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docs: add an example of a nullable ORM field (#20292)

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Juan de Bruin 2023-12-28 18:27:59 +02:00 • committed by GitHub
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@ -4977,10 +4977,10 @@ import db.sqlite
// sets a custom table name. Default is struct name (case-sensitive)
@[table: 'customers']
struct Customer {
id int @[primary; sql: serial] // a field named `id` of integer type must be the first field
id int @[primary; sql: serial] // a field named `id` of integer type must be the first field
name string
nr_orders int
country string
country ?string
}
db := sqlite.connect('customers.db')!
@ -4989,8 +4989,8 @@ db := sqlite.connect('customers.db')!
// CREATE TABLE IF NOT EXISTS `Customer` (
// `id` INTEGER PRIMARY KEY,
// `name` TEXT NOT NULL,
// `nr_orders` INTEGER,
// `country` TEXT NOT NULL
// `nr_orders` INTEGER NOT NULL,
// `country` TEXT
// )
sql db {
create table Customer
@ -5015,6 +5015,15 @@ sql db {
insert us_customer into Customer
}!
none_country_customer := Customer{
name: 'Dennis'
country: none
nr_orders: 2
}
sql db {
insert none_country_customer into Customer
}!
// update a customer:
sql db {
update Customer set nr_orders = nr_orders + 1 where name == 'Bob'
@ -5030,9 +5039,17 @@ println('number of all customers: ${nr_customers}')
uk_customers := sql db {
select from Customer where country == 'uk' && nr_orders > 0
}!
println('We found a total of ${uk_customers.len} customers, that match the query.')
for customer in uk_customers {
println('customer: ${customer.id}, ${customer.name}, ${customer.country}, ${customer.nr_orders}')
println('We found a total of ${uk_customers.len} customers matching the query.')
for c in uk_customers {
println('customer: ${c.id}, ${c.name}, ${c.country}, ${c.nr_orders}')
}
none_country_customers := sql db {
select from Customer where country is none
}!
println('We found a total of ${none_country_customers.len} customers, with no country set.')
for c in none_country_customers {
println('customer: ${c.id}, ${c.name}, ${c.country}, ${c.nr_orders}')
}
// delete a customer