Class: DB::MySQL::Native::Connection

Inherits:
FFI::Pointer
  • Object
show all
Defined in:
lib/db/mysql/native/connection.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(address, io) ⇒ Connection

Returns a new instance of Connection.



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# File 'lib/db/mysql/native/connection.rb', line 97

def initialize(address, io)
  super(address)
  
  @io = io
  @result = nil
end

Class Method Details

.connect(connection_string = "", io: ::IO) ⇒ Object 



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# File 'lib/db/mysql/native/connection.rb', line 57

def self.connect(connection_string = "", io: ::IO)
  pointer = Native.mysql_init(nil)
  Native.mysql_options(pointer, MYSQL_OPT_NONBLOCK, nil)
  
  uri = URI(connection_string)
  host = uri.host
  user = uri.user
  password = uri.password
  database = uri.path.gsub(/^\//, '')
  port = uri.port || 0
  unix_socket = nil
  client_flags = CLIENT_MULTI_STATEMENT | CLIENT_MULTI_RESULTS
  
  result = FFI::MemoryPointer.new(:pointer)
  
  status = Native.mysql_real_connect_start(result, pointer, host, user, password, database, port, unix_socket, client_flags);
  
  if status > 0
    io = io.new(Native.mysql_get_socket(pointer), "r+")
    
    while status > 0
      if status & MYSQL_WAIT_READ
        io.wait_readable
      elsif status & MYSQL_WAIT_WRITE
        io.wait_writable
      else
        io.wait_any
      end
      
      status = Native.mysql_real_connect_cont(result, pointer, status)
    end
  end
  
  if result.read_pointer.null?
    raise "Could not connect: #{Native.mysql_error(pointer)}!"
  end
  
  return self.new(pointer, io)
end

Instance Method Details

#check_error!(message) ⇒ Object 



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# File 'lib/db/mysql/native/connection.rb', line 112

def check_error!(message)
  if Native.mysql_errno(self) != 0
    raise "#{message}: #{Native.mysql_error(self)}!"
  end
end

#close ⇒ Object 



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# File 'lib/db/mysql/native/connection.rb', line 130

def close
  self.free_result
  
  Native.mysql_close(self)
  
  @io.close
end

#free_result ⇒ Object 



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# File 'lib/db/mysql/native/connection.rb', line 122

def free_result
  if @result
    Native.mysql_free_result(@result)
    
    @result = nil
  end
end

#next_result ⇒ Object 



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# File 'lib/db/mysql/native/connection.rb', line 156

def next_result
  if @result
    self.free_result
    
    # Successful and there are no more results:
    return if Native.mysql_next_result(self) == -1
    
    check_error!("Next result")
  end
  
  @result = Native.mysql_use_result(self)
  
  if @result.null?
    check_error!("Next result")
    
    return nil
  else
    return Result.new(self, @result)
  end
end

#send_query(statement) ⇒ Object 



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# File 'lib/db/mysql/native/connection.rb', line 138

def send_query(statement)
  self.free_result
  
  error = FFI::MemoryPointer.new(:int)
  
  status = Native.mysql_real_query_start(error, self, statement, statement.bytesize)
  
  while status != 0
    self.wait_for(status)
    
    status = Native.mysql_real_query_cont(error, self, status)
  end
  
  if error.read_int != 0
    raise "Could not send query: #{Native.mysql_error(self)}!"
  end
end

#status ⇒ Object 



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# File 'lib/db/mysql/native/connection.rb', line 118

def status
  Native.mysql_stat(self)
end

#wait_for(status) ⇒ Object 



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# File 'lib/db/mysql/native/connection.rb', line 104

def wait_for(status)
  if status & MYSQL_WAIT_READ
    @io.wait_readable
  elsif status & MYSQL_WAIT_WRITE
    @io.wait_writable
  end
end