57 lines
1.6 KiB
Go
57 lines
1.6 KiB
Go
module main
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import pg
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struct Customer {
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id int
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name string
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nr_orders int
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country string
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}
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fn main() {
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db := pg.connect(pg.Config{host: '127.0.0.1' user: 'myuser' dbname: 'mydb'})
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nr_customers := db.select count from Customer
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println('Total customers: $nr_customers')
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// V syntax can be used to build queries
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println('------------------------------------------------------------------------')
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bg_customers := db.select from Customer where country == 'Bulgaria' && id != 2
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for customer in bg_customers {
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println('$customer.country | $customer.id - $customer.name')
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}
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println('------------------------------------------------------------------------')
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ru_customers := db.select from Customer where country == 'Russia'
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for customer in ru_customers {
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println('$customer.country | $customer.id - $customer.name')
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}
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// by adding `limit 1` we tell V that there will be only one object
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println('------------------------------------------------------------------------')
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existing := db.select from Customer where id == 1 limit 1 or { panic(err) }
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println('Existing customer name: $existing.name')
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println('Existing customer full information:')
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println(existing)
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println('------------------------------------------------------------------------')
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q := Customer{}
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for {
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anon := db.select from Customer where id == 12345 && name == q.name && nr_orders > q.nr_orders limit 1 or { eprintln('No such customer. Error: $err') break }
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println('Non existing customer name: $anon.name')
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break
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}
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// TODO: insert a new customer
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/*
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nc := Customer{
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name: 'John Doe'
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nr_orders: 10
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}
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db.insert(nc)
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*/
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}
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