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 Method Summary (collapse)

Methods inherited from AlRdbw

connect, connect_suitable, #get_handle, #initialize, #transaction_active?

Constructor Details

This class inherits a constructor from AlRdbw

Instance Method Details

- (AlPersistMysql) [](tname)

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

Parameters:

  • (String) tname

    テーブル名

Returns:



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# File 'lib/al_persist_mysql.rb', line 52

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

- (Boolean) commit

TODO:

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

トランザクションコミット

Returns:

  • (Boolean)

    成否



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# File 'lib/al_rdbw_mysql.rb', line 249

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

- (Hash) delete(table, where_cond)

delete文の発行ヘルパー

Parameters:

  • (String) table

    テーブル名

  • (Hash) where_cond

    where条件

Returns:

  • (Hash)

    結果のHash



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# File 'lib/al_rdbw_mysql.rb', line 215

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 = {}
  ret[:cmdtuples] = stmt.affected_rows()

  stmt.close()
  return ret
end

- (Hash) insert(table, values)

insert文の発行ヘルパー

Parameters:

  • (String) table

    テーブル名

  • (Hash) values

    insertする値のhash

Returns:

  • (Hash)

    結果のHash



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# File 'lib/al_rdbw_mysql.rb', line 144

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 = {}
  ret[:cmdtuples] = stmt.affected_rows()

  stmt.close()
  return ret
end

- (Object) open_connection

Note:

conn_strは、他では文字列だが、MySQLではHashである。

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 26

def open_connection()
  return false  if ! @conn_str

  @handle = Mysql::connect( @conn_str[:host], @conn_str[:user], @conn_str[:passwd], @conn_str[:db], @conn_str[:port], @conn_str[:sock], @conn_str[:flag] )
  @conn_str = nil
end

- (Boolean) rollback

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 262

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

- (Array<Hash>) run(sql, var = [])

任意SQLの実行

Parameters:

  • (String) sql

    SQL文

  • (Array) var (defaults to: [])

    パラメータクエリ用変数

Returns:

  • (Array<Hash>)

    結果



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# File 'lib/al_rdbw_mysql.rb', line 41

def run( sql, var = [] )
  ret = []

  if var.empty?
    return get_handle().query( sql )
  end

  stmt = get_handle().prepare( sql )
  stmt.execute( *var )

  fields = stmt.().fetch_fields()

  stmt.each do |datas|
    idx = 0
    r = {}
    datas.each do |d|
      if d.class == Mysql::Time
        r[ fields[idx].name.to_sym ] = Time.local( d.year, d.month, d.day, d.hour, d.minute, d.second )
      else
        r[ fields[idx].name.to_sym ] = d
      end
      idx += 1
    end
    ret << r
  end

  stmt.close()
  return ret
end

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

select文の発行ヘルパー

use Hash

 select( "select * from t1 _WHERE_;",
   { :id=>2, :age=>nil, "name like"=>"a%" } )

Examples:

where condition
use Array
select( "select * from t1 where id=$1;", [2] )

Parameters:

  • (String) sql

    SQL文

  • (Array, Hash) where_cond (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 86

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 )

  else
    raise "where_cond error in select()"
  end

  #
  # データの取り出しとデータタイプの変換
  #  TODO: if type is bool?
  #
  ret = []
  fields = stmt.().fetch_fields()

  stmt.each do |datas|
    idx = 0
    r = {}
    datas.each do |d|
      case d
      when Mysql::Time
        r[ fields[idx].name.to_sym ] = Time.local( d.year, d.month, d.day, d.hour, d.minute, d.second )
      when String
        d.force_encoding( AL_CHARSET )
        r[ fields[idx].name.to_sym ] = d
      else
        r[ fields[idx].name.to_sym ] = d
      end
      idx += 1
    end
    ret << r
  end

  stmt.close()
  return ret
end

- (AlPersistMysql) table(tname, pkey = nil)

tableを指定して、Persistオブジェクトを生成

Parameters:

  • (String) tname

    テーブル名

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

    プライマリキー

Returns:



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# File 'lib/al_persist_mysql.rb', line 42

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

- (Boolean) transaction

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 235

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

- (Hash) update(table, values, where_cond)

update文の発行ヘルパー

Parameters:

  • (String) table

    テーブル名

  • (Hash) values

    updateする値のhash

  • (Hash) where_cond

    where条件

Returns:

  • (Hash)

    結果のHash



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# File 'lib/al_rdbw_mysql.rb', line 180

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 = {}
  ret[:cmdtuples] = stmt.affected_rows()

  stmt.close()
  return ret
end