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author | Aaron Patterson <aaron.patterson@gmail.com> | 2010-08-12 11:09:54 -0700 |
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committer | Aaron Patterson <aaron.patterson@gmail.com> | 2010-08-12 11:09:54 -0700 |
commit | 139038130dd0dadc995aeffd2300f0ef72b74258 (patch) | |
tree | 14f6e2b88f59067eac341f2d57c0f8df7ff0f0f8 /lib/arel/engines/sql/relations/compiler.rb | |
parent | 8543c9d302a726a13ef697cbedd96a2135678958 (diff) | |
download | rails-139038130dd0dadc995aeffd2300f0ef72b74258.tar.gz rails-139038130dd0dadc995aeffd2300f0ef72b74258.tar.bz2 rails-139038130dd0dadc995aeffd2300f0ef72b74258.zip |
clean slate
Diffstat (limited to 'lib/arel/engines/sql/relations/compiler.rb')
-rw-r--r-- | lib/arel/engines/sql/relations/compiler.rb | 153 |
1 files changed, 0 insertions, 153 deletions
diff --git a/lib/arel/engines/sql/relations/compiler.rb b/lib/arel/engines/sql/relations/compiler.rb deleted file mode 100644 index c8511374d9..0000000000 --- a/lib/arel/engines/sql/relations/compiler.rb +++ /dev/null @@ -1,153 +0,0 @@ -module Arel - module SqlCompiler - class GenericCompiler - attr_reader :relation, :engine - - def initialize(relation) - @relation = relation - @engine = relation.engine - end - - def christener - relation.christener - end - - def select_sql - projections = @relation.projections - if Count === projections.first && projections.size == 1 && - (relation.taken.present? || relation.wheres.present?) && relation.joins(self).blank? - subquery = [ - "SELECT 1 FROM #{relation.from_clauses}", build_clauses - ].join ' ' - query = "SELECT COUNT(*) AS count_id FROM (#{subquery}) AS subquery" - else - query = [ - "SELECT #{relation.select_clauses.join(', ')}", - "FROM #{relation.from_clauses}", - build_clauses - ].compact.join ' ' - end - query - end - - def build_clauses - joins = relation.joins(self) - wheres = relation.where_clauses - groups = relation.group_clauses - havings = relation.having_clauses - orders = relation.order_clauses - - clauses = [ "", - joins, - ("WHERE #{wheres.join(' AND ')}" unless wheres.empty?), - ("GROUP BY #{groups.join(', ')}" unless groups.empty?), - ("HAVING #{havings.join(' AND ')}" unless havings.empty?), - ("ORDER BY #{orders.join(', ')}" unless orders.empty?) - ].compact.join ' ' - - offset = relation.skipped - limit = relation.taken - @engine.connection.add_limit_offset!(clauses, :limit => limit, - :offset => offset) if offset || limit - - clauses << " #{locked}" unless locked.blank? - clauses unless clauses.blank? - end - - def delete_sql - build_query \ - "DELETE", - "FROM #{relation.table_sql}", - ("WHERE #{relation.wheres.collect { |x| x.to_sql }.join(' AND ')}" unless relation.wheres.blank? ), - (add_limit_on_delete(relation.taken) unless relation.taken.blank? ) - end - - def add_limit_on_delete(taken) - "LIMIT #{taken}" - end - - def insert_sql(include_returning = true) - insertion_attributes_values_sql = if relation.record.is_a?(Value) - relation.record.value - else - attributes = relation.record.keys.sort_by do |attribute| - attribute.name.to_s - end - - first = attributes.collect do |key| - @engine.connection.quote_column_name(key.name) - end.join(', ') - - second = attributes.collect do |key| - key.format(relation.record[key]) - end.join(', ') - - build_query "(#{first})", "VALUES (#{second})" - end - - build_query \ - "INSERT", - "INTO #{relation.table_sql}", - insertion_attributes_values_sql, - ("RETURNING #{engine.connection.quote_column_name(primary_key)}" if include_returning && relation.compiler.supports_insert_with_returning?) - end - - def supports_insert_with_returning? - false - end - - def update_sql - build_query \ - "UPDATE #{relation.table_sql} SET", - assignment_sql, - build_update_conditions_sql - end - - protected - - def locked - relation.locked - end - - def build_query(*parts) - parts.compact.join(" ") - end - - def assignment_sql - if relation.assignments.respond_to?(:collect) - attributes = relation.assignments.keys.sort_by do |attribute| - attribute.name.to_s - end - - attributes.map do |attribute| - value = relation.assignments[attribute] - "#{@engine.connection.quote_column_name(attribute.name)} = #{attribute.format(value)}" - end.join(", ") - else - relation.assignments.value - end - end - - def build_update_conditions_sql - conditions = "" - conditions << " WHERE #{relation.wheres.map { |x| x.to_sql }.join(' AND ')}" unless relation.wheres.blank? - conditions << " ORDER BY #{relation.order_clauses.join(', ')}" unless relation.orders.blank? - - taken = relation.taken - unless taken.blank? - conditions = limited_update_conditions(conditions, taken) - end - - conditions - end - - def limited_update_conditions(conditions, taken) - conditions << " LIMIT #{taken}" - quoted_primary_key = @engine.connection.quote_column_name(relation.primary_key) - "WHERE #{quoted_primary_key} IN (SELECT #{quoted_primary_key} FROM #{@engine.connection.quote_table_name relation.table.name} #{conditions})" - end - - end - - end -end |