db.sqlite: make functions return results, breaking change (#19093)

examples/database/sqlite.v

@@ -2,20 +2,19 @@ import db.sqlite
 
 fn main() {
 	db := sqlite.connect(':memory:')!
-	db.exec("create table users (id integer primary key, name text default '');")
+	db.exec("create table users (id integer primary key, name text default '');") or { panic(err) }
 
-	db.exec("insert into users (name) values ('Sam')")
-	db.exec("insert into users (name) values ('Peter')")
-	db.exec("insert into users (name) values ('Kate')")
+	db.exec("insert into users (name) values ('Sam')")!
+	db.exec("insert into users (name) values ('Peter')")!
+	db.exec("insert into users (name) values ('Kate')")!
 
-	nr_users := db.q_int('select count(*) from users')
+	nr_users := db.q_int('select count(*) from users')!
 	println('nr users = ${nr_users}')
 
-	name := db.q_string('select name from users where id = 1')
+	name := db.q_string('select name from users where id = 1')!
 	assert name == 'Sam'
 
-	users, code := db.exec('select * from users')
-	println('SQL Result code: ${code}')
+	users := db.exec('select * from users')!
 	for row in users {
 		println(row.vals)
 	}

examples/vwatch/web_server/main.v

@@ -44,8 +44,8 @@ pub fn (mut app App) index() vweb.Result {
 
 fn (mut app App) update_db() !int {
 	mut db := mydb()!
-	db.exec('INSERT INTO visits (created_at) VALUES ("")')
-	visits := db.q_int('SELECT count(*) FROM visits')
+	db.exec('INSERT INTO visits (created_at) VALUES ("")')!
+	visits := db.q_int('SELECT count(*) FROM visits')!
 	db.close()!
 	return visits
 }
@@ -56,10 +56,10 @@ fn main() {
 	println('`v -d vweb_livereload watch --keep run examples/vwatch/web_server/`')
 	println('')
 	mut db := mydb()!
-	db.exec('CREATE TABLE visits (id integer primary key AUTOINCREMENT, created_at timestamp default current_timestamp);')
+	db.exec('CREATE TABLE visits (id integer primary key AUTOINCREMENT, created_at timestamp default current_timestamp);')!
 	db.exec('CREATE TRIGGER INSERT_visits AFTER INSERT ON visits BEGIN
 	  UPDATE visits SET created_at = datetime("now", "localtime") WHERE rowid = new.rowid ;
-	END')
+		END')!
 	db.close()!
 	vweb.run(&App{}, 19123)
 }