Module: ArJdbc::Oracle

Defined in:
lib/arjdbc/oracle/adapter.rb

Defined Under Namespace

Modules: Column

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.column_selectorObject



32
33
34
# File 'lib/arjdbc/oracle/adapter.rb', line 32

def self.column_selector
  [/oracle/i, lambda {|cfg,col| col.extend(::ArJdbc::Oracle::Column)}]
end

.extended(mod) ⇒ Object



7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
# File 'lib/arjdbc/oracle/adapter.rb', line 7

def self.extended(mod)
  unless @lob_callback_added
    ActiveRecord::Base.class_eval do
      def after_save_with_oracle_lob
        self.class.columns.select { |c| c.sql_type =~ /LOB\(|LOB$/i }.each do |c|
          value = self[c.name]
          value = value.to_yaml if unserializable_attribute?(c.name, c)
          next if value.nil?  || (value == '')

          connection.write_large_object(c.type == :binary, c.name, self.class.table_name, self.class.primary_key, quote_value(id), value)
        end
      end
    end

    ActiveRecord::Base.after_save :after_save_with_oracle_lob
    @lob_callback_added = true
  end
  require 'arjdbc/jdbc/quoted_primary_key'
  ActiveRecord::Base.extend ArJdbc::QuotedPrimaryKeyExtension
  (class << mod; self; end).class_eval do
    alias_chained_method :insert, :query_dirty, :ora_insert
    alias_chained_method :columns, :query_cache, :ora_columns
  end
end

.jdbc_connection_classObject



36
37
38
# File 'lib/arjdbc/oracle/adapter.rb', line 36

def self.jdbc_connection_class
  ::ActiveRecord::ConnectionAdapters::OracleJdbcConnection
end

Instance Method Details

#_execute(sql, name = nil) ⇒ Object



189
190
191
192
193
194
195
196
# File 'lib/arjdbc/oracle/adapter.rb', line 189

def _execute(sql, name = nil)
  case sql.strip
    when /\A\(?\s*(select|show)/i then
      @connection.execute_query(sql)
    else
      @connection.execute_update(sql)
    end
end

#adapter_nameObject



109
110
111
# File 'lib/arjdbc/oracle/adapter.rb', line 109

def adapter_name
  'Oracle'
end

#add_column_options!(sql, options) ⇒ Object

:nodoc:



230
231
232
233
234
235
236
# File 'lib/arjdbc/oracle/adapter.rb', line 230

def add_column_options!(sql, options) #:nodoc:
  # handle case  of defaults for CLOB columns, which would otherwise get "quoted" incorrectly
  if options_include_default?(options) && (column = options[:column]) && column.type == :text
    sql << " DEFAULT #{quote(options.delete(:default))}"
  end
  super
end

#add_limit_offset!(sql, options) ⇒ Object

:nodoc:



208
209
210
211
212
213
214
215
216
# File 'lib/arjdbc/oracle/adapter.rb', line 208

def add_limit_offset!(sql, options) #:nodoc:
  offset = options[:offset] || 0

  if limit = options[:limit]
    sql.replace "select * from (select raw_sql_.*, rownum raw_rnum_ from (#{sql}) raw_sql_ where rownum <= #{offset+limit}) where raw_rnum_ > #{offset}"
  elsif offset > 0
    sql.replace "select * from (select raw_sql_.*, rownum raw_rnum_ from (#{sql}) raw_sql_) where raw_rnum_ > #{offset}"
  end
end

#add_order_by_for_association_limiting!(sql, options) ⇒ Object

ORDER BY clause for the passed order option.

Uses column aliases as defined by #distinct.



323
324
325
326
327
328
329
330
331
# File 'lib/arjdbc/oracle/adapter.rb', line 323

def add_order_by_for_association_limiting!(sql, options)
  return sql if options[:order].blank?

  order = options[:order].split(',').collect { |s| s.strip }.reject(&:blank?)
  order.map! {|s| $1 if s =~ / (.*)/}
  order = order.zip((0...order.size).to_a).map { |s,i| "alias_#{i}__ #{s}" }.join(', ')

  sql << "ORDER BY #{order}"
end

#arel2_visitorsObject



113
114
115
# File 'lib/arjdbc/oracle/adapter.rb', line 113

def arel2_visitors
  { 'oracle' => Arel::Visitors::Oracle }
end

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

:nodoc:



238
239
240
241
242
# File 'lib/arjdbc/oracle/adapter.rb', line 238

def change_column(table_name, column_name, type, options = {}) #:nodoc:
  change_column_sql = "ALTER TABLE #{table_name} MODIFY #{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:



226
227
228
# File 'lib/arjdbc/oracle/adapter.rb', line 226

def change_column_default(table_name, column_name, default) #:nodoc:
  execute "ALTER TABLE #{table_name} MODIFY #{column_name} DEFAULT #{quote(default)}"
end

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

:nodoc:

Raises:

  • (ActiveRecord::StatementInvalid)


130
131
132
133
134
135
136
# File 'lib/arjdbc/oracle/adapter.rb', line 130

def create_table(name, options = {}) #:nodoc:
  super(name, options)
  seq_name = options[:sequence_name] || default_sequence_name(name)
  start_value = options[:sequence_start_value] || 10000
  raise ActiveRecord::StatementInvalid.new("name #{seq_name} too long") if seq_name.length > table_alias_length
  execute "CREATE SEQUENCE #{seq_name} START WITH #{start_value}" unless options[:id] == false
end

#current_databaseObject

:nodoc:



218
219
220
# File 'lib/arjdbc/oracle/adapter.rb', line 218

def current_database #:nodoc:
  select_one("select sys_context('userenv','db_name') db from dual")["db"]
end

#default_sequence_name(table, column = nil) ⇒ Object

:nodoc:



126
127
128
# File 'lib/arjdbc/oracle/adapter.rb', line 126

def default_sequence_name(table, column = nil) #:nodoc:
  "#{table}_seq"
end

#distinct(columns, order_by) ⇒ Object

SELECT DISTINCT clause for a given set of columns and a given ORDER BY clause.

Oracle requires the ORDER BY columns to be in the SELECT list for DISTINCT queries. However, with those columns included in the SELECT DISTINCT list, you won’t actually get a distinct list of the column you want (presuming the column has duplicates with multiple values for the ordered-by columns. So we use the FIRST_VALUE function to get a single (first) value for each column, effectively making every row the same.

distinct("posts.id", "posts.created_at desc")


307
308
309
310
311
312
313
314
315
316
317
318
# File 'lib/arjdbc/oracle/adapter.rb', line 307

def distinct(columns, order_by)
  return "DISTINCT #{columns}" if order_by.blank?

  # construct a valid DISTINCT clause, ie. one that includes the ORDER BY columns, using
  # FIRST_VALUE such that the inclusion of these columns doesn't invalidate the DISTINCT
  order_columns = order_by.split(',').map { |s| s.strip }.reject(&:blank?)
  order_columns = order_columns.zip((0...order_columns.size).to_a).map do |c, i|
    "FIRST_VALUE(#{c.split.first}) OVER (PARTITION BY #{columns} ORDER BY #{c}) AS alias_#{i}__"
  end
  sql = "DISTINCT #{columns}, "
  sql << order_columns * ", "
end

#drop_database(name) ⇒ Object



153
154
155
# File 'lib/arjdbc/oracle/adapter.rb', line 153

def drop_database(name)
  recreate_database(name)
end

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

:nodoc:



143
144
145
146
147
# File 'lib/arjdbc/oracle/adapter.rb', line 143

def drop_table(name, options = {}) #:nodoc:
  super(name) rescue nil
  seq_name = options[:sequence_name] || default_sequence_name(name)
  execute "DROP SEQUENCE #{seq_name}" rescue nil
end

#indexes(table, name = nil) ⇒ Object



185
186
187
# File 'lib/arjdbc/oracle/adapter.rb', line 185

def indexes(table, name = nil)
  @connection.indexes(table, name, @connection.connection..user_name)
end

#modify_types(tp) ⇒ Object



198
199
200
201
202
203
204
205
206
# File 'lib/arjdbc/oracle/adapter.rb', line 198

def modify_types(tp)
  tp[:primary_key] = "NUMBER(38) NOT NULL PRIMARY KEY"
  tp[:integer] = { :name => "NUMBER", :limit => 38 }
  tp[:datetime] = { :name => "DATE" }
  tp[:timestamp] = { :name => "DATE" }
  tp[:time] = { :name => "DATE" }
  tp[:date] = { :name => "DATE" }
  tp
end

#next_sequence_value(sequence_name) ⇒ Object



157
158
159
160
# File 'lib/arjdbc/oracle/adapter.rb', line 157

def next_sequence_value(sequence_name)
  # avoid #select or #select_one so that the sequence values aren't cached
  execute("select #{sequence_name}.nextval id from dual").first['id'].to_i
end

#ora_columns(table_name, name = nil) ⇒ Object



337
338
339
# File 'lib/arjdbc/oracle/adapter.rb', line 337

def ora_columns(table_name, name=nil)
  @connection.columns_internal(table_name, name, oracle_schema)
end

#ora_insert(sql, name = nil, pk = nil, id_value = nil, sequence_name = nil, binds = []) ⇒ Object

:nodoc:



166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
# File 'lib/arjdbc/oracle/adapter.rb', line 166

def ora_insert(sql, name = nil, pk = nil, id_value = nil, sequence_name = nil, binds = []) #:nodoc:
  if (id_value && !sql_literal?(id_value)) || pk.nil?
    # Pre-assigned id or table without a primary key
    # Presence of #to_sql means an Arel literal bind variable
    # that should use #execute_id_insert below
    execute sql, name, binds
  else
    # Assume the sql contains a bind-variable for the id
    # Extract the table from the insert sql. Yuck.
    table = sql.split(" ", 4)[2].gsub('"', '')
    sequence_name ||= default_sequence_name(table)
    id_value = next_sequence_value(sequence_name)
    log(sql, name) do
      @connection.execute_id_insert(sql,id_value)
    end
  end
  id_value
end

#quote(value, column = nil) ⇒ Object

:nodoc:



365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
# File 'lib/arjdbc/oracle/adapter.rb', line 365

def quote(value, column = nil) #:nodoc:
  # Arel 2 passes SqlLiterals through
  return value if sql_literal?(value)

  if column && [:text, :binary].include?(column.type)
    if /(.*?)\([0-9]+\)/ =~ column.sql_type
      %Q{empty_#{ $1.downcase }()}
    else
      %Q{empty_#{ column.sql_type.downcase rescue 'blob' }()}
    end
  else
    if column.respond_to?(:primary) && column.primary && column.klass != String
      return value.to_i.to_s
    end
    quoted = super
    if value.acts_like?(:date)
      quoted = %Q{DATE'#{quoted_date(value)}'}
    elsif value.acts_like?(:time)
      quoted = %Q{TIMESTAMP'#{quoted_date(value)}'}
    end
    quoted
  end
end

#quote_column_name(name) ⇒ Object

Camelcase column names need to be quoted. Nonquoted identifiers can contain only alphanumeric characters from your database character set and the underscore (_), dollar sign ($), and pound sign (#). Database links can also contain periods (.) and “at” signs (@). Oracle strongly discourages you from using $ and # in nonquoted identifiers. Source: download.oracle.com/docs/cd/B28359_01/server.111/b28286/sql_elements008.htm



357
358
359
# File 'lib/arjdbc/oracle/adapter.rb', line 357

def quote_column_name(name) #:nodoc:
  name.to_s =~ /^[a-z0-9_$#]+$/ ? name.to_s : "\"#{name}\""
end

#quote_string(string) ⇒ Object

:nodoc:



361
362
363
# File 'lib/arjdbc/oracle/adapter.rb', line 361

def quote_string(string) #:nodoc:
  string.gsub(/'/, "''")
end

#quote_table_name(name) ⇒ Object

See ACTIVERECORD_JDBC-33 for details – better to not quote table names, esp. if they have schemas.



347
348
349
# File 'lib/arjdbc/oracle/adapter.rb', line 347

def quote_table_name(name) #:nodoc:
  name.to_s
end

#quoted_falseObject

:nodoc:



393
394
395
# File 'lib/arjdbc/oracle/adapter.rb', line 393

def quoted_false #:nodoc:
  '0'
end

#quoted_trueObject

:nodoc:



389
390
391
# File 'lib/arjdbc/oracle/adapter.rb', line 389

def quoted_true #:nodoc:
  '1'
end

#recreate_database(name) ⇒ Object



149
150
151
# File 'lib/arjdbc/oracle/adapter.rb', line 149

def recreate_database(name)
  tables.each{ |table| drop_table(table) }
end

#remove_column(table_name, column_name) ⇒ Object

:nodoc:



248
249
250
# File 'lib/arjdbc/oracle/adapter.rb', line 248

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

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

:nodoc:



222
223
224
# File 'lib/arjdbc/oracle/adapter.rb', line 222

def remove_index(table_name, options = {}) #:nodoc:
  execute "DROP INDEX #{index_name(table_name, options)}"
end

#rename_column(table_name, column_name, new_column_name) ⇒ Object

:nodoc:



244
245
246
# File 'lib/arjdbc/oracle/adapter.rb', line 244

def rename_column(table_name, column_name, new_column_name) #:nodoc:
  execute "ALTER TABLE #{table_name} RENAME COLUMN #{column_name} to #{new_column_name}"
end

#rename_table(name, new_name) ⇒ Object

:nodoc:



138
139
140
141
# File 'lib/arjdbc/oracle/adapter.rb', line 138

def rename_table(name, new_name) #:nodoc:
  execute "RENAME #{name} TO #{new_name}"
  execute "RENAME #{name}_seq TO #{new_name}_seq" rescue nil
end

#sql_literal?(value) ⇒ Boolean

Returns:

  • (Boolean)


162
163
164
# File 'lib/arjdbc/oracle/adapter.rb', line 162

def sql_literal?(value)
  defined?(::Arel::SqlLiteral) && ::Arel::SqlLiteral === value
end

#structure_dropObject

:nodoc:



287
288
289
290
291
292
293
294
295
# File 'lib/arjdbc/oracle/adapter.rb', line 287

def structure_drop #:nodoc:
  s = select_all("select sequence_name from user_sequences").inject("") do |drop, seq|
    drop << "drop sequence #{seq.to_a.first.last};\n\n"
  end

  select_all("select table_name from user_tables").inject(s) do |drop, table|
    drop << "drop table #{table.to_a.first.last} cascade constraints;\n\n"
  end
end

#structure_dumpObject

:nodoc:



252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
# File 'lib/arjdbc/oracle/adapter.rb', line 252

def structure_dump #:nodoc:
  s = select_all("select sequence_name from user_sequences").inject("") do |structure, seq|
    structure << "create sequence #{seq.to_a.first.last};\n\n"
  end

  select_all("select table_name from user_tables").inject(s) do |structure, table|
    ddl = "create table #{table.to_a.first.last} (\n "
    cols = select_all(%Q{
          select column_name, data_type, data_length, data_precision, data_scale, data_default, nullable
          from user_tab_columns
          where table_name = '#{table.to_a.first.last}'
          order by column_id
        }).map do |row|
      row = row.inject({}) do |h,args|
        h[args[0].downcase] = args[1]
        h
      end
      col = "#{row['column_name'].downcase} #{row['data_type'].downcase}"
      if row['data_type'] =='NUMBER' and !row['data_precision'].nil?
        col << "(#{row['data_precision'].to_i}"
        col << ",#{row['data_scale'].to_i}" if !row['data_scale'].nil?
        col << ')'
      elsif row['data_type'].include?('CHAR')
        col << "(#{row['data_length'].to_i})"
      end
      col << " default #{row['data_default']}" if !row['data_default'].nil?
      col << ' not null' if row['nullable'] == 'N'
      col
    end
    ddl << cols.join(",\n ")
    ddl << ");\n\n"
    structure << ddl
  end
end

#table_alias_lengthObject

TODO: use this instead of the QuotedPrimaryKey logic and execute_id_insert? def prefetch_primary_key?(table_name = nil)

columns(table_name).detect {|c| c.primary } if table_name

end



122
123
124
# File 'lib/arjdbc/oracle/adapter.rb', line 122

def table_alias_length
  30
end

#tablesObject



333
334
335
# File 'lib/arjdbc/oracle/adapter.rb', line 333

def tables
  @connection.tables(nil, oracle_schema)
end