Class: ActiveRecord::ConnectionAdapters::OracleEnhancedJDBCConnection

Inherits:
OracleEnhancedConnection show all
Defined in:
lib/active_record/connection_adapters/oracle_enhanced_jdbc_connection.rb

Overview

JDBC database interface for JRuby

Instance Attribute Summary collapse

Attributes inherited from OracleEnhancedConnection

#raw_connection

Instance Method Summary collapse

Methods inherited from OracleEnhancedConnection

create, #oracle_downcase

Constructor Details

#initialize(config) ⇒ OracleEnhancedJDBCConnection

Returns a new instance of OracleEnhancedJDBCConnection.



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# File 'lib/active_record/connection_adapters/oracle_enhanced_jdbc_connection.rb', line 44

def initialize(config)
  @active = true
  @config = config
  new_connection(@config)
end

Instance Attribute Details

#active ⇒ Object Also known as: active?

Returns the value of attribute active.



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# File 'lib/active_record/connection_adapters/oracle_enhanced_jdbc_connection.rb', line 37

def active
  @active
end

#auto_retry ⇒ Object Also known as: auto_retry?

Returns the value of attribute auto_retry.



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# File 'lib/active_record/connection_adapters/oracle_enhanced_jdbc_connection.rb', line 40

def auto_retry
  @auto_retry
end

Instance Method Details

#autocommit=(value) ⇒ Object 



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# File 'lib/active_record/connection_adapters/oracle_enhanced_jdbc_connection.rb', line 102

def autocommit=(value)
  @raw_connection.setAutoCommit(value)
end

#autocommit? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/oracle_enhanced_jdbc_connection.rb', line 98

def autocommit?
  @raw_connection.getAutoCommit
end

#commit ⇒ Object 



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# File 'lib/active_record/connection_adapters/oracle_enhanced_jdbc_connection.rb', line 90

def commit
  @raw_connection.commit
end

#describe(name) ⇒ Object 



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# File 'lib/active_record/connection_adapters/oracle_enhanced_jdbc_connection.rb', line 244

def describe(name)
  real_name = OracleEnhancedAdapter.valid_table_name?(name) ? name.to_s.upcase : name.to_s
  if real_name.include?('.')
    table_owner, table_name = real_name.split('.')
  else
    table_owner, table_name = @owner, real_name
  end
  sql = <<-SQL
    SELECT owner, table_name, 'TABLE' name_type
    FROM all_tables
    WHERE owner = '#{table_owner}'
      AND table_name = '#{table_name}'
    UNION ALL
    SELECT owner, view_name table_name, 'VIEW' name_type
    FROM all_views
    WHERE owner = '#{table_owner}'
      AND view_name = '#{table_name}'
    UNION ALL
    SELECT table_owner, table_name, 'SYNONYM' name_type
    FROM all_synonyms
    WHERE owner = '#{table_owner}'
      AND synonym_name = '#{table_name}'
    UNION ALL
    SELECT table_owner, table_name, 'SYNONYM' name_type
    FROM all_synonyms
    WHERE owner = 'PUBLIC'
      AND synonym_name = '#{real_name}'
  SQL
  if result = select_one(sql)
    case result['name_type']
    when 'SYNONYM'
      describe("#{result['owner']}.#{result['table_name']}")
    else
      [result['owner'], result['table_name']]
    end
  else
    raise OracleEnhancedConnectionException, %Q{"DESC #{name}" failed; does it exist?}
  end
end

#exec(sql) ⇒ Object 



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# File 'lib/active_record/connection_adapters/oracle_enhanced_jdbc_connection.rb', line 152

def exec(sql)
  with_retry do
    exec_no_retry(sql)
  end
end

#exec_no_retry(sql) ⇒ Object 



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# File 'lib/active_record/connection_adapters/oracle_enhanced_jdbc_connection.rb', line 158

def exec_no_retry(sql)
  cs = prepare_call(sql)
  case sql
  when /\A\s*UPDATE/i, /\A\s*INSERT/i, /\A\s*DELETE/i
    cs.executeUpdate
  else
    cs.execute
    true
  end
ensure
  cs.close rescue nil        
end

#logoff ⇒ Object 



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# File 'lib/active_record/connection_adapters/oracle_enhanced_jdbc_connection.rb', line 82

def logoff
  @active = false
  @raw_connection.close
  true
rescue
  false
end

#new_connection(config) ⇒ Object 



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# File 'lib/active_record/connection_adapters/oracle_enhanced_jdbc_connection.rb', line 50

def new_connection(config)
  username, password, database = config[:username].to_s, config[:password].to_s, config[:database].to_s
  privilege = config[:privilege] && config[:privilege].to_s
  host, port = config[:host], config[:port]

  url = config[:url] || "jdbc:oracle:thin:@#{host || 'localhost'}:#{port || 1521}:#{database || 'XE'}"

  prefetch_rows = config[:prefetch_rows] || 100
  cursor_sharing = config[:cursor_sharing] || 'similar'

  properties = java.util.Properties.new
  properties.put("user", username)
  properties.put("password", password)
  properties.put("defaultRowPrefetch", "#{prefetch_rows}") if prefetch_rows
  properties.put("internal_logon", privilege) if privilege

  @raw_connection = java.sql.DriverManager.getConnection(url, properties)
  exec %q{alter session set nls_date_format = 'YYYY-MM-DD HH24:MI:SS'}
  exec %q{alter session set nls_timestamp_format = 'YYYY-MM-DD HH24:MI:SS'} # rescue nil
  exec "alter session set cursor_sharing = #{cursor_sharing}" # rescue nil
  self.autocommit = true
  
  # Set session time zone to current time zone
  @raw_connection.setSessionTimeZone(java.util.TimeZone.default.getID)
  
  # default schema owner
  @owner = username.upcase
  
  @raw_connection
end

#ping ⇒ Object

Checks connection, returns true if active. Note that ping actively checks the connection, while #active? simply returns the last known state.



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# File 'lib/active_record/connection_adapters/oracle_enhanced_jdbc_connection.rb', line 109

def ping
  exec_no_retry("select 1 from dual")
  @active = true
rescue NativeException => e
  @active = false
  if e.message =~ /^java\.sql\.SQLException/
    raise OracleEnhancedConnectionException, e.message
  else
    raise
  end
end

#reset! ⇒ Object

Resets connection, by logging off and creating a new connection.



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# File 'lib/active_record/connection_adapters/oracle_enhanced_jdbc_connection.rb', line 122

def reset!
  logoff rescue nil
  begin
    new_connection(@config)
    @active = true
  rescue NativeException => e
    @active = false
    if e.message =~ /^java\.sql\.SQLException/
      raise OracleEnhancedConnectionException, e.message
    else
      raise
    end
  end
end

#rollback ⇒ Object 



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# File 'lib/active_record/connection_adapters/oracle_enhanced_jdbc_connection.rb', line 94

def rollback
  @raw_connection.rollback
end

#select(sql, name = nil, return_column_names = false) ⇒ Object 



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# File 'lib/active_record/connection_adapters/oracle_enhanced_jdbc_connection.rb', line 171

def select(sql, name = nil, return_column_names = false)
  with_retry do
    select_no_retry(sql, name, return_column_names)
  end        
end

#select_no_retry(sql, name = nil, return_column_names = false) ⇒ Object 



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# File 'lib/active_record/connection_adapters/oracle_enhanced_jdbc_connection.rb', line 177

def select_no_retry(sql, name = nil, return_column_names = false)
  stmt = prepare_statement(sql)
  rset = stmt.executeQuery
  metadata = rset.getMetaData
  column_count = metadata.getColumnCount
  cols = (1..column_count).map do |i|
    oracle_downcase(metadata.getColumnName(i))
  end
  col_types = (1..column_count).map do |i|
    metadata.getColumnTypeName(i)
  end

  rows = []

  while rset.next
    hash = Hash.new

    cols.each_with_index do |col, i0|
      i = i0 + 1
      hash[col] = 
        case column_type = col_types[i0]
        when /CLOB/
          name == 'Writable Large Object' ? rset.getClob(i) : get_ruby_value_from_result_set(rset, i, column_type)
        when /BLOB/
          name == 'Writable Large Object' ? rset.getBlob(i) : get_ruby_value_from_result_set(rset, i, column_type)
        when 'DATE'
          t = get_ruby_value_from_result_set(rset, i, column_type)
          # RSI: added emulate_dates_by_column_name functionality
          # if emulate_dates_by_column_name && self.class.is_date_column?(col)
          #   d.to_date
          # elsif
          if t && OracleEnhancedAdapter.emulate_dates && (t.hour == 0 && t.min == 0 && t.sec == 0)
            t.to_date
          else
            # JRuby Time supports time before year 1900 therefore now need to fall back to DateTime
            t
          end
        # RSI: added emulate_integers_by_column_name functionality
        when "NUMBER"
          n = get_ruby_value_from_result_set(rset, i, column_type)
          if n && n.is_a?(Float) && OracleEnhancedAdapter.emulate_integers_by_column_name && OracleEnhancedAdapter.is_integer_column?(col)
            n.to_i
          else
            n
          end
        else
          get_ruby_value_from_result_set(rset, i, column_type)
        end unless col == 'raw_rnum_'
    end

    rows << hash
  end

  return_column_names ? [rows, cols] : rows
ensure
  rset.close rescue nil
  stmt.close rescue nil
end

#with_retry(&block) ⇒ Object

mark connection as dead if connection lost



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# File 'lib/active_record/connection_adapters/oracle_enhanced_jdbc_connection.rb', line 138

def with_retry(&block)
  should_retry = auto_retry? && autocommit?
  begin
    yield if block_given?
  rescue NativeException => e
    raise unless e.message =~ /^java\.sql\.SQLException: (Closed Connection|Io exception:|No more data to read from socket)/
    @active = false
    raise unless should_retry
    should_retry = false
    reset! rescue nil
    retry
  end
end

#write_lob(lob, value, is_binary = false) ⇒ Object 



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# File 'lib/active_record/connection_adapters/oracle_enhanced_jdbc_connection.rb', line 236

def write_lob(lob, value, is_binary = false)
  if is_binary
    lob.setBytes(1, value.to_java_bytes)
  else
    lob.setString(1,value)
  end
end