Class: AlRdbwMysql

Inherits:
AlRdbw show all
Defined in:
lib/al_rdbw_mysql.rb,
lib/al_persist_mysql.rb

Overview

リレーショナルデータベースラッパー MySQL版

Instance Attribute Summary

Attributes inherited from AlRdbw

#fields, #flag_transaction, #handle, #select_data_type, #select_fetch_mode

Instance Method Summary collapse

Methods inherited from AlRdbw

#close, connect, #get_handle, inherited, #initialize, #transaction_active?

Constructor Details

This class inherits a constructor from AlRdbw

Instance Method Details

#[](tname) ⇒ AlPersistMysql

tableを指定して、Persistオブジェクトを生成 syntax sugar

Parameters:

  • tname (String) —

    テーブル名

Returns:



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# File 'lib/al_persist_mysql.rb', line 53

def []( tname )
  return AlPersistMysql.new( self, tname )
end

#commit ⇒ Boolean

TODO:

トランザクションコミット

実装中。トランザクションがSQLレベルで失敗する条件をテストして返り値に反映する

Returns:

  • (Boolean) —

    成否



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# File 'lib/al_rdbw_mysql.rb', line 300

def commit()
  return false  if ! @flag_transaction
  get_handle().query( "commit;" )
  @flag_transaction = false
  return true
end

#delete(table, where_cond) ⇒ Hash

delete文の発行ヘルパー

Parameters:

  • table (String) —

    テーブル名

  • where_cond (Hash) —

    where条件

Returns:

  • (Hash) —

    結果のHash



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# File 'lib/al_rdbw_mysql.rb', line 269

def delete( table, where_cond )
  (where, wval) = make_where_condition( where_cond )
  sql = "delete from #{table} where #{where};"

  stmt = get_handle().prepare( sql )
  stmt.execute( *wval )
  ret = { :cmdtuples=>stmt.affected_rows() }
  stmt.close()
  return ret
end

#execute(sql, var = []) ⇒ Hash Also known as: exec

Note:

任意SQLの実行

アクションクエリの実行用。selectは、select()メソッドを使う。

Parameters:

  • sql (String) —

    SQL文

  • var (Array) (defaults to: []) —

    パラメータクエリ用変数

Returns:

  • (Hash) —

    結果



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# File 'lib/al_rdbw_mysql.rb', line 47

def execute( sql, var = [] )
  # MySQLでは、"lock tables" 等は、query()でしか実行できない。
  begin
    stmt = get_handle().prepare( sql )
  rescue Mysql::Error => ex
    raise ex  if ex.errno != Mysql::Error::ER_UNSUPPORTED_PS
    raise ex  if ! var.empty?
    get_handle().query( sql )
    return {}
  end

  stmt.execute( *var )
  ret = { :cmdtuples=>stmt.affected_rows(), :insert_id=>stmt.insert_id() }
  stmt.close()
  return ret
end

#insert(table, values) ⇒ Hash

insert文の発行ヘルパー

Parameters:

  • table (String) —

    テーブル名

  • values (Hash) —

    insertする値のhash

Returns:

  • (Hash) —

    結果のHash



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# File 'lib/al_rdbw_mysql.rb', line 204

def insert( table, values )
  col = ""
  plh = ""
  val = []
  values.each do |k,v|
    col << "#{k},"
    plh << "?,"
    if v.class == Array
      val << v.join( ',' )
    else
      val << v
    end
  end
  col.chop!
  plh.chop!

  sql = "insert into #{table} (#{col}) values (#{plh});"
  stmt = get_handle().prepare( sql )
  stmt.execute( *val )
  ret = { :cmdtuples=>stmt.affected_rows(), :insert_id=>stmt.insert_id() }
  stmt.close()
  return ret
end

#normalize_data_type(f, d) ⇒ Object 



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# File 'lib/al_rdbw_mysql.rb', line 177

def normalize_data_type( f, d )
  case d
  when String
    d.force_encoding( AL_CHARSET )

  when Mysql::Time
    case f.type
    when Mysql::Field::TYPE_TIME
      d = Time.new( 1, 1, 1, d.hour, d.minute, d.second )
    when Mysql::Field::TYPE_DATE
      d = (d.year == 0) ? nil : Time.new( d.year, d.month, d.day, 0, 0, 0 )
    when Mysql::Field::TYPE_TIMESTAMP, Mysql::Field::TYPE_DATETIME
      d = (d.year == 0) ? nil : Time.new( d.year, d.month, d.day, d.hour, d.minute, d.second )
    end
  end

  return d
end

#open_connection ⇒ Object

RDBサーバとのコネクションを開始する



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# File 'lib/al_rdbw_mysql.rb', line 23

def open_connection()
  return false  if ! @dsn

  @handle = Mysql::init()
  @handle.options( Mysql::SET_CHARSET_NAME, "utf8" )  # can't use  AL_CHARSET. what to do?
  @handle.options( Mysql::OPT_CONNECT_TIMEOUT, 10 )

  @handle.connect( @dsn[:host], @dsn[:user],
     @dsn[:passwd], @dsn[:db], @dsn[:port],
     @dsn[:sock], @dsn[:flag] )

  @dsn = nil
end

#rollback ⇒ Boolean

トランザクションロールバック

Returns:

  • (Boolean) —

    成否



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# File 'lib/al_rdbw_mysql.rb', line 313

def rollback()
  return false  if ! @flag_transaction
  get_handle().query( "rollback;" )
  @flag_transaction = false
  return true
end

#select(sql, where_cond = nil) ⇒ Array<Hash>

select文の発行ヘルパー

Examples:

where condition
use Array
 select( "select * from t1 where id=?;", [2] )
use Hash
 select( "select * from t1 _WHERE_;",
   { :id=>2, :age=>nil, "name like"=>"a%" } )

Parameters:

  • sql (String) —

    SQL文

  • where_cond (Array, Hash) (defaults to: nil) —

    where条件

Returns:

  • (Array<Hash>) —

    結果の配列



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# File 'lib/al_rdbw_mysql.rb', line 80

def select( sql, where_cond = nil )
  case where_cond
  when NilClass
    @stmt = get_handle().prepare( sql )
    @stmt.execute()

  when Array
    @stmt = get_handle().prepare( sql )
    @stmt.execute( *where_cond )

  when Hash
    s = sql.split( '_WHERE_' )
    raise "SQL error in select()"  if s.size != 2
    (where, val) = make_where_condition( where_cond )
    @stmt = get_handle().prepare( "#{s[0]} where #{where} #{s[1]}" )
    @stmt.execute( *val )

  when String
    sql.sub!( '_WHERE_', "where #{where_cond}" )
    @stmt = get_handle().prepare( sql )
    @stmt.execute()

  else
    raise "where_cond error in AlRdbwMysql#select()"
  end

  # get field name
  @fields_m = @stmt.result_metadata().fetch_fields()
  @fields = @fields_m.map {|field| field.name.to_sym }

  # get data (row mode)
  return select_next()  if @select_fetch_mode == :ROW

  # get data all
  ret = []
  case @select_data_type
  when :ARRAY         # Array<Array>で返す
    @stmt.each {|row|
      row.size.times {|i|
        row[i] = normalize_data_type( @fields_m[i], row[i] )
      }
      ret << row
    }

  else                # Array<Hash>で返す（標準）
    @stmt.each {|row|
      r = {}
      row.each_with_index {|d,i|
        r[ @fields[i] ] = normalize_data_type( @fields_m[i], d )
      }
      ret << r
    }
  end

  @stmt.close()
  @stmt = nil
  return ret
end

#select_next ⇒ Array, ...

シングル行モード(select_fetch_mode = :ROW)の場合の次行取得

res = @db.select( sql ) p @db.fields while res

p res
res = db.select_next()

end

Returns:

  • (Array, Hash, Nil) —

    結果



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# File 'lib/al_rdbw_mysql.rb', line 151

def select_next()
  return nil  if !@stmt
  row = @stmt.fetch()
  if !row
    @stmt.close()
    @stmt = nil
    @fields_m = nil
    return nil
  end

  case @select_data_type
  when :ARRAY
    row.size.times {|i|
      row[i] = normalize_data_type( @fields_m[i], row[i] )
    }
    return row

  else
    ret = {}
    row.each_with_index {|d,i|
      ret[ @fields[i] ] = normalize_data_type( @fields_m[i], d )
    }
    return ret
  end
end

#table(tname, pkey = nil) ⇒ AlPersistMysql

tableを指定して、Persistオブジェクトを生成

Parameters:

  • tname (String) —

    テーブル名

  • pkey (Array<String,Symbol>, String, Symbol) (defaults to: nil) —

    プライマリキー

Returns:



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# File 'lib/al_persist_mysql.rb', line 43

def table( tname, pkey = nil )
  return AlPersistMysql.new( self, tname, pkey )
end

#transaction ⇒ Boolean

トランザクション開始

Returns:

  • (Boolean) —

    成否



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# File 'lib/al_rdbw_mysql.rb', line 286

def transaction()
  return false  if @flag_transaction
  get_handle().query( "begin;" )
  return @flag_transaction = true
end

#update(table, values, where_cond) ⇒ Hash

update文の発行ヘルパー

Parameters:

  • table (String) —

    テーブル名

  • values (Hash) —

    updateする値のhash

  • where_cond (Hash) —

    where条件

Returns:

  • (Hash) —

    結果のHash



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# File 'lib/al_rdbw_mysql.rb', line 237

def update( table, values, where_cond )
  columns = ""
  val = []
  values.each do |k,v|
    columns << "#{k}=?,"
    if v.class == Array
      val << v.join( ',' )
    else
      val << v
    end
  end
  columns.chop!

  (where, wval) = make_where_condition( where_cond )
  sql = "update #{table} set #{columns} where #{where};"
  val += wval

  stmt = get_handle().prepare( sql )
  stmt.execute( *val )
  ret = { :cmdtuples=>stmt.affected_rows() }
  stmt.close()
  return ret
end