Establishing a Connection
As discussed in the DataContext section, each
DataContext implementation
exposes a connect
method. It takes a single
ConnectionOptions
parameter. Assuming you’ve followed the tutorial and defined your connection
options in a root-level connections.json
object (see the Connection
Options section), code for establishing a
connection will look as follows.
import { MySQLDataContext, ConnectionOptions } from 'formn';
async function main() {
// Load ConnectionOptions from a JSON file.
const connOpts: ConnectionOptions = require('../../connections.json');
// Initialize a DataContext instance for MySQL.
const dataContext = new MySQLDataContext();
// Attempt to connect. Log an error on failure, and end the connection on
// completion.
try {
await dataContext.connect(connOpts);
console.log('Connected!');
}
catch(err) {
console.error('Failed to connect.');
console.error(err);
}
finally {
await dataContext.end();
}
}
main();
The above example can be found in the formn-example repository under
src/connection/connect.ts
.
Run it with ts-node:
npx ts-node ./src/connection/connect.ts