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Diffstat (limited to 'activerecord/lib/active_record/connection_adapters/sqlserver_adapter.rb')
| -rw-r--r-- | activerecord/lib/active_record/connection_adapters/sqlserver_adapter.rb | 298 |
1 files changed, 298 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/sqlserver_adapter.rb b/activerecord/lib/active_record/connection_adapters/sqlserver_adapter.rb new file mode 100644 index 0000000000..5cd5f5a0be --- /dev/null +++ b/activerecord/lib/active_record/connection_adapters/sqlserver_adapter.rb @@ -0,0 +1,298 @@ +require 'active_record/connection_adapters/abstract_adapter' + +# sqlserver_adapter.rb -- ActiveRecord adapter for Microsoft SQL Server +# +# Author: Joey Gibson <joey@joeygibson.com> +# Date: 10/14/2004 +# +# REQUIREMENTS: +# +# This adapter will ONLY work on Windows systems, since it relies on Win32OLE, which, +# to my knowledge, is only available on Window. +# +# It relies on the ADO support in the DBI module. If you are using the +# one-click installer of Ruby, then you already have DBI installed, but +# the ADO module is *NOT* installed. You will need to get the latest +# source distribution of Ruby-DBI from http://ruby-dbi.sourceforge.net/ +# unzip it, and copy the file src/lib/dbd_ado/ADO.rb to +# X:/Ruby/lib/ruby/site_ruby/1.8/DBD/ADO/ADO.rb (you will need to create +# the ADO directory). Once you've installed that file, you are ready to go. +# +# This module uses the ADO-style DSNs for connection. For example: +# "DBI:ADO:Provider=SQLOLEDB;Data Source=(local);Initial Catalog=test;User Id=sa;Password=password;" +# with User Id replaced with your proper login, and Password with your +# password. +# +# I have tested this code on a WindowsXP Pro SP1 system, +# ruby 1.8.2 (2004-07-29) [i386-mswin32], SQL Server 2000. +# +module ActiveRecord + class Base + def self.sqlserver_connection(config) + require_library_or_gem 'dbi' unless self.class.const_defined?(:DBI) + class_eval { include ActiveRecord::SQLServerBaseExtensions } + + symbolize_strings_in_hash(config) + + if config.has_key? :dsn + dsn = config[:dsn] + else + raise ArgumentError, "No DSN specified" + end + + conn = DBI.connect(dsn) + conn["AutoCommit"] = true + + ConnectionAdapters::SQLServerAdapter.new(conn, logger) + end + end + + module SQLServerBaseExtensions #:nodoc: + def self.append_features(base) + super + base.extend(ClassMethods) + end + + module ClassMethods + def find_first(conditions = nil, orderings = nil) + sql = "SELECT TOP 1 * FROM #{table_name} " + add_conditions!(sql, conditions) + sql << "ORDER BY #{orderings} " unless orderings.nil? + + record = connection.select_one(sql, "#{name} Load First") + instantiate(record) unless record.nil? + end + + def find_all(conditions = nil, orderings = nil, limit = nil, joins = nil) + sql = "SELECT " + sql << "TOP #{limit} " unless limit.nil? + sql << " * FROM #{table_name} " + sql << "#{joins} " if joins + add_conditions!(sql, conditions) + sql << "ORDER BY #{orderings} " unless orderings.nil? + + find_by_sql(sql) + end + end + + def attributes_with_quotes + columns_hash = self.class.columns_hash + + attrs = @attributes.dup + + attrs = attrs.reject do |name, value| + columns_hash[name].identity + end + + attrs.inject({}) do |attrs_quoted, pair| + attrs_quoted[pair.first] = quote(pair.last, columns_hash[pair.first]) + attrs_quoted + end + end + end + + module ConnectionAdapters + class ColumnWithIdentity < Column + attr_reader :identity + + def initialize(name, default, sql_type = nil, is_identity = false) + super(name, default, sql_type) + + @identity = is_identity + end + end + + class SQLServerAdapter < AbstractAdapter # :nodoc: + def quote_column_name(name) + " [#{name}] " + end + + def select_all(sql, name = nil) + select(sql, name) + end + + def select_one(sql, name = nil) + result = select(sql, name) + result.nil? ? nil : result.first + end + + def columns(table_name, name = nil) + sql = <<EOL +SELECT s.name AS TableName, c.id AS ColId, c.name AS ColName, t.name AS ColType, c.length AS Length, +c.AutoVal AS IsIdentity, +c.cdefault AS DefaultId, com.text AS DefaultValue +FROM syscolumns AS c +JOIN systypes AS t ON (c.xtype = t.xtype AND c.usertype = t.usertype) +JOIN sysobjects AS s ON (c.id = s.id) +LEFT OUTER JOIN syscomments AS com ON (c.cdefault = com.id) +WHERE s.name = '#{table_name}' +EOL + + columns = [] + + log(sql, name, @connection) do |conn| + conn.select_all(sql) do |row| + default_value = row[:DefaultValue] + + if default_value =~ /null/i + default_value = nil + else + default_value =~ /\(([^)]+)\)/ + default_value = $1 + end + + col = ColumnWithIdentity.new(row[:ColName], default_value, "#{row[:ColType]}(#{row[:Length]})", row[:IsIdentity] != nil) + + columns << col + end + end + + columns + end + + def insert(sql, name = nil, pk = nil, id_value = nil) + begin + table_name = get_table_name(sql) + + col = get_identity_column(table_name) + + ii_enabled = false + + if col != nil + if query_contains_identity_column(sql, col) + begin + execute enable_identity_insert(table_name, true) + ii_enabled = true + rescue Exception => e + # Coulnd't turn on IDENTITY_INSERT + end + end + end + + log(sql, name, @connection) do |conn| + conn.execute(sql) + + select_one("SELECT @@IDENTITY AS Ident")["Ident"] + end + ensure + if ii_enabled + begin + execute enable_identity_insert(table_name, false) + + rescue Exception => e + # Couldn't turn off IDENTITY_INSERT + end + end + end + end + + def execute(sql, name = nil) + if sql =~ /^INSERT/i + insert(sql, name) + else + log(sql, name, @connection) do |conn| + conn.execute(sql) + end + end + end + + alias_method :update, :execute + alias_method :delete, :execute + + def begin_db_transaction + begin + @connection["AutoCommit"] = false + rescue Exception => e + @connection["AutoCommit"] = true + end + end + + def commit_db_transaction + begin + @connection.commit + ensure + @connection["AutoCommit"] = true + end + end + + def rollback_db_transaction + begin + @connection.rollback + ensure + @connection["AutoCommit"] = true + end + end + + def recreate_database(name) + drop_database(name) + create_database(name) + end + + def drop_database(name) + execute "DROP DATABASE #{name}" + end + + def create_database(name) + execute "CREATE DATABASE #{name}" + end + + private + def select(sql, name = nil) + rows = [] + + log(sql, name, @connection) do |conn| + conn.select_all(sql) do |row| + record = {} + + row.column_names.each do |col| + record[col] = row[col] + end + + rows << record + end + end + + rows + end + + def enable_identity_insert(table_name, enable = true) + if has_identity_column(table_name) + "SET IDENTITY_INSERT #{table_name} #{enable ? 'ON' : 'OFF'}" + end + end + + def get_table_name(sql) + if sql =~ /into\s*([^\s]+)\s*/i or + sql =~ /update\s*([^\s]+)\s*/i + $1 + else + nil + end + end + + def has_identity_column(table_name) + return get_identity_column(table_name) != nil + end + + def get_identity_column(table_name) + if not @table_columns + @table_columns = {} + end + + if @table_columns[table_name] == nil + @table_columns[table_name] = columns(table_name) + end + + @table_columns[table_name].each do |col| + return col.name if col.identity + end + + return nil + end + + def query_contains_identity_column(sql, col) + return sql =~ /[\(\.\,]\s*#{col}/ + end + end + end +end
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