455 lines
15 KiB
Ruby
455 lines
15 KiB
Ruby
# encoding: binary
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require 'active_record/connection_adapters/abstract_adapter'
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module ActiveRecord
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class Base
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class << self
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# Establishes a connection to the database that's used by all Active Record objects
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def sqlite_connection(config) # :nodoc:
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parse_sqlite_config!(config)
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unless self.class.const_defined?(:SQLite)
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require_library_or_gem(config[:adapter])
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db = SQLite::Database.new(config[:database], 0)
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db.show_datatypes = "ON" if !defined? SQLite::Version
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db.results_as_hash = true if defined? SQLite::Version
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db.type_translation = false
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message = "Support for SQLite2Adapter and DeprecatedSQLiteAdapter has been removed from Rails 3. "
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message << "You should migrate to SQLite 3+ or use the plugin from git://github.com/rails/sqlite2_adapter.git with Rails 3."
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ActiveSupport::Deprecation.warn(message)
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# "Downgrade" deprecated sqlite API
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if SQLite.const_defined?(:Version)
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ConnectionAdapters::SQLite2Adapter.new(db, logger, config)
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else
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ConnectionAdapters::DeprecatedSQLiteAdapter.new(db, logger, config)
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end
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end
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end
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private
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def parse_sqlite_config!(config)
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if config.include?(:dbfile)
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ActiveSupport::Deprecation.warn "Please update config/database.yml to use 'database' instead of 'dbfile'"
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end
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config[:database] ||= config[:dbfile]
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# Require database.
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unless config[:database]
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raise ArgumentError, "No database file specified. Missing argument: database"
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end
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# Allow database path relative to RAILS_ROOT, but only if
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# the database path is not the special path that tells
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# Sqlite to build a database only in memory.
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if Object.const_defined?(:RAILS_ROOT) && ':memory:' != config[:database]
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config[:database] = File.expand_path(config[:database], RAILS_ROOT)
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end
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end
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end
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end
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module ConnectionAdapters #:nodoc:
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class SQLiteColumn < Column #:nodoc:
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class << self
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def string_to_binary(value)
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value = value.dup.force_encoding(Encoding::BINARY) if value.respond_to?(:force_encoding)
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value.gsub(/\0|\%/n) do |b|
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case b
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when "\0" then "%00"
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when "%" then "%25"
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end
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end
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end
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def binary_to_string(value)
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value = value.dup.force_encoding(Encoding::BINARY) if value.respond_to?(:force_encoding)
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value.gsub(/%00|%25/n) do |b|
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case b
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when "%00" then "\0"
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when "%25" then "%"
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end
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end
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end
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end
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end
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# The SQLite adapter works with both the 2.x and 3.x series of SQLite with the sqlite-ruby drivers (available both as gems and
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# from http://rubyforge.org/projects/sqlite-ruby/).
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#
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# Options:
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#
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# * <tt>:database</tt> - Path to the database file.
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class SQLiteAdapter < AbstractAdapter
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class Version
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include Comparable
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def initialize(version_string)
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@version = version_string.split('.').map(&:to_i)
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end
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def <=>(version_string)
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@version <=> version_string.split('.').map(&:to_i)
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end
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end
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def initialize(connection, logger, config)
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super(connection, logger)
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@config = config
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end
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def adapter_name #:nodoc:
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'SQLite'
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end
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def supports_ddl_transactions?
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sqlite_version >= '2.0.0'
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end
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def supports_migrations? #:nodoc:
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true
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end
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def supports_primary_key? #:nodoc:
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true
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end
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def requires_reloading?
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true
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end
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def supports_add_column?
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sqlite_version >= '3.1.6'
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end
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def disconnect!
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super
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@connection.close rescue nil
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end
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def supports_count_distinct? #:nodoc:
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sqlite_version >= '3.2.6'
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end
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def supports_autoincrement? #:nodoc:
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sqlite_version >= '3.1.0'
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end
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def native_database_types #:nodoc:
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{
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:primary_key => default_primary_key_type,
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:string => { :name => "varchar", :limit => 255 },
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:text => { :name => "text" },
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:integer => { :name => "integer" },
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:float => { :name => "float" },
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:decimal => { :name => "decimal" },
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:datetime => { :name => "datetime" },
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:timestamp => { :name => "datetime" },
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:time => { :name => "time" },
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:date => { :name => "date" },
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:binary => { :name => "blob" },
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:boolean => { :name => "boolean" }
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}
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end
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# QUOTING ==================================================
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def quote_string(s) #:nodoc:
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@connection.class.quote(s)
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end
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def quote_column_name(name) #:nodoc:
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%Q("#{name.to_s.gsub('"', '""')}")
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end
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# DATABASE STATEMENTS ======================================
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def execute(sql, name = nil) #:nodoc:
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catch_schema_changes { log(sql, name) { @connection.execute(sql) } }
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end
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def update_sql(sql, name = nil) #:nodoc:
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super
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@connection.changes
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end
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def delete_sql(sql, name = nil) #:nodoc:
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sql += " WHERE 1=1" unless sql =~ /WHERE/i
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super sql, name
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end
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def insert_sql(sql, name = nil, pk = nil, id_value = nil, sequence_name = nil) #:nodoc:
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super || @connection.last_insert_row_id
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end
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def select_rows(sql, name = nil)
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execute(sql, name).map do |row|
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(0...(row.size / 2)).map { |i| row[i] }
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end
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end
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def begin_db_transaction #:nodoc:
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catch_schema_changes { @connection.transaction }
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end
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def commit_db_transaction #:nodoc:
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catch_schema_changes { @connection.commit }
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end
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def rollback_db_transaction #:nodoc:
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catch_schema_changes { @connection.rollback }
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end
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# SELECT ... FOR UPDATE is redundant since the table is locked.
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def add_lock!(sql, options) #:nodoc:
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sql
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end
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# SCHEMA STATEMENTS ========================================
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def tables(name = nil) #:nodoc:
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sql = <<-SQL
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SELECT name
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FROM sqlite_master
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WHERE type = 'table' AND NOT name = 'sqlite_sequence'
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SQL
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execute(sql, name).map do |row|
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row['name']
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end
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end
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def columns(table_name, name = nil) #:nodoc:
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table_structure(table_name).map do |field|
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SQLiteColumn.new(field['name'], field['dflt_value'], field['type'], field['notnull'].to_i == 0)
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end
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end
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def indexes(table_name, name = nil) #:nodoc:
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execute("PRAGMA index_list(#{quote_table_name(table_name)})", name).map do |row|
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index = IndexDefinition.new(table_name, row['name'])
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index.unique = row['unique'].to_i != 0
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index.columns = execute("PRAGMA index_info('#{index.name}')").map { |col| col['name'] }
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index
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end
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end
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def primary_key(table_name) #:nodoc:
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column = table_structure(table_name).find {|field| field['pk'].to_i == 1}
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column ? column['name'] : nil
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end
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def remove_index!(table_name, index_name) #:nodoc:
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execute "DROP INDEX #{quote_column_name(index_name)}"
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end
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def rename_table(name, new_name)
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execute "ALTER TABLE #{name} RENAME TO #{new_name}"
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end
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# See: http://www.sqlite.org/lang_altertable.html
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# SQLite has an additional restriction on the ALTER TABLE statement
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def valid_alter_table_options( type, options)
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type.to_sym != :primary_key
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end
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def add_column(table_name, column_name, type, options = {}) #:nodoc:
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if supports_add_column? && valid_alter_table_options( type, options )
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super(table_name, column_name, type, options)
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else
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alter_table(table_name) do |definition|
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definition.column(column_name, type, options)
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end
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end
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end
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def remove_column(table_name, *column_names) #:nodoc:
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raise ArgumentError.new("You must specify at least one column name. Example: remove_column(:people, :first_name)") if column_names.empty?
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column_names.flatten.each do |column_name|
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alter_table(table_name) do |definition|
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definition.columns.delete(definition[column_name])
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end
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end
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end
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alias :remove_columns :remove_column
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def change_column_default(table_name, column_name, default) #:nodoc:
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alter_table(table_name) do |definition|
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definition[column_name].default = default
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end
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end
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def change_column_null(table_name, column_name, null, default = nil)
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unless null || default.nil?
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execute("UPDATE #{quote_table_name(table_name)} SET #{quote_column_name(column_name)}=#{quote(default)} WHERE #{quote_column_name(column_name)} IS NULL")
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end
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alter_table(table_name) do |definition|
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definition[column_name].null = null
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end
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end
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def change_column(table_name, column_name, type, options = {}) #:nodoc:
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alter_table(table_name) do |definition|
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include_default = options_include_default?(options)
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definition[column_name].instance_eval do
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self.type = type
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self.limit = options[:limit] if options.include?(:limit)
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self.default = options[:default] if include_default
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self.null = options[:null] if options.include?(:null)
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end
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end
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end
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def rename_column(table_name, column_name, new_column_name) #:nodoc:
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unless columns(table_name).detect{|c| c.name == column_name.to_s }
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raise ActiveRecord::ActiveRecordError, "Missing column #{table_name}.#{column_name}"
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end
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alter_table(table_name, :rename => {column_name.to_s => new_column_name.to_s})
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end
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def empty_insert_statement(table_name)
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"INSERT INTO #{table_name} VALUES(NULL)"
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end
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protected
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def select(sql, name = nil) #:nodoc:
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execute(sql, name).map do |row|
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record = {}
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row.each_key do |key|
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if key.is_a?(String)
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record[key.sub(/^"?\w+"?\./, '')] = row[key]
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end
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end
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record
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end
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end
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def table_structure(table_name)
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execute("PRAGMA table_info(#{quote_table_name(table_name)})").tap do |structure|
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raise(ActiveRecord::StatementInvalid, "Could not find table '#{table_name}'") if structure.empty?
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end
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end
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def alter_table(table_name, options = {}) #:nodoc:
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altered_table_name = "altered_#{table_name}"
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caller = lambda {|definition| yield definition if block_given?}
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transaction do
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move_table(table_name, altered_table_name,
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options.merge(:temporary => true))
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move_table(altered_table_name, table_name, &caller)
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end
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end
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def move_table(from, to, options = {}, &block) #:nodoc:
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copy_table(from, to, options, &block)
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drop_table(from)
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end
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def copy_table(from, to, options = {}) #:nodoc:
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options = options.merge(:id => (!columns(from).detect{|c| c.name == 'id'}.nil? && 'id' == primary_key(from).to_s))
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create_table(to, options) do |definition|
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@definition = definition
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columns(from).each do |column|
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column_name = options[:rename] ?
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(options[:rename][column.name] ||
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options[:rename][column.name.to_sym] ||
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column.name) : column.name
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@definition.column(column_name, column.type,
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:limit => column.limit, :default => column.default,
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:null => column.null)
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end
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@definition.primary_key(primary_key(from)) if primary_key(from)
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yield @definition if block_given?
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end
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copy_table_indexes(from, to, options[:rename] || {})
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copy_table_contents(from, to,
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@definition.columns.map {|column| column.name},
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options[:rename] || {})
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end
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def copy_table_indexes(from, to, rename = {}) #:nodoc:
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indexes(from).each do |index|
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name = index.name
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if to == "altered_#{from}"
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name = "temp_#{name}"
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elsif from == "altered_#{to}"
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name = name[5..-1]
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end
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to_column_names = columns(to).map(&:name)
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columns = index.columns.map {|c| rename[c] || c }.select do |column|
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to_column_names.include?(column)
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end
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unless columns.empty?
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# index name can't be the same
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opts = { :name => name.gsub(/_(#{from})_/, "_#{to}_") }
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opts[:unique] = true if index.unique
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add_index(to, columns, opts)
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end
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end
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end
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def copy_table_contents(from, to, columns, rename = {}) #:nodoc:
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column_mappings = Hash[*columns.map {|name| [name, name]}.flatten]
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rename.inject(column_mappings) {|map, a| map[a.last] = a.first; map}
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from_columns = columns(from).collect {|col| col.name}
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columns = columns.find_all{|col| from_columns.include?(column_mappings[col])}
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quoted_columns = columns.map { |col| quote_column_name(col) } * ','
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quoted_to = quote_table_name(to)
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@connection.execute "SELECT * FROM #{quote_table_name(from)}" do |row|
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sql = "INSERT INTO #{quoted_to} (#{quoted_columns}) VALUES ("
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sql << columns.map {|col| quote row[column_mappings[col]]} * ', '
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sql << ')'
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@connection.execute sql
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end
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end
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def catch_schema_changes
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return yield
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rescue ActiveRecord::StatementInvalid => exception
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if exception.message =~ /database schema has changed/
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reconnect!
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retry
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else
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raise
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end
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end
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def sqlite_version
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@sqlite_version ||= SQLiteAdapter::Version.new(select_value('select sqlite_version(*)'))
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end
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def default_primary_key_type
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if supports_autoincrement?
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'INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL'.freeze
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else
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'INTEGER PRIMARY KEY NOT NULL'.freeze
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end
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end
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end
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class SQLite2Adapter < SQLiteAdapter # :nodoc:
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def rename_table(name, new_name)
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move_table(name, new_name)
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end
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end
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class DeprecatedSQLiteAdapter < SQLite2Adapter # :nodoc:
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def insert(sql, name = nil, pk = nil, id_value = nil)
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execute(sql, name = nil)
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id_value || @connection.last_insert_rowid
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end
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end
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end
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end
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