Class: ActiveRecord::ConnectionAdapters::SQLite3Adapter
- Inherits:
-
AbstractAdapter
- Object
- AbstractAdapter
- ActiveRecord::ConnectionAdapters::SQLite3Adapter
- Includes:
- Savepoints
- Defined in:
- lib/active_record/connection_adapters/sqlite3_adapter.rb
Overview
The SQLite3 adapter works SQLite 3.6.16 or newer with the sqlite3-ruby drivers (available as gem from rubygems.org/gems/sqlite3).
Options:
-
:database
- Path to the database file.
Defined Under Namespace
Classes: ExplainPrettyPrinter, StatementPool
Constant Summary collapse
- ADAPTER_NAME =
'SQLite'.freeze
- NATIVE_DATABASE_TYPES =
{ primary_key: 'INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL', string: { name: "varchar" }, text: { name: "text" }, integer: { name: "integer" }, float: { name: "float" }, decimal: { name: "decimal" }, datetime: { name: "datetime" }, time: { name: "time" }, date: { name: "date" }, binary: { name: "blob" }, boolean: { name: "boolean" } }
Constants inherited from AbstractAdapter
Instance Attribute Summary
Attributes inherited from AbstractAdapter
#logger, #owner, #pool, #prepared_statements, #schema_cache, #visitor
Attributes included from QueryCache
#query_cache, #query_cache_enabled
Attributes included from DatabaseStatements
Instance Method Summary collapse
-
#_quote(value) ⇒ Object
QUOTING ==================================================.
-
#_type_cast(value) ⇒ Object
:nodoc:.
- #active? ⇒ Boolean
-
#add_column(table_name, column_name, type, options = {}) ⇒ Object
:nodoc:.
-
#allowed_index_name_length ⇒ Object
Returns 62.
-
#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
-
#clear_cache! ⇒ Object
Clears the prepared statements cache.
-
#columns(table_name) ⇒ Object
Returns an array of
Column
objects for the table specified bytable_name
. -
#commit_db_transaction ⇒ Object
:nodoc:.
-
#delete_sql(sql, name = nil) ⇒ Object
:nodoc:.
-
#disconnect! ⇒ Object
Disconnects from the database if already connected.
-
#encoding ⇒ Object
Returns the current database encoding format as a string, eg: ‘UTF-8’.
- #exec_delete(sql, name = 'SQL', binds = []) ⇒ Object (also: #exec_update)
- #exec_query(sql, name = nil, binds = []) ⇒ Object
-
#exec_rollback_db_transaction ⇒ Object
:nodoc:.
-
#execute(sql, name = nil) ⇒ Object
:nodoc:.
-
#explain(arel, binds = []) ⇒ Object
– DATABASE STATEMENTS ====================================== ++.
-
#indexes(table_name, name = nil) ⇒ Object
Returns an array of indexes for the given table.
-
#initialize(connection, logger, connection_options, config) ⇒ SQLite3Adapter
constructor
A new instance of SQLite3Adapter.
-
#insert_sql(sql, name = nil, pk = nil, id_value = nil, sequence_name = nil) ⇒ Object
(also: #create)
:nodoc:.
- #last_inserted_id(result) ⇒ Object
-
#native_database_types ⇒ Object
:nodoc:.
-
#primary_key(table_name) ⇒ Object
:nodoc:.
-
#quote_column_name(name) ⇒ Object
:nodoc:.
-
#quote_string(s) ⇒ Object
:nodoc:.
- #quote_table_name_for_assignment(table, attr) ⇒ Object
-
#quoted_date(value) ⇒ Object
Quote date/time values for use in SQL input.
-
#remove_column(table_name, column_name, type = nil, options = {}) ⇒ Object
:nodoc:.
-
#remove_index!(table_name, index_name) ⇒ Object
:nodoc:.
-
#rename_column(table_name, column_name, new_column_name) ⇒ Object
:nodoc:.
-
#rename_table(table_name, new_name) ⇒ Object
Renames a table.
- #requires_reloading? ⇒ Boolean
- #select_rows(sql, name = nil, binds = []) ⇒ Object
- #supports_ddl_transactions? ⇒ Boolean
- #supports_explain? ⇒ Boolean
- #supports_index_sort_order? ⇒ Boolean
-
#supports_migrations? ⇒ Boolean
Returns true, since this connection adapter supports migrations.
- #supports_partial_index? ⇒ Boolean
-
#supports_primary_key? ⇒ Boolean
:nodoc:.
- #supports_savepoints? ⇒ Boolean
-
#supports_statement_cache? ⇒ Boolean
Returns true, since this connection adapter supports prepared statement caching.
- #supports_views? ⇒ Boolean
- #table_exists?(table_name) ⇒ Boolean (also: #data_source_exists?)
-
#tables(name = nil, table_name = nil) ⇒ Object
(also: #data_sources)
SCHEMA STATEMENTS ========================================.
-
#update_sql(sql, name = nil) ⇒ Object
:nodoc:.
-
#valid_alter_table_type?(type) ⇒ Boolean
See: www.sqlite.org/lang_altertable.html SQLite has an additional restriction on the ALTER TABLE statement.
Methods included from Savepoints
#create_savepoint, #exec_rollback_to_savepoint, #release_savepoint
Methods inherited from AbstractAdapter
#adapter_name, #case_insensitive_comparison, #case_sensitive_comparison, #case_sensitive_modifier, #close, #collector, #column_name_for_operation, #create_savepoint, #current_savepoint_name, #disable_extension, #disable_referential_integrity, #enable_extension, #expire, #extensions, #index_algorithms, #lease, #lookup_cast_type, #new_column, #prefetch_primary_key?, #raw_connection, #reconnect!, #release_savepoint, #reset!, #schema_creation, #substitute_at, #supports_bulk_alter?, #supports_extensions?, #supports_foreign_keys?, #supports_indexes_in_create?, #supports_transaction_isolation?, type_cast_config_to_boolean, type_cast_config_to_integer, #type_map, #unprepared_statement, #valid_type?, #verify!
Methods included from ColumnDumper
#column_spec, #migration_keys, #prepare_column_options
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
#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, #quote_table_name, #quoted_false, #quoted_true, #type_cast, #unquoted_false, #unquoted_true
Methods included from DatabaseStatements
#add_transaction_record, #begin_isolated_db_transaction, #cacheable_query, #default_sequence_name, #delete, #empty_insert_statement_value, #exec_insert, #exec_rollback_to_savepoint, #insert, #insert_fixture, #join_to_delete, #join_to_update, #reset_sequence!, #reset_transaction, #rollback_db_transaction, #rollback_to_savepoint, #sanitize_limit, #select_all, #select_one, #select_value, #select_values, #to_sql, #transaction, #transaction_isolation_levels, #transaction_open?, #transaction_state, #truncate, #update
Methods included from SchemaStatements
#add_foreign_key, #add_index, #add_index_options, #add_reference, #add_timestamps, #assume_migrated_upto_version, #change_table, #column_exists?, #columns_for_distinct, #create_join_table, #create_table, #drop_join_table, #drop_table, #dump_schema_information, #foreign_key_column_for, #foreign_keys, #index_exists?, #index_name, #index_name_exists?, #initialize_schema_migrations_table, #remove_columns, #remove_foreign_key, #remove_index, #remove_reference, #remove_timestamps, #rename_index, #table_alias_for, #type_to_sql, #update_table_definition
Methods included from TimestampDefaultDeprecation
#emit_warning_if_null_unspecified
Constructor Details
#initialize(connection, logger, connection_options, config) ⇒ SQLite3Adapter
Returns a new instance of SQLite3Adapter.
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# File 'lib/active_record/connection_adapters/sqlite3_adapter.rb', line 112 def initialize(connection, logger, , config) super(connection, logger) @active = nil @statements = StatementPool.new(@connection, self.class.type_cast_config_to_integer(config.fetch(:statement_limit) { 1000 })) @config = config @visitor = Arel::Visitors::SQLite.new self if self.class.type_cast_config_to_boolean(config.fetch(:prepared_statements) { true }) @prepared_statements = true else @prepared_statements = false end end |
Instance Method Details
#_quote(value) ⇒ Object
QUOTING ==================================================
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# File 'lib/active_record/connection_adapters/sqlite3_adapter.rb', line 207 def _quote(value) # :nodoc: case value when Type::Binary::Data "x'#{value.hex}'" else super end end |
#_type_cast(value) ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/sqlite3_adapter.rb', line 216 def _type_cast(value) # :nodoc: case value when BigDecimal value.to_f when String if value.encoding == Encoding::ASCII_8BIT super(value.encode(Encoding::UTF_8)) else super end else super end end |
#active? ⇒ Boolean
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# File 'lib/active_record/connection_adapters/sqlite3_adapter.rb', line 164 def active? @active != false end |
#add_column(table_name, column_name, type, options = {}) ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/sqlite3_adapter.rb', line 441 def add_column(table_name, column_name, type, = {}) #:nodoc: if valid_alter_table_type?(type) super(table_name, column_name, type, ) else alter_table(table_name) do |definition| definition.column(column_name, type, ) end end end |
#allowed_index_name_length ⇒ Object
Returns 62. SQLite supports index names up to 64 characters. The rest is used by rails internally to perform temporary rename operations
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# File 'lib/active_record/connection_adapters/sqlite3_adapter.rb', line 188 def allowed_index_name_length index_name_length - 2 end |
#begin_db_transaction ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/sqlite3_adapter.rb', line 340 def begin_db_transaction #:nodoc: log('begin transaction',nil) { @connection.transaction } end |
#change_column(table_name, column_name, type, options = {}) ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/sqlite3_adapter.rb', line 472 def change_column(table_name, column_name, type, = {}) #:nodoc: alter_table(table_name) do |definition| include_default = () definition[column_name].instance_eval do self.type = type self.limit = [:limit] if .include?(:limit) self.default = [:default] if include_default self.null = [:null] if .include?(:null) self.precision = [:precision] if .include?(:precision) self.scale = [:scale] if .include?(:scale) end end end |
#change_column_default(table_name, column_name, default) ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/sqlite3_adapter.rb', line 457 def change_column_default(table_name, column_name, default) #:nodoc: alter_table(table_name) do |definition| definition[column_name].default = default end end |
#change_column_null(table_name, column_name, null, default = nil) ⇒ Object
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# File 'lib/active_record/connection_adapters/sqlite3_adapter.rb', line 463 def change_column_null(table_name, column_name, null, default = nil) unless null || default.nil? exec_query("UPDATE #{quote_table_name(table_name)} SET #{quote_column_name(column_name)}=#{quote(default)} WHERE #{quote_column_name(column_name)} IS NULL") end alter_table(table_name) do |definition| definition[column_name].null = null end end |
#clear_cache! ⇒ Object
Clears the prepared statements cache.
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# File 'lib/active_record/connection_adapters/sqlite3_adapter.rb', line 177 def clear_cache! @statements.clear end |
#columns(table_name) ⇒ Object
Returns an array of Column
objects for the table specified by table_name
.
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# File 'lib/active_record/connection_adapters/sqlite3_adapter.rb', line 374 def columns(table_name) #:nodoc: table_structure(table_name).map do |field| case field["dflt_value"] when /^null$/i field["dflt_value"] = nil when /^'(.*)'$/m field["dflt_value"] = $1.gsub("''", "'") when /^"(.*)"$/m field["dflt_value"] = $1.gsub('""', '"') end sql_type = field['type'] cast_type = lookup_cast_type(sql_type) new_column(field['name'], field['dflt_value'], cast_type, sql_type, field['notnull'].to_i == 0) end end |
#commit_db_transaction ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/sqlite3_adapter.rb', line 344 def commit_db_transaction #:nodoc: log('commit transaction',nil) { @connection.commit } end |
#delete_sql(sql, name = nil) ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/sqlite3_adapter.rb', line 325 def delete_sql(sql, name = nil) #:nodoc: sql += " WHERE 1=1" unless sql =~ /WHERE/i super sql, name end |
#disconnect! ⇒ Object
Disconnects from the database if already connected. Otherwise, this method does nothing.
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# File 'lib/active_record/connection_adapters/sqlite3_adapter.rb', line 170 def disconnect! super @active = false @connection.close rescue nil end |
#encoding ⇒ Object
Returns the current database encoding format as a string, eg: ‘UTF-8’
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# File 'lib/active_record/connection_adapters/sqlite3_adapter.rb', line 197 def encoding @connection.encoding.to_s end |
#exec_delete(sql, name = 'SQL', binds = []) ⇒ Object Also known as: exec_update
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# File 'lib/active_record/connection_adapters/sqlite3_adapter.rb', line 306 def exec_delete(sql, name = 'SQL', binds = []) exec_query(sql, name, binds) @connection.changes end |
#exec_query(sql, name = nil, binds = []) ⇒ Object
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# File 'lib/active_record/connection_adapters/sqlite3_adapter.rb', line 276 def exec_query(sql, name = nil, binds = []) type_casted_binds = binds.map { |col, val| [col, type_cast(val, col)] } log(sql, name, type_casted_binds) do # Don't cache statements if they are not prepared if without_prepared_statement?(binds) stmt = @connection.prepare(sql) begin cols = stmt.columns records = stmt.to_a ensure stmt.close end stmt = records else cache = @statements[sql] ||= { :stmt => @connection.prepare(sql) } stmt = cache[:stmt] cols = cache[:cols] ||= stmt.columns stmt.reset! stmt.bind_params type_casted_binds.map { |_, val| val } end ActiveRecord::Result.new(cols, stmt.to_a) end end |
#exec_rollback_db_transaction ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/sqlite3_adapter.rb', line 348 def exec_rollback_db_transaction #:nodoc: log('rollback transaction',nil) { @connection.rollback } end |
#execute(sql, name = nil) ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/sqlite3_adapter.rb', line 316 def execute(sql, name = nil) #:nodoc: log(sql, name) { @connection.execute(sql) } end |
#explain(arel, binds = []) ⇒ Object
– DATABASE STATEMENTS ====================================== ++
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# File 'lib/active_record/connection_adapters/sqlite3_adapter.rb', line 257 def explain(arel, binds = []) sql = "EXPLAIN QUERY PLAN #{to_sql(arel, binds)}" ExplainPrettyPrinter.new.pp(exec_query(sql, 'EXPLAIN', [])) end |
#indexes(table_name, name = nil) ⇒ Object
Returns an array of indexes for the given table.
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# File 'lib/active_record/connection_adapters/sqlite3_adapter.rb', line 392 def indexes(table_name, name = nil) #:nodoc: exec_query("PRAGMA index_list(#{quote_table_name(table_name)})", 'SCHEMA').map do |row| sql = <<-SQL SELECT sql FROM sqlite_master WHERE name=#{quote(row['name'])} AND type='index' UNION ALL SELECT sql FROM sqlite_temp_master WHERE name=#{quote(row['name'])} AND type='index' SQL index_sql = exec_query(sql).first['sql'] match = /\sWHERE\s+(.+)$/i.match(index_sql) where = match[1] if match IndexDefinition.new( table_name, row['name'], row['unique'] != 0, exec_query("PRAGMA index_info('#{row['name']}')", "SCHEMA").map { |col| col['name'] }, nil, nil, where) end end |
#insert_sql(sql, name = nil, pk = nil, id_value = nil, sequence_name = nil) ⇒ Object Also known as: create
:nodoc:
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# File 'lib/active_record/connection_adapters/sqlite3_adapter.rb', line 330 def insert_sql(sql, name = nil, pk = nil, id_value = nil, sequence_name = nil) #:nodoc: super id_value || @connection.last_insert_row_id end |
#last_inserted_id(result) ⇒ Object
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# File 'lib/active_record/connection_adapters/sqlite3_adapter.rb', line 312 def last_inserted_id(result) @connection.last_insert_row_id end |
#native_database_types ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/sqlite3_adapter.rb', line 192 def native_database_types #:nodoc: NATIVE_DATABASE_TYPES end |
#primary_key(table_name) ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/sqlite3_adapter.rb', line 416 def primary_key(table_name) #:nodoc: pks = table_structure(table_name).select { |f| f['pk'] > 0 } return nil unless pks.count == 1 pks[0]['name'] end |
#quote_column_name(name) ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/sqlite3_adapter.rb', line 239 def quote_column_name(name) #:nodoc: %Q("#{name.to_s.gsub('"', '""')}") end |
#quote_string(s) ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/sqlite3_adapter.rb', line 231 def quote_string(s) #:nodoc: @connection.class.quote(s) end |
#quote_table_name_for_assignment(table, attr) ⇒ Object
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# File 'lib/active_record/connection_adapters/sqlite3_adapter.rb', line 235 def quote_table_name_for_assignment(table, attr) quote_column_name(attr) end |
#quoted_date(value) ⇒ Object
Quote date/time values for use in SQL input. Includes microseconds if the value is a Time responding to usec.
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# File 'lib/active_record/connection_adapters/sqlite3_adapter.rb', line 245 def quoted_date(value) #:nodoc: if value.respond_to?(:usec) "#{super}.#{sprintf("%06d", value.usec)}" else super end end |
#remove_column(table_name, column_name, type = nil, options = {}) ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/sqlite3_adapter.rb', line 451 def remove_column(table_name, column_name, type = nil, = {}) #:nodoc: alter_table(table_name) do |definition| definition.remove_column column_name end end |
#remove_index!(table_name, index_name) ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/sqlite3_adapter.rb', line 422 def remove_index!(table_name, index_name) #:nodoc: exec_query "DROP INDEX #{quote_column_name(index_name)}" end |
#rename_column(table_name, column_name, new_column_name) ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/sqlite3_adapter.rb', line 486 def rename_column(table_name, column_name, new_column_name) #:nodoc: column = column_for(table_name, column_name) alter_table(table_name, rename: {column.name => new_column_name.to_s}) rename_column_indexes(table_name, column.name, new_column_name) end |
#rename_table(table_name, new_name) ⇒ Object
Renames a table.
Example:
rename_table('octopuses', 'octopi')
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# File 'lib/active_record/connection_adapters/sqlite3_adapter.rb', line 430 def rename_table(table_name, new_name) exec_query "ALTER TABLE #{quote_table_name(table_name)} RENAME TO #{quote_table_name(new_name)}" rename_table_indexes(table_name, new_name) end |
#requires_reloading? ⇒ Boolean
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# File 'lib/active_record/connection_adapters/sqlite3_adapter.rb', line 156 def requires_reloading? true end |
#select_rows(sql, name = nil, binds = []) ⇒ Object
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# File 'lib/active_record/connection_adapters/sqlite3_adapter.rb', line 336 def select_rows(sql, name = nil, binds = []) exec_query(sql, name, binds).rows end |
#supports_ddl_transactions? ⇒ Boolean
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# File 'lib/active_record/connection_adapters/sqlite3_adapter.rb', line 129 def supports_ddl_transactions? true end |
#supports_explain? ⇒ Boolean
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# File 'lib/active_record/connection_adapters/sqlite3_adapter.rb', line 201 def supports_explain? true end |
#supports_index_sort_order? ⇒ Boolean
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# File 'lib/active_record/connection_adapters/sqlite3_adapter.rb', line 181 def supports_index_sort_order? true end |
#supports_migrations? ⇒ Boolean
Returns true, since this connection adapter supports migrations.
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# File 'lib/active_record/connection_adapters/sqlite3_adapter.rb', line 148 def supports_migrations? #:nodoc: true end |
#supports_partial_index? ⇒ Boolean
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# File 'lib/active_record/connection_adapters/sqlite3_adapter.rb', line 137 def supports_partial_index? sqlite_version >= '3.8.0' end |
#supports_primary_key? ⇒ Boolean
:nodoc:
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# File 'lib/active_record/connection_adapters/sqlite3_adapter.rb', line 152 def supports_primary_key? #:nodoc: true end |
#supports_savepoints? ⇒ Boolean
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# File 'lib/active_record/connection_adapters/sqlite3_adapter.rb', line 133 def supports_savepoints? true end |
#supports_statement_cache? ⇒ Boolean
Returns true, since this connection adapter supports prepared statement caching.
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# File 'lib/active_record/connection_adapters/sqlite3_adapter.rb', line 143 def supports_statement_cache? true end |
#supports_views? ⇒ Boolean
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# File 'lib/active_record/connection_adapters/sqlite3_adapter.rb', line 160 def supports_views? true end |
#table_exists?(table_name) ⇒ Boolean Also known as: data_source_exists?
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# File 'lib/active_record/connection_adapters/sqlite3_adapter.rb', line 368 def table_exists?(table_name) table_name && tables(nil, table_name).any? end |
#tables(name = nil, table_name = nil) ⇒ Object Also known as: data_sources
SCHEMA STATEMENTS ========================================
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# File 'lib/active_record/connection_adapters/sqlite3_adapter.rb', line 354 def tables(name = nil, table_name = nil) #:nodoc: sql = <<-SQL SELECT name FROM sqlite_master WHERE (type = 'table' OR type = 'view') AND NOT name = 'sqlite_sequence' SQL sql << " AND name = #{quote_table_name(table_name)}" if table_name exec_query(sql, 'SCHEMA').map do |row| row['name'] end end |
#update_sql(sql, name = nil) ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/sqlite3_adapter.rb', line 320 def update_sql(sql, name = nil) #:nodoc: super @connection.changes end |
#valid_alter_table_type?(type) ⇒ Boolean
See: www.sqlite.org/lang_altertable.html SQLite has an additional restriction on the ALTER TABLE statement
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# File 'lib/active_record/connection_adapters/sqlite3_adapter.rb', line 437 def valid_alter_table_type?(type) type.to_sym != :primary_key end |