Class: AlRdbwSqlite

Inherits:
AlRdbw show all
Defined in:
lib/al_rdbw_sqlite.rb,
lib/al_persist_sqlite.rb

Overview

リレーショナルデータベースラッパー SQLite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) ⇒ AlPersistSqlite

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_sqlite.rb', line 53

def []( tname )
  return AlPersistSqlite.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_sqlite.rb', line 240

def commit()
  return false  if ! @flag_transaction
  get_handle().execute( "commit transaction;" )
  @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_sqlite.rb', line 212

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

  return { :cmdtuples=>handle.changes() }
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_sqlite.rb', line 41

def execute( sql, var = [] )
  get_handle().execute( sql, var )
  ret = { :cmdtuples=>handle.changes(),
          :insert_id=>handle.last_insert_row_id() }
  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_sqlite.rb', line 143

def insert( table, values )
  col = ""
  plh = ""
  val = []
  values.each do |k,v|
    col << "#{k},"
    plh << "?,"
    case v
    when Array
      val << v.join( ',' )
    when String, Integer, NilClass
      val << v
    when Time
      val << v.strftime("%Y-%m-%d %H:%M:%S")
    else
      val << v.to_s
    end
  end
  col.chop!
  plh.chop!

  sql = "insert into #{table} (#{col}) values (#{plh});"
  handle = get_handle()
  handle.execute( sql, val )

  return { :cmdtuples=>handle.changes(), :insert_id=>handle.last_insert_row_id() }
end

#open_connection ⇒ Object

RDBとのコネクションを開始する



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

def open_connection()
  return false  if ! @dsn

  @handle = SQLite3::Database.new( @dsn )
  @handle.busy_timeout( 30000 )
  @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_sqlite.rb', line 253

def rollback()
  return false  if ! @flag_transaction
  get_handle().execute( "rollback transaction;" )
  @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_sqlite.rb', line 64

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

  when Array
    @result = get_handle().prepare( sql ).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 )
    @result = get_handle().prepare( "#{s[0]} where #{where} #{s[1]}" ).execute( val )

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

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

  # get field name
  @fields = @result.columns.map {|field| field.to_sym }

  return select_next()  if @select_fetch_mode == :ROW

  # get data all
  ret = []
  case @select_data_type
  when :ARRAY         # Array<Array>で返す
    @result.each {|row| ret << row }

  else                # Array<Hash>で返す（標準）
    @result.each {|row| ret << [@fields, row].transpose.to_h }
  end
  @result.close()

  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

Examples:

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_sqlite.rb', line 118

def select_next()
  return nil  if @result.closed?
  row = @result.next()
  if !row
    @result.close()
    return nil
  end

  case @select_data_type
  when :ARRAY
    return row

  else
    return [@fields, row].transpose.to_h
  end
end

#table(tname, pkey = nil) ⇒ AlPersistSqlite

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_sqlite.rb', line 43

def table( tname, pkey = nil )
  return AlPersistSqlite.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_sqlite.rb', line 226

def transaction()
  return false  if @flag_transaction
  get_handle().execute( "begin transaction;" )
  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_sqlite.rb', line 180

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

  (where, wval) = make_where_condition( where_cond )

  sql = "update #{table} set #{columns} where #{where};"
  get_handle().execute( sql, val + wval )

  return { :cmdtuples=>handle.changes() }
end