Class: ActiveRecord::Base

Inherits:
Object
  • Object
show all
Defined in:
lib/active_record/connection_adapters/ibm_db_pstmt.rb,
lib/active_record/connection_adapters/ibm_db_adapter.rb

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.add_conditions!(sql, conditions, scope = :auto) ⇒ Object

Adds a sanitized version of conditions to the sql string. Note that the passed-in sql string is changed. The optional scope argument is for the current :find scope.



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# File 'lib/active_record/connection_adapters/ibm_db_pstmt.rb', line 575

def add_conditions!(sql, conditions, scope = :auto)
  scope = scope(:find) if :auto == scope
  conditions = [conditions]
  conditions << scope[:conditions] if scope
  conditions << type_condition if finder_needs_type_condition?
  merged_conditions = merge_conditions(*conditions)
  sql << "WHERE #{merged_conditions["sqlSegment"]} " unless merged_conditions["sqlSegment"].blank?
  merged_conditions["paramArray"]
end

.add_group!(sql, group, having, scope = :auto) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_pstmt.rb', line 343

def add_group!(sql, group, having, scope = :auto)
  param_array = []
  if group
    sql << " GROUP BY #{group}"
    if having
      sql_param_hash = sanitize_sql_for_conditions(having)
      sql << " HAVING #{sql_param_hash["sqlSegment"]}"
      param_array = param_array + sql_param_hash["paramArray"] unless sql_param_hash["paramArray"].nil?
    end
  else
    scope = scope(:find) if :auto == scope
    if scope && (scoped_group = scope[:group])
      sql << " GROUP BY #{scoped_group}"
      if scope[:having]
        sql_param_hash = sanitize_sql_for_conditions(scope[:having])
        sql << " HAVING #{sql_param_hash["sqlSegment"]}"
        param_array = param_array + sql_param_hash["paramArray"] unless sql_param_hash["paramArray"].nil?
      end
    end
  end
  param_array
end

.add_joins!(sql, joins, scope = :auto) ⇒ Object

The optional scope argument is for the current :find scope.



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# File 'lib/active_record/connection_adapters/ibm_db_pstmt.rb', line 367

def add_joins!(sql, joins, scope = :auto)
  param_array = []
  scope = scope(:find) if :auto == scope

  if joins.is_a?(Hash) && joins.has_key?("pstmt_hook")
    param_array = joins["pstmt_hook"]["paramArray"]
    joins = joins["pstmt_hook"]["sqlSegment"]
  end

  merged_joins = if scope && scope[:joins] && joins 
                   join_merge_hash = merge_joins(scope[:joins], joins)
                   param_array = param_array + join_merge_hash["pstmt_hook"]["paramArray"]
                   join_merge_hash["pstmt_hook"]["sqlSegment"]
                 else
                   if(scope && scope[:joins].is_a?(Hash) && scope[:joins].has_key?("pstmt_hook"))
                     param_array = scope[:joins]["pstmt_hook"]["paramArray"]
                     (joins || scope[:joins]["pstmt_hook"]["sqlSegment"])
                   else
                     (joins || scope && scope[:joins])
                   end
                 end

  case merged_joins
  when Symbol, Hash, Array
    if array_of_strings?(merged_joins)
      sql << merged_joins.join(' ') + " "
    else
      join_dependency = ActiveRecord::Associations::ClassMethods::InnerJoinDependency.new(self, merged_joins, nil)
      sql << " #{join_dependency.join_associations.collect { |assoc| 
                    sql_param_hash = assoc.association_join 
                    param_array = param_array + sql_param_hash["paramArray"] unless sql_param_hash["paramArray"].nil?
                    sql_param_hash["sqlSegment"]
                  }.join} "
    end
  when String
    sql << " #{merged_joins} "
  end
  param_array
end

.attribute_condition(quoted_column_name, argument) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_pstmt.rb', line 598

def attribute_condition(quoted_column_name, argument)
  case argument
    when nil   then "#{quoted_column_name} IS NULL"
    when Array, ActiveRecord::Associations::AssociationCollection, ActiveRecord::NamedScope::Scope then "#{quoted_column_name} IN (?)"
    when Range then if argument.exclude_end?
                      "#{quoted_column_name} >= ? AND #{quoted_column_name} < ?"
                    else
                      "#{quoted_column_name} BETWEEN ? AND ?"
                    end
    else            "#{quoted_column_name} = ?"
  end
end

.construct_finder_sql(options) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_pstmt.rb', line 318

def construct_finder_sql(options)
  param_array = []
  scope = scope(:find)
  sql  = "SELECT #{options[:select] || (scope && scope[:select]) || default_select(options[:joins] || (scope && scope[:joins]))} "
  sql << "FROM #{options[:from]  || (scope && scope[:from]) || quoted_table_name} "

  param_array = add_joins!(sql, options[:joins], scope)

  param_array = param_array + add_conditions!(sql, options[:conditions], scope)

  param_array = param_array + add_group!(sql, options[:group], options[:having], scope)

  add_order!(sql, options[:order], scope)

  temp_options = options.dup # Ensure that the necessary parameters are received in the duplicate, so that the original hash is intact
  temp_options[:paramArray] = [] # To receive the values for limit and offset.
  add_limit!(sql, temp_options, scope)

  param_array = param_array + temp_options[:paramArray]

  add_lock!(sql, options, scope)

  [sql] + param_array
end

.count_by_sql(sql) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_pstmt.rb', line 471

def count_by_sql(sql)
  sql_param_hash = sanitize_conditions(sql)
  result = connection.prepared_select(sql_param_hash, "#{name} Count").first
  #result will be of type Hash.
  if result
    return result.values.first.to_i  #Retrieve the first value from hash
  else
    return 0
  end
end

.delete_all(conditions = nil) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_pstmt.rb', line 542

def delete_all(conditions = nil)
  sql = "DELETE FROM #{quoted_table_name} "
  param_array = add_conditions!(sql, conditions, scope(:find))
  # Prepare the sql for deleting the rows
  pstmt = connection.prepare(sql, "#{name} Delete all")
  # Execute the prepared Statement
  connection.prepared_delete(pstmt, param_array)
end

.expand_id_conditions(id_or_conditions) ⇒ Object

Interpret Array and Hash as conditions and anything else as an id.



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# File 'lib/active_record/connection_adapters/ibm_db_pstmt.rb', line 311

def expand_id_conditions(id_or_conditions)
  case id_or_conditions
    when Array, Hash then id_or_conditions
    else {primary_key => id_or_conditions}
  end
end

.find_by_sql(sql) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_pstmt.rb', line 305

def find_by_sql(sql)
  sql_param_hash = sanitize_sql(sql)
  connection.prepared_select(sql_param_hash, "#{name} Load").collect! { |record| instantiate(record) }
end

.find_one(id, options) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_pstmt.rb', line 192

def find_one(id, options)
  param_array = [quote_value(id,columns_hash[primary_key])]
  if options[:conditions]
    sql_param_hash = sanitize_sql(options[:conditions])
    conditions = " AND (#{sql_param_hash["sqlSegment"]})"
    param_array = param_array + sql_param_hash["paramArray"] unless sql_param_hash["paramArray"].nil?
  end

  options.update :conditions => ["#{quoted_table_name}.#{connection.quote_column_name(primary_key)} = ?#{conditions}"] + param_array

  # Use find_every(options).first since the primary key condition
  # already ensures we have a single record. Using find_initial adds
  # a superfluous :limit => 1.
  if result = find_every(options).first
    result
  else
    raise RecordNotFound, "Couldn't find #{name} with ID=#{id}#{conditions} with parameters #{param_array.last(param_array.size-1)}"
  end
end

.find_some(ids, options) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_pstmt.rb', line 212

def find_some(ids, options)
  param_array = []
  ids_array = ids.map { |id| quote_value(id,columns_hash[primary_key]) }
  if options[:conditions]
    sql_param_hash = sanitize_sql(options[:conditions])
    conditions = " AND (#{sql_param_hash["sqlSegment"]})"
    param_array = param_array + sql_param_hash["paramArray"] unless sql_param_hash["paramArray"].nil?
  end

  options.update :conditions => ["#{quoted_table_name}.#{connection.quote_column_name(primary_key)} IN (?)#{conditions}"] + [ids_array] + param_array

  result = find_every(options)

  # Determine expected size from limit and offset, not just ids.size.
  expected_size =
    if options[:limit] && ids.size > options[:limit]
      options[:limit]
    else
      ids.size
    end

  # 11 ids with limit 3, offset 9 should give 2 results.
  if options[:offset] && (ids.size - options[:offset] < expected_size)
    expected_size = ids.size - options[:offset]
  end

  if result.size == expected_size
    result
  else
    raise RecordNotFound, "Couldn't find all #{name.pluralize} with IDs (#{ids.join(', ')})#{conditions} with parameter(s) #{param_array.join(', ')} (found #{result.size} results, but was looking for #{expected_size})"
  end
end

.ibm_db_connection(config) ⇒ Object

Establishes a connection to a specified database using the credentials provided with the config argument. All the ActiveRecord objects will use this connection



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 101

def self.ibm_db_connection(config)
  # Attempts to load the Ruby driver IBM databases
  # while not already loaded or raises LoadError in case of failure.
  begin
    require 'ibm_db' unless defined? IBM_DB
  rescue LoadError
    raise LoadError, "Failed to load IBM_DB Ruby driver."
  end

  if( config.has_key?(:parameterized) && config[:parameterized] == true )
    require 'active_record/connection_adapters/ibm_db_pstmt'
  end

  # Converts all +config+ keys to symbols
  config = config.symbolize_keys

  # Flag to decide if quoted literal replcement should take place. By default it is ON. Set it to OFF if using Pstmt
  set_quoted_literal_replacement = IBM_DB::QUOTED_LITERAL_REPLACEMENT_ON

  # Retrieves the database alias (local catalog name) or remote name
  # (for remote TCP/IP connections) from the +config+ hash
  # or raises ArgumentError in case of failure.
  if config.has_key?(:database)
    database = config[:database].to_s
  else
    raise ArgumentError, "Missing argument: a database name needs to be specified."
  end

  # Retrieves database user credentials from the +config+ hash
  # or raises ArgumentError in case of failure.
  if !config.has_key?(:username) || !config.has_key?(:password)
    raise ArgumentError, "Missing argument(s): Username/Password for #{config[:database]} is not specified"
  else
    username = config[:username].to_s
    password = config[:password].to_s
  end

  # Providing default schema (username) when not specified
  config[:schema] = config.has_key?(:schema) ? config[:schema].to_s : config[:username].to_s

  if(config.has_key?(:parameterized) && config[:parameterized] == true )
    set_quoted_literal_replacement = IBM_DB::QUOTED_LITERAL_REPLACEMENT_OFF
  end

  # Extract connection options from the database configuration
  # (in support to formatting, audit and billing purposes):
  # Retrieve database objects fields in lowercase
  conn_options = {IBM_DB::ATTR_CASE => IBM_DB::CASE_LOWER}
  config.each do |key, value|
    if !value.nil?
      case key
        when :app_user        # Set connection's user info
          conn_options[IBM_DB::SQL_ATTR_INFO_USERID]     = value
        when :account         # Set connection's account info
          conn_options[IBM_DB::SQL_ATTR_INFO_ACCTSTR]    = value
        when :application     # Set connection's application info
          conn_options[IBM_DB::SQL_ATTR_INFO_APPLNAME]   = value
        when :workstation     # Set connection's workstation info
          conn_options[IBM_DB::SQL_ATTR_INFO_WRKSTNNAME] = value
      end    
    end
  end

  begin
    # Checks if a host name or address has been specified. If so, this implies a TCP/IP connection
    # Returns IBM_DB.Connection object upon succesful DB connection to the database
    # If otherwise the connection fails, +false+ is returned
    if config.has_key?(:host)
      # Retrieves the host address/name
      host = config[:host]
      # A net address connection requires a port. If no port has been specified, 50000 is used by default
      port = config[:port] || 50000
      # Connects to the database specified using the hostname, port, authentication type, username and password info
      # Starting with DB2 9.1FP5 secure connections using SSL are supported. 
      # On the client side using CLI this is supported from CLI version V95FP2 and onwards.
      # This feature is set by specifying SECURITY=SSL in the connection string.
      # Below connection string is constructed and SECURITY parameter is appended if the user has specified the :security option
      conn_string = "DRIVER={IBM DB2 ODBC DRIVER};\
                     DATABASE=#{database};\
                     HOSTNAME=#{host};\
                     PORT=#{port};\
                     PROTOCOL=TCPIP;\
                     UID=#{username};\
                     PWD=#{password};"
      conn_string << "SECURITY=#{config[:security]};" if config.has_key?(:security)
      conn_string << "AUTHENTICATION=#{config[:authentication]};" if config.has_key?(:authentication)
      conn_string << "CONNECTTIMEOUT=#{config[:timeout]};" if config.has_key?(:timeout)
    
      connection = IBM_DB.connect( conn_string, '', '', conn_options, set_quoted_literal_replacement )
    else
      # No host implies a local catalog-based connection: +database+ represents catalog alias
      connection = IBM_DB.connect( database, username, password, conn_options,  set_quoted_literal_replacement )
    end
  rescue StandardError => connect_err
    raise "Failed to connect to [#{database}] due to: #{connect_err}"
  end
  # Verifies that the connection was successful
  if connection
    # Creates an instance of *IBM_DBAdapter* based on the +connection+
    # and credentials provided in +config+
    ConnectionAdapters::IBM_DBAdapter.new(connection, logger, config, conn_options)
  else
    # If the connection failure was not caught previoulsy, it raises a Runtime error
    raise "An unexpected error occured during connect attempt to [#{database}]"
  end
end

.merge_conditions(*conditions) ⇒ Object

Merges conditions so that the result is a valid condition



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# File 'lib/active_record/connection_adapters/ibm_db_pstmt.rb', line 552

def merge_conditions(*conditions)
  segments = []
  return_hash = {}
  return_hash["paramArray"] = []
  conditions.each do |condition|
    unless condition.blank?
      sql_param_hash = sanitize_sql(condition)
      unless sql_param_hash["sqlSegment"].blank?
        segments << sql_param_hash["sqlSegment"]
        if !sql_param_hash["paramArray"].nil? && !sql_param_hash["paramArray"].empty?
          return_hash["paramArray"] = return_hash["paramArray"] + 
                                      sql_param_hash["paramArray"]
        end
      end
    end
  end

  return_hash["sqlSegment"] = "(#{segments.join(') AND (')})" unless segments.empty?
  return_hash
end

.merge_joins(*joins) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_pstmt.rb', line 245

def merge_joins(*joins)
  sql_param_hash = {}
  param_array = []
  if joins.any?{|j| j.is_a?(String) || array_of_strings?(j) || (j.is_a?(Hash) && j.has_key?("pstmt_hook"))}
    joins_array = []
    joins_compare_array = []

    joins.each do |join|
      get_join_associations = true
      if join.is_a?(String)
        unless joins_compare_array.include?(join)
          joins_array << join
          joins_compare_array << join
        end
        get_join_associations = false
      elsif (join.is_a?(Hash) && join.has_key?("pstmt_hook"))
        if(join["pstmt_hook"]["sqlSegment"].is_a?(Array))
          compare_string = join["pstmt_hook"]["sqlSegment"].join(" ") + join["pstmt_hook"]["paramArray"].join(" ")
        else
          compare_string = join["pstmt_hook"]["sqlSegment"] + join["pstmt_hook"]["paramArray"].join(" ")
        end
        unless joins_compare_array.include?(compare_string)
          param_array = param_array + join["pstmt_hook"]["paramArray"] unless join["pstmt_hook"]["paramArray"].nil?
          joins_array << join["pstmt_hook"]["sqlSegment"]
          joins_compare_array << compare_string
        end
        get_join_associations = false
      end
      unless array_of_strings?(join)
        if get_join_associations
          join_dependency = ActiveRecord::Associations::ClassMethods::InnerJoinDependency.new(self, join, nil)
          join_dependency.join_associations.each do |assoc| 
            sql_param_hash = assoc.association_join
            compare_string = nil
            compare_string = sql_param_hash["sqlSegment"] + sql_param_hash["paramArray"].join(" ") unless sql_param_hash.nil?
            unless compare_string.nil? || joins_array.include?(compare_string)
              param_array = param_array + sql_param_hash["paramArray"] unless sql_param_hash["paramArray"].nil?
              joins_array << sql_param_hash["sqlSegment"]
              joins_compare_array << compare_string
            end
          end
        end
      else
        if get_join_associations
          joins_array = joins_array + join.flatten.map{|j| j.strip }.uniq
        end
      end
    end
    sql_param_hash["sqlSegment"] = joins_array.flatten.map{|j| j.strip }.uniq
    sql_param_hash["paramArray"] = param_array
    {"pstmt_hook" => sql_param_hash}
  else
    sql_param_hash["sqlSegment"] = joins.collect{|j| safe_to_array(j)}.flatten.uniq
    sql_param_hash["paramArray"] = param_array
    {"pstmt_hook" => sql_param_hash}
  end
end

.quote_bound_value(value) ⇒ Object

Returns an array of parameter values, with the values respectively quoted if of type date time or is nil



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# File 'lib/active_record/connection_adapters/ibm_db_pstmt.rb', line 769

def quote_bound_value(value) #:nodoc:
  if value.respond_to?(:map) && !value.acts_like?(:string)
    if (value.respond_to?(:empty?) && value.empty?) || value.nil?
      [nil]
    else
      value.map { |v| 
          connection.quote_value_for_pstmt(v)
      }
    end
  else
    [connection.quote_value_for_pstmt(value)]
  end
end

.quote_value(value, column = nil) ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/ibm_db_pstmt.rb', line 482

def quote_value(value, column = nil) #:nodoc:
  connection.quote_value_for_pstmt(value,column)
end

.replace_bind_variables(statement, values) ⇒ Object

Check delete_all method, which passes a ? and array of params, as an example. This method replace_bind_variables replaces those ? with a string of the values. For Eg:- if said Wood.delete(), delete all sends the condition as [“id in (?)”, [1,2,3,4]] This method sends the condition part back as string, “id in (1,2,3,4)” originally Now this method is modified to send out a hash containing the parameter array and the sql to be prepared



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# File 'lib/active_record/connection_adapters/ibm_db_pstmt.rb', line 716

def replace_bind_variables(statement, values)
  raise_if_bind_arity_mismatch(statement, statement.count('?'), values.size)
  bound = values.dup
  return_hash = {}
  return_hash["paramArray"] = []
  return_hash["sqlSegment"] = ''

  return_hash["sqlSegment"] = 
     statement.gsub('?') {
        str_seg = ''
        param_array = quote_bound_value(bound.shift)
        if param_array && param_array.size > 1
          for index in 0...param_array.size-1
            str_seg << '?,'
          end
        end
        str_seg << '?'
        return_hash["paramArray"] = return_hash["paramArray"] + param_array unless param_array.nil?
        str_seg
      }
  return_hash
end

.replace_named_bind_variables(statement, bind_vars) ⇒ Object

Replaces the named parameters with ‘?’ and pass a hash containing the sql’s condition clause segment and the parameters array



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# File 'lib/active_record/connection_adapters/ibm_db_pstmt.rb', line 740

def replace_named_bind_variables(statement, bind_vars) #:nodoc:
  return_hash = {}
  return_hash["paramArray"] = []
  return_hash["sqlSegment"] = ''

  return_hash["sqlSegment"] =
    statement.gsub(/(:?):([a-zA-Z]\w*)/) {

      if $1 == ':' # skip postgresql casts
        $& # return the whole match
      elsif bind_vars.include?(match = $2.to_sym)
        str_seg = ''
        param_array = quote_bound_value(bind_vars[match])
        if param_array.size > 1
          for index in 0...param_array.size-1
            str_seg << '?,'
          end
        end
        str_seg << '?'
        return_hash["paramArray"] = return_hash["paramArray"] + param_array
        str_seg
      else
        raise PreparedStatementInvalid, "missing value for :#{match} in #{statement}"
      end
    }
  return_hash
end

.sanitize_sql_array(ary) ⇒ Object

Accepts an array of conditions. The array has each value sanitized and interpolated into the SQL statement.



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# File 'lib/active_record/connection_adapters/ibm_db_pstmt.rb', line 661

def sanitize_sql_array(ary)
  statement, *values = ary
  return_hash = {}

  if values.first.is_a?(Hash) and statement =~ /:\w+/
    replace_named_bind_variables(statement, values.first)
  elsif statement && statement.include?('?')
    replace_bind_variables(statement, values)
  else
    if !values.nil? && values.size > 0
      return_hash["sqlSegment"] = statement % values.collect { |value| connection.quote_string(value.to_s) }
    else
      return_hash["sqlSegment"] = statement
    end
    return_hash["paramArray"] = []
    return_hash
  end
end

.sanitize_sql_for_assignment(assignments) ⇒ Object

Accepts an array, hash, or string of SQL conditions and sanitizes them into a valid SQL fragment for a SET clause.

{ :name => nil, :group_id => 4 }  returns "name = NULL , group_id='4'"



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# File 'lib/active_record/connection_adapters/ibm_db_pstmt.rb', line 630

def sanitize_sql_for_assignment(assignments)
  return_hash = {}
  case assignments
    when Array; sanitize_sql_array(assignments)
    when Hash;  sanitize_sql_hash_for_assignment(assignments)
    else        
      return_hash["sqlSegment"] = assignments
      return_hash["paramArray"] = nil
      return_hash
  end
end

.sanitize_sql_for_conditions(condition, table_name = quoted_table_name) ⇒ Object Also known as: sanitize_sql, sanitize_conditions 



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# File 'lib/active_record/connection_adapters/ibm_db_pstmt.rb', line 642

def sanitize_sql_for_conditions(condition, table_name = quoted_table_name)
  return nil if condition.blank?

  return_hash = {}

  case condition
    when Array; sanitize_sql_array(condition)
    when Hash;  sanitize_sql_hash_for_conditions(condition, table_name)
    else
      return_hash["sqlSegment"] = condition
      return_hash["paramArray"] = nil
      return_hash
  end
end

.sanitize_sql_hash_for_assignment(attrs) ⇒ Object

Sanitizes a hash of attribute/value pairs into SQL conditions for a SET clause.

{ :status => nil, :group_id => 1 }
  # => "status = NULL , group_id = 1"



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# File 'lib/active_record/connection_adapters/ibm_db_pstmt.rb', line 616

def sanitize_sql_hash_for_assignment(attrs)
  return_hash = {}
  return_hash["paramArray"] = []

  return_hash["sqlSegment"] = attrs.map do |attr, value|
    return_hash["paramArray"] += quote_bound_value(value)
    "#{connection.quote_column_name(attr)} = ?"
  end.join(', ')
  return_hash
end

.sanitize_sql_hash_for_conditions(attrs, table_name = quoted_table_name) ⇒ Object Also known as: sanitize_sql_hash 



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# File 'lib/active_record/connection_adapters/ibm_db_pstmt.rb', line 680

def sanitize_sql_hash_for_conditions(attrs, table_name = quoted_table_name)
  attrs = expand_hash_conditions_for_aggregates(attrs)
  temp_table_name = table_name

  param_array = []

  conditions = attrs.map do |attr, value|
    unless value.is_a?(Hash)
      attr = attr.to_s

      # Extract table name from qualified attribute names.
      if attr.include?('.')
        table_name, attr = attr.split('.', 2)
        table_name = connection.quote_table_name(table_name)
      else
        table_name = temp_table_name
      end

      param_array << value unless value.nil?
      attribute_condition("#{table_name}.#{connection.quote_column_name(attr)}", value)
    else
      sql_param_hash = sanitize_sql_hash_for_conditions(value, connection.quote_table_name(attr.to_s))
      param_array = param_array + sql_param_hash["paramArray"] unless sql_param_hash["paramArray"].empty?
      sql_param_hash["sqlSegment"]
    end
  end.join(' AND ')

  replace_bind_variables(conditions, expand_range_bind_variables(param_array))
end

.type_condition(table_alias = nil) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_pstmt.rb', line 585

def type_condition(table_alias=nil)
  param_array = []
  quoted_table_alias = self.connection.quote_table_name(table_alias || table_name)
  quoted_inheritance_column = connection.quote_column_name(inheritance_column)
  param_array << self.connection.quote_value_for_pstmt(sti_name)
  type_condition = subclasses.inject("#{quoted_table_alias}.#{quoted_inheritance_column} = ? ") do |condition, subclass|
    param_array << self.connection.quote_value_for_pstmt(subclass.sti_name)
    condition << "OR #{quoted_table_alias}.#{quoted_inheritance_column} = ? "
  end

  [" (#{type_condition}) "] + param_array
end

.update_all(updates, conditions = nil, options = {}) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_pstmt.rb', line 486

def update_all(updates, conditions = nil, options = {})
  sql_values_hash = sanitize_sql_for_assignment(updates)
  param_array = sql_values_hash["paramArray"]

  sql  = "UPDATE #{quoted_table_name} SET #{sql_values_hash["sqlSegment"]} "

  scope = scope(:find)

  select_sql = ""
  temp_param_array = add_conditions!(select_sql, conditions, scope)

  if !param_array.nil? && !param_array.empty?
    param_array += temp_param_array
  else
    param_array = temp_param_array
  end

  if options.has_key?(:limit) || (scope && scope[:limit])
    # Only take order from scope if limit is also provided by scope, this
    # is useful for updating a has_many association with a limit.
    add_order!(select_sql, options[:order], scope)

    temp_options = options.dup # Ensure that the necessary parameters are received in the duplicate, so that the original hash is intact
    temp_options[:paramArray] = [] # To receive the values for limit and offset.
    add_limit!(select_sql, temp_options, scope)
    param_array = param_array + temp_options[:paramArray]

    sql.concat(connection.limited_update_conditions(select_sql, quoted_table_name, connection.quote_column_name(primary_key)))
  else
    add_order!(select_sql, options[:order], nil)
    sql.concat(select_sql)
  end

  pstmt = connection.prepare(sql, "#{name} Update")
  connection.prepared_update(pstmt, param_array)
end

.update_counters_without_lock(id, counters) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_pstmt.rb', line 523

def update_counters_without_lock(id, counters)
  updates = counters.inject([]) { |list, (counter_name, increment)|
    sign = increment < 0 ? "-" : "+"
    list << "#{connection.quote_column_name(counter_name)} = COALESCE(#{connection.quote_column_name(counter_name)}, 0) #{sign} #{increment.abs}"
  }.join(", ")

  if id.is_a?(Array)
    ids_list = id.map {|i|
      connection.quote_value_for_pstmt(i)
    }
    condition = ["#{connection.quote_column_name(primary_key)} IN  (?)", ids_list]
  else
    param_value = connection.quote_value_for_pstmt(id)
    condition = ["#{connection.quote_column_name(primary_key)} = ?", param_value]
  end

  update_all(updates, condition)
end

.with_scope(method_scoping = {}, action = :merge, &block) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_pstmt.rb', line 408

def with_scope(method_scoping = {}, action = :merge, &block)
  method_scoping = method_scoping.method_scoping if method_scoping.respond_to?(:method_scoping)

  # Dup first and second level of hash (method and params).
  method_scoping = method_scoping.inject({}) do |hash, (method, params)|
    hash[method] = (params == true) ? params : params.dup
    hash
  end

  method_scoping.assert_valid_keys([ :find, :create ])

  if f = method_scoping[:find]
    f.assert_valid_keys(VALID_FIND_OPTIONS)
    set_readonly_option! f
  end

  # Merge scopings
  if [:merge, :reverse_merge].include?(action) && current_scoped_methods
    method_scoping = current_scoped_methods.inject(method_scoping) do |hash, (method, params)|
      case hash[method]
        when Hash
          if method == :find
            (hash[method].keys + params.keys).uniq.each do |key|
              merge = hash[method][key] && params[key] # merge if both scopes have the same key
              if key == :conditions && merge
                if params[key].is_a?(Hash) && hash[method][key].is_a?(Hash)
                  sql_param_hash    = merge_conditions(hash[method][key].deep_merge(params[key]))
                  hash[method][key] = [sql_param_hash["sqlSegment"]] + sql_param_hash["paramArray"]
                else
                  sql_param_hash    = merge_conditions(params[key], hash[method][key])
                  hash[method][key] = [sql_param_hash["sqlSegment"]] + sql_param_hash["paramArray"]
                end
              elsif key == :include && merge
                hash[method][key] = merge_includes(hash[method][key], params[key]).uniq
              elsif key == :joins && merge
                hash[method][key] = merge_joins(params[key], hash[method][key])
              else
                hash[method][key] = hash[method][key] || params[key]
              end
            end
          else
            if action == :reverse_merge
              hash[method] = hash[method].merge(params)
            else
              hash[method] = params.merge(hash[method])
            end
          end
        else
          hash[method] = params
      end
      hash
    end
  end

  self.scoped_methods << method_scoping
  begin
    yield
  ensure
    self.scoped_methods.pop
  end
end

Instance Method Details

#destroy_without_lock ⇒ Object

Deletes the record in the database and freezes this instance to reflect that no changes should be made (since they can’t be persisted).



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# File 'lib/active_record/connection_adapters/ibm_db_pstmt.rb', line 36

def destroy_without_lock
  unless new_record?
    # Prepare the sql for deleting a row
    pstmt = connection.prepare(
              "DELETE FROM #{self.class.quoted_table_name} " +
              "WHERE #{connection.quote_column_name(self.class.primary_key)} = ?",
              "#{self.class.name} Destroy"
            )
    # Execute the prepared Statement
    connection.prepared_delete(pstmt, [connection.quote_value_for_pstmt(quoted_id)])
  end

  @destroyed = true
  freeze
end

#quote_value(value, column = nil) ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/ibm_db_pstmt.rb', line 30

def quote_value(value, column = nil) #:nodoc:
  connection.quote_value_for_pstmt(value,column)
end