The mssql npm package is a Microsoft SQL Server client for Node.js. It allows you to connect to SQL Server databases, execute queries, and manage transactions. It supports both Promises and async/await syntax, making it versatile for different coding styles.
Connecting to a SQL Server
This code demonstrates how to connect to a SQL Server database using the mssql package. You need to provide your database credentials and server information in the config object.
const sql = require('mssql');
const config = {
user: 'your_username',
password: 'your_password',
server: 'your_server',
database: 'your_database'
};
async function connectToDatabase() {
try {
let pool = await sql.connect(config);
console.log('Connected to the database');
} catch (err) {
console.error('Database connection failed: ', err);
}
}
connectToDatabase();Executing a Query
This code demonstrates how to execute a SQL query using the mssql package. It connects to the database and runs a SELECT query on a specified table.
const sql = require('mssql');
const config = {
user: 'your_username',
password: 'your_password',
server: 'your_server',
database: 'your_database'
};
async function executeQuery() {
try {
let pool = await sql.connect(config);
let result = await pool.request().query('SELECT * FROM your_table');
console.log(result);
} catch (err) {
console.error('Query execution failed: ', err);
}
}
executeQuery();Using Prepared Statements
This code demonstrates how to use prepared statements with the mssql package. Prepared statements are useful for executing queries with parameters, which can help prevent SQL injection attacks.
const sql = require('mssql');
const config = {
user: 'your_username',
password: 'your_password',
server: 'your_server',
database: 'your_database'
};
async function executePreparedStatement() {
try {
let pool = await sql.connect(config);
let ps = new sql.PreparedStatement(pool);
ps.input('input_parameter', sql.Int);
await ps.prepare('SELECT * FROM your_table WHERE id = @input_parameter');
let result = await ps.execute({ input_parameter: 1 });
console.log(result);
await ps.unprepare();
} catch (err) {
console.error('Prepared statement execution failed: ', err);
}
}
executePreparedStatement();Managing Transactions
This code demonstrates how to manage transactions using the mssql package. Transactions allow you to execute a series of queries as a single unit of work, which can be committed or rolled back based on success or failure.
const sql = require('mssql');
const config = {
user: 'your_username',
password: 'your_password',
server: 'your_server',
database: 'your_database'
};
async function manageTransaction() {
try {
let pool = await sql.connect(config);
let transaction = new sql.Transaction(pool);
await transaction.begin();
let request = new sql.Request(transaction);
await request.query('INSERT INTO your_table (column1) VALUES (value1)');
await transaction.commit();
console.log('Transaction committed');
} catch (err) {
console.error('Transaction failed: ', err);
if (transaction) await transaction.rollback();
}
}
manageTransaction();The mysql package is a client for MySQL databases. It provides similar functionalities to mssql, such as connecting to a database, executing queries, and managing transactions. However, it is specifically designed for MySQL databases.
The pg package is a PostgreSQL client for Node.js. Like mssql, it allows you to connect to a database, execute queries, and manage transactions. It is tailored for PostgreSQL databases and offers features specific to PostgreSQL.
The sqlite3 package is a client for SQLite databases. It provides functionalities for connecting to SQLite databases, executing queries, and managing transactions. Unlike mssql, it is designed for lightweight, file-based databases.
An easy-to-use MSSQL database connector for Node.js.
There are some TDS modules which offer functionality to communicate with MSSQL databases but none of them does offer enough comfort - implementation takes a lot of lines of code. So I decided to create this module, that make work as easy as it could without loosing any important functionality. node-mssql uses other TDS modules as drivers and offer easy to use unified interface. It also add some extra features and bug fixes.
There is also co warpper available - co-mssql.
Extra features:
At the moment it support three TDS modules:
Connection (connect, close), Transaction (begin, commit, rollback) and Request (row, recordset, done)ConnectionError, TransactionError, ReqestErrorREAD_COMMITED (was READ_UNCOMMITED)Error messagesnpm install mssql
var sql = require('mssql');
var config = {
user: '...',
password: '...',
server: 'localhost',
database: '...'
}
var connection = new sql.Connection(config, function(err) {
// ... error checks
// Query
var request = new sql.Request(connection); // or: var request = connection.request();
request.query('select 1 as number', function(err, recordset) {
// ... error checks
console.dir(recordset);
});
// Stored Procedure
var request = new sql.Request(connection);
request.input('input_parameter', sql.Int, 10);
request.output('output_parameter', sql.Int);
request.execute('procedure_name', function(err, recordsets, returnValue) {
// ... error checks
console.dir(recordsets);
});
});
var sql = require('mssql');
var config = {
user: '...',
password: '...',
server: 'localhost',
database: '...'
}
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.Int);
request.execute('procedure_name', function(err, recordsets, returnValue) {
// ... error checks
console.dir(recordsets);
});
});
var config = {
user: '...',
password: '...',
server: 'localhost',
database: '...',
pool: {
max: 10,
min: 0,
idleTimeoutMillis: 30000
}
}
tedious). Possible values: tedious or msnodesql.1433).10).0).30000).This module update Tedious driver with some 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').
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.
Driver={SQL Server Native Client 11.0};Server=#{server},#{port};Database=#{database};Uid=#{user};Pwd=#{password};Connection Timeout=#{timeout};
This driver is not part of the default package and must be installed separately by 'npm install tds'.
This module update node-tds driver with some 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').
var connection = new sql.Connection({ /* config */ });
close).Create connection to the server.
Arguments
Example
var connection = new sql.Connection({
user: '...',
password: '...',
server: 'localhost',
database: '...'
});
connection.connect(function(err) {
// ...
});
Close connection to the server.
Example
connection.close();
var request = new sql.Request(/* [connection] */);
If you ommit connection argument, global connection is used instead.
Call a stored procedure.
Arguments
returnValue is also accessible as property of recordsets.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
// ...
});
Add an input parameter to the request.
Arguments
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.VarCharNumber -> sql.IntBoolean -> sql.BitDate -> sql.DateTimeDefault data type for unknown object is sql.VarChar.
You can define you own type map.
sql.map.register(MyClass, sql.Text);
You can also overwrite default type map.
sql.map.register(Number, sql.BigInt);
Add an output parameter to the request.
Arguments
Example
request.output('output_parameter', sql.Int);
request.output('output_parameter', sql.Char, 50);
Execute the SQL command.
Arguments
Example
var request = new sql.Request();
request.query('select 1 as number', function(err, recordset) {
// ... error checks
console.log(recordset[0].number); // return 1
// ...
});
You can enable multiple recordsets in querries by 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
});
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 aquired from the connection pool and all subsequent requests (initialized with the Transaction object) are executed exclusively on this connection. After you call commit or rollback, connection is then released back to the connection pool.
var transaction = new sql.Transaction(/* [connection] */);
If you ommit 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 commited.");
});
});
});
Transaction can also be created by var transaction = connection.transaction();. Requests can also be created by var request = transaction.request();.
Begin a transaction.
Arguments
READ_COMMITTED by default. For possible values see sql.ISOLATION_LEVEL.Example
var transaction = new sql.Transaction();
transaction.begin(function(err) {
// ...
});
Commit a transaction.
Arguments
Example
var transaction = new sql.Transaction();
transaction.begin(function(err) {
// ...
transaction.commit(function(err) {
//...
})
});
Rollback a transaction.
Arguments
Example
var transaction = new sql.Transaction();
transaction.begin(function(err) {
// ...
transaction.rollback(function(err) {
//...
})
});
There are three type of errors you can handle:
Those errors are initialized in node-mssql module and it's stack can be cropped. You can always access original error with err.originalError.
Recordset metadata are accessible trough recordset.columns property.
var request = new sql.Request();
request.query('select 1 as first, \'asdf\' as second', function(err, recordset) {
console.dir(recordset.columns);
console.log(recordset.columns.first.type === sql.Int); // true
console.log(recordset.columns.second.type === sql.VarChar); // true
});
Columns structure for example above:
{ first: { name: 'first', size: 10, type: { name: 'int' } },
second: { name: 'second', size: 4, type: { name: 'varchar' } } }
sql.Bit
sql.BigInt
sql.Decimal
sql.Float
sql.Int
sql.Money
sql.Numeric
sql.SmallInt
sql.SmallMoney
sql.Real
sql.TinyInt
sql.Char
sql.NChar
sql.Text
sql.NText
sql.VarChar
sql.NVarChar
sql.Xml
sql.Date
sql.DateTime
sql.DateTimeOffset
sql.SmallDateTime
sql.UniqueIdentifier
sql.Binary
sql.VarBinary
sql.Image
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 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 ----------
sql.map.register(String, sql.NVarChar).set language 'English';.Copyright (c) 2013-2014 Patrik Simek
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.
FAQs
Microsoft SQL Server client for Node.js.
The npm package mssql receives a total of 747,722 weekly downloads. As such, mssql popularity was classified as popular.
We found that mssql demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 4 open source maintainers collaborating on the project.
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