Class: Sequel::SQLite::Database

Inherits:
Database show all
Includes:
DatabaseMethods
Defined in:
lib/sequel/adapters/sqlite.rb

Overview

Database class for SQLite databases used with Sequel and the ruby-sqlite3 driver.

Constant Summary collapse

DatasetClass = 
self

Constants included from DatabaseMethods

Sequel::SQLite::DatabaseMethods::AUTO_VACUUM, Sequel::SQLite::DatabaseMethods::PRIMARY_KEY_INDEX_RE, Sequel::SQLite::DatabaseMethods::SYNCHRONOUS, Sequel::SQLite::DatabaseMethods::TABLES_FILTER, Sequel::SQLite::DatabaseMethods::TEMP_STORE, Sequel::SQLite::DatabaseMethods::TRANSACTION_MODE, Sequel::SQLite::DatabaseMethods::VIEWS_FILTER

Constants inherited from Database

Database::ADAPTERS, Database::AUTOINCREMENT, Database::COLUMN_DEFINITION_ORDER, Database::COLUMN_SCHEMA_DATETIME_TYPES, Database::COLUMN_SCHEMA_STRING_TYPES, Database::COMBINABLE_ALTER_TABLE_OPS, Database::COMMA_SEPARATOR, Database::CURRENT_TIMESTAMP_RE, Database::DEFAULT_DATABASE_ERROR_REGEXPS, Database::DEFAULT_JOIN_TABLE_COLUMN_OPTIONS, Database::DEFAULT_STRING_COLUMN_SIZE, Database::EXTENSIONS, Database::NOT_NULL, Database::NULL, Database::OPTS, Database::PRIMARY_KEY, Database::SCHEMA_TYPE_CLASSES, Database::SQL_BEGIN, Database::SQL_COMMIT, Database::SQL_RELEASE_SAVEPOINT, Database::SQL_ROLLBACK, Database::SQL_ROLLBACK_TO_SAVEPOINT, Database::SQL_SAVEPOINT, Database::STRING_DEFAULT_RE, Database::TEMPORARY, Database::TRANSACTION_BEGIN, Database::TRANSACTION_COMMIT, Database::TRANSACTION_ISOLATION_LEVELS, Database::TRANSACTION_ROLLBACK, Database::UNDERSCORE, Database::UNIQUE, Database::UNSIGNED

Instance Attribute Summary collapse

Attributes included from DatabaseMethods

#integer_booleans, #transaction_mode, #use_timestamp_timezones

Attributes inherited from Database

#cache_schema, #dataset_class, #default_string_column_size, #identifier_input_method, #identifier_output_method, #log_warn_duration, #loggers, #opts, #pool, #prepared_statements, #sql_log_level, #timezone, #transaction_isolation_level

Instance Method Summary collapse

Methods included from DatabaseMethods

#auto_vacuum, #auto_vacuum=, #case_sensitive_like=, #database_type, #foreign_key_list, #foreign_keys, #foreign_keys=, #indexes, #pragma_get, #pragma_set, #set_integer_booleans, #sqlite_version, #supports_create_table_if_not_exists?, #supports_deferrable_foreign_key_constraints?, #supports_partial_indexes?, #supports_savepoints?, #synchronous, #synchronous=, #tables, #temp_store, #temp_store=, #use_timestamp_timezones?, #views

Methods included from Database::ResetIdentifierMangling

#extended

Methods inherited from Database

#<<, #[], adapter_class, #adapter_scheme, adapter_scheme, #add_column, #add_index, #add_servers, #after_commit, after_initialize, #after_rollback, #alter_table, #alter_table_generator, #call, #cast_type_literal, connect, #create_join_table, #create_join_table!, #create_join_table?, #create_or_replace_view, #create_table, #create_table!, #create_table?, #create_table_generator, #create_view, #database_type, #dataset, #disconnect, #drop_column, #drop_index, #drop_join_table, #drop_table, #drop_table?, #drop_view, #each_server, #extend_datasets, extension, #extension, #fetch, #from, #from_application_timestamp, #get, #global_index_namespace?, #in_transaction?, #initialize, #inspect, #literal, #literal_symbol, #literal_symbol_set, load_adapter, #log_exception, #log_info, #log_yield, #logger=, #prepared_statement, #quote_identifier, #quote_identifiers=, #quote_identifiers?, register_extension, #remove_servers, #rename_column, #rename_table, #run, run_after_initialize, #schema, #schema_type_class, #select, #serial_primary_key_options, #servers, #set_column_default, #set_column_type, #set_prepared_statement, #sharded?, #single_threaded?, #supports_create_table_if_not_exists?, #supports_deferrable_constraints?, #supports_deferrable_foreign_key_constraints?, #supports_drop_table_if_exists?, #supports_foreign_key_parsing?, #supports_index_parsing?, #supports_partial_indexes?, #supports_prepared_transactions?, #supports_savepoints?, #supports_savepoints_in_prepared_transactions?, #supports_schema_parsing?, #supports_table_listing?, #supports_transaction_isolation_levels?, #supports_transactional_ddl?, #supports_view_listing?, #supports_views_with_check_option?, #supports_views_with_local_check_option?, #synchronize, #table_exists?, #test_connection, #transaction, #typecast_value, #uri, #url, #valid_connection?

Methods included from Metaprogramming

#meta_def

Constructor Details

This class inherits a constructor from Sequel::Database

Instance Attribute Details

#conversion_procs ⇒ Object (readonly)

The conversion procs to use for this database



92
93
94
 
# File 'lib/sequel/adapters/sqlite.rb', line 92

def conversion_procs
  @conversion_procs
end

Instance Method Details

#connect(server) ⇒ Object

Connect to the database. Since SQLite is a file based database, available options are limited:

:database

database name (filename or ‘:memory:’ or file: URI)

:readonly

open database in read-only mode; useful for reading static data that you do not want to modify

:timeout

how long to wait for the database to be available if it is locked, given in milliseconds (default is 5000)



102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
 
# File 'lib/sequel/adapters/sqlite.rb', line 102

def connect(server)
  opts = server_opts(server)
  opts[:database] = ':memory:' if blank_object?(opts[:database])
  sqlite3_opts = {}
  sqlite3_opts[:readonly] = typecast_value_boolean(opts[:readonly]) if opts.has_key?(:readonly)
  db = ::SQLite3::Database.new(opts[:database].to_s, sqlite3_opts)
  db.busy_timeout(opts.fetch(:timeout, 5000))
  
  connection_pragmas.each{|s| log_yield(s){db.execute_batch(s)}}
  
  class << db
    attr_reader :prepared_statements
  end
  db.instance_variable_set(:@prepared_statements, {})
  
  db
end

#disconnect_connection(c) ⇒ Object

Disconnect given connections from the database.



121
122
123
124
 
# File 'lib/sequel/adapters/sqlite.rb', line 121

def disconnect_connection(c)
  c.prepared_statements.each_value{|v| v.first.close}
  c.close
end

#execute(sql, opts = OPTS, &block) ⇒ Object

Run the given SQL with the given arguments and yield each row.



127
128
129
 
# File 'lib/sequel/adapters/sqlite.rb', line 127

def execute(sql, opts=OPTS, &block)
  _execute(:select, sql, opts, &block)
end

#execute_ddl(sql, opts = OPTS) ⇒ Object

Drop any prepared statements on the connection when executing DDL. This is because prepared statements lock the table in such a way that you can’t drop or alter the table while a prepared statement that references it still exists.



139
140
141
142
143
144
145
 
# File 'lib/sequel/adapters/sqlite.rb', line 139

def execute_ddl(sql, opts=OPTS)
  synchronize(opts[:server]) do |conn|
    conn.prepared_statements.values.each{|cps, s| cps.close}
    conn.prepared_statements.clear
    super
  end
end

#execute_dui(sql, opts = OPTS) ⇒ Object

Run the given SQL with the given arguments and return the number of changed rows.



132
133
134
 
# File 'lib/sequel/adapters/sqlite.rb', line 132

def execute_dui(sql, opts=OPTS)
  _execute(:update, sql, opts)
end

#execute_insert(sql, opts = OPTS) ⇒ Object

Run the given SQL with the given arguments and return the last inserted row id.



148
149
150
 
# File 'lib/sequel/adapters/sqlite.rb', line 148

def execute_insert(sql, opts=OPTS)
  _execute(:insert, sql, opts)
end

#to_application_timestamp(s) ⇒ Object

Handle Integer and Float arguments, since SQLite can store timestamps as integers and floats.



153
154
155
156
157
158
159
160
161
162
163
164
 
# File 'lib/sequel/adapters/sqlite.rb', line 153

def to_application_timestamp(s)
  case s
  when String
    super
  when Integer
    super(Time.at(s).to_s)
  when Float
    super(DateTime.jd(s).to_s)
  else
    raise Sequel::Error, "unhandled type when converting to : #{s.inspect} (#{s.class.inspect})"
  end
end