use jdbc

conn = getConnection("jdbc:sqlite:danboo.db")

st = conn.createStatement()
st.executeUpdate(
  "CREATE TABLE IF NOT EXISTS meta (
    prop      TEXT PRIMARY KEY,
    num_value INTEGER,
    str_value TEXT
  )")
st.executeUpdate(
  "INSERT OR IGNORE INTO meta(prop, num_value, str_value) VALUES('last_id', 0, '')")
st.close()

stGetNumValue = conn.prepareStatement(
  "SELECT num_value FROM meta WHERE prop = ?")
stSetNumValue = conn.prepareStatement(
  "UPDATE meta SET num_value = ? WHERE prop = ?")

def getLastPostId() {
  stGetNumValue.setString(1, "last_id")
  rs = stGetNumValue.executeQuery()
  return rs.getInt(1)
}

def setLastPostId(postId) {
  stSetNumValue.setInt(1, postId)
  stSetNumValue.setString(2, "last_id")
  stSetNumValue.executeUpdate()
}

def closeDB() {
  stGetNumValue.close()
  stSetNumValue.close()
  conn.close()
}