livetex-node-pg

Livetex-Node-Pg

Multithreaded Postgres driver for Node-JS built with libpq and libjemalloc.

####Install via npm: npm install livetex-node-pg

Examples

Simple query processing

var pg = require('livetex-node-pg');

pg.init(20, {
  'user': 'postgres',
  'dbname': 'postgres',
  'hostaddr': '127.0.0.1',
  'password': 'postgres'
});

pg.exec("SELECT 1 AS value", function(table) {
  console.log('Result table:', table);
}, console.error);

pg.exec("SELECT 2 AS another_value", function(table) {
  console.log('Result table:', table);
}, console.error);

You don't have to wait any connection ready events before calling exec or any other method.

Process destroying

var pg = require('livetex-node-pg');

pg.init(20, {
  'user': 'postgres',
  'dbname': 'postgres',
  'hostaddr': '127.0.0.1',
  'password': 'postgres'
});

pg.exec("SELECT 1 AS value", function(table) {
  console.log('Result table:', table);
}, console.error);

pg.destroy();

Nothing happen after destroy call.

Prepared queries

var pg = require('livetex-node-pg');
var preparedQuery = "SELECT $word1 AS word1, $word2 AS word2";

pg.init(20, {
  'user': 'postgres',
  'dbname': 'postgres',
  'hostaddr': '127.0.0.1',
  'password': 'postgres'
});

pg.execPrepared(preparedQuery, {
  'word1': 'hello',
  'word2': 'world'
}, function(table) {
  console.log('Result table:', table);
}, console.error);

pg.execPrepared(preparedQuery, {
  'word1': 'bye',
  'word2': 'bye'
}, function(table) {
  console.log('Result table:', table);
}, console.error);

You can pass different params to one prepared query.

API

Type definitions

• pg.Row:Object.<string, (number|string|boolean|null)> - Table result row definition.
• pg.Table:Array.<!pg.Row> - Definition of query result table.
• pg.ResultHandler:?function(pg.Table) - Definition of function type to handle query execution result. Function argument - query result table.
• pg.ErrorHandler:?function(string, number=) - Definition of function type to handle errors. Function arguments are error message string and optional error code.
• pg.PreparedValue:?(number|string|boolean) - Definition of value types for insertion to prepared query.
• pg.PreparedParams:Object.<string, (!pg.PreparedValue|!Array.<!pg.PreparedValue>)> - Definition of data object for query preparation.

Methods

pg.escapeString:string

Escapes strings in sql queries. For string escape we use dollar-quoting.

Arguments:

• string:string Original string.

Returns escaped string.

pg.escapeArray:string

Escapes array of values. Array is casted to string of escaped elements divided by comma.

Arguments:

• array:!Array.<!pg.PreparedValue> Array of values.

Returns escaped strings divided by comma.

pg.init: void

Initializes connections pool.

Arguments:

• size: number Pool size - Count of pool connections.
• options: !Object Connection options. Options must be an object with keys specified in documentation.
• opt_errorHandler: !pg.ErrorHandler= Connection error handler. console.error will be used by default.

pg.exec: void

Executes SQL-query.

Arguments:

• query: string SQL-query string.
• complete: !pg.ResultHandler Success result handler.
• cancel: !pg.ErrorHandler Execution error handler.

pg.execPrepared: void

Executes prepared SQL-query.

Arguments:

• query: string Prepared SQL-query string.
• params: !pg.PreparedParams Data object for query preparation.
• complete: !pg.ResultHandler Success result handler.
• cancel: !pg.ErrorHandler Execution error handler.

pg.prepareQuery: string

Prepares ready-to-use SQL-query.

Arguments:

• query: string Prepared SQL-query string.
• params: !pg.PreparedParams Data object for query preparation.

Returns ready-to-use SQL-query.

pg.destroy: void

Destroys connection pool.

License

Modified BSD License