Class: ActiveRecord::ConnectionAdapters::RubyfbAdapter
- Inherits:
-
AbstractAdapter
- Object
- AbstractAdapter
- ActiveRecord::ConnectionAdapters::RubyfbAdapter
- Defined in:
- lib/active_record/connection_adapters/rubyfb_adapter.rb
Overview
The Firebird adapter relies on the FireRuby extension, version 0.4.0 or later (available as a gem or from RubyForge). FireRuby works with Firebird 1.5.x on Linux, OS X and Win32 platforms.
Usage Notes
Sequence (Generator) Names
The Firebird adapter supports the same approach adopted for the Oracle adapter. See ActiveRecord::Base#set_sequence_name for more details.
Note that in general there is no need to create a BEFORE INSERT
trigger corresponding to a Firebird sequence generator when using ActiveRecord. In other words, you don’t have to try to make Firebird simulate an AUTO_INCREMENT
or IDENTITY
column. When saving a new record, ActiveRecord pre-fetches the next sequence value for the table and explicitly includes it in the INSERT
statement. (Pre-fetching the next primary key value is the only reliable method for the Firebird adapter to report back the id
after a successful insert.)
BOOLEAN Domain
Firebird 1.5 does not provide a native BOOLEAN
type. But you can easily define a BOOLEAN
domain for this purpose, e.g.:
CREATE DOMAIN D_BOOLEAN AS SMALLINT CHECK (VALUE IN (0, 1) OR VALUE IS NULL);
When the Firebird adapter encounters a column that is based on a domain that includes “BOOLEAN” in the domain name, it will attempt to treat the column as a BOOLEAN
.
By default, the Firebird adapter will assume that the BOOLEAN domain is defined as above. This can be modified if needed. For example, if you have a legacy schema with the following BOOLEAN
domain defined:
CREATE DOMAIN BOOLEAN AS CHAR(1) CHECK (VALUE IN ('T', 'F'));
…you can add the following line to your environment.rb
file:
ActiveRecord::ConnectionAdapters::RubyfbAdapter.boolean_domain = { :true => 'T', :false => 'F' }
BLOB Elements
The Firebird adapter currently provides only limited support for BLOB
columns. You cannot currently retrieve a BLOB
as an IO stream. When selecting a BLOB
, the entire element is converted into a String. BLOB
handling is supported by writing an empty BLOB
to the database on insert/update and then executing a second query to save the BLOB
.
Column Name Case Semantics
Firebird and ActiveRecord have somewhat conflicting case semantics for column names.
- Firebird
-
The standard practice is to use unquoted column names, which can be thought of as case-insensitive. (In fact, Firebird converts them to uppercase.) Quoted column names (not typically used) are case-sensitive.
- ActiveRecord
-
Attribute accessors corresponding to column names are case-sensitive. The defaults for primary key and inheritance columns are lowercase, and in general, people use lowercase attribute names.
In order to map between the differing semantics in a way that conforms to common usage for both Firebird and ActiveRecord, uppercase column names in Firebird are converted to lowercase attribute names in ActiveRecord, and vice-versa. Mixed-case column names retain their case in both directions. Lowercase (quoted) Firebird column names are not supported. This is similar to the solutions adopted by other adapters.
In general, the best approach is to use unqouted (case-insensitive) column names in your Firebird DDL (or if you must quote, use uppercase column names). These will correspond to lowercase attributes in ActiveRecord.
For example, a Firebird table based on the following DDL:
CREATE TABLE products (
id BIGINT NOT NULL PRIMARY KEY,
"TYPE" VARCHAR(50),
name VARCHAR(255) );
…will correspond to an ActiveRecord model class called Product
with the following attributes: id
, type
, name
.
Quoting "TYPE"
and other Firebird reserved words:
In ActiveRecord, the default inheritance column name is type
. The word type is a Firebird reserved word, so it must be quoted in any Firebird SQL statements. Because of the case mapping described above, you should always reference this column using quoted-uppercase syntax ("TYPE"
) within Firebird DDL or other SQL statements (as in the example above). This holds true for any other Firebird reserved words used as column names as well.
Migrations
The Firebird Adapter now supports Migrations.
Create/Drop Table and Sequence Generators
Creating or dropping a table will automatically create/drop a correpsonding sequence generator, using the default naming convension. You can specify a different name using the :sequence
option; no generator is created if :sequence
is set to false
.
Rename Table
The Firebird #rename_table Migration should be used with caution. Firebird 1.5 lacks built-in support for this feature, so it is implemented by making a copy of the original table (including column definitions, indexes and data records), and then dropping the original table. Constraints and Triggers are not properly copied, so avoid this method if your original table includes constraints (other than the primary key) or triggers. (Consider manually copying your table or using a view instead.)
Connection Options
The following options are supported by the Firebird adapter. None of the options have default values.
:database
-
Required option. Specifies one of: (i) a Firebird database alias; (ii) the full path of a database file; or (iii) a full Firebird connection string. Do not specify
:host
,:service
or:port
as separate options when using a full connection string. :host
-
Set to
"remote.host.name"
for remote database connections. May be omitted for local connections if a full database path is specified for:database
. Some platforms require a value of"localhost"
for local connections when using a Firebird database alias. :service
-
Specifies a service name for the connection. Only used if
:host
is provided. Required when connecting to a non-standard service. :port
-
Specifies the connection port. Only used if
:host
is provided and:service
is not. Required when connecting to a non-standard port and:service
is not defined. :username
-
Specifies the database user. May be omitted or set to
nil
(together with:password
) to use the underlying operating system user credentials on supported platforms. :password
-
Specifies the database password. Must be provided if
:username
is explicitly specified; should be omitted if OS user credentials are are being used. :charset
-
Specifies the character set to be used by the connection. Refer to Firebird documentation for valid options.
Constant Summary collapse
- TEMP_COLUMN_NAME =
'AR$TEMP_COLUMN'
- @@boolean_domain =
{ :name => "d_boolean", :type => "smallint", :true => 1, :false => 0 }
Instance Method Summary collapse
-
#active? ⇒ Boolean
CONNECTION MANAGEMENT ====================================.
-
#adapter_name ⇒ Object
:nodoc:.
-
#add_column(table_name, column_name, type, options = {}) ⇒ Object
:nodoc:.
-
#add_limit_offset!(sql, options) ⇒ Object
:nodoc:.
-
#begin_db_transaction ⇒ Object
:nodoc:.
-
#change_column(table_name, column_name, type, options = {}) ⇒ Object
:nodoc:.
-
#change_column_default(table_name, column_name, default) ⇒ Object
:nodoc:.
- #change_column_null(table_name, column_name, null, default = nil) ⇒ Object
-
#columns(table_name, name = nil) ⇒ Object
:nodoc:.
-
#commit_db_transaction ⇒ Object
:nodoc:.
-
#create_table(name, options = {}) ⇒ Object
:nodoc:.
-
#current_database ⇒ Object
SCHEMA STATEMENTS ========================================.
-
#default_sequence_name(table_name, primary_key = nil) ⇒ Object
:nodoc:.
-
#disconnect! ⇒ Object
:nodoc:.
-
#drop_table(name, options = {}) ⇒ Object
:nodoc:.
-
#dump_schema_information ⇒ Object
:nodoc:.
-
#execute(sql, name = nil, &block) ⇒ Object
:nodoc:.
-
#indexes(table_name, name = nil) ⇒ Object
:nodoc:.
-
#initialize(connection, logger, connection_params = nil) ⇒ RubyfbAdapter
constructor
A new instance of RubyfbAdapter.
-
#insert_fixture(fixture, table_name) ⇒ Object
Inserts the given fixture into the table.
-
#native_database_types ⇒ Object
:nodoc:.
-
#next_sequence_value(sequence_name) ⇒ Object
Returns the next sequence value from a sequence generator.
-
#prefetch_primary_key?(table_name = nil) ⇒ Boolean
Returns true for Firebird adapter (since Firebird requires primary key values to be pre-fetched before insert).
-
#quote(value, column = nil) ⇒ Object
We use quoting in order to implement BLOB handling.
-
#quote_column_name(column_name) ⇒ Object
:nodoc:.
-
#quote_string(string) ⇒ Object
:nodoc:.
-
#quoted_false ⇒ Object
:nodoc:.
-
#quoted_true ⇒ Object
:nodoc:.
-
#reconnect! ⇒ Object
:nodoc:.
-
#recreate_database! ⇒ Object
:nodoc:.
-
#remove_index(table_name, options) ⇒ Object
:nodoc:.
-
#rename_column(table_name, column_name, new_column_name) ⇒ Object
:nodoc:.
-
#rename_table(name, new_name) ⇒ Object
:nodoc:.
-
#rollback_db_transaction ⇒ Object
:nodoc:.
-
#select_rows(sql, name = nil) ⇒ Object
DATABASE STATEMENTS ======================================.
-
#supports_migrations? ⇒ Boolean
:nodoc:.
-
#tables(name = nil) ⇒ Object
:nodoc:.
-
#type_to_sql(type, limit = nil, precision = nil, scale = nil) ⇒ Object
:nodoc:.
-
#write_blobs(table_name, klass, attributes) ⇒ Object
Writes BLOB values from attributes, as indicated by the BLOB columns of klass.
Constructor Details
#initialize(connection, logger, connection_params = nil) ⇒ RubyfbAdapter
Returns a new instance of RubyfbAdapter.
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# File 'lib/active_record/connection_adapters/rubyfb_adapter.rb', line 270 def initialize(connection, logger, connection_params = nil) super(connection, logger) @connection_params = connection_params end |
Instance Method Details
#active? ⇒ Boolean
CONNECTION MANAGEMENT ====================================
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# File 'lib/active_record/connection_adapters/rubyfb_adapter.rb', line 349 def active? # :nodoc: return false if @connection.closed? begin execute('select first 1 cast(1 as smallint) from rdb$database') true rescue false end end |
#adapter_name ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/rubyfb_adapter.rb', line 275 def adapter_name # :nodoc: 'Rubyfb' end |
#add_column(table_name, column_name, type, options = {}) ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/rubyfb_adapter.rb', line 516 def add_column(table_name, column_name, type, = {}) # :nodoc: super rescue StatementInvalid raise unless non_existent_domain_error? create_boolean_domain super end |
#add_limit_offset!(sql, options) ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/rubyfb_adapter.rb', line 400 def add_limit_offset!(sql, ) # :nodoc: if [:limit] limit_string = "FIRST #{[:limit]}" limit_string << " SKIP #{[:offset]}" if [:offset] sql.sub!(/\A(\s*SELECT\s)/i, '\&' + limit_string + ' ') end end |
#begin_db_transaction ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/rubyfb_adapter.rb', line 384 def begin_db_transaction() # :nodoc: @transaction = @connection.start_transaction end |
#change_column(table_name, column_name, type, options = {}) ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/rubyfb_adapter.rb', line 524 def change_column(table_name, column_name, type, = {}) # :nodoc: change_column_type(table_name, column_name, type, ) change_column_position(table_name, column_name, [:position]) if .include?(:position) change_column_default(table_name, column_name, [:default]) if () change_column_null(table_name, column_name, [:null], [:default]) if .key?(:null) end |
#change_column_default(table_name, column_name, default) ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/rubyfb_adapter.rb', line 531 def change_column_default(table_name, column_name, default) # :nodoc: table_name = table_name.to_s.upcase sql = <<-end_sql UPDATE rdb$relation_fields f1 SET f1.rdb$default_source = (SELECT f2.rdb$default_source FROM rdb$relation_fields f2 WHERE f2.rdb$relation_name = '#{table_name}' AND f2.rdb$field_name = '#{TEMP_COLUMN_NAME}'), f1.rdb$default_value = (SELECT f2.rdb$default_value FROM rdb$relation_fields f2 WHERE f2.rdb$relation_name = '#{table_name}' AND f2.rdb$field_name = '#{TEMP_COLUMN_NAME}') WHERE f1.rdb$relation_name = '#{table_name}' AND f1.rdb$field_name = '#{ar_to_fb_case(column_name.to_s)}' end_sql transaction do add_column(table_name, TEMP_COLUMN_NAME, :string, :default => default) execute_statement(sql) remove_column(table_name, TEMP_COLUMN_NAME) end end |
#change_column_null(table_name, column_name, null, default = nil) ⇒ Object
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# File 'lib/active_record/connection_adapters/rubyfb_adapter.rb', line 553 def change_column_null(table_name, column_name, null, default = nil) table_name = table_name.to_s.upcase column_name = column_name.to_s.upcase unless null || default.nil? execute_statement("UPDATE #{quote_table_name(table_name)} SET #{quote_column_name(column_name)}=#{quote(default)} WHERE #{quote_column_name(column_name)} IS NULL") end execute_statement("UPDATE RDB$RELATION_FIELDS SET RDB$NULL_FLAG = #{null ? 'null' : '1'} WHERE (RDB$FIELD_NAME = '#{column_name}') and (RDB$RELATION_NAME = '#{table_name}')") end |
#columns(table_name, name = nil) ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/rubyfb_adapter.rb', line 471 def columns(table_name, name = nil) # :nodoc: sql = <<-end_sql SELECT r.rdb$field_name, r.rdb$field_source, f.rdb$field_type, f.rdb$field_sub_type, f.rdb$field_length, f.rdb$field_precision, f.rdb$field_scale, COALESCE(r.rdb$default_source, f.rdb$default_source) rdb$default_source, COALESCE(r.rdb$null_flag, f.rdb$null_flag) rdb$null_flag FROM rdb$relation_fields r JOIN rdb$fields f ON r.rdb$field_source = f.rdb$field_name WHERE r.rdb$relation_name = '#{table_name.to_s.upcase}' ORDER BY r.rdb$field_position end_sql select_rows(sql, name).collect do |row| field_values = row.collect do |value| case value when String then value.rstrip else value end end FirebirdColumn.new(self, *field_values) end end |
#commit_db_transaction ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/rubyfb_adapter.rb', line 388 def commit_db_transaction() # :nodoc: @transaction.commit ensure @transaction = nil end |
#create_table(name, options = {}) ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/rubyfb_adapter.rb', line 494 def create_table(name, = {}) # :nodoc: begin super rescue StatementInvalid raise unless non_existent_domain_error? create_boolean_domain super end unless [:id] == false or [:sequence] == false sequence_name = [:sequence] || default_sequence_name(name) create_sequence(sequence_name) end end |
#current_database ⇒ Object
SCHEMA STATEMENTS ========================================
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# File 'lib/active_record/connection_adapters/rubyfb_adapter.rb', line 442 def current_database # :nodoc: file = @connection.database.file.split(':').last File.basename(file, '.*') end |
#default_sequence_name(table_name, primary_key = nil) ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/rubyfb_adapter.rb', line 307 def default_sequence_name(table_name, primary_key = nil) # :nodoc: "#{table_name}_seq" end |
#disconnect! ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/rubyfb_adapter.rb', line 359 def disconnect! # :nodoc: @connection.close rescue nil end |
#drop_table(name, options = {}) ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/rubyfb_adapter.rb', line 508 def drop_table(name, = {}) # :nodoc: super(name) unless [:sequence] == false sequence_name = [:sequence] || default_sequence_name(name) drop_sequence(sequence_name) if sequence_exists?(sequence_name) end end |
#dump_schema_information ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/rubyfb_adapter.rb', line 593 def dump_schema_information # :nodoc: super << ";\n" end |
#execute(sql, name = nil, &block) ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/rubyfb_adapter.rb', line 375 def execute(sql, name = nil, &block) # :nodoc: exec_result = execute_statement(sql, name, &block) if exec_result.instance_of?(FireRuby::ResultSet) exec_result.close exec_result = nil end return exec_result end |
#indexes(table_name, name = nil) ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/rubyfb_adapter.rb', line 461 def indexes(table_name, name = nil) # :nodoc: (table_name, false, name).inject([]) do |indexes, row| if indexes.empty? or indexes.last.name != row[0] indexes << IndexDefinition.new(table_name, row[0].rstrip.downcase, row[1] == 1, []) end indexes.last.columns << row[2].rstrip.downcase indexes end end |
#insert_fixture(fixture, table_name) ⇒ Object
Inserts the given fixture into the table. Overridden to properly handle blobs.
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# File 'lib/active_record/connection_adapters/rubyfb_adapter.rb', line 416 def insert_fixture(fixture, table_name) super klass = fixture.class_name.constantize rescue nil if klass.respond_to?(:ancestors) && klass.ancestors.include?(ActiveRecord::Base) write_blobs(table_name, klass, fixture) end end |
#native_database_types ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/rubyfb_adapter.rb', line 283 def native_database_types # :nodoc: { :primary_key => "BIGINT NOT NULL PRIMARY KEY", :string => { :name => "varchar", :limit => 255 }, :text => { :name => "blob sub_type text" }, :integer => { :name => "bigint" }, :decimal => { :name => "decimal" }, :numeric => { :name => "numeric" }, :float => { :name => "float" }, :datetime => { :name => "timestamp" }, :timestamp => { :name => "timestamp" }, :time => { :name => "time" }, :date => { :name => "date" }, :binary => { :name => "blob sub_type 0" }, :boolean => boolean_domain } 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/rubyfb_adapter.rb', line 411 def next_sequence_value(sequence_name) FireRuby::Generator.new(sequence_name, @connection).next(1) end |
#prefetch_primary_key?(table_name = nil) ⇒ Boolean
Returns true for Firebird adapter (since Firebird requires primary key values to be pre-fetched before insert). See also #next_sequence_value.
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# File 'lib/active_record/connection_adapters/rubyfb_adapter.rb', line 303 def prefetch_primary_key?(table_name = nil) true end |
#quote(value, column = nil) ⇒ Object
We use quoting in order to implement BLOB handling. In order to do this we quote a BLOB to an empty string which will force Firebird to create an empty BLOB in the db for us. Quoting is used in some other places besides insert/update like for column defaults. That is why we are checking caller to see where we’re coming from. This isn’t perfect but It works.
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# File 'lib/active_record/connection_adapters/rubyfb_adapter.rb', line 320 def quote(value, column = nil) # :nodoc: if [Time, DateTime].include?(value.class) "CAST('#{value.strftime("%Y-%m-%d %H:%M:%S")}' AS TIMESTAMP)" elsif value && column && [:text, :binary].include?(column.type) && caller.to_s !~ /add_column_options!/i "''" else super end end |
#quote_column_name(column_name) ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/rubyfb_adapter.rb', line 334 def quote_column_name(column_name) # :nodoc: %Q("#{ar_to_fb_case(column_name.to_s)}") end |
#quote_string(string) ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/rubyfb_adapter.rb', line 330 def quote_string(string) # :nodoc: string.gsub(/'/, "''") end |
#quoted_false ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/rubyfb_adapter.rb', line 342 def quoted_false # :nodoc: quote(boolean_domain[:false]) end |
#quoted_true ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/rubyfb_adapter.rb', line 338 def quoted_true # :nodoc: quote(boolean_domain[:true]) end |
#reconnect! ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/rubyfb_adapter.rb', line 363 def reconnect! # :nodoc: disconnect! @connection = @connection.database.connect(*@connection_params) end |
#recreate_database! ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/rubyfb_adapter.rb', line 447 def recreate_database! # :nodoc: sql = "SELECT rdb$character_set_name FROM rdb$database" charset = select_rows(sql).first[0].rstrip disconnect! @connection.database.drop(*@connection_params) FireRuby::Database.create(@connection.database.file, @connection_params[0], @connection_params[1], 4096, charset) end |
#remove_index(table_name, options) ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/rubyfb_adapter.rb', line 567 def remove_index(table_name, ) #:nodoc: execute_statement("DROP INDEX #{quote_column_name(index_name(table_name, ))}") end |
#rename_column(table_name, column_name, new_column_name) ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/rubyfb_adapter.rb', line 563 def rename_column(table_name, column_name, new_column_name) # :nodoc: execute_statement("ALTER TABLE #{quote_table_name(table_name)} ALTER COLUMN #{quote_column_name(column_name)} TO #{quote_column_name(new_column_name)}") end |
#rename_table(name, new_name) ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/rubyfb_adapter.rb', line 571 def rename_table(name, new_name) # :nodoc: if table_has_constraints_or_dependencies?(name) raise ActiveRecordError, "Table #{name} includes constraints or dependencies that are not supported by " << "the Firebird rename_table migration. Try explicitly removing the constraints/" << "dependencies first, or manually renaming the table." end transaction do copy_table(name, new_name) copy_table_indexes(name, new_name) end begin copy_table_data(name, new_name) copy_sequence_value(name, new_name) rescue drop_table(new_name) raise end drop_table(name) end |
#rollback_db_transaction ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/rubyfb_adapter.rb', line 394 def rollback_db_transaction() # :nodoc: @transaction.rollback ensure @transaction = nil end |
#select_rows(sql, name = nil) ⇒ Object
DATABASE STATEMENTS ======================================
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# File 'lib/active_record/connection_adapters/rubyfb_adapter.rb', line 371 def select_rows(sql, name = nil) select_raw(sql, name).last end |
#supports_migrations? ⇒ Boolean
:nodoc:
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# File 'lib/active_record/connection_adapters/rubyfb_adapter.rb', line 279 def supports_migrations? # :nodoc: true end |
#tables(name = nil) ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/rubyfb_adapter.rb', line 456 def tables(name = nil) # :nodoc: sql = "SELECT rdb$relation_name FROM rdb$relations WHERE rdb$system_flag = 0" select_rows(sql, name).collect { |row| row[0].rstrip.downcase } end |
#type_to_sql(type, limit = nil, precision = nil, scale = nil) ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/rubyfb_adapter.rb', line 597 def type_to_sql(type, limit = nil, precision = nil, scale = nil) # :nodoc: case type when :integer then integer_sql_type(limit) when :float then float_sql_type(limit) when :string then super(type, limit, precision, scale) else super(type, limit, precision, scale) end end |
#write_blobs(table_name, klass, attributes) ⇒ Object
Writes BLOB values from attributes, as indicated by the BLOB columns of klass.
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# File 'lib/active_record/connection_adapters/rubyfb_adapter.rb', line 426 def write_blobs(table_name, klass, attributes) id = quote(attributes[klass.primary_key]) klass.columns.select { |col| col.sql_type =~ /BLOB$/i }.each do |col| value = attributes[col.name] value = value.to_yaml if col.text? && klass.serialized_attributes[col.name] value = value.read if value.respond_to?(:read) next if value.nil? || (value == '') s = FireRuby::Statement.new(@connection, @transaction, "UPDATE #{table_name} set #{col.name} = ? WHERE #{klass.primary_key} = #{id}", 3) s.execute_for([value.to_s]) s.close end end |