  3. ODBC: Prefix with odbc, key=value pairs separated by ;. Allow ; by wrapping values in {}. Examples:

    • odbc:server=localhost\\SQLExpress;user id=sa;database=master;app name=MyAppName
    • odbc:server=localhost;user id=sa;database=master;app name=MyAppName
    • odbc:server=localhost;user id=sa;password={foo;bar} // Value marked with {}, password is "foo;bar"
    • odbc:server=localhost;user id=sa;password={foo{bar} // Value marked with {}, password is "foo{bar"
    • odbc:server=localhost;user id=sa;password={foobar } // Value marked with {}, password is "foobar "
    • odbc:server=localhost;user id=sa;password=foo{bar // Literal {, password is "foo{bar"
    • odbc:server=localhost;user id=sa;password=foo}bar // Literal }, password is "foo}bar"
    • odbc:server=localhost;user id=sa;password={foo{bar} // Literal {, password is "foo{bar"
    • odbc:server=localhost;user id=sa;password={foo}}bar} // Escaped } with}}`, password is "foo}bar"
Azure Active Directory authentication

Azure Active Directory authentication uses temporary authentication tokens to authenticate. The mssql package does not provide an implementation to obtain tokens: instead, import the azuread package and use driver name azuresql. This driver uses azidentity to acquire tokens using a variety of credential types.

The credential type is determined by the new fedauth connection string parameter.

  • fedauth=ActiveDirectoryServicePrincipal or fedauth=ActiveDirectoryApplication - authenticates using an Azure Active Directory application client ID and client secret or certificate. Implemented using ClientSecretCredential or CertificateCredential
    • clientcertpath=<path to certificate file>;password=<certificate password> or
    • password=<client secret>
    • user id=<application id>[@tenantid] Note the @tenantid component can be omitted if the server's tenant is the same as the application's tenant.
  • fedauth=ActiveDirectoryPassword - authenticates using a user name and password.
    • user id=username@domain
    • password=<password>
    • applicationclientid=<application id> - This guid identifies an Azure Active Directory enterprise application that the AAD admin has approved for accessing Azure SQL database resources in the tenant. This driver does not have an associated application id of its own.
  • fedauth=ActiveDirectoryDefault - authenticates using a chained set of credentials. The chain is built from EnvironmentCredential -> ManagedIdentityCredential->AzureCLICredential. See DefaultAzureCredential docs for instructions on setting up your host environment to use it. Using this option allows you to have the same connection string in a service deployment as on your interactive development machine.
  • fedauth=ActiveDirectoryManagedIdentity or fedauth=ActiveDirectoryMSI - authenticates using a system-assigned or user-assigned Azure Managed Identity.
    • user id=<identity id> - optional id of user-assigned managed identity. If empty, system-assigned managed identity is used.
    • resource id=<resource id> - optional resource id of user-assigned managed identity. If empty, system-assigned managed identity or user id are used (if both user id and resource id are provided, resource id will be used)
  • fedauth=ActiveDirectoryInteractive - authenticates using credentials acquired from an external web browser. Only suitable for use with human interaction.
    • applicationclientid=<application id> - This guid identifies an Azure Active Directory enterprise application that the AAD admin has approved for accessing Azure SQL database resources in the tenant. This driver does not have an associated application id of its own.

import (
  "database/sql"
  "net/url"

  // Import the Azure AD driver module (also imports the regular driver package)
  "github.com/FromPAUS/go-mssqldb/azuread"
)

func ConnectWithMSI() (*sql.DB, error) {
  return sql.Open(azuread.DriverName, "sqlserver://azuresql.database.windows.net?database=yourdb&fedauth=ActiveDirectoryMSI")
}

Executing Stored Procedures

To run a stored procedure, set the query text to the procedure name:


var account = "abc"
_, err := db.ExecContext(ctx, "sp_RunMe",
	sql.Named("ID", 123),
	sql.Named("Account", sql.Out{Dest: &account}),
)

Reading Output Parameters from a Stored Procedure with Resultset

To read output parameters from a stored procedure with resultset, make sure you read all the rows before reading the output parameters:


sqltextcreate := `
CREATE PROCEDURE spwithoutputandrows
	@bitparam BIT OUTPUT
AS BEGIN
	SET @bitparam = 1
	SELECT 'Row 1'
END
`
var bitout int64
rows, err := db.QueryContext(ctx, "spwithoutputandrows", sql.Named("bitparam", sql.Out{Dest: &bitout}))
var strrow string
for rows.Next() {
	err = rows.Scan(&strrow)
}
fmt.Printf("bitparam is %d", bitout)

Caveat for local temporary tables

Due to protocol limitations, temporary tables will only be allocated on the connection as a result of executing a query with zero parameters. The following query will, due to the use of a parameter, execute in its own session, and #mytemp will be de-allocated right away:

conn, err := pool.Conn(ctx)
defer conn.Close()
_, err := conn.ExecContext(ctx, "select @p1 as x into #mytemp", 1)
// at this point #mytemp is already dropped again as the session of the ExecContext is over

To work around this, always explicitly create the local temporary table in a query without any parameters. As a special case, the driver will then be able to execute the query directly on the connection-scoped session. The following example works:

conn, err := pool.Conn(ctx)

// Set us up so that temp table is always cleaned up, since conn.Close()
// merely returns conn to pool, rather than actually closing the connection.
defer func() {
	_, _ = conn.ExecContext(ctx, "drop table #mytemp")  // always clean up
	conn.Close() // merely returns conn to pool
}()


// Since we not pass any parameters below, the query will execute on the scope of
// the connection and succeed in creating the table.
_, err := conn.ExecContext(ctx, "create table #mytemp ( x int )")

// #mytemp is now available even if you pass parameters
_, err := conn.ExecContext(ctx, "insert into #mytemp (x) values (@p1)", 1)

Return Status

To get the procedure return status, pass into the parameters a *mssql.ReturnStatus. For example:


var rs mssql.ReturnStatus
_, err := db.ExecContext(ctx, "theproc", &rs)
log.Printf("status=%d", rs)

or

var rs mssql.ReturnStatus
_, err := db.QueryContext(ctx, "theproc", &rs)
for rows.Next() {
	err = rows.Scan(&val)
}
log.Printf("status=%d", rs)

Limitation: ReturnStatus cannot be retrieved using QueryRow.

Parameters

The sqlserver driver uses normal MS SQL Server syntax and expects parameters in the sql query to be in the form of either @Name or @p1 to @pN (ordinal position).


db.QueryContext(ctx, `select * from t where ID = @ID and Name = @p2;`, sql.Named("ID", 6), "Bob")
Parameter Types

To pass specific types to the query parameters, say varchar or date types, you must convert the types to the type before passing in. The following types are supported:

  • string -> nvarchar
  • mssql.VarChar -> varchar
  • time.Time -> datetimeoffset or datetime (TDS version dependent)
  • mssql.DateTime1 -> datetime
  • mssql.DateTimeOffset -> datetimeoffset
  • "github.com/golang-sql/civil".Date -> date
  • "github.com/golang-sql/civil".DateTime -> datetime2
  • "github.com/golang-sql/civil".Time -> time
  • mssql.TVP -> Table Value Parameter (TDS version dependent)

Using an int parameter will send a 4 byte value (int) from a 32bit app and an 8 byte value (bigint) from a 64bit app. To make sure your integer parameter matches the size of the SQL parameter, use the appropriate sized type like int32 or int8.

// If this is passed directly as a parameter, 
// the SQL parameter generated would be nvarchar
name := "Bob"
// If the user_name is defined as varchar,
// it needs to be converted like this:
db.QueryContext(ctx, `select * from t2 where user_name = @p1;`, mssql.VarChar(name))
// Note: Mismatched data types on table and parameter may cause long running queries

Important Notes

  • LastInsertId should not be used with this driver (or SQL Server) due to how the TDS protocol works. Please use the OUTPUT Clause or add a select ID = convert(bigint, SCOPE_IDENTITY()); to the end of your query (ref SCOPE_IDENTITY). This will ensure you are getting the correct ID and will prevent a network round trip.
  • NewConnector may be used with OpenDB.
  • Connector.SessionInitSQL may be set to set any driver specific session settings after the session has been reset. If empty the session will still be reset but use the database defaults in Go1.10+.

Features

  • Can be used with SQL Server 2005 or newer
  • Can be used with Microsoft Azure SQL Database
  • Can be used on all go supported platforms (e.g. Linux, Mac OS X and Windows)
  • Supports new date/time types: date, time, datetime2, datetimeoffset
  • Supports string parameters longer than 8000 characters
  • Supports encryption using SSL/TLS
  • Supports SQL Server and Windows Authentication
  • Supports Single-Sign-On on Windows
  • Supports connections to AlwaysOn Availability Group listeners, including re-direction to read-only replicas.
  • Supports query notifications

Tests

go test is used for testing. A running instance of MSSQL server is required. Environment variables are used to pass login information.

Example:

    env SQLSERVER_DSN=sqlserver://user:pass@hostname/instance?database=test1 go test

AZURESERVER_DSN environment variable provides the connection string for Azure Active Directory-based authentication. If it's not set the AAD test will be skipped.

Deprecated

These features still exist in the driver, but they are are deprecated.

Query Parameter Token Replace (driver "mssql")

If you use the driver name "mssql" (rather then "sqlserver") the SQL text will be loosly parsed and an attempt to extract identifiers using one of

  • ?
  • ?nnn
  • :nnn
  • $nnn

will be used. This is not recommended with SQL Server. There is at least one existing won't fix issue with the query parsing.

Use the native "@Name" parameters instead with the "sqlserver" driver name.

Known Issues

  • SQL Server 2008 and 2008 R2 engine cannot handle login records when SSL encryption is not disabled. To fix SQL Server 2008 R2 issue, install SQL Server 2008 R2 Service Pack 2. To fix SQL Server 2008 issue, install Microsoft SQL Server 2008 Service Pack 3 and Cumulative update package 3 for SQL Server 2008 SP3. More information: http://support.microsoft.com/kb/2653857

Contributing

This project is a fork of https://github.com/denisenkom/go-mssqldb and welcomes new and previous contributors. For more informaton on contributing to this project, please see Contributing.

For more information on the roadmap for go-mssqldb, project plans are available for viewing and discussion.

Microsoft Open Source Code of Conduct

This project has adopted the Microsoft Open Source Code of Conduct.

Resources:

Documentation

Overview

package mssql implements the TDS protocol used to connect to MS SQL Server (sqlserver) database servers.

This package registers the driver: 

sqlserver: uses native "@" parameter placeholder names and does no pre-processing.

If the ordinal position is used for query parameters, identifiers will be named "@p1", "@p2", ... "@pN".

Please refer to the README for the format of the DSN. There are multiple DSN formats accepted: ADO style, ODBC style, and URL style. The following is an example of a URL style DSN: 

sqlserver://sa:mypass@localhost:1234?database=master&connection+timeout=30

Index

Examples

Constants

View Source 
const (
	// FedAuthLibraryLiveIDCompactToken specifies the Microsoft Live ID Compact Token authentication scheme
	FedAuthLibraryLiveIDCompactToken = 0x00

	// FedAuthLibrarySecurityToken specifies a token-based authentication where the token is available
	// without additional information provided during the login sequence.
	FedAuthLibrarySecurityToken = 0x01

	// FedAuthLibraryADAL specifies a token-based authentication where a token is obtained during the
	// login sequence using the server SPN and STS URL provided by the server during login.
	FedAuthLibraryADAL = 0x02

	// FedAuthLibraryReserved is used to indicate that no federated authentication scheme applies.
	FedAuthLibraryReserved = 0x7F
)

Federated authentication library affects the login data structure and message sequence.

View Source 
const (
	// FedAuthADALWorkflowPassword uses a username/password to obtain a token from Active Directory
	FedAuthADALWorkflowPassword = 0x01

	// fedAuthADALWorkflowPassword uses the Windows identity to obtain a token from Active Directory
	FedAuthADALWorkflowIntegrated = 0x02

	// FedAuthADALWorkflowMSI uses the managed identity service to obtain a token
	FedAuthADALWorkflowMSI = 0x03
)

Federated authentication ADAL workflow affects the mechanism used to authenticate.

Variables

View Source 
var (
	ErrorEmptyTVPTypeName = errors.New("TypeName must not be empty")
	ErrorTypeSlice        = errors.New("TVP must be slice type")
	ErrorTypeSliceIsEmpty = errors.New("TVP mustn't be null value")
	ErrorSkip             = errors.New("all fields mustn't skip")
	ErrorObjectName       = errors.New("wrong tvp name")
	ErrorWrongTyping      = errors.New("the number of elements in columnStr and tvpFieldIndexes do not align")
)

Functions

func CopyIn 

func CopyIn(table string, options BulkOptions, columns ...string) string
Example

This example shows how to perform bulk imports 

//go:build go1.10
// +build go1.10

package main

import (
	"database/sql"
	"log"
	"strings"
	"unicode/utf8"

	mssql "github.com/FromPAUS/go-mssqldb"
)

const (
	createTestTable = `CREATE TABLE test_table(
		id int IDENTITY(1,1) NOT NULL,
		test_nvarchar nvarchar(50) NULL,
		test_varchar varchar(50) NULL,
		test_float float NULL,
		test_datetime2_3 datetime2(3) NULL,
		test_bitn bit NULL,
		test_bigint bigint NOT NULL,
		test_geom geometry NULL,
	CONSTRAINT PK_table_test_id PRIMARY KEY CLUSTERED
	(
		id ASC
	) ON [PRIMARY]);`
	dropTestTable = "IF OBJECT_ID('test_table', 'U') IS NOT NULL DROP TABLE test_table;"
)

// This example shows how to perform bulk imports
func main() {

	connString := makeConnURL().String()

	db, err := sql.Open("sqlserver", connString)
	if err != nil {
		log.Fatal("Open connection failed:", err.Error())
	}
	defer db.Close()

	txn, err := db.Begin()
	if err != nil {
		log.Fatal(err)
	}

	// Create table
	_, err = db.Exec(createTestTable)
	if err != nil {
		log.Fatal(err)
	}
	defer db.Exec(dropTestTable)

	// mssqldb.CopyIn creates string to be consumed by Prepare
	stmt, err := txn.Prepare(mssql.CopyIn("test_table", mssql.BulkOptions{}, "test_varchar", "test_nvarchar", "test_float", "test_bigint"))
	if err != nil {
		log.Fatal(err.Error())
	}

	for i := 0; i < 10; i++ {
		_, err = stmt.Exec(generateString(0, 30), generateStringUnicode(0, 30), i, i)
		if err != nil {
			log.Fatal(err.Error())
		}
	}

	result, err := stmt.Exec()
	if err != nil {
		log.Fatal(err)
	}

	err = stmt.Close()
	if err != nil {
		log.Fatal(err)
	}

	err = txn.Commit()
	if err != nil {
		log.Fatal(err)
	}
	rowCount, _ := result.RowsAffected()
	log.Printf("%d row copied\n", rowCount)
	log.Printf("bye\n")
}

func generateString(x int, n int) string {
	letters := "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
	b := make([]byte, n)
	for i := range b {
		b[i] = letters[(x+i)%len(letters)]
	}
	return string(b)
}
func generateStringUnicode(x int, n int) string {
	letters := []byte("ab©💾é?ghïjklmnopqЯ☀tuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")
	b := &strings.Builder{}
	for i := 0; i < n; i++ {
		r, sz := utf8.DecodeRune(letters[x%len(letters):])
		x += sz
		b.WriteRune(r)
	}
	return b.String()
}

Output:

func IsSkipField 

func IsSkipField(tvpTagValue string, isTvpValue bool, jsonTagValue string, isJsonTagValue bool) bool

func NewAccessTokenConnector 

func NewAccessTokenConnector(dsn string, tokenProvider func() (string, error)) (driver.Connector, error)

NewAccessTokenConnector creates a new connector from a DSN and a token provider. The token provider func will be called when a new connection is requested and should return a valid access token. The returned connector may be used with sql.OpenDB.

func SetContextLogger 

func SetContextLogger(ctxLogger ContextLogger)

SetContextLogger sets a ContextLogger for both driver instances ("mssql" and "sqlserver"). Use this to get callbacks from go-mssqldb with additional information and extra details that you can log in the format of your choice. You can set either a ContextLogger or a Logger, but not both. Calling SetContextLogger will overwrite any Logger you set with SetLogger.

func SetLogger 

func SetLogger(logger Logger)

SetLogger sets a Logger for both driver instances ("mssql" and "sqlserver"). Use this to have go-msqldb log additional information in a format it picks. You can set either a Logger or a ContextLogger, but not both. Calling SetLogger will overwrite any ContextLogger you set with SetContextLogger.

Types

type Bulk 

type Bulk struct {
	Options BulkOptions
	Debug   bool
	// contains filtered or unexported fields
}

func (*Bulk) AddRow 

func (b *Bulk) AddRow(row []interface{}) (err error)

AddRow immediately writes the row to the destination table. The arguments are the row values in the order they were specified.

func (*Bulk) Done 

func (b *Bulk) Done() (rowcount int64, err error)

type BulkOptions 

type BulkOptions struct {
	CheckConstraints  bool
	FireTriggers      bool
	KeepNulls         bool
	KilobytesPerBatch int
	RowsPerBatch      int
	Order             []string
	Tablock           bool
}

type Conn 

type Conn struct {
	// contains filtered or unexported fields
}

func (*Conn) Begin 

func (c *Conn) Begin() (driver.Tx, error)

func (*Conn) BeginTx 

func (c *Conn) BeginTx(ctx context.Context, opts driver.TxOptions) (driver.Tx, error)

BeginTx satisfies ConnBeginTx.

func (*Conn) CheckNamedValue 

func (c *Conn) CheckNamedValue(nv *driver.NamedValue) error

func (*Conn) Close 

func (c *Conn) Close() error

func (*Conn) Commit 

func (c *Conn) Commit() error

func (*Conn) CreateBulk 

func (cn *Conn) CreateBulk(table string, columns []string) (_ *Bulk)

func (*Conn) CreateBulkContext 

func (cn *Conn) CreateBulkContext(ctx context.Context, table string, columns []string) (_ *Bulk)

func (*Conn) IsValid 

func (c *Conn) IsValid() bool

IsValid satisfies the driver.Validator interface.

func (*Conn) Ping 

func (c *Conn) Ping(ctx context.Context) error

Ping is used to check if the remote server is available and satisfies the Pinger interface.

func (*Conn) Prepare 

func (c *Conn) Prepare(query string) (driver.Stmt, error)

func (*Conn) PrepareContext 

func (c *Conn) PrepareContext(ctx context.Context, query string) (driver.Stmt, error)

func (*Conn) ResetSession 

func (c *Conn) ResetSession(ctx context.Context) error

func (*Conn) Rollback 

func (c *Conn) Rollback() error

type Connector 

type Connector struct {

	// SessionInitSQL is executed after marking a given session to be reset.
	// When not present, the next query will still reset the session to the
	// database defaults.
	//
	// When present the connection will immediately mark the session to
	// be reset, then execute the SessionInitSQL text to setup the session
	// that may be different from the base database defaults.
	//
	// For Example, the application relies on the following defaults
	// but is not allowed to set them at the database system level.
	//
	//    SET XACT_ABORT ON;
	//    SET TEXTSIZE -1;
	//    SET ANSI_NULLS ON;
	//    SET LOCK_TIMEOUT 10000;
	//
	// SessionInitSQL should not attempt to manually call sp_reset_connection.
	// This will happen at the TDS layer.
	//
	// SessionInitSQL is optional. The session will be reset even if
	// SessionInitSQL is empty.
	SessionInitSQL string

	// Dialer sets a custom dialer for all network operations.
	// If Dialer is not set, normal net dialers are used.
	Dialer Dialer
	// contains filtered or unexported fields
}

Connector holds the parsed DSN and is ready to make a new connection at any time.

In the future, settings that cannot be passed through a string DSN may be set directly on the connector.

Example

This example shows the usage of Connector type 

//go:build go1.10
// +build go1.10

package main

import (
	"context"
	"database/sql"
	"flag"
	"fmt"
	"log"
	"net/url"
	"strconv"

	mssql "github.com/FromPAUS/go-mssqldb"
)

var (
	debug         = flag.Bool("debug", false, "enable debugging")
	password      = flag.String("password", "", "the database password")
	port     *int = flag.Int("port", 1433, "the database port")
	server        = flag.String("server", ".", "the database server")
	user          = flag.String("user", "", "the database user")
)

const (
	createTableSql      = "CREATE TABLE TestAnsiNull (bitcol bit, charcol char(1));"
	dropTableSql        = "IF OBJECT_ID('TestAnsiNull', 'U') IS NOT NULL DROP TABLE TestAnsiNull;"
	insertQuery1        = "INSERT INTO TestAnsiNull VALUES (0, NULL);"
	insertQuery2        = "INSERT INTO TestAnsiNull VALUES (1, 'a');"
	selectNullFilter    = "SELECT bitcol FROM TestAnsiNull WHERE charcol = NULL;"
	selectNotNullFilter = "SELECT bitcol FROM TestAnsiNull WHERE charcol <> NULL;"
)

func makeConnURL() *url.URL {
	flag.Parse()
	if *debug {
		fmt.Printf(" password:%s\n", *password)
		fmt.Printf(" port:%d\n", *port)
		fmt.Printf(" server:%s\n", *server)
		fmt.Printf(" user:%s\n", *user)
	}

	params, err := mssql.GetConnParams()
	if err == nil && params != nil {
		return params.URL()
	}
	var userInfo *url.Userinfo
	if *user != "" {
		userInfo = url.UserPassword(*user, *password)
	}
	return &url.URL{
		Scheme: "sqlserver",
		Host:   *server + ":" + strconv.Itoa(*port),
		User:   userInfo,
	}
}

// This example shows the usage of Connector type
func main() {

	connString := makeConnURL().String()
	if *debug {
		fmt.Printf(" connString:%s\n", connString)
	}

	// Create a new connector object by calling NewConnector
	connector, err := mssql.NewConnector(connString)
	if err != nil {
		log.Println(err)
		return
	}

	// Use SessionInitSql to set any options that cannot be set with the dsn string
	// With ANSI_NULLS set to ON, compare NULL data with = NULL or <> NULL will return 0 rows
	connector.SessionInitSQL = "SET ANSI_NULLS ON"

	// Pass connector to sql.OpenDB to get a sql.DB object
	db := sql.OpenDB(connector)
	defer db.Close()

	// Create and populate table
	_, err = db.Exec(createTableSql)
	if err != nil {
		log.Println(err)
		return
	}
	defer db.Exec(dropTableSql)
	_, err = db.Exec(insertQuery1)
	if err != nil {
		log.Println(err)
		return
	}
	_, err = db.Exec(insertQuery2)
	if err != nil {
		log.Println(err)
		return
	}

	var bitval bool
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	// (*Row) Scan should return ErrNoRows since ANSI_NULLS is set to ON
	err = db.QueryRowContext(ctx, selectNullFilter).Scan(&bitval)
	if err != nil {
		if err.Error() != "sql: no rows in result set" {
			log.Println(err)
			return
		}
	} else {
		log.Println("Expects an ErrNoRows error. No error is returned")
		return
	}

	// (*Row) Scan should return ErrNoRows since ANSI_NULLS is set to ON
	err = db.QueryRowContext(ctx, selectNotNullFilter).Scan(&bitval)
	if err != nil {
		if err.Error() != "sql: no rows in result set" {
			log.Println(err)
			return
		}
	} else {
		log.Println("Expects an ErrNoRows error. No error is returned")
		return
	}

	// Set ANSI_NULLS to OFF
	connector.SessionInitSQL = "SET ANSI_NULLS OFF"

	// (*Row) Scan should copy data to bitval
	err = db.QueryRowContext(ctx, selectNullFilter).Scan(&bitval)
	if err != nil {
		log.Println(err)
		return
	}
	if bitval != false {
		log.Println("Incorrect value retrieved.")
		return
	}

	// (*Row) Scan should copy data to bitval
	err = db.QueryRowContext(ctx, selectNotNullFilter).Scan(&bitval)
	if err != nil {
		log.Println(err)
		return
	}
	if bitval != true {
		log.Println("Incorrect value retrieved.")
		return
	}
}

Output:

func NewActiveDirectoryTokenConnector 

func NewActiveDirectoryTokenConnector(config msdsn.Config, adalWorkflow byte, tokenProvider func(ctx context.Context, serverSPN, stsURL string) (string, error)) (*Connector, error)

newADALTokenConnector creates a new connector from a Config and a Active Directory token provider. Token provider implementations are called during federated authentication login sequences where the server provides a service principal name and security token service endpoint that should be used to obtain the token. Implementations should contact the security token service specified and obtain the appropriate token, or return an error to indicate why a token is not available.

The returned connector may be used with sql.OpenDB.

func NewConnector 

func NewConnector(dsn string) (*Connector, error)

NewConnector creates a new connector from a DSN. The returned connector may be used with sql.OpenDB.

func NewConnectorConfig 

func NewConnectorConfig(config msdsn.Config) *Connector

NewConnectorConfig creates a new Connector for a DSN Config struct. The returned connector may be used with sql.OpenDB.

func NewConnectorWithAccessTokenProvider 

func NewConnectorWithAccessTokenProvider(dsn string, tokenProvider func(ctx context.Context) (string, error)) (*Connector, error)

NewConnectorWithAccessTokenProvider creates a new connector from a DSN using the given access token provider. The returned connector may be used with sql.OpenDB.

func NewSecurityTokenConnector 

func NewSecurityTokenConnector(config msdsn.Config, tokenProvider func(ctx context.Context) (string, error)) (*Connector, error)

newSecurityTokenConnector creates a new connector from a Config and a token provider. When invoked, token provider implementations should contact the security token service specified and obtain the appropriate token, or return an error to indicate why a token is not available. The returned connector may be used with sql.OpenDB.

func (*Connector) Connect 

func (c *Connector) Connect(ctx context.Context) (driver.Conn, error)

Connect to the server and return a TDS connection.

func (*Connector) Driver 

func (c *Connector) Driver() driver.Driver

Driver underlying the Connector.

type ContextLogger 

type ContextLogger interface {
	Log(ctx context.Context, category msdsn.Log, msg string)
}

ContextLogger is an interface that provides more information than Logger and lets you log messages yourself. This gives you more information to log (e.g. trace IDs in the context), more control over the logging activity (e.g. log it, trace it, or log and trace it, depending on the class of message), and lets you log in exactly the format you want.

type DataValue 

type DataValue interface{}

type DateTime1 

type DateTime1 time.Time

DateTime1 encodes parameters to original DateTime SQL types.

type DateTimeOffset 

type DateTimeOffset time.Time

DateTimeOffset encodes parameters to DateTimeOffset, preserving the UTC offset.

Example

This example shows how to insert and retrieve date and time types data 

//go:build go1.10
// +build go1.10

package main

import (
	"database/sql"
	"fmt"
	"log"
	"time"

	mssql "github.com/FromPAUS/go-mssqldb"
	"github.com/golang-sql/civil"
)

// This example shows how to insert and retrieve date and time types data
func main() {

	connString := makeConnURL().String()

	db, err := sql.Open("sqlserver", connString)
	if err != nil {
		log.Fatal("Open connection failed:", err.Error())
	}
	defer db.Close()

	insertDateTime(db)
	retrieveDateTime(db)
	retrieveDateTimeOutParam(db)
}

func insertDateTime(db *sql.DB) {
	_, err := db.Exec("CREATE TABLE datetimeTable (timeCol TIME, dateCol DATE, smalldatetimeCol SMALLDATETIME, datetimeCol DATETIME, datetime2Col DATETIME2, datetimeoffsetCol DATETIMEOFFSET)")
	if err != nil {
		log.Fatal(err)
	}
	stmt, err := db.Prepare("INSERT INTO datetimeTable VALUES(@p1, @p2, @p3, @p4, @p5, @p6)")
	if err != nil {
		log.Fatal(err)
	}
	defer stmt.Close()

	tin, err := time.Parse(time.RFC3339, "2006-01-02T22:04:05.787-07:00")
	if err != nil {
		log.Fatal(err)
	}
	var timeCol civil.Time = civil.TimeOf(tin)
	var dateCol civil.Date = civil.DateOf(tin)
	var smalldatetimeCol string = "2006-01-02 22:04:00"
	var datetimeCol mssql.DateTime1 = mssql.DateTime1(tin)
	var datetime2Col civil.DateTime = civil.DateTimeOf(tin)
	var datetimeoffsetCol mssql.DateTimeOffset = mssql.DateTimeOffset(tin)
	_, err = stmt.Exec(timeCol, dateCol, smalldatetimeCol, datetimeCol, datetime2Col, datetimeoffsetCol)
	if err != nil {
		log.Fatal(err)
	}
}

func retrieveDateTime(db *sql.DB) {
	rows, err := db.Query("SELECT timeCol, dateCol, smalldatetimeCol, datetimeCol, datetime2Col, datetimeoffsetCol FROM datetimeTable")
	if err != nil {
		log.Fatal(err)
	}
	defer rows.Close()
	var c1, c2, c3, c4, c5, c6 time.Time
	for rows.Next() {
		err = rows.Scan(&c1, &c2, &c3, &c4, &c5, &c6)
		if err != nil {
			log.Fatal(err)
		}
		fmt.Printf("c1: %+v; c2: %+v; c3: %+v; c4: %+v; c5: %+v; c6: %+v;\n", c1, c2, c3, c4, c5, c6)
	}
}

func retrieveDateTimeOutParam(db *sql.DB) {
	CreateProcSql := `
	CREATE PROCEDURE OutDatetimeProc
		@timeOutParam TIME OUTPUT,
		@dateOutParam DATE OUTPUT,
		@smalldatetimeOutParam SMALLDATETIME OUTPUT,
		@datetimeOutParam DATETIME OUTPUT,
		@datetime2OutParam DATETIME2 OUTPUT,
		@datetimeoffsetOutParam DATETIMEOFFSET OUTPUT
	AS
		SET NOCOUNT ON
		SET @timeOutParam = '22:04:05.7870015'
		SET @dateOutParam = '2006-01-02'
		SET @smalldatetimeOutParam = '2006-01-02 22:04:00'
		SET @datetimeOutParam = '2006-01-02 22:04:05.787'
		SET @datetime2OutParam = '2006-01-02 22:04:05.7870015'
		SET @datetimeoffsetOutParam = '2006-01-02 22:04:05.7870015 -07:00'`
	_, err := db.Exec(CreateProcSql)
	if err != nil {
		log.Fatal(err)
	}
	var (
		timeOutParam, datetime2OutParam, datetimeoffsetOutParam mssql.DateTimeOffset
		dateOutParam, datetimeOutParam                          mssql.DateTime1
		smalldatetimeOutParam                                   string
	)
	_, err = db.Exec("OutDatetimeProc",
		sql.Named("timeOutParam", sql.Out{Dest: &timeOutParam}),
		sql.Named("dateOutParam", sql.Out{Dest: &dateOutParam}),
		sql.Named("smalldatetimeOutParam", sql.Out{Dest: &smalldatetimeOutParam}),
		sql.Named("datetimeOutParam", sql.Out{Dest: &datetimeOutParam}),
		sql.Named("datetime2OutParam", sql.Out{Dest: &datetime2OutParam}),
		sql.Named("datetimeoffsetOutParam", sql.Out{Dest: &datetimeoffsetOutParam}))
	if err != nil {
		log.Fatal(err)
	}
	fmt.Printf("timeOutParam: %+v; dateOutParam: %+v; smalldatetimeOutParam: %s; datetimeOutParam: %+v; datetime2OutParam: %+v; datetimeoffsetOutParam: %+v;\n", time.Time(timeOutParam), time.Time(dateOutParam), smalldatetimeOutParam, time.Time(datetimeOutParam), time.Time(datetime2OutParam), time.Time(datetimeoffsetOutParam))
}

Output:

type Dialer 

type Dialer interface {
	DialContext(ctx context.Context, network string, addr string) (net.Conn, error)
}

type Driver 

type Driver struct {
	// contains filtered or unexported fields
}

func (*Driver) Open 

func (d *Driver) Open(dsn string) (driver.Conn, error)

func (*Driver) OpenConnection 

func (d *Driver) OpenConnection(dsn string) (*Conn, error)

func (*Driver) OpenConnector 

func (d *Driver) OpenConnector(dsn string) (*Connector, error)

OpenConnector opens a new connector. Useful to dial with a context.

func (*Driver) SetContextLogger 

func (d *Driver) SetContextLogger(ctxLogger ContextLogger)

SetContextLogger sets a ContextLogger for the driver instance on which you call it. Use this to get callbacks from go-mssqldb with additional information and extra details that you can log in the format of your choice. You can set either a ContextLogger or a Logger, but not both. Calling SetContextLogger will overwrite any Logger you set with SetLogger.

func (*Driver) SetLogger 

func (d *Driver) SetLogger(logger Logger)

SetLogger sets a Logger for the driver instance on which you call it. Use this to have go-msqldb log additional information in a format it picks. You can set either a Logger or a ContextLogger, but not both. Calling SetLogger will overwrite any ContextLogger you set with SetContextLogger.

type Error 

type Error struct {
	Number     int32
	State      uint8
	Class      uint8
	Message    string
	ServerName string
	ProcName   string
	LineNo     int32
	// All lists all errors that were received from first to last.
	// This includes the last one, which is described in the other members.
	All []Error
}

Error represents an SQL Server error. This type includes methods for reading the contents of the struct, which allows calling programs to check for specific error conditions without having to import this package directly.

func (Error) Error 

func (e Error) Error() string

func (Error) SQLErrorClass 

func (e Error) SQLErrorClass() uint8

func (Error) SQLErrorLineNo 

func (e Error) SQLErrorLineNo() int32

func (Error) SQLErrorMessage 

func (e Error) SQLErrorMessage() string
Example 
package main

import (
	"fmt"
)

func main() {
	// call a function that might return a mssql error
	err := callUsingMSSQL()

	type SQLError interface {
		SQLErrorNumber() int32
		SQLErrorMessage() string
	}

	if sqlError, ok := err.(SQLError); ok {
		if sqlError.SQLErrorNumber() == 1205 {
			fmt.Println("deadlock error", sqlError.SQLErrorMessage())
		}
	}
}

func callUsingMSSQL() error {
	return nil
}

Output:

func (Error) SQLErrorNumber 

func (e Error) SQLErrorNumber() int32

SQLErrorNumber returns the SQL Server error number.

Example 
package main

import (
	"fmt"
)

func main() {
	// call a function that might return a mssql error
	err := callUsingMSSQL()

	type ErrorWithNumber interface {
		SQLErrorNumber() int32
	}

	if errorWithNumber, ok := err.(ErrorWithNumber); ok {
		if errorWithNumber.SQLErrorNumber() == 1205 {
			fmt.Println("deadlock error")
		}
	}
}

func callUsingMSSQL() error {
	return nil
}

Output:

func (Error) SQLErrorProcName 

func (e Error) SQLErrorProcName() string

func (Error) SQLErrorServerName 

func (e Error) SQLErrorServerName() string

func (Error) SQLErrorState 

func (e Error) SQLErrorState() uint8

func (Error) String 

func (e Error) String() string

type Logger 

type Logger interface {
	Printf(format string, v ...interface{})
	Println(v ...interface{})
}

Logger is an interface you can implement to have the go-msqldb driver automatically log detailed information on your behalf

type MssqlBulk 

type MssqlBulk = Bulk // Deprecated: users should transition to the new name when possible.

type MssqlBulkOptions 

type MssqlBulkOptions = BulkOptions // Deprecated: users should transition to the new name when possible.

type MssqlConn 

type MssqlConn = Conn // Deprecated: users should transition to the new name when possible.

type MssqlDriver 

type MssqlDriver = Driver // Deprecated: users should transition to the new name when possible.

type MssqlResult 

type MssqlResult = Result // Deprecated: users should transition to the new name when possible.

type MssqlRows 

type MssqlRows = Rows // Deprecated: users should transition to the new name when possible.

type MssqlStmt 

type MssqlStmt = Stmt // Deprecated: users should transition to the new name when possible.

type NVarCharMax 

type NVarCharMax string

type Result 

type Result struct {
	// contains filtered or unexported fields
}

func (*Result) LastInsertId 

func (r *Result) LastInsertId() (int64, error)

func (*Result) RowsAffected 

func (r *Result) RowsAffected() (int64, error)

type RetryableError 

type RetryableError struct {
	// contains filtered or unexported fields
}

RetryableError is returned when an error was caused by a bad connection at the start of a query and can be safely retried using database/sql's automatic retry logic.

In many cases database/sql's retry logic will transparently handle this error, the retried call will return successfully, and you won't even see this error. However, you may see this error if the retry logic cannot successfully handle the error. In that case you can get the underlying error by calling this error's UnWrap function.

func (RetryableError) Error 

func (r RetryableError) Error() string

func (RetryableError) Is 

func (r RetryableError) Is(err error) bool

func (RetryableError) Unwrap 

func (r RetryableError) Unwrap() error

type ReturnStatus 

type ReturnStatus int32

ReturnStatus may be used to return the return value from a proc. 

var rs mssql.ReturnStatus
_, err := db.Exec("theproc", &rs)
log.Printf("return status = %d", rs)

type Rows 

type Rows struct {
	// contains filtered or unexported fields
}

Rows represents the non-experimental data/sql model for Query and QueryContext

Example (Usingmessages)

This example shows the usage of sqlexp/Messages 

//go:build go1.10
// +build go1.10

package main

import (
	"context"
	"database/sql"
	"fmt"
	"log"

	mssql "github.com/FromPAUS/go-mssqldb"
	"github.com/golang-sql/sqlexp"
)

const (
	msgQuery = `select 'name' as Name
PRINT N'This is a message'
select 199
RAISERROR (N'Testing!' , 11, 1)
select 300
`
)

// This example shows the usage of sqlexp/Messages
func main() {

	connString := makeConnURL().String()

	// Create a new connector object by calling NewConnector
	connector, err := mssql.NewConnector(connString)
	if err != nil {
		log.Println(err)
		return
	}

	// Pass connector to sql.OpenDB to get a sql.DB object
	db := sql.OpenDB(connector)
	defer db.Close()
	retmsg := &sqlexp.ReturnMessage{}
	ctx := context.Background()
	rows, err := db.QueryContext(ctx, msgQuery, retmsg)
	if err != nil {
		log.Fatalf("QueryContext failed: %v", err)
	}
	active := true
	for active {
		msg := retmsg.Message(ctx)
		switch m := msg.(type) {
		case sqlexp.MsgNotice:
			fmt.Println(m.Message)
		case sqlexp.MsgNext:
			inresult := true
			for inresult {
				inresult = rows.Next()
				if inresult {
					cols, err := rows.Columns()
					if err != nil {
						log.Fatalf("Columns failed: %v", err)
					}
					fmt.Println(cols)
					var d interface{}
					if err = rows.Scan(&d); err == nil {
						fmt.Println(d)
					}
				}
			}
		case sqlexp.MsgNextResultSet:
			active = rows.NextResultSet()
		case sqlexp.MsgError:
			fmt.Println("Error:", m.Error)
		case sqlexp.MsgRowsAffected:
			fmt.Println("Rows affected:", m.Count)
		}
	}
}

Output:

func (*Rows) Close 

func (rc *Rows) Close() error

func (*Rows) ColumnTypeDatabaseTypeName 

func (r *Rows) ColumnTypeDatabaseTypeName(index int) string

RowsColumnTypeDatabaseTypeName may be implemented by Rows. It should return the database system type name without the length. Type names should be uppercase. Examples of returned types: "VARCHAR", "NVARCHAR", "VARCHAR2", "CHAR", "TEXT", "DECIMAL", "SMALLINT", "INT", "BIGINT", "BOOL", "[]BIGINT", "JSONB", "XML", "TIMESTAMP".

func (*Rows) ColumnTypeLength 

func (r *Rows) ColumnTypeLength(index int) (int64, bool)

RowsColumnTypeLength may be implemented by Rows. It should return the length of the column type if the column is a variable length type. If the column is not a variable length type ok should return false. If length is not limited other than system limits, it should return math.MaxInt64. The following are examples of returned values for various types: 

TEXT          (math.MaxInt64, true)
varchar(10)   (10, true)
nvarchar(10)  (10, true)
decimal       (0, false)
int           (0, false)
bytea(30)     (30, true)

func (*Rows) ColumnTypeNullable 

func (r *Rows) ColumnTypeNullable(index int) (nullable, ok bool)

The nullable value should be true if it is known the column may be null, or false if the column is known to be not nullable. If the column nullability is unknown, ok should be false.

func (*Rows) ColumnTypePrecisionScale 

func (r *Rows) ColumnTypePrecisionScale(index int) (int64, int64, bool)

It should return the precision and scale for decimal types. If not applicable, ok should be false. The following are examples of returned values for various types: 

decimal(38, 4)    (38, 4, true)
int               (0, 0, false)
decimal           (math.MaxInt64, math.MaxInt64, true)

func (*Rows) ColumnTypeScanType 

func (r *Rows) ColumnTypeScanType(index int) reflect.Type

It should return the value type that can be used to scan types into. For example, the database column type "bigint" this should return "reflect.TypeOf(int64(0))".

func (*Rows) Columns 

func (rc *Rows) Columns() (res []string)

func (*Rows) HasNextResultSet 

func (rc *Rows) HasNextResultSet() bool

func (*Rows) Next 

func (rc *Rows) Next(dest []driver.Value) error

func (*Rows) NextResultSet 

func (rc *Rows) NextResultSet() error

type Rowsq 

type Rowsq struct {
	// contains filtered or unexported fields
}

Rowsq implements the sqlexp messages model for Query and QueryContext Theory: We could also implement the non-experimental model this way

func (*Rowsq) Close 

func (rc *Rowsq) Close() error

func (*Rowsq) ColumnTypeDatabaseTypeName 

func (r *Rowsq) ColumnTypeDatabaseTypeName(index int) string

RowsColumnTypeDatabaseTypeName may be implemented by Rows. It should return the database system type name without the length. Type names should be uppercase. Examples of returned types: "VARCHAR", "NVARCHAR", "VARCHAR2", "CHAR", "TEXT", "DECIMAL", "SMALLINT", "INT", "BIGINT", "BOOL", "[]BIGINT", "JSONB", "XML", "TIMESTAMP".

func (*Rowsq) ColumnTypeLength 

func (r *Rowsq) ColumnTypeLength(index int) (int64, bool)

RowsColumnTypeLength may be implemented by Rows. It should return the length of the column type if the column is a variable length type. If the column is not a variable length type ok should return false. If length is not limited other than system limits, it should return math.MaxInt64. The following are examples of returned values for various types: 

TEXT          (math.MaxInt64, true)
varchar(10)   (10, true)
nvarchar(10)  (10, true)
decimal       (0, false)
int           (0, false)
bytea(30)     (30, true)

func (*Rowsq) ColumnTypeNullable 

func (r *Rowsq) ColumnTypeNullable(index int) (nullable, ok bool)

The nullable value should be true if it is known the column may be null, or false if the column is known to be not nullable. If the column nullability is unknown, ok should be false.

func (*Rowsq) ColumnTypePrecisionScale 

func (r *Rowsq) ColumnTypePrecisionScale(index int) (int64, int64, bool)

It should return the precision and scale for decimal types. If not applicable, ok should be false. The following are examples of returned values for various types: 

decimal(38, 4)    (38, 4, true)
int               (0, 0, false)
decimal           (math.MaxInt64, math.MaxInt64, true)

func (*Rowsq) ColumnTypeScanType 

func (r *Rowsq) ColumnTypeScanType(index int) reflect.Type

It should return the value type that can be used to scan types into. For example, the database column type "bigint" this should return "reflect.TypeOf(int64(0))".

func (*Rowsq) Columns 

func (rc *Rowsq) Columns() (res []string)

ProcessSingleResponse queues MsgNext for every columns token. data/sql calls Columns during the app's call to Next.

func (*Rowsq) HasNextResultSet 

func (rc *Rowsq) HasNextResultSet() bool

In Message Queue mode, we always claim another resultset could be on the way to avoid Rows being closed prematurely

func (*Rowsq) Next 

func (rc *Rowsq) Next(dest []driver.Value) error

func (*Rowsq) NextResultSet 

func (rc *Rowsq) NextResultSet() error

Scans to the end of the current statement being processed Note that the caller may not have read all the rows in the prior set

type ServerError 

type ServerError struct {
	// contains filtered or unexported fields
}

ServerError is returned when the server got a fatal error that aborts the process and severs the connection.

To get the errors returned before the process was aborted, unwrap this error or call errors.As with a pointer to an mssql.Error variable.

func (ServerError) Error 

func (e ServerError) Error() string

func (ServerError) Unwrap 

func (e ServerError) Unwrap() error

type Stmt 

type Stmt struct {
	// contains filtered or unexported fields
}

func (*Stmt) Close 

func (s *Stmt) Close() error

func (*Stmt) Exec 

func (s *Stmt) Exec(args []driver.Value) (driver.Result, error)

func (*Stmt) ExecContext 

func (s *Stmt) ExecContext(ctx context.Context, args []driver.NamedValue) (driver.Result, error)

func (*Stmt) NumInput 

func (s *Stmt) NumInput() int

func (*Stmt) Query 

func (s *Stmt) Query(args []driver.Value) (driver.Rows, error)

func (*Stmt) QueryContext 

func (s *Stmt) QueryContext(ctx context.Context, args []driver.NamedValue) (driver.Rows, error)

func (*Stmt) SetQueryNotification 

func (s *Stmt) SetQueryNotification(id, options string, timeout time.Duration)

type StreamError 

type StreamError struct {
	InnerError error
}

func (StreamError) Error 

func (e StreamError) Error() string

type TVP 

type TVP struct {
	//TypeName mustn't be default value
	TypeName string
	//Value must be the slice, mustn't be nil
	Value interface{}
}

TVP is driver type, which allows supporting Table Valued Parameters (TVP) in SQL Server

Example

This example shows how to use tvp type 

const (
	createTable = "CREATE TABLE Location (Name VARCHAR(50), CostRate INT, Availability BIT, ModifiedDate DATETIME2)"

	createTVP = `CREATE TYPE LocationTableType AS TABLE
		(LocationName VARCHAR(50),
		CostRate INT)`

	dropTVP = "IF type_id('LocationTableType') IS NOT NULL DROP TYPE LocationTableType"

	createProc = `CREATE PROCEDURE dbo.usp_InsertProductionLocation
		@TVP LocationTableType READONLY
		AS
		SET NOCOUNT ON
		INSERT INTO Location
		(
			Name,
			CostRate,
			Availability,
			ModifiedDate)
			SELECT *, 0,GETDATE()
			FROM @TVP`

	dropProc = "IF OBJECT_ID('dbo.usp_InsertProductionLocation', 'P') IS NOT NULL DROP PROCEDURE dbo.usp_InsertProductionLocation"

	execTvp = "exec dbo.usp_InsertProductionLocation @TVP;"
)
type LocationTableTvp struct {
	LocationName    string
	LocationCountry string `tvp:"-"`
	CostRate        int64
	Currency        string `json:"-"`
}

connString := makeConnURL().String()

db, err := sql.Open("sqlserver", connString)
if err != nil {
	log.Fatal("Open connection failed:", err.Error())
}
defer db.Close()

_, err = db.Exec(createTable)
if err != nil {
	log.Fatal(err)
}
_, err = db.Exec(createTVP)
if err != nil {
	log.Fatal(err)
}
defer db.Exec(dropTVP)
_, err = db.Exec(createProc)
if err != nil {
	log.Fatal(err)
}
defer db.Exec(dropProc)

locationTableTypeData := []LocationTableTvp{
	{
		LocationName:    "Alberta",
		LocationCountry: "Canada",
		CostRate:        0,
		Currency:        "CAD",
	},
	{
		LocationName:    "British Columbia",
		LocationCountry: "Canada",
		CostRate:        1,
		Currency:        "CAD",
	},
}

tvpType := mssql.TVP{
	TypeName: "LocationTableType",
	Value:    locationTableTypeData,
}

_, err = db.Exec(execTvp, sql.Named("TVP", tvpType))
if err != nil {
	log.Fatal(err)
} else {
	for _, locationData := range locationTableTypeData {
		fmt.Printf("Data for location %s, %s has been inserted.\n", locationData.LocationName, locationData.LocationCountry)
	}
}

Output:

type UniqueIdentifier 

type UniqueIdentifier [16]byte

func (UniqueIdentifier) MarshalText 

func (u UniqueIdentifier) MarshalText() []byte

MarshalText converts Uniqueidentifier to bytes corresponding to the stringified hexadecimal representation of the Uniqueidentifier e.g., "AAAAAAAA-AAAA-AAAA-AAAA-AAAAAAAAAAAA" -> [65 65 65 65 65 65 65 65 45 65 65 65 65 45 65 65 65 65 45 65 65 65 65 65 65 65 65 65 65 65 65]

func (*UniqueIdentifier) Scan 

func (u *UniqueIdentifier) Scan(v interface{}) error

func (UniqueIdentifier) String 

func (u UniqueIdentifier) String() string

func (UniqueIdentifier) Value 

func (u UniqueIdentifier) Value() (driver.Value, error)

type VarChar 

type VarChar string

VarChar parameter types.

type VarCharMax 

type VarCharMax string

Source Files

View all Source files

Directories

Path Synopsis
bach splits a single script containing multiple batches separated by a keyword into multiple scripts.
 bach splits a single script containing multiple batches separated by a keyword into multiple scripts.
internal
cp
decimal
querytext
Package querytext is the old query parser and parameter substitute process.
 Package querytext is the old query parser and parameter substitute process.

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