diff options
Diffstat (limited to 'activerecord/lib/arel/visitors')
| -rw-r--r-- | activerecord/lib/arel/visitors/depth_first.rb | 7 | ||||
| -rw-r--r-- | activerecord/lib/arel/visitors/dot.rb | 9 | ||||
| -rw-r--r-- | activerecord/lib/arel/visitors/ibm_db.rb | 13 | ||||
| -rw-r--r-- | activerecord/lib/arel/visitors/informix.rb | 9 | ||||
| -rw-r--r-- | activerecord/lib/arel/visitors/mssql.rb | 16 | ||||
| -rw-r--r-- | activerecord/lib/arel/visitors/oracle12.rb | 11 | ||||
| -rw-r--r-- | activerecord/lib/arel/visitors/postgresql.rb | 14 | ||||
| -rw-r--r-- | activerecord/lib/arel/visitors/to_sql.rb | 211 |
8 files changed, 154 insertions, 136 deletions
diff --git a/activerecord/lib/arel/visitors/depth_first.rb b/activerecord/lib/arel/visitors/depth_first.rb index 92d309453c..d696edc507 100644 --- a/activerecord/lib/arel/visitors/depth_first.rb +++ b/activerecord/lib/arel/visitors/depth_first.rb @@ -35,6 +35,8 @@ module Arel # :nodoc: all alias :visit_Arel_Nodes_Ascending :unary alias :visit_Arel_Nodes_Descending :unary alias :visit_Arel_Nodes_UnqualifiedColumn :unary + alias :visit_Arel_Nodes_OptimizerHints :unary + alias :visit_Arel_Nodes_ValuesList :unary def function(o) visit o.expressions @@ -102,7 +104,6 @@ module Arel # :nodoc: all alias :visit_Arel_Nodes_Regexp :binary alias :visit_Arel_Nodes_RightOuterJoin :binary alias :visit_Arel_Nodes_TableAlias :binary - alias :visit_Arel_Nodes_Values :binary alias :visit_Arel_Nodes_When :binary def visit_Arel_Nodes_StringJoin(o) @@ -180,6 +181,10 @@ module Arel # :nodoc: all visit o.limit end + def visit_Arel_Nodes_Comment(o) + visit o.values + end + def visit_Array(o) o.each { |i| visit i } end diff --git a/activerecord/lib/arel/visitors/dot.rb b/activerecord/lib/arel/visitors/dot.rb index 6389c875cb..ecc386de07 100644 --- a/activerecord/lib/arel/visitors/dot.rb +++ b/activerecord/lib/arel/visitors/dot.rb @@ -46,8 +46,8 @@ module Arel # :nodoc: all visit_edge o, "distinct" end - def visit_Arel_Nodes_Values(o) - visit_edge o, "expressions" + def visit_Arel_Nodes_ValuesList(o) + visit_edge o, "rows" end def visit_Arel_Nodes_StringJoin(o) @@ -82,6 +82,7 @@ module Arel # :nodoc: all alias :visit_Arel_Nodes_Offset :unary alias :visit_Arel_Nodes_On :unary alias :visit_Arel_Nodes_UnqualifiedColumn :unary + alias :visit_Arel_Nodes_OptimizerHints :unary alias :visit_Arel_Nodes_Preceding :unary alias :visit_Arel_Nodes_Following :unary alias :visit_Arel_Nodes_Rows :unary @@ -233,6 +234,10 @@ module Arel # :nodoc: all end alias :visit_Set :visit_Array + def visit_Arel_Nodes_Comment(o) + visit_edge(o, "values") + end + def visit_edge(o, method) edge(method) { visit o.send(method) } end diff --git a/activerecord/lib/arel/visitors/ibm_db.rb b/activerecord/lib/arel/visitors/ibm_db.rb index 73166054da..5cf958f5f0 100644 --- a/activerecord/lib/arel/visitors/ibm_db.rb +++ b/activerecord/lib/arel/visitors/ibm_db.rb @@ -4,6 +4,15 @@ module Arel # :nodoc: all module Visitors class IBM_DB < Arel::Visitors::ToSql private + def visit_Arel_Nodes_SelectCore(o, collector) + collector = super + maybe_visit o.optimizer_hints, collector + end + + def visit_Arel_Nodes_OptimizerHints(o, collector) + hints = o.expr.map { |v| sanitize_as_sql_comment(v) }.join + collector << "/* <OPTGUIDELINES>#{hints}</OPTGUIDELINES> */" + end def visit_Arel_Nodes_Limit(o, collector) collector << "FETCH FIRST " @@ -16,6 +25,10 @@ module Arel # :nodoc: all collector = visit [o.left, o.right, 0, 1], collector collector << ")" end + + def collect_optimizer_hints(o, collector) + collector + end end end end diff --git a/activerecord/lib/arel/visitors/informix.rb b/activerecord/lib/arel/visitors/informix.rb index 0a9713794e..1a4ad1c8d8 100644 --- a/activerecord/lib/arel/visitors/informix.rb +++ b/activerecord/lib/arel/visitors/informix.rb @@ -15,8 +15,9 @@ module Arel # :nodoc: all collector << "ORDER BY " collector = inject_join o.orders, collector, ", " end - collector = maybe_visit o.lock, collector + maybe_visit o.lock, collector end + def visit_Arel_Nodes_SelectCore(o, collector) collector = inject_join o.projections, collector, ", " if o.source && !o.source.empty? @@ -41,10 +42,16 @@ module Arel # :nodoc: all collector end + def visit_Arel_Nodes_OptimizerHints(o, collector) + hints = o.expr.map { |v| sanitize_as_sql_comment(v) }.join(", ") + collector << "/*+ #{hints} */" + end + def visit_Arel_Nodes_Offset(o, collector) collector << "SKIP " visit o.expr, collector end + def visit_Arel_Nodes_Limit(o, collector) collector << "FIRST " visit o.expr, collector diff --git a/activerecord/lib/arel/visitors/mssql.rb b/activerecord/lib/arel/visitors/mssql.rb index fdd864b40d..8475139870 100644 --- a/activerecord/lib/arel/visitors/mssql.rb +++ b/activerecord/lib/arel/visitors/mssql.rb @@ -76,6 +76,16 @@ module Arel # :nodoc: all end end + def visit_Arel_Nodes_SelectCore(o, collector) + collector = super + maybe_visit o.optimizer_hints, collector + end + + def visit_Arel_Nodes_OptimizerHints(o, collector) + hints = o.expr.map { |v| sanitize_as_sql_comment(v) }.join(", ") + collector << "OPTION (#{hints})" + end + def get_offset_limit_clause(o) first_row = o.offset ? o.offset.expr.to_i + 1 : 1 last_row = o.limit ? o.limit.expr.to_i - 1 + first_row : nil @@ -97,12 +107,16 @@ module Arel # :nodoc: all collector = visit o.relation, collector if o.wheres.any? collector << " WHERE " - inject_join o.wheres, collector, AND + inject_join o.wheres, collector, " AND " else collector end end + def collect_optimizer_hints(o, collector) + collector + end + def determine_order_by(orders, x) if orders.any? orders diff --git a/activerecord/lib/arel/visitors/oracle12.rb b/activerecord/lib/arel/visitors/oracle12.rb index b092aa95e0..6269bc3907 100644 --- a/activerecord/lib/arel/visitors/oracle12.rb +++ b/activerecord/lib/arel/visitors/oracle12.rb @@ -8,11 +8,10 @@ module Arel # :nodoc: all def visit_Arel_Nodes_SelectStatement(o, collector) # Oracle does not allow LIMIT clause with select for update if o.limit && o.lock - raise ArgumentError, <<-MSG - 'Combination of limit and lock is not supported. - because generated SQL statements - `SELECT FOR UPDATE and FETCH FIRST n ROWS` generates ORA-02014.` - MSG + raise ArgumentError, <<~MSG + Combination of limit and lock is not supported. Because generated SQL statements + `SELECT FOR UPDATE and FETCH FIRST n ROWS` generates ORA-02014. + MSG end super end @@ -20,7 +19,7 @@ module Arel # :nodoc: all def visit_Arel_Nodes_SelectOptions(o, collector) collector = maybe_visit o.offset, collector collector = maybe_visit o.limit, collector - collector = maybe_visit o.lock, collector + maybe_visit o.lock, collector end def visit_Arel_Nodes_Limit(o, collector) diff --git a/activerecord/lib/arel/visitors/postgresql.rb b/activerecord/lib/arel/visitors/postgresql.rb index 920776b4dc..8296f1cdc1 100644 --- a/activerecord/lib/arel/visitors/postgresql.rb +++ b/activerecord/lib/arel/visitors/postgresql.rb @@ -3,11 +3,6 @@ module Arel # :nodoc: all module Visitors class PostgreSQL < Arel::Visitors::ToSql - CUBE = "CUBE" - ROLLUP = "ROLLUP" - GROUPING_SETS = "GROUPING SETS" - LATERAL = "LATERAL" - private def visit_Arel_Nodes_Matches(o, collector) @@ -57,23 +52,22 @@ module Arel # :nodoc: all end def visit_Arel_Nodes_Cube(o, collector) - collector << CUBE + collector << "CUBE" grouping_array_or_grouping_element o, collector end def visit_Arel_Nodes_RollUp(o, collector) - collector << ROLLUP + collector << "ROLLUP" grouping_array_or_grouping_element o, collector end def visit_Arel_Nodes_GroupingSet(o, collector) - collector << GROUPING_SETS + collector << "GROUPING SETS" grouping_array_or_grouping_element o, collector end def visit_Arel_Nodes_Lateral(o, collector) - collector << LATERAL - collector << SPACE + collector << "LATERAL " grouping_parentheses o, collector end diff --git a/activerecord/lib/arel/visitors/to_sql.rb b/activerecord/lib/arel/visitors/to_sql.rb index f9fe4404eb..4740e6d94f 100644 --- a/activerecord/lib/arel/visitors/to_sql.rb +++ b/activerecord/lib/arel/visitors/to_sql.rb @@ -9,59 +9,6 @@ module Arel # :nodoc: all end class ToSql < Arel::Visitors::Visitor - ## - # This is some roflscale crazy stuff. I'm roflscaling this because - # building SQL queries is a hotspot. I will explain the roflscale so that - # others will not rm this code. - # - # In YARV, string literals in a method body will get duped when the byte - # code is executed. Let's take a look: - # - # > puts RubyVM::InstructionSequence.new('def foo; "bar"; end').disasm - # - # == disasm: <RubyVM::InstructionSequence:foo@<compiled>>===== - # 0000 trace 8 - # 0002 trace 1 - # 0004 putstring "bar" - # 0006 trace 16 - # 0008 leave - # - # The `putstring` bytecode will dup the string and push it on the stack. - # In many cases in our SQL visitor, that string is never mutated, so there - # is no need to dup the literal. - # - # If we change to a constant lookup, the string will not be duped, and we - # can reduce the objects in our system: - # - # > puts RubyVM::InstructionSequence.new('BAR = "bar"; def foo; BAR; end').disasm - # - # == disasm: <RubyVM::InstructionSequence:foo@<compiled>>======== - # 0000 trace 8 - # 0002 trace 1 - # 0004 getinlinecache 11, <ic:0> - # 0007 getconstant :BAR - # 0009 setinlinecache <ic:0> - # 0011 trace 16 - # 0013 leave - # - # `getconstant` should be a hash lookup, and no object is duped when the - # value of the constant is pushed on the stack. Hence the crazy - # constants below. - # - # `matches` and `doesNotMatch` operate case-insensitively via Visitor subclasses - # specialized for specific databases when necessary. - # - - WHERE = " WHERE " # :nodoc: - SPACE = " " # :nodoc: - COMMA = ", " # :nodoc: - GROUP_BY = " GROUP BY " # :nodoc: - ORDER_BY = " ORDER BY " # :nodoc: - WINDOW = " WINDOW " # :nodoc: - AND = " AND " # :nodoc: - - DISTINCT = "DISTINCT" # :nodoc: - def initialize(connection) super() @connection = connection @@ -159,39 +106,20 @@ module Arel # :nodoc: all when Nodes::SqlLiteral, Nodes::BindParam collector = visit(value, collector) else - collector << quote(value) + collector << quote(value).to_s end - collector << COMMA unless k == row_len + collector << ", " unless k == row_len end collector << ")" - collector << COMMA unless i == len + collector << ", " unless i == len } collector end - def visit_Arel_Nodes_Values(o, collector) - collector << "VALUES (" - - len = o.expressions.length - 1 - o.expressions.each_with_index { |value, i| - case value - when Nodes::SqlLiteral, Nodes::BindParam - collector = visit value, collector - else - collector << quote(value).to_s - end - unless i == len - collector << COMMA - end - } - - collector << ")" - end - def visit_Arel_Nodes_SelectStatement(o, collector) if o.with collector = visit o.with, collector - collector << SPACE + collector << " " end collector = o.cores.inject(collector) { |c, x| @@ -199,46 +127,54 @@ module Arel # :nodoc: all } unless o.orders.empty? - collector << ORDER_BY + collector << " ORDER BY " len = o.orders.length - 1 o.orders.each_with_index { |x, i| collector = visit(x, collector) - collector << COMMA unless len == i + collector << ", " unless len == i } end visit_Arel_Nodes_SelectOptions(o, collector) - - collector end def visit_Arel_Nodes_SelectOptions(o, collector) collector = maybe_visit o.limit, collector collector = maybe_visit o.offset, collector - collector = maybe_visit o.lock, collector + maybe_visit o.lock, collector end def visit_Arel_Nodes_SelectCore(o, collector) collector << "SELECT" + collector = collect_optimizer_hints(o, collector) collector = maybe_visit o.set_quantifier, collector - collect_nodes_for o.projections, collector, SPACE + collect_nodes_for o.projections, collector, " " if o.source && !o.source.empty? collector << " FROM " collector = visit o.source, collector end - collect_nodes_for o.wheres, collector, WHERE, AND - collect_nodes_for o.groups, collector, GROUP_BY - collect_nodes_for o.havings, collector, " HAVING ", AND - collect_nodes_for o.windows, collector, WINDOW + collect_nodes_for o.wheres, collector, " WHERE ", " AND " + collect_nodes_for o.groups, collector, " GROUP BY " + collect_nodes_for o.havings, collector, " HAVING ", " AND " + collect_nodes_for o.windows, collector, " WINDOW " - collector + maybe_visit o.comment, collector + end + + def visit_Arel_Nodes_OptimizerHints(o, collector) + hints = o.expr.map { |v| sanitize_as_sql_comment(v) }.join(" ") + collector << "/*+ #{hints} */" + end + + def visit_Arel_Nodes_Comment(o, collector) + collector << o.values.map { |v| "/* #{sanitize_as_sql_comment(v)} */" }.join(" ") end - def collect_nodes_for(nodes, collector, spacer, connector = COMMA) + def collect_nodes_for(nodes, collector, spacer, connector = ", ") unless nodes.empty? collector << spacer inject_join nodes, collector, connector @@ -250,7 +186,7 @@ module Arel # :nodoc: all end def visit_Arel_Nodes_Distinct(o, collector) - collector << DISTINCT + collector << "DISTINCT" end def visit_Arel_Nodes_DistinctOn(o, collector) @@ -259,12 +195,12 @@ module Arel # :nodoc: all def visit_Arel_Nodes_With(o, collector) collector << "WITH " - inject_join o.children, collector, COMMA + inject_join o.children, collector, ", " end def visit_Arel_Nodes_WithRecursive(o, collector) collector << "WITH RECURSIVE " - inject_join o.children, collector, COMMA + inject_join o.children, collector, ", " end def visit_Arel_Nodes_Union(o, collector) @@ -297,13 +233,13 @@ module Arel # :nodoc: all collect_nodes_for o.partitions, collector, "PARTITION BY " if o.orders.any? - collector << SPACE if o.partitions.any? + collector << " " if o.partitions.any? collector << "ORDER BY " collector = inject_join o.orders, collector, ", " end if o.framing - collector << SPACE if o.partitions.any? || o.orders.any? + collector << " " if o.partitions.any? || o.orders.any? collector = visit o.framing, collector end @@ -508,8 +444,8 @@ module Arel # :nodoc: all collector = visit o.left, collector end if o.right.any? - collector << SPACE if o.left - collector = inject_join o.right, collector, SPACE + collector << " " if o.left + collector = inject_join o.right, collector, " " end collector end @@ -529,7 +465,7 @@ module Arel # :nodoc: all def visit_Arel_Nodes_FullOuterJoin(o, collector) collector << "FULL OUTER JOIN " collector = visit o.left, collector - collector << SPACE + collector << " " visit o.right, collector end @@ -543,7 +479,7 @@ module Arel # :nodoc: all def visit_Arel_Nodes_RightOuterJoin(o, collector) collector << "RIGHT OUTER JOIN " collector = visit o.left, collector - collector << SPACE + collector << " " visit o.right, collector end @@ -551,7 +487,7 @@ module Arel # :nodoc: all collector << "INNER JOIN " collector = visit o.left, collector if o.right - collector << SPACE + collector << " " visit(o.right, collector) else collector @@ -577,34 +513,66 @@ module Arel # :nodoc: all end def visit_Arel_Nodes_In(o, collector) - if Array === o.right && !o.right.empty? - o.right.keep_if { |value| boundable?(value) } + unless Array === o.right + return collect_in_clause(o.left, o.right, collector) end - if Array === o.right && o.right.empty? - collector << "1=0" + unless o.right.empty? + o.right.delete_if { |value| unboundable?(value) } + end + + return collector << "1=0" if o.right.empty? + + in_clause_length = @connection.in_clause_length + + if !in_clause_length || o.right.length <= in_clause_length + collect_in_clause(o.left, o.right, collector) else - collector = visit o.left, collector - collector << " IN (" - visit(o.right, collector) << ")" + collector << "(" + o.right.each_slice(in_clause_length).each_with_index do |right, i| + collector << " OR " unless i == 0 + collect_in_clause(o.left, right, collector) + end + collector << ")" end end + def collect_in_clause(left, right, collector) + collector = visit left, collector + collector << " IN (" + visit(right, collector) << ")" + end + def visit_Arel_Nodes_NotIn(o, collector) - if Array === o.right && !o.right.empty? - o.right.keep_if { |value| boundable?(value) } + unless Array === o.right + return collect_not_in_clause(o.left, o.right, collector) + end + + unless o.right.empty? + o.right.delete_if { |value| unboundable?(value) } end - if Array === o.right && o.right.empty? - collector << "1=1" + return collector << "1=1" if o.right.empty? + + in_clause_length = @connection.in_clause_length + + if !in_clause_length || o.right.length <= in_clause_length + collect_not_in_clause(o.left, o.right, collector) else - collector = visit o.left, collector - collector << " NOT IN (" - collector = visit o.right, collector - collector << ")" + o.right.each_slice(in_clause_length).each_with_index do |right, i| + collector << " AND " unless i == 0 + collect_not_in_clause(o.left, right, collector) + end + collector end end + def collect_not_in_clause(left, right, collector) + collector = visit left, collector + collector << " NOT IN (" + visit(right, collector) << ")" + end + def visit_Arel_Nodes_And(o, collector) inject_join o.children, collector, " AND " end @@ -631,6 +599,8 @@ module Arel # :nodoc: all def visit_Arel_Nodes_Equality(o, collector) right = o.right + return collector << "1=0" if unboundable?(right) + collector = visit o.left, collector if right.nil? @@ -664,6 +634,8 @@ module Arel # :nodoc: all def visit_Arel_Nodes_NotEqual(o, collector) right = o.right + return collector << "1=1" if unboundable?(right) + collector = visit o.left, collector if right.nil? @@ -797,6 +769,15 @@ module Arel # :nodoc: all @connection.quote_column_name(name) end + def sanitize_as_sql_comment(value) + return value if Arel::Nodes::SqlLiteral === value + @connection.sanitize_as_sql_comment(value) + end + + def collect_optimizer_hints(o, collector) + maybe_visit o.optimizer_hints, collector + end + def maybe_visit(thing, collector) return collector unless thing collector << " " @@ -814,8 +795,8 @@ module Arel # :nodoc: all } end - def boundable?(value) - !value.respond_to?(:boundable?) || value.boundable? + def unboundable?(value) + value.respond_to?(:unboundable?) && value.unboundable? end def has_join_sources?(o) |