pg-promise-strict
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    1.2.8 • Public • Published

    pg-promise-strict

    postgresql with promises and strict types and returning size of results

    stable npm-version downloads build windows coverage outdated-deps

    language: English also available in: Spanish

    Features

    PG Promise/A+ in the strict way:

    • The same functions, with the same name and same retunrs that in PG, but without callbacks
    • covers 100% by test.
    • 100% coded in typescript
    • No reimplement nothing that PG does
    • Some additions for comfort

    Install

    $ npm install pg-promise-strict

    Use example

    var pg = require('pg-promise-strict');
    
    var conOpts = {
        user: 'test_user',
        password: 'test_pass',
        database: 'test_db',
        host: 'localhost',
        port: 5432
    };
    
    pg.connect(conOpts).then(function(client){
        return client.query('select * from table').execute().then(function(result){
            for(var i=0; i<result.rowCount; i++){
                console.log('row',i,result.rows[i]);
            }
            client.done();
        });
    }).catch(function(err){
        console.log('ERROR',err);
    });

    Examples of PG

    The first easy example. One simple query that returns all rows. Example based in PG

    var pg = require('pg-promise-strict');
    
    var conString = "postgres://username:password@localhost/database";
    
    try{
        var client = await pg.connect(conString)
        var result = await client.query('SELECT $1::int AS number', ['1']).fetchAll();
        console.log(result.rows[0].number);
    }catch(err){
        console.error('error fetching client from pool or running query', err);
    };

    In this example you see:

    • async calls
    • parameters passed to libpq in the query function
    • the fetchAll function that convirms that you want all rows.

    Example without connection pool

    Corresponds to calls to PG direct client instance

    var pg = require('pg-promise-strict');
    
    var conString = "postgres://username:password@localhost/database";
    
    var client = new pg.Client(conString);
    
    try{
        await client.connect();
        var result = await client.query('SELECT NOW() AS "theTime"').fetchAll();
        console.log(result.rows[0].theTime);
        console.log(row.name);
        client.done();
    }catch(err){
        console.error('error connecting or running query', err);
    });

    Example with fetch row by row

    Corresponds to calls to PG.query without callback. In PG documentation Brian C says do not provide callback function for large result sets unless you're okay with loading the entire result set into memory

    This is the way for process data row by row

    var client = await pg.connect({user: 'brianc', database: 'test'});
    await client.query("SELECT name FROM users").onRow(function(row){
        console.log(row.name);
    });
    client.done();
    console.log('ready.');

    In this example you see:

    • the on-row callback
    • the await until the query has finished

    Running the examples

    In the examples directory the create_db.sql script can be used to create de test database. In the same directory there are the example slightly modified.

    Running tests

    Clone the repository and install the developer dependencies in then normal way. You must provide a postgresql-9.3 instalation for create a test_db. Then you can test pg-promise-strict

    $ git clone git://github.com/codenautas/pg-promise-strict.git pg-promise-strict
    $ cd pg-promise-strict
    $ npm install
    $ psql --file test/create_db.sql
    $ npm test

    License

    MIT

    Keywords

    none

    Install

    npm i pg-promise-strict

    DownloadsWeekly Downloads

    90

    Version

    1.2.8

    License

    MIT

    Unpacked Size

    120 kB

    Total Files

    5

    Last publish

    Collaborators

    • estefi-capece
    • tute
    • u-gene