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Asynchronous, non-blocking SQLite3 bindings for Node.js

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README.md

NAME

node-sqlite - Asynchronous SQLite3 driver for Node.js

SQLite calls block, so to work around this, synchronous calls happen within Node's libeio thread-pool, in a similar manner to how POSIX calls are currently made.

SYNOPSIS

High-level Driver

var sys    = require('sys'),
    sqlite = require('sqlite');

var db = new sqlite.Database();

// open the database for reading if file exists
// create new database file if not

db.open("aquateen.db", function (error) {
  if (error) {
      console.log("Tonight. You."));
      throw error;
  }
  db.execute
    ( "INSERT INTO aqua_teens (name) VALUES (?)"
    , ['meaty meaty moo']
    , function (error, rows) {
        if (error) throw error;
        console.log("Aqua teen added.");
      }
    );
  var sql = 'SELECT name FROM dudes WHERE type = ? AND age > ?';

  db.prepare(sql, function (error, statement) {
    if (error) throw error;

    // Fill in the placeholders
    statement.bindArray(['milkshake', 30], function () {

      statement.fetchAll(function (error, rows) {
        // ...
        statement.finalize(function (error) {
          console.log("All done!");
        });
      });
    });
  });
});

API

Database Objects

To create a new database object: var sqlite = require('sqlite');

var db = sqlite.Database();

database.open(filename, function (error) {})

Open a database handle to the database at the specified filename. If the file does not exist the bindings will attempt to create it. The callback takes no arguments.

A filename of ":memory:" may be used to create an in-memory database.

database.close(function (error) {})

Close the database handle.

database.execute(sql[, bindings], function (error, rows) {})

Execute a SQL query, sql with optional bindings bindings on the currently opened database. The callback will be executed once with all the rows returned for the query. This is much faster than database.query since there are less roundtrips into the thread-pool.

database.query(sql, [bindings,] function (error, row) {})

Execute a SQL query, sql, with optional bindings bindings on the currently opened database. The callback will be executed once per row returned, plus once more with row set to undefined to indicate end of results.

database.executeScript(SQL, function (error) {});

db.executeScript
  (   "CREATE TABLE table1 (id, name);"
    + "CREATE TABLE table2 (id, age);"
    + "INSERT INTO table1 (1, 'Mister Shake');"
    + "INSER INTO table2 (1, 34);"
  , function (error) {
      if (error) throw error;
      // ...
    });

Execute multiple semi-colon separated SQL statements. Statements must take no placeholders. Each statement will be executed with a single step() and then reset. This is ideally suited to executing multiple DDL statements.

database.prepare(SQL, [options,] function (error, statement) {})

Create a prepared statement from an SQL string. Prepared statements can be used used to iterate over results and to avoid compiling SQL each time a query is performed.

Options:

  • lastInsertRowID: boolean, default false. If true, when this statement is step()'d over, the context object (this) in the callback will contain a lastInsertRowID member with the ID of the last inserted row.

  • affectedRows: boolean, default false. If true, when this statement is step()'d over, the context object (this) in the callback will contain an affectedRows member with the number of affected rows for the last step.

Statement Objects

statement.bindArray(array, function (error) {})

statement.bindArray([1, 'robots', 4.20], callback)

Bind array items to place-holder values (? or $foo) in statement.

statement.bindObject(object, function (error) {})

statement.bindObject({ $name: 'meatwad',
                       $occupation: 'Former detective' }, callback)

Bind object properties to named place-holder values ($foo, $bar, $baz) in statement.

statement.bind(position, value, function (error) {})

statement.bind(1, "tango", function (error) {})

Bind a value to a place-holder position. Because binding place-holders is done by position (not index), the first place-holder is at position 1, second at place-holder position 2, etc.

statement.clearBindings()

Immediately clear the bindings from the statement. There is no callback.

statement.step(function (error, row) {})

Fetch one row from a prepared statement and hand it off to a callback. If there are no more rows to be fetched, row will be undefined. Rows are represented as objects with properties named after the respective columns.

statement.fetchAll(function (error, rows) {})

Fetch all rows in statement and pass them to the callback as an array of objects, each object representing one row.

statement.reset()

Immediately reset a statement object back to it's initial state, ready to be step() or fetchAll()'d again.

statement.finalize(function (error) {})

Free SQLite objects associated with this statement and mark it for garbage collection.

Supported Types

At the moment, the supported types are TEXT, NUMBER, FLOAT and NULL.

BUILDING

To obtain and build the bindings:

git clone http://github.com/orlandov/node-sqlite.git
cd node-sqlite
node-waf configure build

TESTS

Running the unit tests could not be easier. Simply:

git submodule update --init
./run-tests

SEE ALSO

AUTHORS

Orlando Vazquez [ovazquez@gmail.com]

Ryan Dahl [ry@tinyclouds.org]

THANKS

Many thanks to Eric Fredricksen for his synchronous driver on which this driver was originally based.

LICENSE

node-sqlite is BSD licensed.

(c) 2010 Orlando Vazquez

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