Getting Started with Apache Cassandra and Ruby

GettingStarted.rb

require 'cql'

# connect to the cluster
client = Cql::Client.connect(hosts: ['127.0.0.1'])
client.use('demo')

# insert a user
client.execute("INSERT INTO users (lastname, age, city, email, firstname) VALUES ('Jones', 35, 'Austin', 'bob@example.com', 'Bob')")

# Use select to get the user we just entered
rows = client.execute("SELECT firstname, age FROM users WHERE lastname='Jones'")
rows.each do |row|
  row.each do |key, value|
    puts "#{key} = #{value}"
  end
end

# Update the same user with a new age
client.execute("UPDATE users SET age = 36 WHERE lastname = 'Jones'")

# Select and show the change
rows = client.execute("SELECT firstname, age FROM users WHERE lastname='Jones'")
rows.each do |row|
  row.each do |key, value|
    puts "#{key} = #{value}"
  end
end

# Delete the user from the users table
client.execute("DELETE FROM users WHERE lastname = 'Jones'")

# Show that the user is gone
rows = client.execute("SELECT * FROM users")
rows.each do |row|
  row.each do |key, value|
    puts "#{key} = #{value}"
  end
end

# Close the connection
client.close