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node_modules |
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var path = require('path') | ||
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var resultPath = path.dirname(require.resolve('pg.js')) + '/lib/result' | ||
var Result = require(resultPath) | ||
var Client = require('pg.js').Client | ||
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var Cursor = function(text, values) { | ||
this.text = text | ||
this.values = values | ||
this._connection = null | ||
} | ||
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Cursor.prototype._connect = function(cb) { | ||
if(this._connected) return setImmediate(cb); | ||
this._connected = true | ||
var self = this | ||
var client = new Client() | ||
client.connect(function(err) { | ||
if(err) return cb(err); | ||
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//remove all listeners from | ||
//client's connection and discard the client | ||
self.connection = client.connection | ||
self.connection.removeAllListeners() | ||
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var con = self.connection | ||
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con.parse({ | ||
text: self.text | ||
}, true) | ||
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con.bind({ | ||
values: self.values | ||
}, true) | ||
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con.describe({ | ||
type: 'P', | ||
name: '' //use unamed portal | ||
}, true) | ||
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con.flush() | ||
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var onError = function(err) { | ||
cb(err) | ||
con.end() | ||
} | ||
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con.once('error', onError) | ||
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con.on('rowDescription', function(msg) { | ||
self.rowDescription = msg | ||
con.removeListener('error', onError) | ||
cb(null, con) | ||
}) | ||
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var onRow = function(msg) { | ||
var row = self.result.parseRow(msg.fields) | ||
self.result.addRow(row) | ||
} | ||
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con.on('dataRow', onRow) | ||
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con.once('readyForQuery', function() { | ||
con.end() | ||
}) | ||
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con.once('commandComplete', function() { | ||
self._complete = true | ||
con.sync() | ||
}) | ||
}) | ||
} | ||
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Cursor.prototype._getRows = function(con, n, cb) { | ||
if(this._done) { | ||
return cb(null, [], false) | ||
} | ||
var msg = { | ||
portal: '', | ||
rows: n | ||
} | ||
con.execute(msg, true) | ||
con.flush() | ||
this.result = new Result() | ||
this.result.addFields(this.rowDescription.fields) | ||
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var self = this | ||
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var onComplete = function() { | ||
self._done = true | ||
cb(null, self.result.rows, self.result) | ||
} | ||
con.once('commandComplete', onComplete) | ||
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con.once('portalSuspended', function() { | ||
cb(null, self.result.rows, self.result) | ||
con.removeListener('commandComplete', onComplete) | ||
}) | ||
} | ||
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Cursor.prototype.end = function(cb) { | ||
this.connection.end() | ||
this.connection.stream.once('end', cb) | ||
} | ||
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Cursor.prototype.read = function(rows, cb) { | ||
var self = this | ||
this._connect(function(err) { | ||
if(err) return cb(err); | ||
self._getRows(self.connection, rows, cb) | ||
}) | ||
} | ||
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module.exports = function(query, params) { | ||
return new Cursor(query, params) | ||
} |
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{ | ||
"name": "node-pg-cursor", | ||
"version": "0.0.0", | ||
"description": "", | ||
"main": "index.js", | ||
"directories": { | ||
"test": "test" | ||
}, | ||
"scripts": { | ||
"test": "echo \"Error: no test specified\" && exit 1" | ||
}, | ||
"author": "", | ||
"license": "BSD", | ||
"devDependencies": { | ||
"gonna": "0.0.0" | ||
}, | ||
"dependencies": { | ||
"pg.js": "~2.7.0" | ||
} | ||
} |
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var assert = require('assert') | ||
var pgCursor = require('../') | ||
var gonna = require('gonna') | ||
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var text = 'SELECT generate_series as num FROM generate_series(0, 5)' | ||
var values = [] | ||
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var test = function(name, fn, timeout) { | ||
timeout = timeout || 1000 | ||
var done = gonna(name, timeout, function(err) { | ||
console.log(name) | ||
assert.ifError(err) | ||
}) | ||
fn(done) | ||
} | ||
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test('fetch 6 when asking for 10', function(done) { | ||
var cursor = pgCursor(text) | ||
cursor.read(10, function(err, res) { | ||
assert.ifError(err) | ||
assert.equal(res.length, 6) | ||
done() | ||
}) | ||
}) | ||
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test('end before reading to end', function(done) { | ||
var cursor = pgCursor(text) | ||
cursor.read(3, function(err, res) { | ||
assert.equal(res.length, 3) | ||
cursor.end(done) | ||
}) | ||
}) | ||
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test('callback with error', function(done) { | ||
var cursor = pgCursor('select asdfasdf') | ||
cursor.read(1, function(err) { | ||
assert(err) | ||
done() | ||
}) | ||
}) | ||
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test('read a partial chunk of data', function(done) { | ||
var cursor = pgCursor(text) | ||
cursor.read(2, function(err, res) { | ||
assert.equal(res.length, 2) | ||
cursor.read(3, function(err, res) { | ||
assert.equal(res.length, 3) | ||
cursor.read(1, function(err, res) { | ||
assert.equal(res.length, 1) | ||
cursor.read(1, function(err, res) { | ||
assert.ifError(err) | ||
assert.strictEqual(res.length, 0) | ||
done() | ||
}) | ||
}) | ||
}) | ||
}) | ||
}) | ||
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test('read return length 0 past the end', function(done) { | ||
var cursor = pgCursor(text) | ||
cursor.read(2, function(err, res) { | ||
cursor.read(100, function(err, res) { | ||
assert.equal(res.length, 4) | ||
cursor.read(100, function(err, res) { | ||
assert.equal(res.length, 0) | ||
done() | ||
}) | ||
}) | ||
}) | ||
}) | ||
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test('read huge result', function(done) { | ||
var text = 'SELECT generate_series as num FROM generate_series(0, 1000000)' | ||
var values = [] | ||
cursor = pgCursor(text, values); | ||
var count = 0; | ||
var more = function() { | ||
cursor.read(1000, function(err, rows) { | ||
if(err) return done(err); | ||
if(!rows.length) { | ||
assert.equal(count, 1000001) | ||
return done() | ||
} | ||
count += rows.length; | ||
if(count%100000 == 0) { | ||
console.log(count) | ||
} | ||
setImmediate(more) | ||
}) | ||
} | ||
more() | ||
}, 100000) |