Class: ActiveRecord::ConnectionAdapters::OracleEnhanced::JDBCConnection

Inherits:
Connection
  • Object
show all
Defined in:
lib/active_record/connection_adapters/oracle_enhanced/jdbc_connection.rb

Overview

:nodoc:

Defined Under Namespace

Classes: Cursor

Instance Attribute Summary collapse

Attributes inherited from Connection

#raw_connection

Instance Method Summary collapse

Methods inherited from Connection

create

Constructor Details

#initialize(config) ⇒ JDBCConnection

Returns a new instance of JDBCConnection.



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# File 'lib/active_record/connection_adapters/oracle_enhanced/jdbc_connection.rb', line 63

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 56

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 59

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 217

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 213

def autocommit?
  @raw_connection.getAutoCommit
end

#commit ⇒ Object 



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# File 'lib/active_record/connection_adapters/oracle_enhanced/jdbc_connection.rb', line 205

def commit
  @raw_connection.commit
end

#database_version ⇒ Object 



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# File 'lib/active_record/connection_adapters/oracle_enhanced/jdbc_connection.rb', line 292

def database_version
  @database_version ||= (md = raw_connection.getMetaData) && [md.getDatabaseMajorVersion, md.getDatabaseMinorVersion]
end

#describe(name) ⇒ Object

To allow private method called from ‘JDBCConnection`



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# File 'lib/active_record/connection_adapters/oracle_enhanced/jdbc_connection.rb', line 463

def describe(name)
  super
end

#error_code(exception) ⇒ Object

Return java.sql.SQLException error code



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# File 'lib/active_record/connection_adapters/oracle_enhanced/jdbc_connection.rb', line 468

def error_code(exception)
  case exception
  when Java::JavaSql::SQLException
    exception.getErrorCode
  else
    nil
  end
end

#exec(sql) ⇒ Object 



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# File 'lib/active_record/connection_adapters/oracle_enhanced/jdbc_connection.rb', line 259

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 265

def exec_no_retry(sql)
  case sql
  when /\A\s*(UPDATE|INSERT|DELETE)/i
    s = @raw_connection.prepareStatement(sql)
    s.executeUpdate
  # it is safer for CREATE and DROP statements not to use PreparedStatement
  # as it does not allow creation of triggers with :NEW in their definition
  when /\A\s*(CREATE|DROP)/i
    s = @raw_connection.createStatement()
    # this disables SQL92 syntax processing of {...} which can result in statement execution errors
    # if sql contains {...} in strings or comments
    s.setEscapeProcessing(false)
    s.execute(sql)
    true
  else
    s = @raw_connection.prepareStatement(sql)
    s.execute
    true
  end
ensure
  s.close rescue nil
end

#get_ruby_value_from_result_set(rset, i, type_name, get_lob_value = true) ⇒ Object 



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

def get_ruby_value_from_result_set(rset, i, type_name, get_lob_value = true)
  case type_name
  when :NUMBER
    d = rset.getNUMBER(i)
    if d.nil?
      nil
    elsif d.isInt
      Integer(d.stringValue)
    else
      BigDecimal(d.stringValue)
    end
  when :BINARY_FLOAT
    rset.getFloat(i)
  when :VARCHAR2, :LONG, :NVARCHAR2
    rset.getString(i)
  when :CHAR, :NCHAR
    char_str = rset.getString(i)
    if !char_str.nil?
      char_str.rstrip
    end
  when :DATE
    if dt = rset.getDATE(i)
      d = dt.dateValue
      t = dt.timeValue
      Time.send(ActiveRecord.default_timezone, d.year + 1900, d.month + 1, d.date, t.hours, t.minutes, t.seconds)
    else
      nil
    end
  when :TIMESTAMP, :TIMESTAMPTZ, :TIMESTAMPLTZ, :"TIMESTAMP WITH TIME ZONE", :"TIMESTAMP WITH LOCAL TIME ZONE"
    ts = rset.getTimestamp(i)
    ts && Time.send(ActiveRecord.default_timezone, ts.year + 1900, ts.month + 1, ts.date, ts.hours, ts.minutes, ts.seconds,
      ts.nanos / 1000)
  when :CLOB
    get_lob_value ? lob_to_ruby_value(rset.getClob(i)) : rset.getClob(i)
  when :NCLOB
    get_lob_value ? lob_to_ruby_value(rset.getClob(i)) : rset.getClob(i)
  when :BLOB
    get_lob_value ? lob_to_ruby_value(rset.getBlob(i)) : rset.getBlob(i)
  when :RAW
    raw_value = rset.getRAW(i)
    raw_value && raw_value.getBytes.to_a.pack("C*")
  else
    nil
  end
end

#logoff ⇒ Object 



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# File 'lib/active_record/connection_adapters/oracle_enhanced/jdbc_connection.rb', line 193

def logoff
  @active = false
  if defined?(@pooled_connection)
    @pooled_connection.close
  else
    @raw_connection.close
  end
  true
rescue
  false
end

#new_connection(config) ⇒ Object

modified method to support JNDI connections



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# File 'lib/active_record/connection_adapters/oracle_enhanced/jdbc_connection.rb', line 70

def new_connection(config)
  username = nil

  if config[:jndi]
    jndi = config[:jndi].to_s
    ctx = javax.naming.InitialContext.new
    ds = nil

    # tomcat needs first lookup method, oc4j (and maybe other application servers) need second method
    begin
      env = ctx.lookup("java:/comp/env")
      ds = env.lookup(jndi)
    rescue
      ds = ctx.lookup(jndi)
    end

    # check if datasource supports pooled connections, otherwise use default
    if ds.respond_to?(:pooled_connection)
      @raw_connection = ds.pooled_connection
    else
      @raw_connection = ds.connection
    end

    # get Oracle JDBC connection when using DBCP in Tomcat or jBoss
    if @raw_connection.respond_to?(:getInnermostDelegate)
      @pooled_connection = @raw_connection
      @raw_connection = @raw_connection.innermost_delegate
    elsif @raw_connection.respond_to?(:getUnderlyingConnection)
      @pooled_connection = @raw_connection
      @raw_connection = @raw_connection.underlying_connection
    end

    # Workaround FrozenError (can't modify frozen Hash):
    config = config.dup
    config[:driver] ||= @raw_connection.meta_data.connection.java_class.name
    username = @raw_connection.meta_data.user_name
  else
    # to_s needed if username, password or database is specified as number in database.yml file
    username = config[:username] && config[:username].to_s
    password = config[:password] && config[:password].to_s
    database = config[:database] && config[:database].to_s || "XE"
    host, port = config[:host], config[:port]
    privilege = config[:privilege] && config[:privilege].to_s

    # connection using TNS alias, or connection-string from DATABASE_URL
    using_tns_alias = !host && !config[:url] && ENV["TNS_ADMIN"]
    if database && (using_tns_alias || host == "connection-string")
      url = "jdbc:oracle:thin:@#{database}"
    else
      unless database.match?(/^(:|\/)/)
        # assume database is a SID if no colon or slash are supplied (backward-compatibility)
        database = "/#{database}"
      end
      url = config[:url] || "jdbc:oracle:thin:@//#{host || 'localhost'}:#{port || 1521}#{database}"
    end

    prefetch_rows = config[:prefetch_rows] || 100
    # get session time_zone from configuration or from TZ environment variable
    time_zone = config[:time_zone] || ENV["TZ"] || java.util.TimeZone.default.getID

    properties = java.util.Properties.new
    raise "username not set" unless username
    raise "password not set" unless password
    properties.put("user", username)
    properties.put("password", password)
    properties.put("defaultRowPrefetch", "#{prefetch_rows}") if prefetch_rows
    properties.put("internal_logon", privilege) if privilege

    begin
      @raw_connection = java.sql.DriverManager.getConnection(url, properties)
    rescue
      # bypass DriverManager to work in cases where ojdbc*.jar
      # is added to the load path at runtime and not on the
      # system classpath
      @raw_connection = ORACLE_DRIVER.connect(url, properties)
    end

    # Set session time zone to current time zone
    if ActiveRecord.default_timezone == :local
      @raw_connection.setSessionTimeZone(time_zone)
    elsif ActiveRecord.default_timezone == :utc
      @raw_connection.setSessionTimeZone("UTC")
    end

    if config[:jdbc_statement_cache_size]
      raise "Integer value expected for :jdbc_statement_cache_size" unless config[:jdbc_statement_cache_size].instance_of? Integer
      @raw_connection.setImplicitCachingEnabled(true)
      @raw_connection.setStatementCacheSize(config[:jdbc_statement_cache_size])
    end

    # Set default number of rows to prefetch
    # @raw_connection.setDefaultRowPrefetch(prefetch_rows) if prefetch_rows
  end

  cursor_sharing = config[:cursor_sharing] || "force"
  exec "alter session set cursor_sharing = #{cursor_sharing}" if cursor_sharing

  # Initialize NLS parameters
  OracleEnhancedAdapter::DEFAULT_NLS_PARAMETERS.each do |key, default_value|
    value = config[key] || ENV[key.to_s.upcase] || default_value
    if value
      exec "alter session set #{key} = '#{value}'"
    end
  end

  OracleEnhancedAdapter::FIXED_NLS_PARAMETERS.each do |key, value|
    exec "alter session set #{key} = '#{value}'"
  end

  self.autocommit = true

  schema = config[:schema] && config[:schema].to_s
  if schema.blank?
    # default schema owner
    @owner = username.upcase unless username.nil?
  else
    exec "alter session set current_schema = #{schema}"
    @owner = schema
  end

  @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 224

def ping
  exec_no_retry("select 1 from dual")
  @active = true
rescue Java::JavaSql::SQLException => e
  @active = false
  raise OracleEnhanced::ConnectionException, e.message
end

#prepare(sql) ⇒ Object 



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# File 'lib/active_record/connection_adapters/oracle_enhanced/jdbc_connection.rb', line 288

def prepare(sql)
  Cursor.new(self, @raw_connection.prepareStatement(sql))
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 233

def reset!
  logoff rescue nil
  begin
    new_connection(@config)
    @active = true
  rescue Java::JavaSql::SQLException => e
    @active = false
    raise OracleEnhanced::ConnectionException, e.message
  end
end

#rollback ⇒ Object 



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# File 'lib/active_record/connection_adapters/oracle_enhanced/jdbc_connection.rb', line 209

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 413

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 419

def select_no_retry(sql, name = nil, return_column_names = false)
  stmt = @raw_connection.prepareStatement(sql)
  rset = stmt.executeQuery

  # Reuse the same hash for all rows
  column_hash = {}

  metadata = rset.getMetaData
  column_count = metadata.getColumnCount

  cols_types_index = (1..column_count).map do |i|
    col_name = _oracle_downcase(metadata.getColumnName(i))
    next if col_name == "raw_rnum_"
    column_hash[col_name] = nil
    [col_name, metadata.getColumnTypeName(i).to_sym, i]
  end
  cols_types_index.delete(nil)

  rows = []
  get_lob_value = !(name == "Writable Large Object")

  while rset.next
    hash = column_hash.dup
    cols_types_index.each do |col, column_type, i|
      hash[col] = get_ruby_value_from_result_set(rset, i, column_type, get_lob_value)
    end
    rows << hash
  end

  return_column_names ? [rows, cols_types_index.map(&:first)] : 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 245

def with_retry(&block)
  should_retry = auto_retry? && autocommit?
  begin
    yield if block_given?
  rescue Java::JavaSql::SQLException => e
    raise unless /^(Closed Connection|Io exception:|No more data to read from socket|IO Error:)/.match?(e.message)
    @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 454

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