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.



63
64
65
66
67
 
# 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.



56
57
58
 
# 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.



59
60
61
 
# 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 



211
212
213
 
# File 'lib/active_record/connection_adapters/oracle_enhanced/jdbc_connection.rb', line 211

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

#autocommit? ⇒ Boolean

Returns:

  • (Boolean) 


207
208
209
 
# File 'lib/active_record/connection_adapters/oracle_enhanced/jdbc_connection.rb', line 207

def autocommit?
  @raw_connection.getAutoCommit
end

#commit ⇒ Object 



199
200
201
 
# File 'lib/active_record/connection_adapters/oracle_enhanced/jdbc_connection.rb', line 199

def commit
  @raw_connection.commit
end

#database_version ⇒ Object 



286
287
288
 
# File 'lib/active_record/connection_adapters/oracle_enhanced/jdbc_connection.rb', line 286

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

#describe(name) ⇒ Object

To allow private method called from `JDBCConnection`



457
458
459
 
# File 'lib/active_record/connection_adapters/oracle_enhanced/jdbc_connection.rb', line 457

def describe(name)
  super
end

#error_code(exception) ⇒ Object

Return java.sql.SQLException error code



462
463
464
465
466
467
468
469
 
# File 'lib/active_record/connection_adapters/oracle_enhanced/jdbc_connection.rb', line 462

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

#exec(sql) ⇒ Object 



253
254
255
256
257
 
# File 'lib/active_record/connection_adapters/oracle_enhanced/jdbc_connection.rb', line 253

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

#exec_no_retry(sql) ⇒ Object 



259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
 
# File 'lib/active_record/connection_adapters/oracle_enhanced/jdbc_connection.rb', line 259

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 



471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
 
# File 'lib/active_record/connection_adapters/oracle_enhanced/jdbc_connection.rb', line 471

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(Base.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(Base.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 



187
188
189
190
191
192
193
194
195
196
197
 
# File 'lib/active_record/connection_adapters/oracle_enhanced/jdbc_connection.rb', line 187

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



70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
 
# 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::Base.default_timezone == :local
      @raw_connection.setSessionTimeZone(time_zone)
    elsif ActiveRecord::Base.default_timezone == :utc
      @raw_connection.setSessionTimeZone("UTC")
    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.



218
219
220
221
222
223
224
 
# File 'lib/active_record/connection_adapters/oracle_enhanced/jdbc_connection.rb', line 218

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 



282
283
284
 
# File 'lib/active_record/connection_adapters/oracle_enhanced/jdbc_connection.rb', line 282

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

#reset! ⇒ Object

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



227
228
229
230
231
232
233
234
235
236
 
# File 'lib/active_record/connection_adapters/oracle_enhanced/jdbc_connection.rb', line 227

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 



203
204
205
 
# File 'lib/active_record/connection_adapters/oracle_enhanced/jdbc_connection.rb', line 203

def rollback
  @raw_connection.rollback
end

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



407
408
409
410
411
 
# File 'lib/active_record/connection_adapters/oracle_enhanced/jdbc_connection.rb', line 407

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 



413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
 
# File 'lib/active_record/connection_adapters/oracle_enhanced/jdbc_connection.rb', line 413

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



239
240
241
242
243
244
245
246
247
248
249
250
251
 
# File 'lib/active_record/connection_adapters/oracle_enhanced/jdbc_connection.rb', line 239

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 



448
449
450
451
452
453
454
 
# File 'lib/active_record/connection_adapters/oracle_enhanced/jdbc_connection.rb', line 448

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