Query Builders
Most of the libraries includes some methods for debugging the calls being executed.
Knex Query Builder for PostgreSQL, MySQL, CockroachDB, MSSQL, SQLite3, Oracle.
const knex = require('knex')({
client: 'sqlite3',
connection: {
filename: './data.db',
},
});
try {
// Create a table
await knex.schema
.createTable('users', table => {
table.increments('id');
table.string('user_name');
})
// ...and another
.createTable('accounts', table => {
table.increments('id');
table.string('account_name');
table
.integer('user_id')
.unsigned()
.references('users.id');
})
// Then query the table...
const insertedRows = await knex('users').insert({ user_name: 'Tim' })
// ...and using the insert id, insert into the other table.
await knex('accounts').insert({ account_name: 'knex', user_id: insertedRows[0] })
// Query both of the rows.
const selectedRows = await knex('users')
.join('accounts', 'users.id', 'accounts.user_id')
.select('users.user_name as user', 'accounts.account_name as account')
// map over the results
const enrichedRows = selectedRows.map(row => ({ ...row, active: true }))
// Finally, add a catch statement
} catch(e) {
console.error(e);
};