Ruby with MySQL Establishing Connections real_connect(host, user, passwd, db, table) Return client version information get_client_info() client_info() get_server_info() server_info() Return server version information.

query(q) do query. If query do not return result, return nil. affected_rows() return number of affected rows. num_rows() return number of rows. close() close connection.

fetch_row() return array of field value. fetch_hash() return hash of pair of field name and field value. if with_table Is true, hash key is table+"."+fieldname. stat() return server status. list_tables() return array of table name.

stat()

return server status.

list_tables()

return array of table name.

Example 1 require 'rubygems' require 'mysql' mysql = Mysql.real_connect("localhost", "root", "", "test") mysql.query("DROP TABLE IF EXISTS rocks") mysql.query("CREATE TABLE rocks (id INT UNSIGNED NOT NULL AUTO_INCREMENT, PRIMARY KEY (id), rockname CHAR(20) NOT NULL);") mysql.query("INSERT INTO rocks (rockname) values('Granite');") mysql.query("INSERT INTO rocks (rockname) values('Coal');") mysql.query("INSERT INTO rocks (rockname) values('Quartz');") mysql.close()

Example 2 require 'rubygems' require ‘mysql’ mysql = Mysql.real_connect("localhost", "root", "", "test") res = mysql.query("select * from rocks") puts mysql.stat() # return status of server puts mysql.list_tables # return array of table name. puts mysql.get_server_info() # return server info res.each do |row| col1 = row[0] col2 = row[1] puts col1 puts col2 end

Example 3 require 'rubygems' require ‘mysql’ mysql = Mysql.real_connect("localhost", "root", "", "test") res = mysql.query("SELECT * FROM rocks") while row = res.fetch_hash do printf "%s, %s
", row["id"], row["rockname"] end puts "Number of rows returned: #{res.num_rows}"