Class: ActiveRecord::ConnectionAdapters::FrontBaseAdapter

Inherits:
AbstractAdapter
  • Object
show all
Defined in:
lib/active_record/connection_adapters/frontbase_adapter.rb

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from AbstractAdapter

#raw_connection, #requires_reloading?, #reset_runtime, #supports_count_distinct?, #verify!

Methods included from Quoting

#quoted_date

Methods included from SchemaStatements

#add_index, #add_order_by_for_association_limiting!, #distinct, #dump_schema_information, #index_name, #initialize_schema_information, #table_alias_for, #table_alias_length, #type_to_sql

Constructor Details

#initialize(connection, logger, connection_options, config) ⇒ FrontBaseAdapter

Returns a new instance of FrontBaseAdapter.



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# File 'lib/active_record/connection_adapters/frontbase_adapter.rb', line 248

def initialize(connection, logger, connection_options, config)
  super(connection, logger)
  @connection_options, @config = connection_options, config
  @transaction_mode = :pessimistic
  
  # Start out in auto-commit mode
  self.rollback_db_transaction
  
  # threaded_connections_test.rb will fail unless we set the session
  # to optimistic locking mode
#         set_pessimistic_transactions
#         execute "SET TRANSACTION ISOLATION LEVEL REPEATABLE READ, READ WRITE, LOCKING OPTIMISTIC"
end

Class Method Details

.compare_versions(v1, v2) ⇒ Object 



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# File 'lib/active_record/connection_adapters/frontbase_adapter.rb', line 237

def compare_versions(v1, v2)
  v1_seg  = v1.split(".")
  v2_seg  = v2.split(".")
  0.upto([v1_seg.length,v2_seg.length].min) do |i|
    step  = (v1_seg[i].to_i <=> v2_seg[i].to_i)
    return step unless step == 0
  end
  return v1_seg.length <=> v2_seg.length
end

Instance Method Details

#active? ⇒ Boolean

CONNECTION MANAGEMENT ====================================

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/frontbase_adapter.rb', line 432

def active?
  true if @connection.status == 1
rescue => e
  false
end

#adapter_name ⇒ Object

Returns the human-readable name of the adapter. Use mixed case - one can always use downcase if needed.



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# File 'lib/active_record/connection_adapters/frontbase_adapter.rb', line 264

def adapter_name #:nodoc:
  'FrontBase'
end

#add_column(table_name, column_name, type, options = {}) ⇒ Object

Adds a new column to the named table. See TableDefinition#column for details of the options you can use.



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# File 'lib/active_record/connection_adapters/frontbase_adapter.rb', line 789

def add_column(table_name, column_name, type, options = {})
  add_column_sql = "ALTER TABLE #{table_name} ADD #{column_name} #{type_to_sql(type, options[:limit])}"
  options[:type] = type
  add_column_options!(add_column_sql, options)
  execute(add_column_sql)
end

#add_column_options!(sql, options) ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/frontbase_adapter.rb', line 796

def add_column_options!(sql, options) #:nodoc:
  default_value = quote(options[:default], options[:column])
  if options_include_default?(options)
    if options[:type] == :boolean
      default_value = options[:default] == 0 ? quoted_false : quoted_true
    end
    sql << " DEFAULT #{default_value}"
  end
  sql << " NOT NULL" if options[:null] == false
end

#add_limit_offset!(sql, options) ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/frontbase_adapter.rb', line 567

def add_limit_offset!(sql, options) #:nodoc:
  if limit = options[:limit]
    offset = options[:offset] || 0
  
# Here is the full syntax FrontBase supports:
# (from [email protected])
# 
#       TOP <limit - unsigned integer>
#       TOP ( <offset expr>, <limit expr>)
  
    # "TOP 0" is not allowed, so we have
    # to use a cheap trick.
    if limit.zero?
      case sql
      when /WHERE/i
        sql.sub!(/WHERE/i, 'WHERE 0 = 1 AND ')
      when /ORDER\s+BY/i
        sql.sub!(/ORDER\s+BY/i, 'WHERE 0 = 1 ORDER BY')
      else
        sql << 'WHERE 0 = 1'
      end
    else
      if offset.zero?
        sql.replace sql.gsub("SELECT ","SELECT TOP #{limit} ")
      else
        sql.replace sql.gsub("SELECT ","SELECT TOP(#{offset},#{limit}) ")
      end
    end
  end
end

#begin_db_transaction ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/frontbase_adapter.rb', line 551

def begin_db_transaction #:nodoc:
  execute "SET COMMIT FALSE" rescue nil
end

#change_column(table_name, column_name, type, options = {}) ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/frontbase_adapter.rb', line 826

def change_column(table_name, column_name, type, options = {}) #:nodoc:
  change_column_sql = %( ALTER COLUMN "#{table_name}"."#{column_name}" TO #{type_to_sql(type, options[:limit])} )
  execute(change_column_sql)
  change_column_sql = %( ALTER TABLE "#{table_name}" ALTER COLUMN "#{column_name}" )

  if options_include_default?(options)
    default_value = quote(options[:default], options[:column])
    if type == :boolean
      default_value = options[:default] == 0 ? quoted_false : quoted_true
    end
    change_column_sql << " SET DEFAULT #{default_value}"
  end

  execute(change_column_sql)
  
#         change_column_sql = "ALTER TABLE #{table_name} CHANGE #{column_name} #{column_name} #{type_to_sql(type, options[:limit])}"
#         add_column_options!(change_column_sql, options)
#         execute(change_column_sql)
end

#change_column_default(table_name, column_name, default) ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/frontbase_adapter.rb', line 822

def change_column_default(table_name, column_name, default) #:nodoc:
  execute "ALTER TABLE #{table_name} ALTER COLUMN #{column_name} SET DEFAULT #{default}" if default != "NULL"
end

#classes_for_table_name(table) ⇒ Object 



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# File 'lib/active_record/connection_adapters/frontbase_adapter.rb', line 625

def classes_for_table_name(table)
  ActiveRecord::Base.send(:subclasses).select {|klass| klass.table_name == table}
end

#columns(table_name, name = nil) ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/frontbase_adapter.rb', line 713

def columns(table_name, name = nil)#:nodoc:
  sql = <<-SQL
    SELECT   "TABLE_NAME", "COLUMN_NAME", ORDINAL_POSITION, IS_NULLABLE, COLUMN_DEFAULT, 
             DATA_TYPE, DATA_TYPE_CODE, CHARACTER_MAXIMUM_LENGTH, NUMERIC_PRECISION, 
             NUMERIC_PRECISION_RADIX, NUMERIC_SCALE, DATETIME_PRECISION, DATETIME_PRECISION_LEADING 
    FROM     INFORMATION_SCHEMA.TABLES               T0, 
             INFORMATION_SCHEMA.COLUMNS              T1, 
             INFORMATION_SCHEMA.DATA_TYPE_DESCRIPTOR T3 
    WHERE    "TABLE_NAME" = '#{table_name}' 
      AND    T0.TABLE_PK  = T1.TABLE_PK 
      AND    T0.TABLE_PK  = T3.TABLE_OR_DOMAIN_PK 
      AND    T1.COLUMN_PK = T3.COLUMN_NAME_PK 
    ORDER BY T1.ORDINAL_POSITION
  SQL

  rawresults = query(sql,name)
  columns = []
  rawresults.each do |field|
    args = [base       = field[0],
            name       = field[1],
            typecode   = field[6],
            typestring = field[5],
            limit      = field[7],
            precision  = field[8],
            scale      = field[9],
            default    = field[4],
            nullable   = field[3]]
    columns << FrontBaseColumn.new(*args)
   end
  columns
end

#commit_db_transaction ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/frontbase_adapter.rb', line 555

def commit_db_transaction #:nodoc:
  execute "COMMIT"
ensure
  execute "SET COMMIT TRUE"
end

#create_database(name) ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/frontbase_adapter.rb', line 652

def create_database(name) #:nodoc:
  execute "CREATE DATABASE #{name}"
end

#create_table(name, options = {}) ⇒ Object 



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# File 'lib/active_record/connection_adapters/frontbase_adapter.rb', line 745

def create_table(name, options = {})
  table_definition = TableDefinition.new(self)
  table_definition.primary_key(options[:primary_key] || "id") unless options[:id] == false

  yield table_definition

  if options[:force]
    drop_table(name) rescue nil
  end

  create_sql = "CREATE#{' TEMPORARY' if options[:temporary]} TABLE "
  create_sql << "#{name} ("
  create_sql << table_definition.to_sql
  create_sql << ") #{options[:options]}"
  begin_db_transaction
  execute create_sql
  commit_db_transaction
  rescue ActiveRecord::StatementInvalid => e
    raise e unless e.message.match(/Table name - \w* - exists/)
end

#current_database ⇒ Object 



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# File 'lib/active_record/connection_adapters/frontbase_adapter.rb', line 660

def current_database
  select_value('SELECT "CATALOG_NAME" FROM INFORMATION_SCHEMA.CATALOGS').downcase
end

#default_sequence_name(table, column) ⇒ Object 



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# File 'lib/active_record/connection_adapters/frontbase_adapter.rb', line 611

def default_sequence_name(table, column)
  table
end

#disconnect! ⇒ Object

Close this connection



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# File 'lib/active_record/connection_adapters/frontbase_adapter.rb', line 444

def disconnect!
  @connection.close rescue nil
  @active = false
end

#drop_database(name) ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/frontbase_adapter.rb', line 656

def drop_database(name) #:nodoc:
  execute "DROP DATABASE #{name}"
end

#drop_table(name, options = {}) ⇒ Object

Drops a table from the database.



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# File 'lib/active_record/connection_adapters/frontbase_adapter.rb', line 781

def drop_table(name, options = {})
  execute "DROP TABLE #{name} RESTRICT"
rescue ActiveRecord::StatementInvalid => e
  raise e unless e.message.match(/Referenced TABLE - \w* - does not exist/)
end

#execute(sql, name = nil) ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/frontbase_adapter.rb', line 511

def execute(sql, name = nil) #:nodoc:
  fbsql = cleanup_fb_sql(sql)
  puts "SQL(execute) -> #{fbsql}"  if FB_TRACE
  log(fbsql, name) { @connection.query(fbsql) }
rescue ActiveRecord::StatementInvalid => e
  if e.message.scan(/Table name - \w* - exists/).empty?
    puts "FB Exception: #{e.inspect}" if FB_TRACE
    raise e
  end
end

#indexes(table_name, name = nil) ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/frontbase_adapter.rb', line 674

def indexes(table_name, name = nil)#:nodoc:
  indexes = []
  current_index = nil
  sql = <<-SQL
    SELECT   INDEX_NAME, T2.ORDINAL_POSITION, INDEX_COLUMN_COUNT, INDEX_TYPE, 
             "COLUMN_NAME", IS_NULLABLE 
    FROM     INFORMATION_SCHEMA.TABLES             AS T0, 
             INFORMATION_SCHEMA.INDEXES            AS T1, 
             INFORMATION_SCHEMA.INDEX_COLUMN_USAGE AS T2, 
             INFORMATION_SCHEMA.COLUMNS            AS T3 
    WHERE    T0."TABLE_NAME" = '#{table_name}' 
      AND    INDEX_TYPE <> 0 
      AND    T0.TABLE_PK   = T1.TABLE_PK 
      AND    T0.TABLE_PK   = T2.TABLE_PK 
      AND    T0.TABLE_PK   = T3.TABLE_PK 
      AND    T1.INDEXES_PK = T2.INDEX_PK 
      AND    T2.COLUMN_PK  = T3.COLUMN_PK 
    ORDER BY INDEX_NAME, T2.ORDINAL_POSITION
  SQL

  columns = []
  query(sql).each do |row|
    index_name   = row[0]
    ord_position = row[1]
    ndx_colcount = row[2]
    index_type   = row[3]
    column_name  = row[4]
    
    is_unique = index_type == 1
    
    columns << column_name
    if ord_position == ndx_colcount
      indexes << IndexDefinition.new(table_name, index_name, is_unique , columns)
      columns = []
    end
  end
  indexes
end

#insert(sql, name = nil, pk = nil, id_value = nil, sequence_name = nil) ⇒ Object

Returns the last auto-generated ID from the affected table.



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# File 'lib/active_record/connection_adapters/frontbase_adapter.rb', line 523

def insert(sql, name = nil, pk = nil, id_value = nil, sequence_name = nil) #:nodoc:
  puts "SQL -> #{sql.inspect}"  if FB_TRACE
  execute(sql, name)
  id_value || pk
end

#native_database_types ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/frontbase_adapter.rb', line 274

def native_database_types #:nodoc:
  {
    :primary_key    => "INTEGER DEFAULT UNIQUE PRIMARY KEY",
    :string         => { :name => "VARCHAR", :limit => 255 },
    :text           => { :name => "CLOB" },
    :integer        => { :name => "INTEGER" },
    :float          => { :name => "FLOAT" },
    :decimal        => { :name => "DECIMAL" },
    :datetime       => { :name => "TIMESTAMP" },
    :timestamp      => { :name => "TIMESTAMP" },
    :time           => { :name => "TIME" },
    :date           => { :name => "DATE" },
    :binary         => { :name => "BLOB" },
    :boolean        => { :name => "BOOLEAN" },
    :twelvebytekey  => { :name => "BYTE", :limit => 12}
  }
end

#next_sequence_value(sequence_name) ⇒ Object

Returns the next sequence value from a sequence generator. Not generally called directly; used by ActiveRecord to get the next primary key value when inserting a new database record (see #prefetch_primary_key?).



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# File 'lib/active_record/connection_adapters/frontbase_adapter.rb', line 605

def next_sequence_value(sequence_name)
  unique = select_value("SELECT UNIQUE FROM #{sequence_name}","Next Sequence Value")
  # The test cases cannot handle a zero primary key
  unique.zero? ? select_value("SELECT UNIQUE FROM #{sequence_name}","Next Sequence Value") : unique
end

#prefetch_primary_key?(table_name = nil) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/frontbase_adapter.rb', line 598

def prefetch_primary_key?(table_name = nil)
  true
end

#query(sql, name = nil) ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/frontbase_adapter.rb', line 502

def query(sql, name = nil) #:nodoc:
  fbsql = cleanup_fb_sql(sql)
  puts "SQL(query) -> #{fbsql}"  if FB_TRACE
  log(fbsql, name) { @connection.query(fbsql) }
rescue => e
  puts "FB Exception: #{e.inspect}" if FB_TRACE
  raise e
end

#quote(value, column = nil) ⇒ Object

Quotes the column value to help prevent SQL injection attacks.



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# File 'lib/active_record/connection_adapters/frontbase_adapter.rb', line 297

def quote(value, column = nil)
  return value.quoted_id if value.respond_to?(:quoted_id)

  retvalue = "<INVALID>"

  puts "quote(#{value.inspect}(#{value.class}),#{column.type.inspect})" if FB_TRACE
  # If a column was passed in, use column type information
  unless value.nil?
    if column
      retvalue = case column.type
        when :string
          if value.kind_of?(String)
            "'#{quote_string(value.to_s)}'" # ' (for ruby-mode)
          else
            "'#{quote_string(value.to_yaml)}'"
          end
        when :integer
          if value.kind_of?(TrueClass)
            '1'
          elsif value.kind_of?(FalseClass)
            '0'
          else
             value.to_i.to_s
          end
        when :float
          value.to_f.to_s
        when :decimal
          value.to_d.to_s("F")
        when :datetime, :timestamp
          "TIMESTAMP '#{value.strftime("%Y-%m-%d %H:%M:%S")}'"
        when :time
          "TIME '#{value.strftime("%H:%M:%S")}'"
        when :date
          "DATE '#{value.strftime("%Y-%m-%d")}'"
        when :twelvebytekey
          value = value.to_s.unpack("H*").first unless value.kind_of?(TwelveByteKey)
          "X'#{value.to_s}'"
        when :boolean
          value = quoted_true if value.kind_of?(TrueClass)
          value = quoted_false if value.kind_of?(FalseClass)
          value
        when :binary
          blob_handle = @connection.create_blob(value.to_s)
          puts "SQL -> Insert #{value.to_s.length} byte blob as #{retvalue}" if FB_TRACE
          blob_handle.handle
        when :text
          if value.kind_of?(String)
            clobdata = value.to_s # ' (for ruby-mode)
          else
            clobdata = value.to_yaml
          end
          clob_handle = @connection.create_clob(clobdata)
          puts "SQL -> Insert #{value.to_s.length} byte clob as #{retvalue}" if FB_TRACE
          clob_handle.handle
        else
          raise "*** UNKNOWN TYPE: #{column.type.inspect}"
      end # case
    # Since we don't have column type info, make a best guess based
    # on the Ruby class of the value
    else
      retvalue = case value
        when ActiveRecord::ConnectionAdapters::TwelveByteKey
          s = value.unpack("H*").first
          "X'#{s}'"
        when String
          if column && column.type == :binary
            s = value.unpack("H*").first
            "X'#{s}'"
          elsif column && [:integer, :float, :decimal].include?(column.type) 
            value.to_s
          else
            "'#{quote_string(value)}'" # ' (for ruby-mode)
          end
        when NilClass
          "NULL"
        when TrueClass
          (column && column.type == :integer ? '1' : quoted_true)
        when FalseClass
          (column && column.type == :integer ? '0' : quoted_false)
        when Float, Fixnum, Bignum, BigDecimal
          value.to_s
        when Time, Date, DateTime
          if column
            case column.type
              when :date
                "DATE '#{value.strftime("%Y-%m-%d")}'"
              when :time
                "TIME '#{value.strftime("%H:%M:%S")}'"
              when :timestamp
                "TIMESTAMP '#{value.strftime("%Y-%m-%d %H:%M:%S")}'"
            else
              raise NotImplementedError, "Unknown column type!"
            end # case
          else # Column wasn't passed in, so try to guess the right type
            if value.kind_of? Date
              "DATE '#{value.strftime("%Y-%m-%d")}'"
            else
              if [:hour, :min, :sec].all? {|part| value.send(:part).zero? }
                "TIME '#{value.strftime("%H:%M:%S")}'"
              else
                "TIMESTAMP '#{quoted_date(value)}'"
              end
            end 
          end #if column
        else 
          "'#{quote_string(value.to_yaml)}'"
      end #case
    end
  else
    retvalue = "NULL"
  end
   
  retvalue
end

#quote_column_name(name) ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/frontbase_adapter.rb', line 417

def quote_column_name(name) #:nodoc:
  %( "#{name}" )
end

#quote_string(s) ⇒ Object

Quotes a string, escaping any ‘ (single quote) characters.



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# File 'lib/active_record/connection_adapters/frontbase_adapter.rb', line 413

def quote_string(s)
  s.gsub(/'/, "''") # ' (for ruby-mode)
end

#quoted_false ⇒ Object 



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# File 'lib/active_record/connection_adapters/frontbase_adapter.rb', line 425

def quoted_false
  "false"
end

#quoted_true ⇒ Object 



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# File 'lib/active_record/connection_adapters/frontbase_adapter.rb', line 421

def quoted_true
  "true"
end

#reconnect! ⇒ Object 



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# File 'lib/active_record/connection_adapters/frontbase_adapter.rb', line 438

def reconnect!
  @connection.close rescue nil
  @connection = FBSQL_Connect.connect(*@connection_options.first(7))
end

#recreate_database(name) ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/frontbase_adapter.rb', line 647

def recreate_database(name) #:nodoc:
  drop_database(name)
  create_database(name)
end

#remove_column(table_name, column_name) ⇒ Object

Removes the column from the table definition.

Examples
remove_column(:suppliers, :qualification)



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# File 'lib/active_record/connection_adapters/frontbase_adapter.rb', line 810

def remove_column(table_name, column_name)
  execute "ALTER TABLE #{table_name} DROP #{column_name} RESTRICT"
end

#remove_index(table_name, options = {}) ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/frontbase_adapter.rb', line 814

def remove_index(table_name, options = {}) #:nodoc:
  if options[:unique]
    execute "ALTER TABLE #{table_name} DROP CONSTRAINT #{quote_column_name(index_name(table_name, options))} RESTRICT"
  else
    execute "DROP INDEX #{quote_column_name(index_name(table_name, options))}"
  end
end

#rename_column(table_name, column_name, new_column_name) ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/frontbase_adapter.rb', line 846

def rename_column(table_name, column_name, new_column_name) #:nodoc:
  execute %( ALTER COLUMN NAME "#{table_name}"."#{column_name}" TO "#{new_column_name}" )
end

#rename_table(name, new_name) ⇒ Object 



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# File 'lib/active_record/connection_adapters/frontbase_adapter.rb', line 766

def rename_table(name, new_name)
  columns = columns(name)
  pkcol = columns.find {|c| c.fb_autogen}
  execute "ALTER TABLE NAME #{name} TO #{new_name}"
  if pkcol
    change_column_default(new_name,pkcol.name,"UNIQUE")
    begin_db_transaction
    mpk = select_value("SELECT MAX(#{pkcol.name}) FROM #{new_name}")
    mpk = 0 if mpk.nil?
    execute "SET UNIQUE=#{mpk} FOR #{new_name}"
    commit_db_transaction
  end
end

#reset_pk_sequence!(table, pk = nil, sequence = nil) ⇒ Object 



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# File 'lib/active_record/connection_adapters/frontbase_adapter.rb', line 629

def reset_pk_sequence!(table, pk = nil, sequence = nil)
  klasses = classes_for_table_name(table)
  klass   = klasses.nil? ? nil : klasses.first
  pk      = klass.primary_key unless klass.nil?
  if pk && klass.columns_hash[pk].type == :integer
    mpk = select_value("SELECT MAX(#{pk}) FROM #{table}")
    execute("SET UNIQUE FOR #{klass.table_name}(#{pk})")
  end
end

#reset_sequence!(table, column, sequence = nil) ⇒ Object

Set the sequence to the max value of the table’s column.



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# File 'lib/active_record/connection_adapters/frontbase_adapter.rb', line 616

def reset_sequence!(table, column, sequence = nil)
  klasses = classes_for_table_name(table)
  klass   = klasses.nil? ? nil : klasses.first
  pk      = klass.primary_key unless klass.nil?
  if pk && klass.columns_hash[pk].type == :integer
    execute("SET UNIQUE FOR #{klass.table_name}(#{pk})")
  end
end

#rollback_db_transaction ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/frontbase_adapter.rb', line 561

def rollback_db_transaction #:nodoc:
  execute "ROLLBACK"
ensure
  execute "SET COMMIT TRUE"
end

#select_all(sql, name = nil) ⇒ Object

Returns an array of record hashes with the column names as keys and column values as values.



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# File 'lib/active_record/connection_adapters/frontbase_adapter.rb', line 453

def select_all(sql, name = nil) #:nodoc:
  fbsql        = cleanup_fb_sql(sql)
  return_value = []
  fbresult     = execute(sql, name)
  puts "select_all SQL -> #{fbsql}" if FB_TRACE
  columns = fbresult.columns

  fbresult.each do |row|
    puts "SQL <- #{row.inspect}"  if FB_TRACE
    hashed_row = {}    
    colnum     = 0
    row.each do |col|
      hashed_row[columns[colnum]] = col
      if col.kind_of?(FBSQL_LOB)
        hashed_row[columns[colnum]] = col.read
      end
      colnum += 1
    end
    puts "raw row: #{hashed_row.inspect}" if FB_TRACE
    return_value << hashed_row
  end
  return_value
end

#select_one(sql, name = nil) ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/frontbase_adapter.rb', line 477

def select_one(sql, name = nil) #:nodoc:
  fbsql        = cleanup_fb_sql(sql)
  return_value = []
  fbresult     = execute(fbsql, name)
  puts "SQL -> #{fbsql}"  if FB_TRACE
  columns = fbresult.columns
  
  fbresult.each do |row|
    puts "SQL <- #{row.inspect}"  if FB_TRACE
    hashed_row = {}    
    colnum     = 0
    row.each do |col|
      hashed_row[columns[colnum]] = col
      if col.kind_of?(FBSQL_LOB)
        hashed_row[columns[colnum]] = col.read
      end
      colnum += 1
    end
    return_value << hashed_row
    break
  end
  fbresult.clear
  return_value.first
end

#set_optimistic_transactions ⇒ Object 



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# File 'lib/active_record/connection_adapters/frontbase_adapter.rb', line 544

def set_optimistic_transactions
  if @transaction_mode == :pessimistic
    execute "SET TRANSACTION ISOLATION LEVEL REPEATABLE READ, READ WRITE, LOCKING OPTIMISTIC"
    @transaction_mode = :optimistic
  end
end

#set_pessimistic_transactions ⇒ Object 



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# File 'lib/active_record/connection_adapters/frontbase_adapter.rb', line 537

def set_pessimistic_transactions
  if @transaction_mode == :optimistic
    execute "SET TRANSACTION ISOLATION LEVEL SERIALIZABLE, LOCKING PESSIMISTIC, READ WRITE"
    @transaction_mode = :pessimistic
  end
end

#structure_dump ⇒ Object

SCHEMA STATEMENTS ========================================



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# File 'lib/active_record/connection_adapters/frontbase_adapter.rb', line 641

def structure_dump #:nodoc:
  select_all("SHOW TABLES").inject('') do |structure, table|
    structure << select_one("SHOW CREATE TABLE #{table.to_a.first.last}")["Create Table"] << ";\n\n"
  end
end

#supports_migrations? ⇒ Boolean

Does this adapter support migrations? Backend specific, as the abstract adapter always returns false.

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/frontbase_adapter.rb', line 270

def supports_migrations? #:nodoc:
  true
end

#tables(name = nil) ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/frontbase_adapter.rb', line 664

def tables(name = nil) #:nodoc:
  select_values(<<-SQL, nil)
    SELECT "TABLE_NAME" 
    FROM   INFORMATION_SCHEMA.TABLES   AS T0,
           INFORMATION_SCHEMA.SCHEMATA AS T1 
    WHERE  T0.SCHEMA_PK  = T1.SCHEMA_PK 
    AND    "SCHEMA_NAME" = CURRENT_SCHEMA
  SQL
end

#update(sql, name = nil) ⇒ Object Also known as: delete

Executes the update statement and returns the number of rows affected.



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# File 'lib/active_record/connection_adapters/frontbase_adapter.rb', line 530

def update(sql, name = nil) #:nodoc:
  puts "SQL -> #{sql.inspect}"  if FB_TRACE
  execute(sql, name).num_rows
end