About this Tutorial , Hello World , Loops , Branching , Containers , Arrays , Hashes , Strings ,Regular Expressions , Subroutines ,Exceptions ,Terminal IO ,File IO , How OOP is Ruby? , Object Oriented Progr

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* About this Tutorial …

* About this Tutorial
* Hello World
* Loops
* Branching
* Containers
* Arrays
* Hashes
* Strings
* Regular Expressions
* Subroutines
* Exceptions
* Terminal IO
* File IO
* How OOP is Ruby?
* Object Oriented Programming Concepts
* Simple OOP in Ruby

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  • 1. 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.
  • 2. 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.
  • 3. 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.
  • 4. 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()
  • 5. 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
  • 6. 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}"