readdb

readdb

Get your database metadata info

readdb is a package to get database metadata such as tables, fields, foreign and primary keys.

install

On your console, run

npm install readdb --save

usage

First, you may require the readdb package

const readdb = require( 'readdb');

Then, instantiate a new readdb object and connect to your database usign the credentials like this

new readdb( 'database', 'user', 'password' )

To finally use the readdb class, you need to call the method setup. This method returns a promise with the configured readdb object

readdb.setup().then( readdb => {
    
    // now you con navigate through your database
    readdb.onTables( table => {
        
        // look, a table that i found
        console.log( table.name );
    });
})
.catch( err => {
    
    // something went wrong ......
    console.log( err );
});

Check the full exemple code

const readdb = require( 'readdb');

new readdb( 'database', 'user', 'password' ).setup().then( readdb => {
    
    // now you con navigate through your database
    readdb.onTables( table => {
        
        // look, a table that i found
        console.log( table.name );
    });
})
.catch( err => {
    
    // something went wrong ......
    console.log( err );
});

Reference

readb class

setup() set the database mapping onTables( callback ) executes a function for each table found on database table() gets a specific table of the database

table class

name: string name of the table onFields( callaback ) execute a function for each field of the table onForeignKeys( callback ) execute a function for each foreign key of the table onPrimaryKeys( callback ) execute a function for each primary key of the table

field class

name: string name of the field type: string the type of the field size: number the size of the field allowNull: boolean if the field allows null values defaultValue: string the default value for this field primaryKey: boolean if a field is a primary key or not

Instance options

When you instantiate a new readdb class, it accepts four params. They are: database: string the database name user: string the database user password: string the password option: object and object with some configuration. The fourth param, options, acceppts this properties

var db = new readdb('database', 'user', 'pass', {
    host: 'localhost',
    dialect: 'mysql'|'mariadb'|'sqlite'|'postgres'|'mssql',
    directory: false, // prevents the program from writing to disk
    port: 'port',
    additional: {
        timestamps: false
        //...
    },
    tables: ['table1', 'table2', 'table3']
    //...
})

Adapters

Readdb works with mysql as default, but it can run with mariadb, sqlite, postgres and mssql as well. To do this, you need install it's respective npm package.