684 lines
22 KiB
Ruby
684 lines
22 KiB
Ruby
# sybase_adaptor.rb
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# Author: John Sheets <dev@metacasa.net>
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# Date: 01 Mar 2006
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#
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# Based on code from Will Sobel (http://dev.rubyonrails.org/ticket/2030)
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#
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# 17 Mar 2006: Added support for migrations; fixed issues with :boolean columns.
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#
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require 'active_record/connection_adapters/abstract_adapter'
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begin
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require 'sybsql'
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module ActiveRecord
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class Base
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# Establishes a connection to the database that's used by all Active Record objects
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def self.sybase_connection(config) # :nodoc:
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config = config.symbolize_keys
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username = config[:username] ? config[:username].to_s : 'sa'
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password = config[:password] ? config[:password].to_s : ''
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if config.has_key?(:host)
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host = config[:host]
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else
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raise ArgumentError, "No database server name specified. Missing argument: host."
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end
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if config.has_key?(:database)
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database = config[:database]
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else
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raise ArgumentError, "No database specified. Missing argument: database."
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end
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ConnectionAdapters::SybaseAdapter.new(
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SybSQL.new({'S' => host, 'U' => username, 'P' => password},
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ConnectionAdapters::SybaseAdapterContext), database, logger)
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end
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end # class Base
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module ConnectionAdapters
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# ActiveRecord connection adapter for Sybase Open Client bindings
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# (see http://raa.ruby-lang.org/project/sybase-ctlib).
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#
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# Options:
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#
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# * <tt>:host</tt> -- The name of the database server. No default, must be provided.
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# * <tt>:database</tt> -- The name of the database. No default, must be provided.
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# * <tt>:username</tt> -- Defaults to sa.
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# * <tt>:password</tt> -- Defaults to empty string.
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#
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# Usage Notes:
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#
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# * The sybase-ctlib bindings do not support the DATE SQL column type; use DATETIME instead.
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# * Table and column names are limited to 30 chars in Sybase 12.5
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# * :binary columns not yet supported
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# * :boolean columns use the BIT SQL type, which does not allow nulls or
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# indexes. If a DEFAULT is not specified for ALTER TABLE commands, the
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# column will be declared with DEFAULT 0 (false).
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#
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# Migrations:
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#
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# The Sybase adapter supports migrations, but for ALTER TABLE commands to
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# work, the database must have the database option 'select into' set to
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# 'true' with sp_dboption (see below). The sp_helpdb command lists the current
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# options for all databases.
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#
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# 1> use mydb
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# 2> go
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# 1> master..sp_dboption mydb, "select into", true
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# 2> go
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# 1> checkpoint
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# 2> go
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class SybaseAdapter < AbstractAdapter # :nodoc:
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class ColumnWithIdentity < Column
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attr_reader :identity, :primary
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def initialize(name, default, sql_type = nil, nullable = nil, identity = nil, primary = nil)
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super(name, default, sql_type, nullable)
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@default, @identity, @primary = type_cast(default), identity, primary
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end
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def simplified_type(field_type)
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case field_type
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when /int|bigint|smallint|tinyint/i then :integer
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when /float|double|decimal|money|numeric|real|smallmoney/i then :float
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when /text|ntext/i then :text
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when /binary|image|varbinary/i then :binary
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when /char|nchar|nvarchar|string|varchar/i then :string
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when /bit/i then :boolean
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when /datetime|smalldatetime/i then :datetime
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else super
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end
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end
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def self.string_to_binary(value)
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"0x#{value.unpack("H*")[0]}"
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end
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def self.binary_to_string(value)
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# FIXME: sybase-ctlib uses separate sql method for binary columns.
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value
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end
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end # class ColumnWithIdentity
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# Sybase adapter
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def initialize(connection, database, logger = nil)
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super(connection, logger)
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context = connection.context
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context.init(logger)
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@limit = @offset = 0
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unless connection.sql_norow("USE #{database}")
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raise "Cannot USE #{database}"
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end
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end
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def native_database_types
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{
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:primary_key => "numeric(9,0) IDENTITY PRIMARY KEY",
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:string => { :name => "varchar", :limit => 255 },
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:text => { :name => "text" },
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:integer => { :name => "int" },
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:float => { :name => "float", :limit => 8 },
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:datetime => { :name => "datetime" },
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:timestamp => { :name => "timestamp" },
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:time => { :name => "time" },
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:date => { :name => "datetime" },
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:binary => { :name => "image"},
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:boolean => { :name => "bit" }
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}
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end
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def adapter_name
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'Sybase'
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end
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def active?
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!(@connection.connection.nil? || @connection.connection_dead?)
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end
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def disconnect!
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@connection.close rescue nil
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end
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def reconnect!
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raise "Sybase Connection Adapter does not yet support reconnect!"
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# disconnect!
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# connect! # Not yet implemented
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end
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def table_alias_length
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30
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end
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# Check for a limit statement and parse out the limit and
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# offset if specified. Remove the limit from the sql statement
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# and call select.
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def select_all(sql, name = nil)
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select(sql, name)
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end
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# Remove limit clause from statement. This will almost always
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# contain LIMIT 1 from the caller. set the rowcount to 1 before
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# calling select.
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def select_one(sql, name = nil)
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result = select(sql, name)
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result.nil? ? nil : result.first
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end
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def columns(table_name, name = nil)
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table_structure(table_name).inject([]) do |columns, column|
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name, default, type, nullable, identity, primary = column
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columns << ColumnWithIdentity.new(name, default, type, nullable, identity, primary)
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columns
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end
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end
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def insert(sql, name = nil, pk = nil, id_value = nil, sequence_name = nil)
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begin
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table_name = get_table_name(sql)
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col = get_identity_column(table_name)
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ii_enabled = false
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if col != nil
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if query_contains_identity_column(sql, col)
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begin
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execute enable_identity_insert(table_name, true)
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ii_enabled = true
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rescue Exception => e
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raise ActiveRecordError, "IDENTITY_INSERT could not be turned ON"
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end
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end
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end
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log(sql, name) do
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execute(sql, name)
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ident = select_one("SELECT @@IDENTITY AS last_id")["last_id"]
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id_value || ident
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end
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ensure
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if ii_enabled
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begin
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execute enable_identity_insert(table_name, false)
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rescue Exception => e
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raise ActiveRecordError, "IDENTITY_INSERT could not be turned OFF"
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end
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end
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end
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end
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def execute(sql, name = nil)
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log(sql, name) do
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@connection.context.reset
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@connection.set_rowcount(@limit || 0)
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@limit = @offset = nil
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@connection.sql_norow(sql)
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if @connection.cmd_fail? or @connection.context.failed?
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raise "SQL Command Failed for #{name}: #{sql}\nMessage: #{@connection.context.message}"
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end
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end
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# Return rows affected
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@connection.results[0].row_count
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end
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alias_method :update, :execute
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alias_method :delete, :execute
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def begin_db_transaction() execute "BEGIN TRAN" end
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def commit_db_transaction() execute "COMMIT TRAN" end
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def rollback_db_transaction() execute "ROLLBACK TRAN" end
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def tables(name = nil)
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tables = []
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select("select name from sysobjects where type='U'", name).each do |row|
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tables << row['name']
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end
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tables
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end
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def indexes(table_name, name = nil)
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indexes = []
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select("exec sp_helpindex #{table_name}", name).each do |index|
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unique = index["index_description"] =~ /unique/
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primary = index["index_description"] =~ /^clustered/
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if !primary
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cols = index["index_keys"].split(", ").each { |col| col.strip! }
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indexes << IndexDefinition.new(table_name, index["index_name"], unique, cols)
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end
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end
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indexes
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end
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def quoted_true
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"1"
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end
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def quoted_false
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"0"
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end
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def quote(value, column = nil)
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case value
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when String
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if column && column.type == :binary && column.class.respond_to?(:string_to_binary)
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"#{quote_string(column.class.string_to_binary(value))}"
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elsif value =~ /^[+-]?[0-9]+$/o
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value
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else
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"'#{quote_string(value)}'"
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end
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when NilClass then (column && column.type == :boolean) ? '0' : "NULL"
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when TrueClass then '1'
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when FalseClass then '0'
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when Float, Fixnum, Bignum then value.to_s
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when Date then "'#{value.to_s}'"
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when Time, DateTime then "'#{value.strftime("%Y-%m-%d %H:%M:%S")}'"
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else "'#{quote_string(value.to_yaml)}'"
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end
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end
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def quote_column(type, value)
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case type
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when :boolean
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case value
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when String then value =~ /^[ty]/o ? 1 : 0
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when true then 1
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when false then 0
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else value.to_i
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end
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when :integer then value.to_i
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when :float then value.to_f
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when :text, :string, :enum
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case value
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when String, Symbol, Fixnum, Float, Bignum, TrueClass, FalseClass
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"'#{quote_string(value.to_s)}'"
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else
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"'#{quote_string(value.to_yaml)}'"
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end
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when :date, :datetime, :time
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case value
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when Time, DateTime then "'#{value.strftime("%Y-%m-%d %H:%M:%S")}'"
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when Date then "'#{value.to_s}'"
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else "'#{quote_string(value)}'"
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end
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else "'#{quote_string(value.to_yaml)}'"
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end
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end
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def quote_string(s)
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s.gsub(/'/, "''") # ' (for ruby-mode)
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end
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def quote_column_name(name)
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"[#{name}]"
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end
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def add_limit_offset!(sql, options) # :nodoc:
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@limit = options[:limit]
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@offset = options[:offset]
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if !normal_select?
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# Use temp table to hack offset with Sybase
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sql.sub!(/ FROM /i, ' INTO #artemp FROM ')
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elsif zero_limit?
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# "SET ROWCOUNT 0" turns off limits, so we have
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# to use a cheap trick.
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if sql =~ /WHERE/i
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sql.sub!(/WHERE/i, 'WHERE 1 = 2 AND ')
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elsif sql =~ /ORDER\s+BY/i
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sql.sub!(/ORDER\s+BY/i, 'WHERE 1 = 2 ORDER BY')
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else
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sql << 'WHERE 1 = 2'
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end
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end
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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 rename_table(name, new_name)
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execute "EXEC sp_rename '#{name}', '#{new_name}'"
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end
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def rename_column(table, column, new_column_name)
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execute "EXEC sp_rename '#{table}.#{column}', '#{new_column_name}'"
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end
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def change_column(table_name, column_name, type, options = {}) #:nodoc:
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sql_commands = ["ALTER TABLE #{table_name} MODIFY #{column_name} #{type_to_sql(type, options[:limit])}"]
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if options[:default]
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remove_default_constraint(table_name, column_name)
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sql_commands << "ALTER TABLE #{table_name} ADD CONSTRAINT DF_#{table_name}_#{column_name} DEFAULT #{options[:default]} FOR #{column_name}"
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end
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sql_commands.each { |c| execute(c) }
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end
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def remove_column(table_name, column_name)
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remove_default_constraint(table_name, column_name)
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execute "ALTER TABLE #{table_name} DROP #{column_name}"
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end
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def remove_default_constraint(table_name, column_name)
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defaults = select "select def.name from sysobjects def, syscolumns col, sysobjects tab where col.cdefault = def.id and col.name = '#{column_name}' and tab.name = '#{table_name}' and col.id = tab.id"
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defaults.each {|constraint|
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execute "ALTER TABLE #{table_name} DROP CONSTRAINT #{constraint["name"]}"
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}
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end
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def remove_index(table_name, options = {})
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execute "DROP INDEX #{table_name}.#{index_name(table_name, options)}"
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end
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def add_column_options!(sql, options) #:nodoc:
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sql << " DEFAULT #{quote(options[:default], options[:column])}" unless options[:default].nil?
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if check_null_for_column?(options[:column], sql)
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sql << (options[:null] == false ? " NOT NULL" : " NULL")
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end
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sql
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end
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private
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def check_null_for_column?(col, sql)
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# Sybase columns are NOT NULL by default, so explicitly set NULL
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# if :null option is omitted. Disallow NULLs for boolean.
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type = col.nil? ? "" : col[:type]
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# Ignore :null if a primary key
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return false if type =~ /PRIMARY KEY/i
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# Ignore :null if a :boolean or BIT column
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if (sql =~ /\s+bit(\s+DEFAULT)?/i) || type == :boolean
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# If no default clause found on a boolean column, add one.
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sql << " DEFAULT 0" if $1.nil?
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return false
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end
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true
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end
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# Return the last value of the identity global value.
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def last_insert_id
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@connection.sql("SELECT @@IDENTITY")
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unless @connection.cmd_fail?
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id = @connection.top_row_result.rows.first.first
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if id
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id = id.to_i
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id = nil if id == 0
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end
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else
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id = nil
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end
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id
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end
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def affected_rows(name = nil)
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@connection.sql("SELECT @@ROWCOUNT")
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unless @connection.cmd_fail?
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count = @connection.top_row_result.rows.first.first
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count = count.to_i if count
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else
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0
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end
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end
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def normal_select?
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# If limit is not set at all, we can ignore offset;
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# If limit *is* set but offset is zero, use normal select
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# with simple SET ROWCOUNT. Thus, only use the temp table
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# if limit is set and offset > 0.
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has_limit = !@limit.nil?
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has_offset = !@offset.nil? && @offset > 0
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!has_limit || !has_offset
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end
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def zero_limit?
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!@limit.nil? && @limit == 0
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end
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# Select limit number of rows starting at optional offset.
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def select(sql, name = nil)
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@connection.context.reset
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log(sql, name) do
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if normal_select?
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# If limit is not explicitly set, return all results.
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@logger.debug "Setting row count to (#{@limit || 'off'})" if @logger
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# Run a normal select
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@connection.set_rowcount(@limit || 0)
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@connection.sql(sql)
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else
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# Select into a temp table and prune results
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@logger.debug "Selecting #{@limit + (@offset || 0)} or fewer rows into #artemp" if @logger
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@connection.set_rowcount(@limit + (@offset || 0))
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@connection.sql_norow(sql) # Select into temp table
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@logger.debug "Deleting #{@offset || 0} or fewer rows from #artemp" if @logger
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@connection.set_rowcount(@offset || 0)
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@connection.sql_norow("delete from #artemp") # Delete leading rows
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@connection.set_rowcount(0)
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@connection.sql("select * from #artemp") # Return the rest
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end
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end
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rows = []
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if @connection.context.failed? or @connection.cmd_fail?
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raise StatementInvalid, "SQL Command Failed for #{name}: #{sql}\nMessage: #{@connection.context.message}"
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else
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results = @connection.top_row_result
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if results && results.rows.length > 0
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fields = fixup_column_names(results.columns)
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results.rows.each do |row|
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hashed_row = {}
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row.zip(fields) { |cell, column| hashed_row[column] = cell }
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rows << hashed_row
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end
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end
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end
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@connection.sql_norow("drop table #artemp") if !normal_select?
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@limit = @offset = nil
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return rows
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end
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def enable_identity_insert(table_name, enable = true)
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if has_identity_column(table_name)
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"SET IDENTITY_INSERT #{table_name} #{enable ? 'ON' : 'OFF'}"
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end
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end
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def get_table_name(sql)
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if sql =~ /^\s*insert\s+into\s+([^\(\s]+)\s*|^\s*update\s+([^\(\s]+)\s*/i
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$1
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elsif sql =~ /from\s+([^\(\s]+)\s*/i
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$1
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else
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nil
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end
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end
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def has_identity_column(table_name)
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!get_identity_column(table_name).nil?
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end
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def get_identity_column(table_name)
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@table_columns = {} unless @table_columns
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@table_columns[table_name] = columns(table_name) if @table_columns[table_name] == nil
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@table_columns[table_name].each do |col|
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return col.name if col.identity
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end
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return nil
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end
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def query_contains_identity_column(sql, col)
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sql =~ /\[#{col}\]/
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end
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# Remove trailing _ from names.
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def fixup_column_names(columns)
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columns.map { |column| column.sub(/_$/, '') }
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end
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def table_structure(table_name)
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sql = <<SQLTEXT
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SELECT col.name AS name, type.name AS type, col.prec, col.scale, col.length,
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|
col.status, obj.sysstat2, def.text
|
|
FROM sysobjects obj, syscolumns col, systypes type, syscomments def
|
|
WHERE obj.id = col.id AND col.usertype = type.usertype AND col.cdefault *= def.id
|
|
AND obj.type = 'U' AND obj.name = '#{table_name}' ORDER BY col.colid
|
|
SQLTEXT
|
|
log(sql, "Get Column Info ") do
|
|
@connection.set_rowcount(0)
|
|
@connection.sql(sql)
|
|
end
|
|
if @connection.context.failed?
|
|
raise "SQL Command for table_structure for #{table_name} failed\nMessage: #{@connection.context.message}"
|
|
elsif !@connection.cmd_fail?
|
|
columns = []
|
|
results = @connection.top_row_result
|
|
results.rows.each do |row|
|
|
name, type, prec, scale, length, status, sysstat2, default = row
|
|
type = normalize_type(type, prec, scale, length)
|
|
default_value = nil
|
|
name.sub!(/_$/o, '')
|
|
if default =~ /DEFAULT\s+(.+)/o
|
|
default_value = $1.strip
|
|
default_value = default_value[1...-1] if default_value =~ /^['"]/o
|
|
end
|
|
nullable = (status & 8) == 8
|
|
identity = status >= 128
|
|
primary = (sysstat2 & 8) == 8
|
|
|
|
columns << [name, default_value, type, nullable, identity, primary]
|
|
end
|
|
columns
|
|
else
|
|
nil
|
|
end
|
|
end
|
|
|
|
def normalize_type(field_type, prec, scale, length)
|
|
if field_type =~ /numeric/i and (scale.nil? or scale == 0)
|
|
type = 'int'
|
|
elsif field_type =~ /money/i
|
|
type = 'numeric'
|
|
else
|
|
type = field_type
|
|
end
|
|
size = ''
|
|
if prec
|
|
size = "(#{prec})"
|
|
elsif length
|
|
size = "(#{length})"
|
|
end
|
|
return type + size
|
|
end
|
|
|
|
def default_value(value)
|
|
end
|
|
end # class SybaseAdapter
|
|
|
|
class SybaseAdapterContext < SybSQLContext
|
|
DEADLOCK = 1205
|
|
attr_reader :message
|
|
|
|
def init(logger = nil)
|
|
@deadlocked = false
|
|
@failed = false
|
|
@logger = logger
|
|
@message = nil
|
|
end
|
|
|
|
def srvmsgCB(con, msg)
|
|
# Do not log change of context messages.
|
|
if msg['severity'] == 10 or msg['severity'] == 0
|
|
return true
|
|
end
|
|
|
|
if msg['msgnumber'] == DEADLOCK
|
|
@deadlocked = true
|
|
else
|
|
@logger.info "SQL Command failed!" if @logger
|
|
@failed = true
|
|
end
|
|
|
|
if @logger
|
|
@logger.error "** SybSQLContext Server Message: **"
|
|
@logger.error " Message number #{msg['msgnumber']} Severity #{msg['severity']} State #{msg['state']} Line #{msg['line']}"
|
|
@logger.error " Server #{msg['srvname']}"
|
|
@logger.error " Procedure #{msg['proc']}"
|
|
@logger.error " Message String: #{msg['text']}"
|
|
end
|
|
|
|
@message = msg['text']
|
|
|
|
true
|
|
end
|
|
|
|
def deadlocked?
|
|
@deadlocked
|
|
end
|
|
|
|
def failed?
|
|
@failed
|
|
end
|
|
|
|
def reset
|
|
@deadlocked = false
|
|
@failed = false
|
|
@message = nil
|
|
end
|
|
|
|
def cltmsgCB(con, msg)
|
|
return true unless ( msg.kind_of?(Hash) )
|
|
unless ( msg[ "severity" ] ) then
|
|
return true
|
|
end
|
|
|
|
if @logger
|
|
@logger.error "** SybSQLContext Client-Message: **"
|
|
@logger.error " Message number: LAYER=#{msg[ 'layer' ]} ORIGIN=#{msg[ 'origin' ]} SEVERITY=#{msg[ 'severity' ]} NUMBER=#{msg[ 'number' ]}"
|
|
@logger.error " Message String: #{msg['msgstring']}"
|
|
@logger.error " OS Error: #{msg['osstring']}"
|
|
|
|
@message = msg['msgstring']
|
|
end
|
|
|
|
@failed = true
|
|
|
|
# Not retry , CS_CV_RETRY_FAIL( probability TimeOut )
|
|
if( msg[ 'severity' ] == "RETRY_FAIL" ) then
|
|
@timeout_p = true
|
|
return false
|
|
end
|
|
|
|
return true
|
|
end
|
|
end # class SybaseAdapterContext
|
|
|
|
end # module ConnectionAdapters
|
|
end # module ActiveRecord
|
|
|
|
|
|
# Allow identity inserts for fixtures.
|
|
require "active_record/fixtures"
|
|
class Fixtures
|
|
alias :original_insert_fixtures :insert_fixtures
|
|
|
|
def insert_fixtures
|
|
values.each do |fixture|
|
|
allow_identity_inserts table_name, true
|
|
@connection.execute "INSERT INTO #{@table_name} (#{fixture.key_list}) VALUES (#{fixture.value_list})", 'Fixture Insert'
|
|
allow_identity_inserts table_name, false
|
|
end
|
|
end
|
|
|
|
def allow_identity_inserts(table_name, enable)
|
|
@connection.execute "SET IDENTITY_INSERT #{table_name} #{enable ? 'ON' : 'OFF'}" rescue nil
|
|
end
|
|
end
|
|
|
|
rescue LoadError => cannot_require_sybase
|
|
# Couldn't load sybase adapter
|
|
end |