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Ammaar Reshi
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# pg-types
This is the code that turns all the raw text from postgres into JavaScript types for [node-postgres](https://github.com/brianc/node-postgres.git)
## use
This module is consumed and exported from the root `pg` object of node-postgres. To access it, do the following:
```js
var types = require('pg').types
```
Generally what you'll want to do is override how a specific data-type is parsed and turned into a JavaScript type. By default the PostgreSQL backend server returns everything as strings. Every data type corresponds to a unique `OID` within the server, and these `OIDs` are sent back with the query response. So, you need to match a particluar `OID` to a function you'd like to use to take the raw text input and produce a valid JavaScript object as a result. `null` values are never parsed.
Let's do something I commonly like to do on projects: return 64-bit integers `(int8)` as JavaScript integers. Because JavaScript doesn't have support for 64-bit integers node-postgres cannot confidently parse `int8` data type results as numbers because if you have a _huge_ number it will overflow and the result you'd get back from node-postgres would not be the result in the database. That would be a __very bad thing__ so node-postgres just returns `int8` results as strings and leaves the parsing up to you. Let's say that you know you don't and wont ever have numbers greater than `int4` in your database, but you're tired of receiving results from the `COUNT(*)` function as strings (because that function returns `int8`). You would do this:
```js
var types = require('pg').types
types.setTypeParser(20, function(val) {
return parseInt(val, 10)
})
```
__boom__: now you get numbers instead of strings.
Just as another example -- not saying this is a good idea -- let's say you want to return all dates from your database as [moment](http://momentjs.com/docs/) objects. Okay, do this:
```js
var types = require('pg').types
var moment = require('moment')
var parseFn = function(val) {
return val === null ? null : moment(val)
}
types.setTypeParser(types.builtins.TIMESTAMPTZ, parseFn)
types.setTypeParser(types.builtins.TIMESTAMP, parseFn)
```
_note: I've never done that with my dates, and I'm not 100% sure moment can parse all the date strings returned from postgres. It's just an example!_
If you're thinking "gee, this seems pretty handy, but how can I get a list of all the OIDs in the database and what they correspond to?!?!?!" worry not:
```bash
$ psql -c "select typname, oid, typarray from pg_type order by oid"
```
If you want to find out the OID of a specific type:
```bash
$ psql -c "select typname, oid, typarray from pg_type where typname = 'daterange' order by oid"
```
:smile:
## license
The MIT License (MIT)
Copyright (c) 2014 Brian M. Carlson
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.

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export enum builtins {
BOOL = 16,
BYTEA = 17,
CHAR = 18,
INT8 = 20,
INT2 = 21,
INT4 = 23,
REGPROC = 24,
TEXT = 25,
OID = 26,
TID = 27,
XID = 28,
CID = 29,
JSON = 114,
XML = 142,
PG_NODE_TREE = 194,
SMGR = 210,
PATH = 602,
POLYGON = 604,
CIDR = 650,
FLOAT4 = 700,
FLOAT8 = 701,
ABSTIME = 702,
RELTIME = 703,
TINTERVAL = 704,
CIRCLE = 718,
MACADDR8 = 774,
MONEY = 790,
MACADDR = 829,
INET = 869,
ACLITEM = 1033,
BPCHAR = 1042,
VARCHAR = 1043,
DATE = 1082,
TIME = 1083,
TIMESTAMP = 1114,
TIMESTAMPTZ = 1184,
INTERVAL = 1186,
TIMETZ = 1266,
BIT = 1560,
VARBIT = 1562,
NUMERIC = 1700,
REFCURSOR = 1790,
REGPROCEDURE = 2202,
REGOPER = 2203,
REGOPERATOR = 2204,
REGCLASS = 2205,
REGTYPE = 2206,
UUID = 2950,
TXID_SNAPSHOT = 2970,
PG_LSN = 3220,
PG_NDISTINCT = 3361,
PG_DEPENDENCIES = 3402,
TSVECTOR = 3614,
TSQUERY = 3615,
GTSVECTOR = 3642,
REGCONFIG = 3734,
REGDICTIONARY = 3769,
JSONB = 3802,
REGNAMESPACE = 4089,
REGROLE = 4096
}
export type TypeId = builtins;
export type TypesBuiltins = typeof builtins;
export type TypeParser<I extends (string | Buffer), T> = (value: I) => T;
export function setTypeParser<T>(oid: number | TypeId, parseFn: TypeParser<string, T>): void;
export function setTypeParser<T>(oid: number | TypeId, format: 'text', parseFn: TypeParser<string, T>): void;
export function setTypeParser<T>(oid: number | TypeId, format: 'binary', parseFn: TypeParser<Buffer, T>): void;
export function getTypeParser<T>(oid: number | TypeId): TypeParser<string, T | string>;
export function getTypeParser<T>(oid: number | TypeId, format: 'text'): TypeParser<string, T | string>;
export function getTypeParser<T>(oid: number | TypeId, format: 'binary'): TypeParser<Buffer, T | string>;

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const textParsers = require('./lib/textParsers')
const binaryParsers = require('./lib/binaryParsers')
const builtinTypes = require('./lib/builtins')
exports.getTypeParser = getTypeParser
exports.setTypeParser = setTypeParser
exports.builtins = builtinTypes
const typeParsers = {
text: {},
binary: {}
}
// the empty parse function
function noParse (val) {
return String(val)
};
// returns a function used to convert a specific type (specified by
// oid) into a result javascript type
// note: the oid can be obtained via the following sql query:
// SELECT oid FROM pg_type WHERE typname = 'TYPE_NAME_HERE';
function getTypeParser (oid, format) {
format = format || 'text'
if (!typeParsers[format]) {
return noParse
}
return typeParsers[format][oid] || noParse
};
function setTypeParser (oid, format, parseFn) {
if (typeof format === 'function') {
parseFn = format
format = 'text'
}
if (!Number.isInteger(oid)) {
throw new TypeError('oid must be an integer: ' + oid)
}
typeParsers[format][oid] = parseFn
};
textParsers.init(function (oid, converter) {
typeParsers.text[oid] = converter
})
binaryParsers.init(function (oid, converter) {
typeParsers.binary[oid] = converter
})

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const parseInt64 = require('pg-int8')
const parseNumeric = require('pg-numeric')
const parseInt16 = function (value) {
return value.readInt16BE(0)
}
const parseInt32 = function (value) {
return value.readInt32BE(0)
}
const parseFloat32 = function (value) {
return value.readFloatBE(0)
}
const parseFloat64 = function (value) {
return value.readDoubleBE(0)
}
const parseTimestampUTC = function (value) {
const rawValue = 0x100000000 * value.readInt32BE(0) + value.readUInt32BE(4)
// discard usecs and shift from 2000 to 1970
const result = new Date(Math.round(rawValue / 1000) + 946684800000)
return result
}
const parseArray = function (value) {
const dim = value.readInt32BE(0)
const elementType = value.readUInt32BE(8)
let offset = 12
const dims = []
for (let i = 0; i < dim; i++) {
// parse dimension
dims[i] = value.readInt32BE(offset)
offset += 4
// ignore lower bounds
offset += 4
}
const parseElement = function (elementType) {
// parse content length
const length = value.readInt32BE(offset)
offset += 4
// parse null values
if (length === -1) {
return null
}
let result
if (elementType === 0x17) {
// int
result = value.readInt32BE(offset)
offset += length
return result
} else if (elementType === 0x14) {
// bigint
result = parseInt64(value.slice(offset, offset += length))
return result
} else if (elementType === 0x19) {
// string
result = value.toString('utf8', offset, offset += length)
return result
} else {
throw new Error('ElementType not implemented: ' + elementType)
}
}
const parse = function (dimension, elementType) {
const array = []
let i
if (dimension.length > 1) {
const count = dimension.shift()
for (i = 0; i < count; i++) {
array[i] = parse(dimension, elementType)
}
dimension.unshift(count)
} else {
for (i = 0; i < dimension[0]; i++) {
array[i] = parseElement(elementType)
}
}
return array
}
return parse(dims, elementType)
}
const parseText = function (value) {
return value.toString('utf8')
}
const parseBool = function (value) {
return value[0] !== 0
}
const init = function (register) {
register(20, parseInt64)
register(21, parseInt16)
register(23, parseInt32)
register(26, parseInt32)
register(1700, parseNumeric)
register(700, parseFloat32)
register(701, parseFloat64)
register(16, parseBool)
register(1114, parseTimestampUTC)
register(1184, parseTimestampUTC)
register(1000, parseArray)
register(1007, parseArray)
register(1016, parseArray)
register(1008, parseArray)
register(1009, parseArray)
register(25, parseText)
}
module.exports = {
init: init
}

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/**
* Following query was used to generate this file:
SELECT json_object_agg(UPPER(PT.typname), PT.oid::int4 ORDER BY pt.oid)
FROM pg_type PT
WHERE typnamespace = (SELECT pgn.oid FROM pg_namespace pgn WHERE nspname = 'pg_catalog') -- Take only builting Postgres types with stable OID (extension types are not guaranted to be stable)
AND typtype = 'b' -- Only basic types
AND typelem = 0 -- Ignore aliases
AND typisdefined -- Ignore undefined types
*/
module.exports = {
BOOL: 16,
BYTEA: 17,
CHAR: 18,
INT8: 20,
INT2: 21,
INT4: 23,
REGPROC: 24,
TEXT: 25,
OID: 26,
TID: 27,
XID: 28,
CID: 29,
JSON: 114,
XML: 142,
PG_NODE_TREE: 194,
SMGR: 210,
PATH: 602,
POLYGON: 604,
CIDR: 650,
FLOAT4: 700,
FLOAT8: 701,
ABSTIME: 702,
RELTIME: 703,
TINTERVAL: 704,
CIRCLE: 718,
MACADDR8: 774,
MONEY: 790,
MACADDR: 829,
INET: 869,
ACLITEM: 1033,
BPCHAR: 1042,
VARCHAR: 1043,
DATE: 1082,
TIME: 1083,
TIMESTAMP: 1114,
TIMESTAMPTZ: 1184,
INTERVAL: 1186,
TIMETZ: 1266,
BIT: 1560,
VARBIT: 1562,
NUMERIC: 1700,
REFCURSOR: 1790,
REGPROCEDURE: 2202,
REGOPER: 2203,
REGOPERATOR: 2204,
REGCLASS: 2205,
REGTYPE: 2206,
UUID: 2950,
TXID_SNAPSHOT: 2970,
PG_LSN: 3220,
PG_NDISTINCT: 3361,
PG_DEPENDENCIES: 3402,
TSVECTOR: 3614,
TSQUERY: 3615,
GTSVECTOR: 3642,
REGCONFIG: 3734,
REGDICTIONARY: 3769,
JSONB: 3802,
REGNAMESPACE: 4089,
REGROLE: 4096
}

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const array = require('postgres-array')
const parseTimestampTz = require('postgres-date')
const parseInterval = require('postgres-interval')
const parseByteA = require('postgres-bytea')
const range = require('postgres-range')
function parseBool (value) {
return value === 'TRUE' ||
value === 't' ||
value === 'true' ||
value === 'y' ||
value === 'yes' ||
value === 'on' ||
value === '1'
}
function parseBoolArray (value) {
return array.parse(value, parseBool)
}
function parseIntegerArray (value) {
return array.parse(value, Number)
}
function parseBigIntegerArray (value) {
return array.parse(value, function (entry) {
return parseBigInteger(entry).trim()
})
}
const parsePointArray = function (value) {
return array.parse(value, parsePoint)
}
const parseFloatArray = function (value) {
return array.parse(value, parseFloat)
}
const parseStringArray = function (value) {
return array.parse(value, undefined)
}
const parseTimestamp = function (value) {
const utc = value.endsWith(' BC')
? value.slice(0, -3) + 'Z BC'
: value + 'Z'
return parseTimestampTz(utc)
}
const parseTimestampArray = function (value) {
return array.parse(value, parseTimestamp)
}
const parseTimestampTzArray = function (value) {
return array.parse(value, parseTimestampTz)
}
const parseIntervalArray = function (value) {
return array.parse(value, parseInterval)
}
const parseByteAArray = function (value) {
return array.parse(value, parseByteA)
}
const parseBigInteger = function (value) {
const valStr = String(value)
if (/^\d+$/.test(valStr)) { return valStr }
return value
}
const parseJsonArray = function (value) {
return array.parse(value, JSON.parse)
}
const parsePoint = function (value) {
if (value[0] !== '(') { return null }
value = value.substring(1, value.length - 1).split(',')
return {
x: parseFloat(value[0]),
y: parseFloat(value[1])
}
}
const parseCircle = function (value) {
if (value[0] !== '<' && value[1] !== '(') { return null }
let point = '('
let radius = ''
let pointParsed = false
for (let i = 2; i < value.length - 1; i++) {
if (!pointParsed) {
point += value[i]
}
if (value[i] === ')') {
pointParsed = true
continue
} else if (!pointParsed) {
continue
}
if (value[i] === ',') {
continue
}
radius += value[i]
}
const result = parsePoint(point)
result.radius = parseFloat(radius)
return result
}
function parseInt4Range (raw) {
return range.parse(raw, Number)
}
function parseNumRange (raw) {
return range.parse(raw, parseFloat)
}
function parseInt8Range (raw) {
return range.parse(raw, parseBigInteger)
}
function parseTimestampRange (raw) {
return range.parse(raw, parseTimestamp)
}
function parseTimestampTzRange (raw) {
return range.parse(raw, parseTimestampTz)
}
const init = function (register) {
register(20, parseBigInteger) // int8
register(21, Number) // int2
register(23, Number) // int4
register(26, Number) // oid
register(700, parseFloat) // float4/real
register(701, parseFloat) // float8/double
register(16, parseBool)
register(1114, parseTimestamp) // timestamp without time zone
register(1184, parseTimestampTz) // timestamp with time zone
register(600, parsePoint) // point
register(651, parseStringArray) // cidr[]
register(718, parseCircle) // circle
register(1000, parseBoolArray)
register(1001, parseByteAArray)
register(1005, parseIntegerArray) // _int2
register(1007, parseIntegerArray) // _int4
register(1028, parseIntegerArray) // oid[]
register(1016, parseBigIntegerArray) // _int8
register(1017, parsePointArray) // point[]
register(1021, parseFloatArray) // _float4
register(1022, parseFloatArray) // _float8
register(1231, parseStringArray) // _numeric
register(1014, parseStringArray) // char
register(1015, parseStringArray) // varchar
register(1008, parseStringArray)
register(1009, parseStringArray)
register(1040, parseStringArray) // macaddr[]
register(1041, parseStringArray) // inet[]
register(1115, parseTimestampArray) // timestamp without time zone[]
register(1182, parseStringArray) // date[]
register(1185, parseTimestampTzArray) // timestamp with time zone[]
register(1186, parseInterval)
register(1187, parseIntervalArray)
register(17, parseByteA)
register(114, JSON.parse) // json
register(3802, JSON.parse) // jsonb
register(199, parseJsonArray) // json[]
register(3807, parseJsonArray) // jsonb[]
register(3904, parseInt4Range) // int4range
register(3906, parseNumRange) // numrange
register(3907, parseStringArray) // numrange[]
register(3908, parseTimestampRange) // tsrange
register(3910, parseTimestampTzRange) // tstzrange
register(3912, range.parse) // daterange
register(3926, parseInt8Range) // int8range
register(2951, parseStringArray) // uuid[]
register(791, parseStringArray) // money[]
register(1183, parseStringArray) // time[]
register(1270, parseStringArray) // timetz[]
}
module.exports = {
init: init
}

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{
"name": "pg-types",
"version": "4.0.2",
"description": "Query result type converters for node-postgres",
"main": "index.js",
"scripts": {
"coverage": "nyc --reporter=html npm test && open-cli coverage/index.html",
"coverage-ci": "nyc --reporter=lcov npm test && codecov",
"lint": "standard",
"test": "tape test/*.js | tap-spec && npm run test-ts && npm run lint",
"test-ts": "tsd"
},
"repository": {
"type": "git",
"url": "git://github.com/brianc/node-pg-types.git"
},
"keywords": [
"postgres",
"PostgreSQL",
"pg"
],
"author": "Brian M. Carlson",
"license": "MIT",
"bugs": {
"url": "https://github.com/brianc/node-pg-types/issues"
},
"homepage": "https://github.com/brianc/node-pg-types",
"devDependencies": {
"@types/node": "^14.14.33",
"codecov": "^3.8.1",
"nyc": "^15.1.0",
"open-cli": "^6.0.1",
"standard": "^16.0.3",
"tap-spec": "^5.0.0",
"tape": "^5.2.2",
"tsd": "^0.14.0"
},
"dependencies": {
"pg-int8": "1.0.1",
"pg-numeric": "1.0.2",
"postgres-array": "~3.0.1",
"postgres-bytea": "~3.0.0",
"postgres-date": "~2.1.0",
"postgres-interval": "^3.0.0",
"postgres-range": "^1.1.1"
},
"files": [
"index.js",
"index.d.ts",
"lib"
],
"engines": {
"node": ">=10"
}
}