node-mssql

An easy-to-use MSSQL database connector for Node.js.

node-mssql

Has unified interface for multiple TDS drivers.
Has built-in connection pooling.
Supports built-in JSON serialization introduced in SQL Server 2016.
Supports Stored Procedures, Transactions, Prepared Statements, Bulk Load and TVP.
Supports serialization of Geography and Geometry CLR types.
Has smart JS data type to SQL data type mapper.
Supports Promises, Streams and standard callbacks.
Is stable and has no breaking change since 2013.
Is tested in production environment.
Is well documented.

There is also co wrapper available - co-mssql. If you're looking for session store for connect/express, visit connect-mssql.

Supported TDS drivers:

Tedious (pure JavaScript - Windows/OSX/Linux)
Microsoft / Contributors Node V8 Driver for Node.js for SQL Server (native - Windows only)
Microsoft Driver for Node.js for SQL Server (native - Windows only)
node-tds (pure JavaScript - Windows/OSX/Linux)

node-mssql uses Tedious as the default driver.

Installation

npm install mssql

Quick Example

var sql = require('mssql');

sql.connect("mssql://username:password@localhost/database").then(function() {
    // Query
    
	new sql.Request().query('select * from mytable').then(function(recordset) {
		console.dir(recordset);
	}).catch(function(err) {
		// ... query error checks
	});

    // Stored Procedure
	
	new sql.Request()
	.input('input_parameter', sql.Int, value)
    .output('output_parameter', sql.VarChar(50))
	.execute('procedure_name').then(function(recordset) {
		console.dir(recordset);
	}).catch(function(err) {
		// ... execute error checks
	});
}).catch(function(err) {
	// ... connect error checks
});

If you're on Windows Azure, add ?encrypt=true to you connection string. See docs to learn more.

Documentation

Examples

### Promises

var sql = require('mssql');

var config = {
    user: '...',
    password: '...',
    server: 'localhost', // You can use 'localhost\\instance' to connect to named instance
    database: '...',

    options: {
        encrypt: true // Use this if you're on Windows Azure
    }
}

sql.connect(config).then(function() {
	// Query
	
	var request = new sql.Request();
	request.query('select * from mytable').then(function(recordset) {
		console.dir(recordset);
	}).catch(function(err) {
		// ... error checks
	});

    // Stored Procedure
	
	var request = new sql.Request();
	request.input('input_parameter', sql.Int, value);
    request.output('output_parameter', sql.VarChar(50));
	request.execute('procedure_name').then(function(recordset) {
		console.dir(recordset);
	}).catch(function(err) {
		// ... error checks
	});
}).catch(function(err) {
	// ... error checks
});

Native Promise is used by default. You can easily change this with sql.Promise = require('myownpromisepackage').

### Nested callbacks

var sql = require('mssql');

var config = {
    user: '...',
    password: '...',
    server: 'localhost', // You can use 'localhost\\instance' to connect to named instance
    database: '...',

    options: {
        encrypt: true // Use this if you're on Windows Azure
    }
}

sql.connect(config, function(err) {
    // ... error checks

    // Query

    var request = new sql.Request();
    request.query('select 1 as number', function(err, recordset) {
        // ... error checks

        console.dir(recordset);
    });

    // Stored Procedure

    var request = new sql.Request();
    request.input('input_parameter', sql.Int, value);
    request.output('output_parameter', sql.VarChar(50));
    request.execute('procedure_name', function(err, recordsets, returnValue) {
        // ... error checks

        console.dir(recordsets);
    });
});

sql.on('error', function(err) {
	// ... error handler
});

### Streaming

If you plan to work with large amount of rows, you should always use streaming. Once you enable this, you must listen for events to receive data.

var sql = require('mssql');

var config = {
    user: '...',
    password: '...',
    server: 'localhost', // You can use 'localhost\\instance' to connect to named instance
    database: '...',
    stream: true, // You can enable streaming globally

    options: {
        encrypt: true // Use this if you're on Windows Azure
    }
}

sql.connect(config, function(err) {
    // ... error checks

    var request = new sql.Request();
    request.stream = true; // You can set streaming differently for each request
    request.query('select * from verylargetable'); // or request.execute(procedure);

    request.on('recordset', function(columns) {
    	// Emitted once for each recordset in a query
    });

    request.on('row', function(row) {
    	// Emitted for each row in a recordset
    });

    request.on('error', function(err) {
    	// May be emitted multiple times
    });

    request.on('done', function(returnValue) {
    	// Always emitted as the last one
    });
});

sql.on('error', function(err) {
	// ... error handler
});

## Multiple Connections

var sql = require('mssql');

var config = {
    user: '...',
    password: '...',
    server: 'localhost', // You can use 'localhost\\instance' to connect to named instance
    database: '...',

    options: {
        encrypt: true // Use this if you're on Windows Azure
    }
}

var connection1 = new sql.Connection(config, function(err) {
    // ... error checks

    // Query

    var request = new sql.Request(connection1); // or: var request = connection1.request();
    request.query('select 1 as number', function(err, recordset) {
        // ... error checks

        console.dir(recordset);
    });

});

connection1.on('error', function(err) {
	// ... error handler
});

var connection2 = new sql.Connection(config, function(err) {
    // ... error checks

    // Stored Procedure

    var request = new sql.Request(connection2); // or: var request = connection2.request();
    request.input('input_parameter', sql.Int, 10);
    request.output('output_parameter', sql.VarChar(50));
    request.execute('procedure_name', function(err, recordsets, returnValue) {
        // ... error checks

        console.dir(recordsets);
    });
});

connection2.on('error', function(err) {
	// ... error handler
});

## Configuration

var config = {
    user: '...',
    password: '...',
    server: 'localhost',
    database: '...',
    pool: {
        max: 10,
        min: 0,
        idleTimeoutMillis: 30000
    }
}

### General (same for all drivers)

driver - Driver to use (default: tedious). Possible values: tedious, msnodesqlv8 or msnodesql or tds.
user - User name to use for authentication.
password - Password to use for authentication.
server - Server to connect to. You can use 'localhost\instance' to connect to named instance.
port - Port to connect to (default: 1433). Don't set when connecting to named instance.
domain - Once you set domain, driver will connect to SQL Server using domain login.
database - Database to connect to (default: dependent on server configuration).
connectionTimeout - Connection timeout in ms (default: 15000).
requestTimeout - Request timeout in ms (default: 15000).
stream - Stream recordsets/rows instead of returning them all at once as an argument of callback (default: false). You can also enable streaming for each request independently (request.stream = true). Always set to true if you plan to work with large amount of rows.
parseJSON - Parse JSON recordsets to JS objects (default: false). For more information please see section JSON support.
pool.max - The maximum number of connections there can be in the pool (default: 10).
pool.min - The minimum of connections there can be in the pool (default: 0).
pool.idleTimeoutMillis - The Number of milliseconds before closing an unused connection (default: 30000).

### Formats

In addition to configuration object there is an option to pass config as a connection string. Two formats of connection string are supported.

Classic Connection String

Server=localhost,1433;Database=database;User Id=username;Password=password;Encrypt=true
Driver=msnodesqlv8;Server=(local)\INSTANCE;Database=database;UID=DOMAIN\username;PWD=password;Encrypt=true

Connection String URI

mssql://username:password@localhost:1433/database?encrypt=true
mssql://username:password@localhost/INSTANCE/database?encrypt=true&domain=DOMAIN&driver=msnodesqlv8

Version

2.5

Drivers

### Tedious

Default driver, actively maintained and production ready. Platform independent, runs everywhere Node.js runs.

Extra options:

options.instanceName - The instance name to connect to. The SQL Server Browser service must be running on the database server, and UDP port 1444 on the database server must be reachable.
options.useUTC - A boolean determining whether or not use UTC time for values without time zone offset (default: true).
options.encrypt - A boolean determining whether or not the connection will be encrypted (default: false).
options.tdsVersion - The version of TDS to use (default: 7_4, available: 7_1, 7_2, 7_3_A, 7_3_B, 7_4).
options.appName - Application name used for SQL server logging.
options.abortTransactionOnError - A boolean determining whether to rollback a transaction automatically if any error is encountered during the given transaction's execution. This sets the value for XACT_ABORT during the initial SQL phase of a connection.

More information about Tedious specific options: http://pekim.github.io/tedious/api-connection.html

### Microsoft / Contributors Node V8 Driver for Node.js for SQL Server

Requires Node.js 0.12.x/4.2.0. Windows only. This driver is not part of the default package and must be installed separately by npm install msnodesqlv8.

Extra options:

connectionString - Connection string (default: see below).
options.instanceName - The instance name to connect to. The SQL Server Browser service must be running on the database server, and UDP port 1444 on the database server must be reachable.
options.trustedConnection - Use Windows Authentication (default: false).
options.useUTC - A boolean determining whether or not to use UTC time for values without time zone offset (default: true).

Default connection string when connecting to port:

Driver={SQL Server Native Client 11.0};Server={#{server},#{port}};Database={#{database}};Uid={#{user}};Pwd={#{password}};Trusted_Connection={#{trusted}};

Default connection string when connecting to named instance:

Driver={SQL Server Native Client 11.0};Server={#{server}\\#{instance}};Database={#{database}};Uid={#{user}};Pwd={#{password}};Trusted_Connection={#{trusted}};

### Microsoft Driver for Node.js for SQL Server

Requires Node.js 0.6.x/0.8.x/0.10.x. Windows only. This driver is not part of the default package and must be installed separately by npm install msnodesql. If you are looking for compiled binaries, see node-sqlserver-binary.

Extra options:

connectionString - Connection string (default: see below).
options.instanceName - The instance name to connect to. The SQL Server Browser service must be running on the database server, and UDP port 1444 on the database server must be reachable.
options.trustedConnection - Use Windows Authentication (default: false).
options.useUTC - A boolean determining whether or not to use UTC time for values without time zone offset (default: true).

Default connection string when connecting to port:

Driver={SQL Server Native Client 11.0};Server={#{server},#{port}};Database={#{database}};Uid={#{user}};Pwd={#{password}};Trusted_Connection={#{trusted}};

Default connection string when connecting to named instance:

Driver={SQL Server Native Client 11.0};Server={#{server}\\#{instance}};Database={#{database}};Uid={#{user}};Pwd={#{password}};Trusted_Connection={#{trusted}};

### node-tds

Legacy support, don't use this driver for new projects. This driver is not part of the default package and must be installed separately by npm install tds.

node-mssql updates this driver with extra features and bug fixes by overriding some of its internal functions. If you want to disable this, require module with var sql = require('mssql/nofix').

## Connections

Internally, each Connection instance is a separate pool of TDS connections. Once you create a new Request/Transaction/Prepared Statement, a new TDS connection is acquired from the pool and reserved for desired action. Once the action is complete, connection is released back to the pool. Connection health check is built-in so once the dead connection is discovered, it is immediately replaced with a new one.

IMPORTANT: Always attach an error listener to created connection. Whenever something goes wrong with the connection it will emit an error and if there is no listener (and no domain listener as a backup) it will crash the application as an uncaught error.

var connection = new sql.Connection({ /* config */ });

Errors

EDRIVER (ConnectionError) - Unknown driver.

Events

connect - Dispatched after connection has established.
close - Dispatched after connection has closed a pool (by calling close).
error(err) - Dispatched on connection error.

### connect([callback])

Create a new connection pool with one active connection. This one initial connection serves as a probe to find out whether the configuration is valid.

Arguments

callback(err) - A callback which is called after connection has established, or an error has occurred. Optional. If omitted, returns Promise.

Example

var connection = new sql.Connection({
    user: '...',
    password: '...',
    server: 'localhost',
    database: '...'
});

connection.connect(function(err) {
    // ...
});

Errors

ELOGIN (ConnectionError) - Login failed.
ETIMEOUT (ConnectionError) - Connection timeout.
EALREADYCONNECTED (ConnectionError) - Database is already connected!
EALREADYCONNECTING (ConnectionError) - Already connecting to database!
EINSTLOOKUP (ConnectionError) - Instance lookup failed.
ESOCKET (ConnectionError) - Socket error.

### close()

Close all active connections in the pool.

Example

connection.close();

## Requests

var request = new sql.Request(/* [connection] */);

If you omit connection argument, global connection is used instead.

Events

recordset(columns) - Dispatched when metadata for new recordset are parsed.
row(row) - Dispatched when new row is parsed.
done(returnValue) - Dispatched when request is complete.
error(err) - Dispatched on error.

### execute(procedure, [callback])

Call a stored procedure.

Arguments

procedure - Name of the stored procedure to be executed.
callback(err, recordsets, returnValue) - A callback which is called after execution has completed, or an error has occurred. returnValue is also accessible as property of recordsets. Optional. If omitted, returns Promise.

Example

var request = new sql.Request();
request.input('input_parameter', sql.Int, value);
request.output('output_parameter', sql.Int);
request.execute('procedure_name', function(err, recordsets, returnValue) {
    // ... error checks

    console.log(recordsets.length); // count of recordsets returned by the procedure
    console.log(recordsets[0].length); // count of rows contained in first recordset
    console.log(returnValue); // procedure return value
    console.log(recordsets.returnValue); // same as previous line

    console.log(request.parameters.output_parameter.value); // output value

    // ...
});

Errors

EREQUEST (RequestError) - Message from SQL Server
ECANCEL (RequestError) - Cancelled.
ETIMEOUT (RequestError) - Request timeout.
ENOCONN (RequestError) - No connection is specified for that request.
ENOTOPEN (ConnectionError) - Connection not yet open.
ECONNCLOSED (ConnectionError) - Connection is closed.
ENOTBEGUN (TransactionError) - Transaction has not begun.
EABORT (TransactionError) - Transaction was aborted (by user or because of an error).

### input(name, [type], value)

Add an input parameter to the request.

Arguments

name - Name of the input parameter without @ char.
type - SQL data type of input parameter. If you omit type, module automatically decide which SQL data type should be used based on JS data type.
value - Input parameter value. undefined ans NaN values are automatically converted to null values.

Example

request.input('input_parameter', value);
request.input('input_parameter', sql.Int, value);

JS Data Type To SQL Data Type Map

String -> sql.NVarChar
Number -> sql.Int
Boolean -> sql.Bit
Date -> sql.DateTime
Buffer -> sql.VarBinary
sql.Table -> sql.TVP

Default data type for unknown object is sql.NVarChar.

You can define your own type map.

sql.map.register(MyClass, sql.Text);

You can also overwrite the default type map.

sql.map.register(Number, sql.BigInt);

Errors (synchronous)

EARGS (RequestError) - Invalid number of arguments.
EINJECT (RequestError) - SQL injection warning.

### output(name, type, [value])

Add an output parameter to the request.

Arguments

name - Name of the output parameter without @ char.
type - SQL data type of output parameter.
value - Output parameter value initial value. undefined and NaN values are automatically converted to null values. Optional.

Example

request.output('output_parameter', sql.Int);
request.output('output_parameter', sql.VarChar(50), 'abc');

Errors (synchronous)

EARGS (RequestError) - Invalid number of arguments.
EINJECT (RequestError) - SQL injection warning.

### pipe(stream)

Sets request to stream mode and pulls all rows from all recordsets to a given stream.

Arguments

stream - Writable stream in object mode.

Example

var request = new sql.Request();
request.pipe(stream);
request.query('select * from mytable');
stream.on('error', function(err) {
    // ...
});
stream.on('finish', function() {
    // ...
});

Version

2.0

### query(command, [callback])

Execute the SQL command. To execute commands like create procedure or if you plan to work with local temporary tables, use batch instead.

Arguments

command - T-SQL command to be executed.
callback(err, recordset) - A callback which is called after execution has completed, or an error has occurred. Optional. If omitted, returns Promise.

Example

var request = new sql.Request();
request.query('select 1 as number', function(err, recordset) {
    // ... error checks

    console.log(recordset[0].number); // return 1

    // ...
});

Errors

ETIMEOUT (RequestError) - Request timeout.
EREQUEST (RequestError) - Message from SQL Server
ECANCEL (RequestError) - Cancelled.
ENOCONN (RequestError) - No connection is specified for that request.
ENOTOPEN (ConnectionError) - Connection not yet open.
ECONNCLOSED (ConnectionError) - Connection is closed.
ENOTBEGUN (TransactionError) - Transaction has not begun.
EABORT (TransactionError) - Transaction was aborted (by user or because of an error).

You can enable multiple recordsets in queries with the request.multiple = true command.

var request = new sql.Request();
request.multiple = true;

request.query('select 1 as number; select 2 as number', function(err, recordsets) {
    // ... error checks

    console.log(recordsets[0][0].number); // return 1
    console.log(recordsets[1][0].number); // return 2
});

NOTE: To get number of rows affected by the statement(s), see section Affected Rows.

### batch(batch, [callback])

Execute the SQL command. Unlike query, it doesn't use sp_executesql, so is not likely that SQL Server will reuse the execution plan it generates for the SQL. Use this only in special cases, for example when you need to execute commands like create procedure which can't be executed with query or if you're executing statements longer than 4000 chars on SQL Server 2000. Also you should use this if you're plan to work with local temporary tables (more information here).

NOTE: Table-Valued Parameter (TVP) is not supported in batch.

Arguments

batch - T-SQL command to be executed.
callback(err, recordset) - A callback which is called after execution has completed, or an error has occurred. Optional. If omitted, returns Promise.

Example

var request = new sql.Request();
request.batch('create procedure #temporary as select * from table', function(err, recordset) {
    // ... error checks
});

Errors

ETIMEOUT (RequestError) - Request timeout.
EREQUEST (RequestError) - Message from SQL Server
ECANCEL (RequestError) - Cancelled.
ENOCONN (RequestError) - No connection is specified for that request.
ENOTOPEN (ConnectionError) - Connection not yet open.
ECONNCLOSED (ConnectionError) - Connection is closed.
ENOTBEGUN (TransactionError) - Transaction has not begun.
EABORT (TransactionError) - Transaction was aborted (by user or because of an error).

You can enable multiple recordsets in queries with the request.multiple = true command.

### bulk(table, [callback])

Perform a bulk insert.

Arguments

table - sql.Table instance.
callback(err, rowCount) - A callback which is called after bulk insert has completed, or an error has occurred. Optional. If omitted, returns Promise.

Example

var table = new sql.Table('table_name'); // or temporary table, e.g. #temptable
table.create = true;
table.columns.add('a', sql.Int, {nullable: true});
table.columns.add('b', sql.VarChar(50), {nullable: false});
table.rows.add(777, 'test');

var request = new sql.Request();
request.bulk(table, function(err, rowCount) {
    // ... error checks
});

IMPORTANT: Always indicate whether the column is nullable or not!

TIP: If you set table.create to true, module will check if the table exists before it start sending data. If it doesn't, it will automatically create it.

TIP: You can also create Table variable from any recordset with recordset.toTable().

Errors

ENAME (RequestError) - Table name must be specified for bulk insert.
ETIMEOUT (RequestError) - Request timeout.
EREQUEST (RequestError) - Message from SQL Server
ECANCEL (RequestError) - Cancelled.
ENOCONN (RequestError) - No connection is specified for that request.
ENOTOPEN (ConnectionError) - Connection not yet open.
ECONNCLOSED (ConnectionError) - Connection is closed.
ENOTBEGUN (TransactionError) - Transaction has not begun.
EABORT (TransactionError) - Transaction was aborted (by user or because of an error).

### cancel()

Cancel currently executing request. Return true if cancellation packet was send successfully.

Example

var request = new sql.Request();
request.query('waitfor delay \'00:00:05\'; select 1 as number', function(err, recordset) {
    console.log(err instanceof sql.RequestError);  // true
    console.log(err.message);                      // Cancelled.
    console.log(err.code);                         // ECANCEL

    // ...
});

request.cancel();

## Transactions

IMPORTANT: always use Transaction class to create transactions - it ensures that all your requests are executed on one connection. Once you call begin, a single connection is acquired from the connection pool and all subsequent requests (initialized with the Transaction object) are executed exclusively on this connection. Transaction also contains a queue to make sure your requests are executed in series. After you call commit or rollback, connection is then released back to the connection pool.

var transaction = new sql.Transaction(/* [connection] */);

If you omit connection argument, global connection is used instead.

Example

var transaction = new sql.Transaction(/* [connection] */);
transaction.begin(function(err) {
    // ... error checks

    var request = new sql.Request(transaction);
    request.query('insert into mytable (mycolumn) values (12345)', function(err, recordset) {
        // ... error checks

        transaction.commit(function(err, recordset) {
            // ... error checks

            console.log("Transaction committed.");
        });
    });
});

Transaction can also be created by var transaction = connection.transaction();. Requests can also be created by var request = transaction.request();.

Aborted transactions

This example shows how you should correctly handle transaction errors when abortTransactionOnError (XACT_ABORT) is enabled. Added in 2.0.

var transaction = new sql.Transaction(/* [connection] */);
transaction.begin(function(err) {
    // ... error checks

    var rolledBack = false;

    transaction.on('rollback', function(aborted) {
	    // emited with aborted === true

	    rolledBack = true;
    });

    var request = new sql.Request(transaction);
    request.query('insert into mytable (bitcolumn) values (2)', function(err, recordset) {
        // insert should fail because of invalid value

		if (err) {
			if (!rolledBack) {
		        transaction.rollback(function(err) {
		            // ... error checks
		        });
		    }
		} else {
			transaction.commit(function(err) {
	            // ... error checks
	        });
		}
    });
});

Events

begin - Dispatched when transaction begin.
commit - Dispatched on successful commit.
rollback(aborted) - Dispatched on successful rollback with an argument determining if the transaction was aborted (by user or because of an error).

### begin([isolationLevel], [callback])

Begin a transaction.

Arguments

isolationLevel - Controls the locking and row versioning behavior of TSQL statements issued by a connection. Optional. READ_COMMITTED by default. For possible values see sql.ISOLATION_LEVEL.
callback(err) - A callback which is called after transaction has began, or an error has occurred. Optional. If omitted, returns Promise.

Example

var transaction = new sql.Transaction();
transaction.begin(function(err) {
    // ... error checks
});

Errors

ENOTOPEN (ConnectionError) - Connection not yet open.
EALREADYBEGUN (TransactionError) - Transaction has already begun.

### commit([callback])

Commit a transaction.

Arguments

callback(err) - A callback which is called after transaction has committed, or an error has occurred. Optional. If omitted, returns Promise.

Example

var transaction = new sql.Transaction();
transaction.begin(function(err) {
    // ... error checks

    transaction.commit(function(err) {
        // ... error checks
    })
});

Errors

ENOTBEGUN (TransactionError) - Transaction has not begun.
EREQINPROG (TransactionError) - Can't commit transaction. There is a request in progress.

### rollback([callback])

Rollback a transaction. If the queue isn't empty, all queued requests will be Cancelled and the transaction will be marked as aborted.

Arguments

callback(err) - A callback which is called after transaction has rolled back, or an error has occurred. Optional. If omitted, returns Promise.

Example

var transaction = new sql.Transaction();
transaction.begin(function(err) {
    // ... error checks

    transaction.rollback(function(err) {
        // ... error checks
    })
});

Errors

ENOTBEGUN (TransactionError) - Transaction has not begun.
EREQINPROG (TransactionError) - Can't rollback transaction. There is a request in progress.

## PreparedStatement

IMPORTANT: always use PreparedStatement class to create prepared statements - it ensures that all your executions of prepared statement are executed on one connection. Once you call prepare, a single connection is acquired from the connection pool and all subsequent executions are executed exclusively on this connection. Prepared Statement also contains a queue to make sure your executions are executed in series. After you call unprepare, the connection is then released back to the connection pool.

var ps = new sql.PreparedStatement(/* [connection] */);

If you omit the connection argument, the global connection is used instead.

Example

var ps = new sql.PreparedStatement(/* [connection] */);
ps.input('param', sql.Int);
ps.prepare('select @param as value', function(err) {
    // ... error checks

    ps.execute({param: 12345}, function(err, recordset) {
        // ... error checks

        ps.unprepare(function(err) {
            // ... error checks

        });
    });
});

IMPORTANT: Remember that each prepared statement means one reserved connection from the pool. Don't forget to unprepare a prepared statement!

TIP: You can also create prepared statements in transactions (new sql.PreparedStatement(transaction)), but keep in mind you can't execute other requests in the transaction until you call unprepare.

### input(name, type)

Add an input parameter to the prepared statement.

Arguments

name - Name of the input parameter without @ char.
type - SQL data type of input parameter.

Example

ps.input('input_parameter', sql.Int);
ps.input('input_parameter', sql.VarChar(50));

Errors (synchronous)

EARGS (PreparedStatementError) - Invalid number of arguments.
EINJECT (PreparedStatementError) - SQL injection warning.

### output(name, type)

Add an output parameter to the prepared statement.

Arguments

name - Name of the output parameter without @ char.
type - SQL data type of output parameter.

Example

ps.output('output_parameter', sql.Int);
ps.output('output_parameter', sql.VarChar(50));

Errors (synchronous)

EARGS (PreparedStatementError) - Invalid number of arguments.
EINJECT (PreparedStatementError) - SQL injection warning.

### prepare(statement, [callback])

Prepare a statement.

Arguments

statement - T-SQL statement to prepare.
callback(err) - A callback which is called after preparation has completed, or an error has occurred. Optional. If omitted, returns Promise.

Example

var ps = new sql.PreparedStatement();
ps.prepare('select @param as value', function(err) {
    // ... error checks
});

Errors

ENOTOPEN (ConnectionError) - Connection not yet open.
EALREADYPREPARED (PreparedStatementError) - Statement is already prepared.
ENOTBEGUN (TransactionError) - Transaction has not begun.

### execute(values, [callback])

Execute a prepared statement.

Arguments

values - An object whose names correspond to the names of parameters that were added to the prepared statement before it was prepared.
callback(err) - A callback which is called after execution has completed, or an error has occurred. Optional. If omitted, returns Promise.

Example

var ps = new sql.PreparedStatement();
ps.input('param', sql.Int);
ps.prepare('select @param as value', function(err) {
    // ... error checks

    ps.execute({param: 12345}, function(err, recordset, affected) {
        // ... error checks

        console.log(recordset[0].value); // return 12345
        console.log(affected); // Returns number of affected rows in case of INSERT, UPDATE or DELETE statement.
    });
});

You can enable multiple recordsets by ps.multiple = true command.

var ps = new sql.PreparedStatement();
ps.input('param', sql.Int);
ps.prepare('select @param as value', function(err) {
    // ... error checks

    ps.multiple = true;
    ps.execute({param: 12345}, function(err, recordsets, affected) {
        // ... error checks

        console.log(recordsets[0][0].value); // return 12345
        console.log(affected); // Returns number of affected rows in case of INSERT, UPDATE or DELETE statement.
    });
});

You can also stream executed request.

var ps = new sql.PreparedStatement();
ps.input('param', sql.Int);
ps.prepare('select @param as value', function(err) {
    // ... error checks

    ps.stream = true;
    request = ps.execute({param: 12345});

    request.on('recordset', function(columns) {
    	// Emitted once for each recordset in a query
    });

    request.on('row', function(row) {
    	// Emitted for each row in a recordset
    });

    request.on('error', function(err) {
    	// May be emitted multiple times
    });

    request.on('done', function(returnValue, affected) {
    	// Always emitted as the last one
    	
        console.log(affected); // Returns number of affected rows in case of INSERT, UPDATE or DELETE statement.
    });
});

TIP: To learn more about how number of affected rows works, see section Affected Rows.

Errors

ENOTPREPARED (PreparedStatementError) - Statement is not prepared.
ETIMEOUT (RequestError) - Request timeout.
EREQUEST (RequestError) - Message from SQL Server
ECANCEL (RequestError) - Cancelled.

### unprepare([callback])

Unprepare a prepared statement.

Arguments

callback(err) - A callback which is called after unpreparation has completed, or an error has occurred. Optional. If omitted, returns Promise.

Example

var ps = new sql.PreparedStatement();
ps.input('param', sql.Int);
ps.prepare('select @param as value', function(err, recordsets) {
    // ... error checks

    ps.unprepare(function(err) {
        // ... error checks

    });
});

Errors

ENOTPREPARED (PreparedStatementError) - Statement is not prepared.

## CLI

Before you can start using CLI, you must install mssql globally with npm install mssql -g. Once you do that you will be able to execute mssql command.

Setup

Create a .mssql.json configuration file (anywhere). Structure of the file is the same as the standard configuration object.

{
    "user": "...",
    "password": "...",
    "server": "localhost",
    "database": "..."
}

Example

echo "select * from mytable" | mssql /path/to/config

Results in:

[[{"username":"patriksimek","password":"tooeasy"}]]

You can also query for multiple recordsets.

echo "select * from mytable; select * from myothertable" | mssql

Results in:

[[{"username":"patriksimek","password":"tooeasy"}],[{"id":15,"name":"Product name"}]]

If you omit config path argument, mssql will try to load it from current working directory.

Version

2.0

## Geography and Geometry

node-mssql has built-in serializer for Geography and Geometry CLR data types.

select geography::STGeomFromText('LINESTRING(-122.360 47.656, -122.343 47.656 )', 4326)
select geometry::STGeomFromText('LINESTRING (100 100 10.3 12, 20 180, 180 180)', 0)

Results in:

{ srid: 4326,
  version: 1,
  points: [ { x: 47.656, y: -122.36 }, { x: 47.656, y: -122.343 } ],
  figures: [ { attribute: 1, pointOffset: 0 } ],
  shapes: [ { parentOffset: -1, figureOffset: 0, type: 2 } ],
  segments: [] }

{ srid: 0,
  version: 1,
  points:
   [ { x: 100, y: 100, z: 10.3, m: 12 },
     { x: 20, y: 180, z: NaN, m: NaN },
     { x: 180, y: 180, z: NaN, m: NaN } ],
  figures: [ { attribute: 1, pointOffset: 0 } ],
  shapes: [ { parentOffset: -1, figureOffset: 0, type: 2 } ],
  segments: [] }

## Table-Valued Parameter (TVP)

Supported on SQL Server 2008 and later. You can pass a data table as a parameter to stored procedure. First, we have to create custom type in our database.

CREATE TYPE TestType AS TABLE ( a VARCHAR(50), b INT );

Next we will need a stored procedure.

CREATE PROCEDURE MyCustomStoredProcedure (@tvp TestType readonly) AS SELECT * FROM @tvp

Now let's go back to our Node.js app.

var tvp = new sql.Table()

// Columns must correspond with type we have created in database.
tvp.columns.add('a', sql.VarChar(50));
tvp.columns.add('b', sql.Int);

// Add rows
tvp.rows.add('hello tvp', 777); // Values are in same order as columns.

You can send table as a parameter to stored procedure.

var request = new sql.Request();
request.input('tvp', tvp);
request.execute('MyCustomStoredProcedure', function(err, recordsets, returnValue) {
    // ... error checks

    console.dir(recordsets[0][0]); // {a: 'hello tvp', b: 777}
});

TIP: You can also create Table variable from any recordset with recordset.toTable().

## Affected Rows

If you're performing INSERT, UPDATE or DELETE in a query, you can read number of affected rows.

Example using Promises

var request = new sql.Request();
request.query('update myAwesomeTable set awesomness = 100').then(function(recordset) {
    console.log(request.rowsAffected);
});

Example using callbacks

var request = new sql.Request();
request.query('update myAwesomeTable set awesomness = 100', function(err, recordset, affected) {
    console.log(affected);
});

Example using streaming

var request = new sql.Request();
request.stream = true;
request.query('update myAwesomeTable set awesomness = 100');
request.on('done', function(affected) {
    console.log(affected);
});

NOTE: If your query contains multiple INSERT, UPDATE or DELETE statements, the number of affected rows is a sum of all of them.

## JSON support (experimental, works only with Tedious driver)

SQL Server 2016 introduced built-in JSON serialization. By default, JSON is returned as a plain text in a special column named JSON_F52E2B61-18A1-11d1-B105-00805F49916B.

Example

SELECT
    1 AS 'a.b.c',
    2 AS 'a.b.d',
    3 AS 'a.x',
    4 AS 'a.y'
FOR JSON PATH

Results in:

recordset = [ { 'JSON_F52E2B61-18A1-11d1-B105-00805F49916B': '{"a":{"b":{"c":1,"d":2},"x":3,"y":4}}' } ]

You can enable built-in JSON parser with config.parseJSON = true. Once you enable this, recordset will contain rows of parsed JS objects. Given the same example, result will look like this:

recordset = [ { a: { b: { c: 1, d: 2 }, x: 3, y: 4 } } ]

IMPORTANT: In order for this to work, there must be exactly one column named JSON_F52E2B61-18A1-11d1-B105-00805F49916B in the recordset.

More information about JSON support can be found in official documentation.

Version

2.3

## Errors

There are 4 types of errors you can handle:

ConnectionError - Errors related to connections and connection pool.
TransactionError - Errors related to creating, committing and rolling back transactions.
RequestError - Errors related to queries and stored procedures execution.
PreparedStatementError - Errors related to prepared statements.

Those errors are initialized in node-mssql module and its original stack may be cropped. You can always access original error with err.originalError.

SQL Server may generate more than one error for one request so you can access preceding errors with err.precedingErrors.

Error Codes

Each known error has name, code and message properties.

Name	Code	Message
`ConnectionError`	ELOGIN	Login failed.
`ConnectionError`	ETIMEOUT	Connection timeout.
`ConnectionError`	EDRIVER	Unknown driver.
`ConnectionError`	EALREADYCONNECTED	Database is already connected!
`ConnectionError`	EALREADYCONNECTING	Already connecting to database!
`ConnectionError`	ENOTOPEN	Connection not yet open.
`ConnectionError`	EINSTLOOKUP	Instance lookup failed.
`ConnectionError`	ESOCKET	Socket error.
`ConnectionError`	ECONNCLOSED	Connection is closed.
`TransactionError`	ENOTBEGUN	Transaction has not begun.
`TransactionError`	EALREADYBEGUN	Transaction has already begun.
`TransactionError`	EREQINPROG	Can't commit/rollback transaction. There is a request in progress.
`TransactionError`	EABORT	Transaction has been aborted.
`RequestError`	EREQUEST	Message from SQL Server. Error object contains additional details.
`RequestError`	ECANCEL	Cancelled.
`RequestError`	ETIMEOUT	Request timeout.
`RequestError`	EARGS	Invalid number of arguments.
`RequestError`	EINJECT	SQL injection warning.
`RequestError`	ENOCONN	No connection is specified for that request.
`PreparedStatementError`	EARGS	Invalid number of arguments.
`PreparedStatementError`	EINJECT	SQL injection warning.
`PreparedStatementError`	EALREADYPREPARED	Statement is already prepared.
`PreparedStatementError`	ENOTPREPARED	Statement is not prepared.

Detailed SQL Errors

SQL errors (RequestError with err.code equal to EREQUEST) contains additional details.

err.number - The error number.
err.state - The error state, used as a modifier to the error number.
err.class - The class (severity) of the error. A class of less than 10 indicates an informational message. Detailed explanation can be found here.
err.lineNumber - The line number in the SQL batch or stored procedure that caused the error. Line numbers begin at 1; therefore, if the line number is not applicable to the message, the value of LineNumber will be 0.
err.serverName - The server name.
err.procName - The stored procedure name.

## Metadata

Recordset metadata are accessible through the recordset.columns property.

var request = new sql.Request();
request.query('select convert(decimal(18, 4), 1) as first, \'asdf\' as second', function(err, recordset) {
    console.dir(recordset.columns);

    console.log(recordset.columns.first.type === sql.Decimal); // true
    console.log(recordset.columns.second.type === sql.VarChar); // true
});

Columns structure for example above:

{
	first: {
		index: 0,
		name: 'first',
		length: 17,
		type: [sql.Decimal],
		scale: 4,
		precision: 18,
		nullable: true,
		caseSensitive: false
		identity: false
		readOnly: true
	},
	second: {
		index: 1,
		name: 'second',
		length: 4,
		type: [sql.VarChar],
		nullable: false,
		caseSensitive: false
		identity: false
		readOnly: true
	}
}

## Data Types

You can define data types with length/precision/scale:

request.input("name", sql.VarChar, "abc");               // varchar(3)
request.input("name", sql.VarChar(50), "abc");           // varchar(50)
request.input("name", sql.VarChar(sql.MAX), "abc");      // varchar(MAX)
request.output("name", sql.VarChar);                     // varchar(8000)
request.output("name", sql.VarChar, "abc");              // varchar(3)

request.input("name", sql.Decimal, 155.33);              // decimal(18, 0)
request.input("name", sql.Decimal(10), 155.33);          // decimal(10, 0)
request.input("name", sql.Decimal(10, 2), 155.33);       // decimal(10, 2)

request.input("name", sql.DateTime2, new Date());        // datetime2(7)
request.input("name", sql.DateTime2(5), new Date());     // datetime2(5)

List of supported data types:

sql.Bit
sql.BigInt
sql.Decimal ([precision], [scale])
sql.Float
sql.Int
sql.Money
sql.Numeric ([precision], [scale])
sql.SmallInt
sql.SmallMoney
sql.Real
sql.TinyInt

sql.Char ([length])
sql.NChar ([length])
sql.Text
sql.NText
sql.VarChar ([length])
sql.NVarChar ([length])
sql.Xml

sql.Time ([scale])
sql.Date
sql.DateTime
sql.DateTime2 ([scale])
sql.DateTimeOffset ([scale])
sql.SmallDateTime

sql.UniqueIdentifier

sql.Variant

sql.Binary
sql.VarBinary ([length])
sql.Image

sql.UDT
sql.Geography
sql.Geometry

To setup MAX length for VarChar, NVarChar and VarBinary use sql.MAX length. Types sql.XML and sql.Variant are not supported as input parameters.

## SQL injection

This module has built-in SQL injection protection. Always use parameters to pass sanitized values to your queries.

var request = new sql.Request();
request.input('myval', sql.VarChar, '-- commented');
request.query('select @myval as myval', function(err, recordset) {
    console.dir(recordset);
});

## Verbose Mode

You can enable verbose mode by request.verbose = true command.

var request = new sql.Request();
request.verbose = true;
request.input('username', 'patriksimek');
request.input('password', 'dontuseplaintextpassword');
request.input('attempts', 2);
request.execute('my_stored_procedure');

Output for the example above could look similar to this.

---------- sql execute --------
     proc: my_stored_procedure
    input: @username, varchar, patriksimek
    input: @password, varchar, dontuseplaintextpassword
    input: @attempts, bigint, 2
---------- response -----------
{ id: 1,
  username: 'patriksimek',
  password: 'dontuseplaintextpassword',
  email: null,
  language: 'en',
  attempts: 2 }
---------- --------------------
   return: 0
 duration: 5ms
---------- completed ----------

## Known issues

Tedious

If you're facing problems with connecting SQL Server 2000, try setting the default TDS version to 7.1 with config.options.tdsVersion = '7_1' (issue)
If you're executing a statement longer than 4000 chars on SQL Server 2000, always use batch instead of query (issue)

msnodesqlv8

msnodesqlv8 has problem with errors during transactions - reported.
msnodesqlv8 doesn't support TVP data type.
msnodesqlv8 doesn't support Variant data type.
msnodesqlv8 doesn't support request timeout.
msnodesqlv8 doesn't support request cancellation.
msnodesqlv8 doesn't support detailed SQL errors.

msnodesql

msnodesql has problem with errors during transactions - reported.
msnodesql contains bug in DateTimeOffset (reported)
msnodesql doesn't support Bulk load.
msnodesql doesn't support TVP data type.
msnodesql doesn't support Variant data type.
msnodesql doesn't support request timeout.
msnodesql doesn't support request cancellation.
msnodesql doesn't support detailed SQL errors.
msnodesql reports invalid number of affected rows in some cases.

node-tds

If you're facing problems with date, try changing your tsql language set language 'English';.
node-tds doesn't support connecting to named instances.
node-tds contains bug and return same value for columns with same name.
node-tds doesn't support codepage of input parameters.
node-tds contains bug in selects that doesn't return any values (select @param = 'value').
node-tds doesn't support Binary, VarBinary and Image as parameters.
node-tds always return date/time values in local time.
node-tds has serious problems with MAX types.
node-tds doesn't support Bulk load.
node-tds doesn't support TVP data type.
node-tds doesn't support Variant data type.
node-tds doesn't support request timeout.
node-tds doesn't support built-in JSON serialization introduced in SQL Server 2016.
node-tds doesn't support detailed SQL errors.
node-tds doesn't support Affected Rows

## License

The MIT License

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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bin		bin
src		src
test		test
.gitignore		.gitignore
.npmignore		.npmignore
.travis.yml		.travis.yml
CHANGELOG.txt		CHANGELOG.txt
README.md		README.md
appveyor.yml		appveyor.yml
index.js		index.js
nofix.js		nofix.js
package.json		package.json

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