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https://github.com/mlaanderson/database-js

Common Database Interface for Node
https://github.com/mlaanderson/database-js

database excel firebase ini javascript javascript-library json msaccess mysql node node-module postgresql sql sqlite wrapper

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Common Database Interface for Node

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# database-js



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> Wrapper for multiple databases with a JDBC-like connection



Database-js implements a common, promise-based interface for SQL database access. Inspired by JDBC, it uses connection strings to identify the database driver. Wrappers around native database drivers provide a unified interface to handle databases. Thus, you can change the target database by modifying the connection string. 😉



Database-js has built-in prepared statements, even if the underlying driver does not support them. It is built on Promises, so it works well with ES7 async code.



## Contents



* [Install](#install)

* [Usage](#usage)

* [Examples](//github.com/mlaanderson/database-js/wiki/Examples)

* [API](//github.com/mlaanderson/database-js/wiki/API)

* [Drivers](//github.com/mlaanderson/database-js/wiki/Drivers)

* [In the Browser](//github.com/mlaanderson/database-js/wiki/Browsers)



## Install



```shell

npm install database-js

```



## Drivers



| Driver (wrapper) | Note | Installation |

| ---------------- | ---- | ------------ |

| [ActiveX Data Objects](//github.com/mlaanderson/database-js-adodb) | *Windows only* | `npm i database-js-adodb` |

| [CSV files](//github.com/mlaanderson/database-js-csv) | | `npm i database-js-csv` |

| [Excel files](//github.com/mlaanderson/database-js-xlsx) | | `npm i database-js-xlsx` |

| [Firebase](//github.com/mlaanderson/database-js-firebase) | | `npm i database-js-firebase` |

| [INI files](//github.com/mlaanderson/database-js-ini) | | `npm i database-js-ini` |

| [JSON files](//github.com/thiagodp/database-js-json) | | `npm i database-js-json` |

| [MySQL](//github.com/mlaanderson/database-js-mysql) | prior to MySQL v8 | `npm i database-js-mysql` |

| [MySQL2](//github.com/esteban-serfe/database-js-mysql2/) | MySQL v8+ | `npm i database-js-mysql2` |

| [MS SQL Server](https://github.com/thiagodp/database-js-mssql) | | `npm i database-js-mssql` |

| [PostgreSQL](//github.com/mlaanderson/database-js-postgres) | | `npm i database-js-postgres` |

| [SQLite3](//github.com/thiagodp/database-js-sqlite3) | | `npm i database-js-sqlite3` |

| [SQLite](//github.com/mlaanderson/database-js-sqlite) | | `npm i database-js-sqlite` |



[See here](//github.com/mlaanderson/database-js/wiki/Drivers#implementing-a-new-driver) how to add a new driver.



## Usage



Usage _without_ async/await:



```javascript

var Connection = require('database-js').Connection;



// CONNECTION

var conn =

	new Connection("sqlite:///path/to/test.sqlite");               // SQLite

	// new Connection("mysql://user:password@localhost/test");     // MySQL

	// new Connection("postgres://user:password@localhost/test");  // PostgreSQL

	// 👉 Change the connection string according to the database driver



// QUERY

var stmt1 = conn.prepareStatement("SELECT * FROM city WHERE name = ?");

stmt1.query("New York")

	.then( function (results) {

		console.log(results); // Display the results

	} ).catch( function (reason) {

		console.log(reason); // Some problem while performing the query

	} );



// COMMAND

var stmt2 = conn.prepareStatement("INSERT INTO city (name, population) VALUES (?, ?)");

stmt2.execute("Rio de Janeiro", 6747815)

	.then( function() { console.log( 'Inserted.' ); } )

	.catch( function(reason) { console.log('Error: ' + reason); } );



// ANOTHER COMMAND

var stmt3 = conn.prepareStatement("UPDATE city SET population = population + ? WHERE name = ?");

stmt3.execute(1, "Rio de Janeiro")

	.then( function() { console.log( 'Updated.' ); } )

	.catch( function(reason) { console.log('Error: ' + reason); } );



// CLOSING THE CONNECTION

conn.close()

	.then( function() { console.log('Closed.'); } )

	.catch( function(reason) { console.log('Error: ' + reason); } );

```



### Async / await



Using async/await:



```javascript

const Connection = require('database-js').Connection;



(async () => {

	let conn;

	try {

		// CONNECTION

		conn = new Connection('mysql://user:password@localhost/test');



		// QUERY

		const stmt1 = conn.prepareStatement('SELECT * FROM city WHERE name = ?');

		const results = await stmt1.query('New York');

		console.log(results);



		// COMMAND 1

		const stmt2 = conn.prepareStatement('INSERT INTO city (name, population) VALUES (?,?)');

		await stmt1.execute('Rio de Janeiro', 6747815);



		// COMMAND 2

		const stmt2 = conn.prepareStatement('UPDATE city SET population = population + ? WHERE name = ?');

		await stmt1.execute(1, 'Rio de Janeiro');

	} catch (reason) {

		console.log(reason);

	} finally {

		try {

			await conn.close();

		} catch (err) {

			console.log(err);

		}

	}

})();

```



## Basic API



```ts

class Connection {



	/** Creates and prepares a statement with the given SQL. */

	prepareStatement(sql: string): PreparedStatement;



	/** Closes the underlying connection. */

	close(): Promise;



	/** Indicates whether the underlying driver support transactions. */

	isTransactionSupported(): boolean;



	/** Returns true if the underlying driver is in a transaction, false otherwise. */

	inTransaction(): boolean;



	/**

	 * Starts a transaction (if supported).

	 *

	 * Transactions can fail to start if another transaction is already running or

	 * if the driver does not support transactions.

	 */

	beginTransaction(): Promise;



	/**

	 * Commits a transaction (if supported).

	 *

	 * Transactions can fail to commit if no transaction was started, or if the driver

	 * does not support transactions.

	 */

	commit(): Promise;



	/**

	 * Cancels a transaction (if supported).

	 *

	 * Transaction can fail to be rolled back no transaction was started, or if the driver

	 * does not support transactions.

	 */

	rollback(): Promise;

}

```



```ts

class PreparedStatement {

	/**

	 * Performs the prepared SQL query with the given arguments.

	 * Returns a Promise with an array of rows.

	 */

	query(...args: any): Promise>;



	/** Executes the prepared SQL statement with the given arguments. */

	execute(... args): Promise;

}

```



## See also



- [Wiki](https://github.com/mlaanderson/database-js/wiki) for more examples and how to use a connection pool.



- [codeceptjs-dbhelper](https://github.com/thiagodp/codeceptjs-dbhelper) - Allows to use [database-js](https://github.com/mlaanderson/database-js) inside [CodeceptJS](https://github.com/codeception/codeceptjs/) tests (as a helper).



## License



[MIT](LICENSE)