Class: Baza::Driver::Mysql

Inherits:
BaseSqlDriver show all
Defined in:
lib/baza/drivers/mysql.rb

Defined Under Namespace

Classes: Column, Columns, Index, Indexes, Result, Sqlspecs, Table, Tables, UnbufferedResult

Instance Attribute Summary collapse

Attributes inherited from BaseSqlDriver

#baza, #cols, #indexes, #sep_col, #sep_table, #sep_val, #tables

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from BaseSqlDriver

#esc_col, #escape

Constructor Details

#initialize(baza) ⇒ Mysql

Returns a new instance of Mysql.



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# File 'lib/baza/drivers/mysql.rb', line 20

def initialize(baza)
  super

  @opts = @baza.opts

  require 'monitor'
  @mutex = Monitor.new

  if baza.opts[:conn]
    @conn = baza.opts[:conn]
  else
    if @opts[:encoding]
      @encoding = @opts[:encoding]
    else
      @encoding = 'utf8'
    end

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

    reconnect
  end
end

Instance Attribute Details

#conn ⇒ Object (readonly)

Returns the value of attribute conn.



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# File 'lib/baza/drivers/mysql.rb', line 14

def conn
  @conn
end

Class Method Details

.from_object(args) ⇒ Object 



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# File 'lib/baza/drivers/mysql.rb', line 16

def self.from_object(args)
  raise 'Mysql does not support auth extraction' if args[:object].class.name == 'Mysql'
end

Instance Method Details

#clean ⇒ Object

Cleans the wref-map holding the tables.



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# File 'lib/baza/drivers/mysql.rb', line 58

def clean
  tables.clean if tables
end

#close ⇒ Object

Closes the connection threadsafe.



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# File 'lib/baza/drivers/mysql.rb', line 117

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

#destroy ⇒ Object

Destroyes the connection.



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# File 'lib/baza/drivers/mysql.rb', line 122

def destroy
  @conn = nil
  @baza = nil
  @mutex = nil
  @subtype = nil
  @encoding = nil
  @query_args = nil
  @port = nil
end

#escape_alternative(string) ⇒ Object

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



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# File 'lib/baza/drivers/mysql.rb', line 107

def escape_alternative(string)
  return @conn.escape_string(string.to_s)
end

#insert_multi(tablename, arr_hashes, args = nil) ⇒ Object

Inserts multiple rows in a table. Can return the inserted IDs if asked to in arguments.



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# File 'lib/baza/drivers/mysql.rb', line 133

def insert_multi(tablename, arr_hashes, args = nil)
  sql = "INSERT INTO `#{tablename}` ("

  first = true
  if args && args[:keys]
    keys = args[:keys]
  elsif arr_hashes.first.is_a?(Hash)
    keys = arr_hashes.first.keys
  else
    raise "Could not figure out keys."
  end

  keys.each do |col_name|
    sql << "," unless first
    first = false if first
    sql << "`#{self.esc_col(col_name)}`"
  end

  sql << ") VALUES ("

  first = true
  arr_hashes.each do |hash|
    if first
      first = false
    else
      sql << "),("
    end

    first_key = true
    if hash.is_a?(Array)
      hash.each do |val|
        if first_key
          first_key = false
        else
          sql << ","
        end

        sql << @baza.sqlval(val)
      end
    else
      hash.each do |key, val|
        if first_key
          first_key = false
        else
          sql << ","
        end

        sql << @baza.sqlval(val)
      end
    end
  end

  sql << ")"

  return sql if args && args[:return_sql]

  self.query(sql)

  if args && args[:return_id]
    first_id = self.last_id
    raise "Invalid ID: #{first_id}" if first_id.to_i <= 0
    ids = [first_id]
    1.upto(arr_hashes.length - 1) do |count|
      ids << first_id + count
    end

    ids_length = ids.length
    arr_hashes_length = arr_hashes.length
    raise "Invalid length (#{ids_length}, #{arr_hashes_length})." unless ids_length == arr_hashes_length

    return ids
  else
    return nil
  end
end

#java_mysql_resultset_killer(id) ⇒ Object

This method handels the closing of statements and results for the Java MySQL-mode.



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# File 'lib/baza/drivers/mysql.rb', line 48

def java_mysql_resultset_killer(id)
  data = @java_rs_data[id]
  return nil unless data

  data[:res].close
  data[:stmt].close
  @java_rs_data.delete(id)
end

#last_id ⇒ Object

Returns the last inserted ID for the connection.



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# File 'lib/baza/drivers/mysql.rb', line 112

def last_id
  @mutex.synchronize { return @conn.insert_id.to_i }
end

#query(str) ⇒ Object

Executes a query and returns the result.



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# File 'lib/baza/drivers/mysql.rb', line 72

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

  begin
    tries += 1
    @mutex.synchronize do
      return Baza::Driver::Mysql::Result.new(self, @conn.query(str))
    end
  rescue => e
    if tries <= 3
      if e.message == "MySQL server has gone away" || e.message == "closed MySQL connection" or 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") or e.message == "This connection is still waiting for a result, try again once you have the result" or e.message == "Lock wait timeout exceeded; try restarting transaction"
        reconnect
        retry
      end
    end

    raise e
  end
end

#query_ubuf(str) ⇒ Object

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



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# File 'lib/baza/drivers/mysql.rb', line 99

def query_ubuf(str)
  @mutex.synchronize do
    @conn.query_with_result = false
    return Baza::Driver::Mysql::UnbufferedResult.new(@conn, @opts, @conn.query(str))
  end
end

#reconnect ⇒ Object

Respawns the connection to the MySQL-database.



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# File 'lib/baza/drivers/mysql.rb', line 63

def reconnect
  @mutex.synchronize do
    require 'mysql' unless ::Object.const_defined?(:Mysql)
    @conn = ::Mysql.real_connect(@baza.opts[:host], @baza.opts[:user], @baza.opts[:pass], @baza.opts[:db], @port)
    query("SET NAMES '#{self.esc(@encoding)}'") if @encoding
  end
end

#transaction ⇒ Object 



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# File 'lib/baza/drivers/mysql.rb', line 209

def transaction
  @baza.q("START TRANSACTION")

  begin
    yield @baza
    @baza.q("COMMIT")
  rescue
    @baza.q("ROLLBACK")
    raise
  end
end