func usage() {
	fmt.Println("Jet generator 2.8.0")
	fmt.Println()
	fmt.Println("Usage:")

	order := []string{
		"source", "dsn", "host", "port", "user", "password", "dbname", "schema", "params", "sslmode",
		"path",
		"ignore-tables", "ignore-views", "ignore-enums",
	}

	for _, name := range order {
		flagEntry := flag.CommandLine.Lookup(name)
		fmt.Printf("  -%s\n", flagEntry.Name)
		fmt.Printf("\t%s\n", flagEntry.Usage)
	}

	fmt.Println()
	fmt.Println(`Example command:

	$ jet -dsn=postgresql://jet:jet@localhost:5432/jetdb?sslmode=disable -schema=dvds -path=./gen
	$ jet -dsn=postgres://jet:jet@localhost:26257/jetdb?sslmode=disable -schema=dvds -path=./gen   #cockroachdb
	$ jet -source=postgres -dsn="user=jet password=jet host=localhost port=5432 dbname=jetdb" -schema=dvds -path=./gen
	$ jet -source=mysql -host=localhost -port=3306 -user=jet -password=jet -dbname=jetdb -path=./gen
	$ jet -source=sqlite -dsn="file://path/to/sqlite/database/file" -path=./gen
		`)
}