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Clean up README
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orlandov committed Sep 25, 2010
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node-sqlite - Asynchronous SQLite3 driver for Node.js

This distribution includes two SQLite libraries: a low level driver
written in C++ and a high level driver. The latter wraps the former to add
simpler API.

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. SQLite's serialized threading mode is used to make sure we
use SQLite safely. See http://www.sqlite.org/threadsafe.html for more info.
currently made.

# SYNOPSIS

## High-level Driver

High-level bindings provide a simple interface to SQLite3. They should be
fast enough for most purposes, but if you absolutely need more performance,
the low level drivers are also straight-forward to use, but require a few
additional steps.

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

Expand All @@ -28,66 +18,21 @@ additional steps.
// open the database for reading if file exists
// create new database file if not

db.open("lilponies.db", function () {
var colour = 'pink';
var sql = 'SELECT name FROM ponies WHERE hair_colour = ?';

// bindings list is optional

var ponies = [];

db.query(sql, [colour], function (error, pony) {
if (error) throw error;
if (!pony) {
// no more ponies
if (!ponies.length)
sys.puts('There are no ponies with ' + colour + ' tails. :(');
else
sys.puts('The following ponies have ' + colour + ' tails: ' + ponies.join(', '));
}
sys.puts(sys.inspect(pony));
ponies.push(pony);
});
});

## Low-level Driver

The low-level bindings directly interface with the SQLite C API. The API
approximately matches the SQLite3 API when it makes sense.

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("lilponies.db", function () {
var colour = 'pink';
var sql = 'SELECT name FROM ponies' +
' WHERE hair_colour = $hair_colour' +
' AND gemstones = ?';

var ponies = [];
db.open("aquateen.db", function (error) {
if (error) {
console.log("Purple Alert! Aqua Teen Database unabled to be opened!"));
throw error;
}
var sql = 'SELECT name FROM dudes WHERE type = ? AND age > ?';

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

// Fill in the placeholders
// Could also have used:
// statement.bind(position, value, function () { ... });
// statement.bindObject({ $hair_colour: 'pink' }, function () {});
statement.bindArray(['pink', 4], function () {

// call step once per row result
statement.step(function (error, row) {
if (!row) {
// end of rows
}

// do some stuff
// call statement.step() again for next row
statement.bindArray(['milkshake', 30], function () {

statement.fetchAll(function (error, rows) {
// ...
});
});
});
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## Database Objects

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

var db = sqlite.Database();

Expand All @@ -113,6 +59,12 @@ A filename of ":memory:" may be used to create an in-memory database.

Close the database handle.

### 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
Expand All @@ -126,25 +78,24 @@ Close the database handle.
});

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

Options:

- lastInsertRowID: boolean, default false.
If true, when this statement is stepped over, the context object (this) in
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 stepped over, the context object (this) in
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.

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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.
represented as objects with properties named after the respective columns.

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

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