Class: Baza::Driver::Mysql2

Inherits:
MysqlBaseDriver show all
Defined in:
lib/baza/driver/mysql2.rb

Defined Under Namespace

Classes: Column, Columns, Commands, Database, Databases, Index, Indexes, Result, Table, Tables, User, Users

Constant Summary

Constants inherited from BaseSqlDriver

BaseSqlDriver::SELECT_ARGS_ALLOWED_KEYS, BaseSqlDriver::SEPARATOR_COLUMN, BaseSqlDriver::SEPARATOR_DATABASE, BaseSqlDriver::SEPARATOR_INDEX, BaseSqlDriver::SEPARATOR_TABLE, BaseSqlDriver::SEPARATOR_VALUE

Instance Attribute Summary collapse

Attributes inherited from BaseSqlDriver

#cols, #db, #indexes, #sep_col, #sep_database, #sep_index, #sep_table, #sep_val, #tables

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from MysqlBaseDriver

args, #insert_multi, #transaction

Methods inherited from BaseSqlDriver

#count, #delete, escape, #escape_column, escape_column, #escape_database, escape_database, #escape_index, escape_index, #escape_table, escape_table, #foreign_key_support?, #insert, #insert_multi, #select, #single, #sql_make_where, sqlval, #sqlval, #supports_multiple_databases?, #transaction

Constructor Details

#initialize(db) ⇒ Mysql2

Returns a new instance of Mysql2.



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# File 'lib/baza/driver/mysql2.rb', line 26

def initialize(db)
  super

  @opts = @db.opts

  require "monitor"
  @mutex = Monitor.new

  if @opts[:encoding]
    @encoding = @opts[:encoding]
  else
    @encoding = "utf8"
  end

  if @db.opts.key?(:port)
    @port = @db.opts[:port].to_i
  else
    @port = 3306
  end

  reconnect
end

Instance Attribute Details

#conn ⇒ Object (readonly)

Returns the value of attribute conn.



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# File 'lib/baza/driver/mysql2.rb', line 6

def conn
  @conn
end

#conns ⇒ Object (readonly)

Returns the value of attribute conns.



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# File 'lib/baza/driver/mysql2.rb', line 6

def conns
  @conns
end

Class Method Details

.from_object(args) ⇒ Object

Helper to enable automatic registering of database using Baza::Db.from_object



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# File 'lib/baza/driver/mysql2.rb', line 9

def self.from_object(args)
  if args[:object].class.name == "Mysql2::Client"
    return {
      type: :success,
      args: {
        type: :mysql2,
        conn: args[:object],
        query_args: {
          symbolize_keys: true
        }
      }
    }
  end

  nil
end

Instance Method Details

#clean ⇒ Object

Cleans the wref-map holding the tables.



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# File 'lib/baza/driver/mysql2.rb', line 50

def clean
  tables.clean if tables
end

#close ⇒ Object

Closes the connection threadsafe.



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# File 'lib/baza/driver/mysql2.rb', line 131

def close
  @mutex.synchronize { @conn.close }
end

#destroy ⇒ Object

Destroyes the connection.



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# File 'lib/baza/driver/mysql2.rb', line 136

def destroy
  @conn = nil
  @db = nil
  @mutex = nil
  @encoding = nil
  @query_args = nil
  @port = nil
end

#escape(string) ⇒ Object

Escapes a string to be safe to use in a query.



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# File 'lib/baza/driver/mysql2.rb', line 126

def escape(string)
  @conn.escape(string.to_s)
end

#query(str) ⇒ Object

Executes a query and returns the result.



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# File 'lib/baza/driver/mysql2.rb', line 92

def query(str)
  str = str.to_s
  str = str.force_encoding("UTF-8") if @encoding == "utf8" && str.respond_to?(:force_encoding)
  tries = 0

  begin
    tries += 1
    @mutex.synchronize do
      return Baza::Driver::Mysql2::Result.new(self, @conn.query(str, @query_args))
    end
  rescue => e
    if tries <= 3
      if e.message == "MySQL server has gone away" || e.message == "closed MySQL connection" || e.message == "Can't connect to local MySQL server through socket"
        sleep 0.5
        reconnect
        retry
      elsif e.message.include?("No operations allowed after connection closed") || e.message == "This connection is still waiting for a result, try again once you have the result" || e.message == "Lock wait timeout exceeded; try restarting transaction"
        reconnect
        retry
      end
    end

    raise e
  end
end

#query_ubuf(str, _args = nil, &_blk) ⇒ Object

Executes an unbuffered query and returns the result that can be used to access the data.



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# File 'lib/baza/driver/mysql2.rb', line 119

def query_ubuf(str, _args = nil, &_blk)
  @mutex.synchronize do
    return Baza::Driver::Mysql2::Result.new(self, @conn.query(str, @query_args.merge(stream: true)))
  end
end

#reconnect ⇒ Object

Respawns the connection to the MySQL-database.



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# File 'lib/baza/driver/mysql2.rb', line 55

def reconnect
  @mutex.synchronize do
    require "mysql2" unless ::Object.const_defined?("Mysql2")

    args = {
      host: @db.opts[:host],
      username: @db.opts[:user],
      password: @db.opts[:pass],
      database: @db.opts[:db],
      port: @port,
      symbolize_keys: true,
      cache_rows: false
    }

    # Symbolize keys should also be given here, else table-data wont be symbolized for some reason - knj.
    @query_args = {symbolize_keys: true}
    @query_args[:cast] = false unless @db.opts[:type_translation]
    @query_args.merge!(@db.opts[:query_args]) if @db.opts[:query_args]

    pos_args = [:as, :async, :cast_booleans, :database_timezone, :application_timezone, :cache_rows, :connect_flags, :cast]
    pos_args.each do |key|
      args[key] = @db.opts[key] if @db.opts.key?(key)
    end

    args[:as] = :array

    if @db.opts[:conn]
      @conn = @db.opts[:conn]
    else
      @conn = ::Mysql2::Client.new(args)
    end

    query("SET NAMES '#{esc(@encoding)}'") if @encoding
  end
end