ruby 红宝石的MySQLによるDB接続

Posted 2021-05-16

# gem install mysqlが必要
# rbenv環境ならrbenv exec gem install mysqlしてから
# rbenv exec ruby hoge.rbで実行
require 'mysql'
client= Mysql.connect('hostname', 'username', 'password', 'dbname')
client.query("SELECT col1, col2 FROM tblname").each do |col1, col2|
  p col1, col2
end
stmt = client.prepare('SELECT value1, value2 FROM table1 WHERE key1 = ? AND key2 = ?')
begin
  result = stmt.execute(123, 'abc')
  result.each do |tuple|
    puts tuple[0]  # value1 の値
    puts tuple[1]  # value2 の値
  end
ensure
  stmt.close
end