Class: ActiveRecord::ConnectionAdapters::AbstractMysqlAdapter
- Inherits:
-
AbstractAdapter
- Object
- AbstractAdapter
- ActiveRecord::ConnectionAdapters::AbstractMysqlAdapter
- Includes:
- Savepoints
- Defined in:
- activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb
Direct Known Subclasses
Defined Under Namespace
Classes: BindSubstitution, Column, SchemaCreation
Constant Summary collapse
- LOST_CONNECTION_ERROR_MESSAGES =
[ "Server shutdown in progress", "Broken pipe", "Lost connection to MySQL server during query", "MySQL server has gone away" ]
- NATIVE_DATABASE_TYPES =
{ :primary_key => "int(11) auto_increment PRIMARY KEY", :string => { :name => "varchar", :limit => 255 }, :text => { :name => "text" }, :integer => { :name => "int", :limit => 4 }, :float => { :name => "float" }, :decimal => { :name => "decimal" }, :datetime => { :name => "datetime" }, :timestamp => { :name => "datetime" }, :time => { :name => "time" }, :date => { :name => "date" }, :binary => { :name => "blob" }, :boolean => { :name => "tinyint", :limit => 1 } }
- INDEX_TYPES =
[:fulltext, :spatial]
- INDEX_USINGS =
[:btree, :hash]
Constants inherited from AbstractAdapter
ActiveRecord::ConnectionAdapters::AbstractAdapter::SIMPLE_INT
Constants included from ActiveSupport::Callbacks
ActiveSupport::Callbacks::CALLBACK_FILTER_TYPES
Instance Attribute Summary
Attributes inherited from AbstractAdapter
#in_use, #last_use, #logger, #pool, #schema_cache, #visitor
Attributes included from QueryCache
#query_cache, #query_cache_enabled
Instance Method Summary collapse
-
#adapter_name ⇒ Object
:nodoc:.
- #add_column_position!(sql, options) ⇒ Object
-
#add_index(table_name, column_name, options = {}) ⇒ Object
:nodoc:.
- #begin_db_transaction ⇒ Object
- #begin_isolated_db_transaction(isolation) ⇒ Object
-
#bulk_change_table(table_name, operations) ⇒ Object
:nodoc:.
- #case_insensitive_comparison(table, attribute, column, value) ⇒ Object
- #case_sensitive_modifier(node) ⇒ Object
-
#change_column(table_name, column_name, type, options = {}) ⇒ Object
:nodoc:.
- #change_column_default(table_name, column_name, default) ⇒ Object
- #change_column_null(table_name, column_name, null, default = nil) ⇒ Object
-
#charset ⇒ Object
Returns the database character set.
-
#collation ⇒ Object
Returns the database collation strategy.
-
#columns(table_name) ⇒ Object
Returns an array of
Column
objects for the table specified bytable_name
. -
#commit_db_transaction ⇒ Object
:nodoc:.
-
#create_database(name, options = {}) ⇒ Object
Create a new MySQL database with optional
:charset
and:collation
. -
#create_table(table_name, options = {}) ⇒ Object
:nodoc:.
- #current_database ⇒ Object
-
#disable_referential_integrity ⇒ Object
REFERENTIAL INTEGRITY ====================================.
-
#drop_database(name) ⇒ Object
Drops a MySQL database.
- #drop_table(table_name, options = {}) ⇒ Object
-
#each_hash(result) ⇒ Object
The two drivers have slightly different ways of yielding hashes of results, so this method must be implemented to provide a uniform interface.
- #empty_insert_statement_value ⇒ Object
-
#emulate_booleans ⇒ Object
:singleton-method: By default, the MysqlAdapter will consider all columns of type
tinyint(1)
as boolean. -
#error_number(exception) ⇒ Object
Must return the Mysql error number from the exception, if the exception has an error number.
-
#execute(sql, name = nil) ⇒ Object
Executes the SQL statement in the context of this connection.
-
#execute_and_free(sql, name = nil) {|execute(sql, name)| ... } ⇒ Object
MysqlAdapter has to free a result after using it, so we use this method to write stuff in an abstract way without concerning ourselves about whether it needs to be explicitly freed or not.
- #index_algorithms ⇒ Object
-
#indexes(table_name, name = nil) ⇒ Object
Returns an array of indexes for the given table.
-
#initialize(connection, logger, connection_options, config) ⇒ AbstractMysqlAdapter
constructor
FIXME: Make the first parameter more similar for the two adapters.
-
#join_to_update(update, select) ⇒ Object
In the simple case, MySQL allows us to place JOINs directly into the UPDATE query.
- #limited_update_conditions(where_sql, quoted_table_name, quoted_primary_key) ⇒ Object
- #native_database_types ⇒ Object
-
#new_column(field, default, type, null, collation, extra = "") ⇒ Object
Overridden by the adapters to instantiate their specific Column type.
-
#pk_and_sequence_for(table) ⇒ Object
Returns a table’s primary key and belonging sequence.
-
#primary_key(table) ⇒ Object
Returns just a table’s primary key.
-
#quote(value, column = nil) ⇒ Object
QUOTING ==================================================.
-
#quote_column_name(name) ⇒ Object
:nodoc:.
-
#quote_table_name(name) ⇒ Object
:nodoc:.
- #quoted_false ⇒ Object
- #quoted_true ⇒ Object
-
#recreate_database(name, options = {}) ⇒ Object
Drops the database specified on the
name
attribute and creates it again using the providedoptions
. -
#rename_column(table_name, column_name, new_column_name) ⇒ Object
:nodoc:.
- #rename_index(table_name, old_name, new_name) ⇒ Object
-
#rename_table(table_name, new_name) ⇒ Object
Renames a table.
-
#rollback_db_transaction ⇒ Object
:nodoc:.
- #schema_creation ⇒ Object
-
#show_variable(name) ⇒ Object
SHOW VARIABLES LIKE ‘name’.
- #strict_mode? ⇒ Boolean
-
#supports_bulk_alter? ⇒ Boolean
:nodoc:.
-
#supports_index_sort_order? ⇒ Boolean
Technically MySQL allows to create indexes with the sort order syntax but at the moment (5.5) it doesn’t yet implement them.
-
#supports_migrations? ⇒ Boolean
Returns true, since this connection adapter supports migrations.
- #supports_primary_key? ⇒ Boolean
-
#supports_transaction_isolation? ⇒ Boolean
MySQL 4 technically support transaction isolation, but it is affected by a bug where the transaction level gets persisted for the whole session:.
- #table_exists?(name) ⇒ Boolean
-
#tables(name = nil, database = nil, like = nil) ⇒ Object
:nodoc:.
- #type_cast(value, column) ⇒ Object
-
#type_to_sql(type, limit = nil, precision = nil, scale = nil) ⇒ Object
Maps logical Rails types to MySQL-specific data types.
-
#update_sql(sql, name = nil) ⇒ Object
:nodoc:.
- #valid_type?(type) ⇒ Boolean
Methods included from Savepoints
#create_savepoint, #release_savepoint, #rollback_to_savepoint, #supports_savepoints?
Methods inherited from AbstractAdapter
#active?, #active_threadsafe?, #clear_cache!, #close, #create_savepoint, #current_savepoint_name, #disable_extension, #disconnect!, #enable_extension, #expire, #extensions, #lease, #open_transactions, #prefetch_primary_key?, #raw_connection, #reconnect!, #release_savepoint, #requires_reloading?, #reset!, #rollback_to_savepoint, #substitute_at, #supports_count_distinct?, #supports_ddl_transactions?, #supports_explain?, #supports_extensions?, #supports_partial_index?, #supports_savepoints?, type_cast_config_to_boolean, type_cast_config_to_integer, #unprepared_statement, #unprepared_visitor, #verify!
Methods included from ColumnDumper
#column_spec, #migration_keys, #prepare_column_options
Methods included from ActiveSupport::Callbacks
Methods included from ActiveSupport::Concern
#append_features, extended, #included
Methods included from QueryCache
#cache, #clear_query_cache, dirties_query_cache, #disable_query_cache!, #enable_query_cache!, included, #select_all, #uncached
Methods included from DatabaseLimits
#allowed_index_name_length, #column_name_length, #columns_per_multicolumn_index, #columns_per_table, #in_clause_length, #index_name_length, #indexes_per_table, #joins_per_query, #sql_query_length, #table_alias_length, #table_name_length
Methods included from Quoting
#quote_string, #quote_table_name_for_assignment, #quoted_date
Methods included from DatabaseStatements
#add_transaction_record, #begin_transaction, #commit_transaction, #current_transaction, #default_sequence_name, #delete, #exec_delete, #exec_insert, #exec_query, #exec_update, #insert, #insert_fixture, #join_to_delete, #reset_sequence!, #reset_transaction, #rollback_transaction, #sanitize_limit, #select_all, #select_one, #select_rows, #select_value, #select_values, #supports_statement_cache?, #to_sql, #transaction, #transaction_isolation_levels, #transaction_open?, #update, #within_new_transaction
Methods included from SchemaStatements
#add_column, #add_reference, #add_timestamps, #assume_migrated_upto_version, #change_table, #column_exists?, #columns_for_distinct, #create_join_table, #drop_join_table, #dump_schema_information, #index_exists?, #index_name, #index_name_exists?, #initialize_schema_migrations_table, #remove_column, #remove_columns, #remove_index, #remove_index!, #remove_reference, #remove_timestamps, #table_alias_for, #update_table_definition
Constructor Details
#initialize(connection, logger, connection_options, config) ⇒ AbstractMysqlAdapter
FIXME: Make the first parameter more similar for the two adapters
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 175 def initialize(connection, logger, , config) super(connection, logger) @connection_options, @config = , config @quoted_column_names, @quoted_table_names = {}, {} if self.class.type_cast_config_to_boolean(config.fetch(:prepared_statements) { true }) @prepared_statements = true @visitor = Arel::Visitors::MySQL.new self else @visitor = unprepared_visitor end end |
Instance Method Details
#adapter_name ⇒ Object
:nodoc:
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 188 def adapter_name #:nodoc: self.class::ADAPTER_NAME end |
#add_column_position!(sql, options) ⇒ Object
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 560 def add_column_position!(sql, ) if [:first] sql << " FIRST" elsif [:after] sql << " AFTER #{quote_column_name([:after])}" end end |
#add_index(table_name, column_name, options = {}) ⇒ Object
:nodoc:
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 523 def add_index(table_name, column_name, = {}) #:nodoc: index_name, index_type, index_columns, , index_algorithm, index_using = (table_name, column_name, ) execute "CREATE #{index_type} INDEX #{quote_column_name(index_name)} #{index_using} ON #{quote_table_name(table_name)} (#{index_columns})#{} #{index_algorithm}" end |
#begin_db_transaction ⇒ Object
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 318 def begin_db_transaction execute "BEGIN" end |
#begin_isolated_db_transaction(isolation) ⇒ Object
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 322 def begin_isolated_db_transaction(isolation) execute "SET TRANSACTION ISOLATION LEVEL #{transaction_isolation_levels.fetch(isolation)}" begin_db_transaction end |
#bulk_change_table(table_name, operations) ⇒ Object
:nodoc:
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 463 def bulk_change_table(table_name, operations) #:nodoc: sqls = operations.map do |command, args| table, arguments = args.shift, args method = :"#{command}_sql" if respond_to?(method, true) send(method, table, *arguments) else raise "Unknown method called : #{method}(#{arguments.inspect})" end end.flatten.join(", ") execute("ALTER TABLE #{quote_table_name(table_name)} #{sqls}") end |
#case_insensitive_comparison(table, attribute, column, value) ⇒ Object
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 597 def case_insensitive_comparison(table, attribute, column, value) if column.case_sensitive? super else table[attribute].eq(value) end end |
#case_sensitive_modifier(node) ⇒ Object
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 593 def case_sensitive_modifier(node) Arel::Nodes::Bin.new(node) end |
#change_column(table_name, column_name, type, options = {}) ⇒ Object
:nodoc:
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 514 def change_column(table_name, column_name, type, = {}) #:nodoc: execute("ALTER TABLE #{quote_table_name(table_name)} #{change_column_sql(table_name, column_name, type, )}") end |
#change_column_default(table_name, column_name, default) ⇒ Object
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 499 def change_column_default(table_name, column_name, default) column = column_for(table_name, column_name) change_column table_name, column_name, column.sql_type, :default => default end |
#change_column_null(table_name, column_name, null, default = nil) ⇒ Object
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 504 def change_column_null(table_name, column_name, null, default = nil) column = column_for(table_name, column_name) unless null || default.nil? execute("UPDATE #{quote_table_name(table_name)} SET #{quote_column_name(column_name)}=#{quote(default)} WHERE #{quote_column_name(column_name)} IS NULL") end change_column table_name, column_name, column.sql_type, :null => null end |
#charset ⇒ Object
Returns the database character set.
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 390 def charset show_variable 'character_set_database' end |
#collation ⇒ Object
Returns the database collation strategy.
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 395 def collation show_variable 'collation_database' end |
#columns(table_name) ⇒ Object
Returns an array of Column
objects for the table specified by table_name
.
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 449 def columns(table_name)#:nodoc: sql = "SHOW FULL FIELDS FROM #{quote_table_name(table_name)}" execute_and_free(sql, 'SCHEMA') do |result| each_hash(result).map do |field| field_name = set_field_encoding(field[:Field]) new_column(field_name, field[:Default], field[:Type], field[:Null] == "YES", field[:Collation], field[:Extra]) end end end |
#commit_db_transaction ⇒ Object
:nodoc:
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 327 def commit_db_transaction #:nodoc: execute "COMMIT" end |
#create_database(name, options = {}) ⇒ Object
Create a new MySQL database with optional :charset
and :collation
. Charset defaults to utf8.
Example:
create_database 'charset_test', charset: 'latin1', collation: 'latin1_bin'
create_database 'matt_development'
create_database 'matt_development', charset: :big5
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 369 def create_database(name, = {}) if [:collation] execute "CREATE DATABASE `#{name}` DEFAULT CHARACTER SET `#{[:charset] || 'utf8'}` COLLATE `#{[:collation]}`" else execute "CREATE DATABASE `#{name}` DEFAULT CHARACTER SET `#{[:charset] || 'utf8'}`" end end |
#create_table(table_name, options = {}) ⇒ Object
:nodoc:
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 459 def create_table(table_name, = {}) #:nodoc: super(table_name, .reverse_merge(:options => "ENGINE=InnoDB")) end |
#current_database ⇒ Object
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 385 def current_database select_value 'SELECT DATABASE() as db' end |
#disable_referential_integrity ⇒ Object
REFERENTIAL INTEGRITY ====================================
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 288 def disable_referential_integrity #:nodoc: old = select_value("SELECT @@FOREIGN_KEY_CHECKS") begin update("SET FOREIGN_KEY_CHECKS = 0") yield ensure update("SET FOREIGN_KEY_CHECKS = #{old}") end end |
#drop_database(name) ⇒ Object
Drops a MySQL database.
Example:
drop_database('sebastian_development')
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 381 def drop_database(name) #:nodoc: execute "DROP DATABASE IF EXISTS `#{name}`" end |
#drop_table(table_name, options = {}) ⇒ Object
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 487 def drop_table(table_name, = {}) execute "DROP#{' TEMPORARY' if [:temporary]} TABLE #{quote_table_name(table_name)}" end |
#each_hash(result) ⇒ Object
The two drivers have slightly different ways of yielding hashes of results, so this method must be implemented to provide a uniform interface.
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 242 def each_hash(result) # :nodoc: raise NotImplementedError end |
#empty_insert_statement_value ⇒ Object
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 347 def empty_insert_statement_value "VALUES ()" end |
#emulate_booleans ⇒ Object
:singleton-method: By default, the MysqlAdapter will consider all columns of type tinyint(1)
as boolean. If you wish to disable this emulation (which was the default behavior in versions 0.13.1 and earlier) you can add the following line to your application.rb file:
ActiveRecord::ConnectionAdapters::Mysql[2]Adapter.emulate_booleans = false
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 141 class_attribute :emulate_booleans |
#error_number(exception) ⇒ Object
Must return the Mysql error number from the exception, if the exception has an error number.
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 253 def error_number(exception) # :nodoc: raise NotImplementedError end |
#execute(sql, name = nil) ⇒ Object
Executes the SQL statement in the context of this connection.
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 302 def execute(sql, name = nil) log(sql, name) { @connection.query(sql) } end |
#execute_and_free(sql, name = nil) {|execute(sql, name)| ... } ⇒ Object
MysqlAdapter has to free a result after using it, so we use this method to write stuff in an abstract way without concerning ourselves about whether it needs to be explicitly freed or not.
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 309 def execute_and_free(sql, name = nil) #:nodoc: yield execute(sql, name) end |
#index_algorithms ⇒ Object
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 234 def index_algorithms { default: 'ALGORITHM = DEFAULT', copy: 'ALGORITHM = COPY', inplace: 'ALGORITHM = INPLACE' } end |
#indexes(table_name, name = nil) ⇒ Object
Returns an array of indexes for the given table.
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 425 def indexes(table_name, name = nil) #:nodoc: indexes = [] current_index = nil execute_and_free("SHOW KEYS FROM #{quote_table_name(table_name)}", 'SCHEMA') do |result| each_hash(result) do |row| if current_index != row[:Key_name] next if row[:Key_name] == 'PRIMARY' # skip the primary key current_index = row[:Key_name] mysql_index_type = row[:Index_type].downcase.to_sym index_type = INDEX_TYPES.include?(mysql_index_type) ? mysql_index_type : nil index_using = INDEX_USINGS.include?(mysql_index_type) ? mysql_index_type : nil indexes << IndexDefinition.new(row[:Table], row[:Key_name], row[:Non_unique].to_i == 0, [], [], nil, nil, index_type, index_using) end indexes.last.columns << row[:Column_name] indexes.last.lengths << row[:Sub_part] end end indexes end |
#join_to_update(update, select) ⇒ Object
In the simple case, MySQL allows us to place JOINs directly into the UPDATE query. However, this does not allow for LIMIT, OFFSET and ORDER. To support these, we must use a subquery.
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 338 def join_to_update(update, select) #:nodoc: if select.limit || select.offset || select.orders.any? super else update.table select.source update.wheres = select.constraints end end |
#limited_update_conditions(where_sql, quoted_table_name, quoted_primary_key) ⇒ Object
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 605 def limited_update_conditions(where_sql, quoted_table_name, quoted_primary_key) where_sql end |
#native_database_types ⇒ Object
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 230 def native_database_types NATIVE_DATABASE_TYPES end |
#new_column(field, default, type, null, collation, extra = "") ⇒ Object
Overridden by the adapters to instantiate their specific Column type.
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 247 def new_column(field, default, type, null, collation, extra = "") # :nodoc: Column.new(field, default, type, null, collation, extra) end |
#pk_and_sequence_for(table) ⇒ Object
Returns a table’s primary key and belonging sequence.
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 575 def pk_and_sequence_for(table) execute_and_free("SHOW CREATE TABLE #{quote_table_name(table)}", 'SCHEMA') do |result| create_table = each_hash(result).first[:"Create Table"] if create_table.to_s =~ /PRIMARY KEY\s+(?:USING\s+\w+\s+)?\((.+)\)/ keys = $1.split(",").map { |key| key.delete('`"') } keys.length == 1 ? [keys.first, nil] : nil else nil end end end |
#primary_key(table) ⇒ Object
Returns just a table’s primary key
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 588 def primary_key(table) pk_and_sequence = pk_and_sequence_for(table) pk_and_sequence && pk_and_sequence.first end |
#quote(value, column = nil) ⇒ Object
QUOTING ==================================================
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 259 def quote(value, column = nil) if value.kind_of?(String) && column && column.type == :binary s = value.unpack("H*")[0] "x'#{s}'" elsif value.kind_of?(BigDecimal) value.to_s("F") else super end end |
#quote_column_name(name) ⇒ Object
:nodoc:
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 270 def quote_column_name(name) #:nodoc: @quoted_column_names[name] ||= "`#{name.to_s.gsub('`', '``')}`" end |
#quote_table_name(name) ⇒ Object
:nodoc:
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 274 def quote_table_name(name) #:nodoc: @quoted_table_names[name] ||= quote_column_name(name).gsub('.', '`.`') end |
#quoted_false ⇒ Object
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 282 def quoted_false QUOTED_FALSE end |
#quoted_true ⇒ Object
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 278 def quoted_true QUOTED_TRUE end |
#recreate_database(name, options = {}) ⇒ Object
Drops the database specified on the name
attribute and creates it again using the provided options
.
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 355 def recreate_database(name, = {}) drop_database(name) sql = create_database(name, ) reconnect! sql end |
#rename_column(table_name, column_name, new_column_name) ⇒ Object
:nodoc:
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 518 def rename_column(table_name, column_name, new_column_name) #:nodoc: execute("ALTER TABLE #{quote_table_name(table_name)} #{rename_column_sql(table_name, column_name, new_column_name)}") rename_column_indexes(table_name, column_name, new_column_name) end |
#rename_index(table_name, old_name, new_name) ⇒ Object
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 491 def rename_index(table_name, old_name, new_name) if (version[0] == 5 && version[1] >= 7) || version[0] >= 6 execute "ALTER TABLE #{quote_table_name(table_name)} RENAME INDEX #{quote_table_name(old_name)} TO #{quote_table_name(new_name)}" else super end end |
#rename_table(table_name, new_name) ⇒ Object
Renames a table.
Example:
rename_table('octopuses', 'octopi')
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 482 def rename_table(table_name, new_name) execute "RENAME TABLE #{quote_table_name(table_name)} TO #{quote_table_name(new_name)}" rename_table_indexes(table_name, new_name) end |
#rollback_db_transaction ⇒ Object
:nodoc:
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 331 def rollback_db_transaction #:nodoc: execute "ROLLBACK" end |
#schema_creation ⇒ Object
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 34 def schema_creation SchemaCreation.new self end |
#show_variable(name) ⇒ Object
SHOW VARIABLES LIKE ‘name’
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 569 def show_variable(name) variables = select_all("SHOW VARIABLES LIKE '#{name}'", 'SCHEMA') variables.first['Value'] unless variables.empty? end |
#strict_mode? ⇒ Boolean
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 609 def strict_mode? self.class.type_cast_config_to_boolean(@config.fetch(:strict, true)) end |
#supports_bulk_alter? ⇒ Boolean
:nodoc:
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 201 def supports_bulk_alter? #:nodoc: true end |
#supports_index_sort_order? ⇒ Boolean
Technically MySQL allows to create indexes with the sort order syntax but at the moment (5.5) it doesn’t yet implement them
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 207 def supports_index_sort_order? true end |
#supports_migrations? ⇒ Boolean
Returns true, since this connection adapter supports migrations.
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 193 def supports_migrations? true end |
#supports_primary_key? ⇒ Boolean
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 197 def supports_primary_key? true end |
#supports_transaction_isolation? ⇒ Boolean
MySQL 4 technically support transaction isolation, but it is affected by a bug where the transaction level gets persisted for the whole session:
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 226 def supports_transaction_isolation? version[0] >= 5 end |
#table_exists?(name) ⇒ Boolean
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 409 def table_exists?(name) return false unless name return true if tables(nil, nil, name).any? name = name.to_s schema, table = name.split('.', 2) unless table # A table was provided without a schema table = schema schema = nil end tables(nil, schema, table).any? end |
#tables(name = nil, database = nil, like = nil) ⇒ Object
:nodoc:
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 399 def tables(name = nil, database = nil, like = nil) #:nodoc: sql = "SHOW TABLES " sql << "IN #{quote_table_name(database)} " if database sql << "LIKE #{quote(like)}" if like execute_and_free(sql, 'SCHEMA') do |result| result.collect { |field| field.first } end end |
#type_cast(value, column) ⇒ Object
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 211 def type_cast(value, column) case value when TrueClass 1 when FalseClass 0 else super end end |
#type_to_sql(type, limit = nil, precision = nil, scale = nil) ⇒ Object
Maps logical Rails types to MySQL-specific data types.
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 529 def type_to_sql(type, limit = nil, precision = nil, scale = nil) case type.to_s when 'binary' case limit when 0..0xfff; "varbinary(#{limit})" when nil; "blob" when 0x1000..0xffffffff; "blob(#{limit})" else raise(ActiveRecordError, "No binary type has character length #{limit}") end when 'integer' case limit when 1; 'tinyint' when 2; 'smallint' when 3; 'mediumint' when nil, 4, 11; 'int(11)' # compatibility with MySQL default when 5..8; 'bigint' else raise(ActiveRecordError, "No integer type has byte size #{limit}") end when 'text' case limit when 0..0xff; 'tinytext' when nil, 0x100..0xffff; 'text' when 0x10000..0xffffff; 'mediumtext' when 0x1000000..0xffffffff; 'longtext' else raise(ActiveRecordError, "No text type has character length #{limit}") end else super end end |
#update_sql(sql, name = nil) ⇒ Object
:nodoc:
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 313 def update_sql(sql, name = nil) #:nodoc: super @connection.affected_rows end |
#valid_type?(type) ⇒ Boolean
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# File 'activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb', line 613 def valid_type?(type) !native_database_types[type].nil? end |