SQLite in memory

---

examples/sqlite/in_memory.cr

require "sqlite3"

DB.open "sqlite3://%3Amemory%3A" do |db|
  db.exec "CREATE TABLE data (
        id INTEGER PRIMARY KEY,
        name TEXT,
        yesno BOOLEAN,
        number INTEGER,
        start DATETIME
    )"
  db.exec "INSERT INTO data (name, yesno, number, start) VALUES (?, ?, ?, ?)",
    "Foo", true, 42, Time.utc
  name = db.scalar "SELECT name FROM data"
  puts name
  puts typeof(name)
  puts name.to_s + " and Bar"

  number = db.scalar "SELECT number FROM data"
  puts number
  puts typeof(number)
  puts number.to_s.to_i + 1

  db.exec "INSERT INTO data (name, yesno, number, start) VALUES (?, ?, ?, ?)",
    "Bar", false, 23, Time.utc
  name = db.scalar "SELECT name FROM data"
  puts name

  count = db.scalar "SELECT COUNT(*) FROM data"
  puts count
  puts typeof(count)

  puts db.scalar "SELECT name FROM sqlite_schema"
  db.query_all "SELECT name, type FROM sqlite_schema" do |line|
    puts line
    puts line.read
    puts line.read
  end
end