class Arel::Visitors::ToSql
Attributes
last_column[RW]
Public Class Methods
new(connection)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 9 def initialize connection @connection = connection @schema_cache = connection.schema_cache @quoted_tables = {} @quoted_columns = {} @last_column = nil end
Public Instance Methods
accept(object)
click to toggle source
Calls superclass method
Arel::Visitors::Visitor#accept
# File lib/arel/visitors/to_sql.rb, line 17 def accept object self.last_column = nil super end
Private Instance Methods
build_subselect(key, o)
click to toggle source
FIXME: we should probably have a 2-pass visitor for this
# File lib/arel/visitors/to_sql.rb, line 31 def build_subselect key, o stmt = Nodes::SelectStatement.new core = stmt.cores.first core.froms = o.relation core.wheres = o.wheres core.projections = [key] stmt.limit = o.limit stmt.orders = o.orders stmt end
column_cache()
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 104 def column_cache @schema_cache.columns_hash end
column_for(attr)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 95 def column_for attr name = attr.name.to_s table = attr.relation.table_name return nil unless table_exists? table column_cache[table][name] end
literal(o;)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 441 def literal o; o end
Also aliased as: visit_Arel_Nodes_BindParam, visit_Arel_Nodes_SqlLiteral, visit_Arel_SqlLiteral, visit_Bignum, visit_Fixnum
quote(value, column = nil)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 481 def quote value, column = nil @connection.quote value, column end
quote_column_name(name)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 490 def quote_column_name name @quoted_columns[name] ||= Arel::Nodes::SqlLiteral === name ? name : @connection.quote_column_name(name) end
quote_table_name(name)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 485 def quote_table_name name return name if Arel::Nodes::SqlLiteral === name @quoted_tables[name] ||= @connection.quote_table_name(name) end
quoted(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 449 def quoted o quote(o, last_column) end
table_exists?(name)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 91 def table_exists? name @schema_cache.table_exists? name end
visit_Arel_Attributes_Attribute(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 429 def visit_Arel_Attributes_Attribute o self.last_column = column_for o join_name = o.relation.table_alias || o.relation.name "#{quote_table_name join_name}.#{quote_column_name o.name}" end
visit_Arel_Nodes_And(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 388 def visit_Arel_Nodes_And o o.children.map { |x| visit x }.join ' AND ' end
visit_Arel_Nodes_As(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 421 def visit_Arel_Nodes_As o "#{visit o.left} AS #{visit o.right}" end
visit_Arel_Nodes_Ascending(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 257 def visit_Arel_Nodes_Ascending o "#{visit o.expr} ASC" end
visit_Arel_Nodes_Assignment(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 396 def visit_Arel_Nodes_Assignment o right = quote(o.right, column_for(o.left)) "#{visit o.left} = #{right}" end
visit_Arel_Nodes_Avg(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 300 def visit_Arel_Nodes_Avg o "AVG(#{o.expressions.map { |x| visit x }.join(', ')})#{o.alias ? " AS #{visit o.alias}" : ''}" end
visit_Arel_Nodes_Between(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 309 def visit_Arel_Nodes_Between o "#{visit o.left} BETWEEN #{visit o.right}" end
visit_Arel_Nodes_Bin(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 143 def visit_Arel_Nodes_Bin o visit o.expr end
visit_Arel_Nodes_Count(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 279 def visit_Arel_Nodes_Count o "COUNT(#{o.distinct ? 'DISTINCT ' : ''}#{o.expressions.map { |x| visit x }.join(', ')})#{o.alias ? " AS #{visit o.alias}" : ''}" end
visit_Arel_Nodes_CurrentRow(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 215 def visit_Arel_Nodes_CurrentRow o "CURRENT ROW" end
visit_Arel_Nodes_DeleteStatement(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 23 def visit_Arel_Nodes_DeleteStatement o [ "DELETE FROM #{visit o.relation}", ("WHERE #{o.wheres.map { |x| visit x }.join ' AND '}" unless o.wheres.empty?) ].compact.join ' ' end
visit_Arel_Nodes_Descending(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 261 def visit_Arel_Nodes_Descending o "#{visit o.expr} DESC" end
visit_Arel_Nodes_Distinct(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 147 def visit_Arel_Nodes_Distinct o 'DISTINCT' end
visit_Arel_Nodes_DistinctOn(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 151 def visit_Arel_Nodes_DistinctOn o raise NotImplementedError, 'DISTINCT ON not implemented for this db' end
visit_Arel_Nodes_DoesNotMatch(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 333 def visit_Arel_Nodes_DoesNotMatch o "#{visit o.left} NOT LIKE #{visit o.right}" end
visit_Arel_Nodes_Equality(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 401 def visit_Arel_Nodes_Equality o right = o.right if right.nil? "#{visit o.left} IS NULL" else "#{visit o.left} = #{visit right}" end end
visit_Arel_Nodes_Except(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 175 def visit_Arel_Nodes_Except o "( #{visit o.left} EXCEPT #{visit o.right} )" end
visit_Arel_Nodes_Exists(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 78 def visit_Arel_Nodes_Exists o "EXISTS (#{visit o.expressions})#{ o.alias ? " AS #{visit o.alias}" : ''}" end
visit_Arel_Nodes_Extract(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 275 def visit_Arel_Nodes_Extract o "EXTRACT(#{o.field.to_s.upcase} FROM #{visit o.expr})#{o.alias ? " AS #{visit o.alias}" : ''}" end
visit_Arel_Nodes_False(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 87 def visit_Arel_Nodes_False o "FALSE" end
visit_Arel_Nodes_Following(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 211 def visit_Arel_Nodes_Following o "#{o.expr ? visit(o.expr) : 'UNBOUNDED'} FOLLOWING" end
visit_Arel_Nodes_GreaterThan(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 317 def visit_Arel_Nodes_GreaterThan o "#{visit o.left} > #{visit o.right}" end
visit_Arel_Nodes_GreaterThanOrEqual(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 313 def visit_Arel_Nodes_GreaterThanOrEqual o "#{visit o.left} >= #{visit o.right}" end
visit_Arel_Nodes_Group(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 265 def visit_Arel_Nodes_Group o visit o.expr end
visit_Arel_Nodes_Grouping(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 253 def visit_Arel_Nodes_Grouping o "(#{visit o.expr})" end
visit_Arel_Nodes_Having(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 232 def visit_Arel_Nodes_Having o "HAVING #{visit o.expr}" end
visit_Arel_Nodes_In(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 372 def visit_Arel_Nodes_In o if Array === o.right && o.right.empty? '1=0' else "#{visit o.left} IN (#{visit o.right})" end end
visit_Arel_Nodes_InfixOperation(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 468 def visit_Arel_Nodes_InfixOperation o "#{visit o.left} #{o.operator} #{visit o.right}" end
visit_Arel_Nodes_InnerJoin(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 352 def visit_Arel_Nodes_InnerJoin o "INNER JOIN #{visit o.left} #{visit o.right if o.right}" end
visit_Arel_Nodes_InsertStatement(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 66 def visit_Arel_Nodes_InsertStatement o [ "INSERT INTO #{visit o.relation}", ("(#{o.columns.map { |x| quote_column_name x.name }.join ', '})" unless o.columns.empty?), (visit o.values if o.values), ].compact.join ' ' end
visit_Arel_Nodes_Intersect(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 171 def visit_Arel_Nodes_Intersect o "( #{visit o.left} INTERSECT #{visit o.right} )" end
visit_Arel_Nodes_JoinSource(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 337 def visit_Arel_Nodes_JoinSource o [ (visit(o.left) if o.left), o.right.map { |j| visit j }.join(' ') ].compact.join ' ' end
visit_Arel_Nodes_LessThan(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 325 def visit_Arel_Nodes_LessThan o "#{visit o.left} < #{visit o.right}" end
visit_Arel_Nodes_LessThanOrEqual(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 321 def visit_Arel_Nodes_LessThanOrEqual o "#{visit o.left} <= #{visit o.right}" end
visit_Arel_Nodes_Limit(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 240 def visit_Arel_Nodes_Limit o "LIMIT #{visit o.expr}" end
visit_Arel_Nodes_Lock(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 249 def visit_Arel_Nodes_Lock o visit o.expr end
visit_Arel_Nodes_Matches(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 329 def visit_Arel_Nodes_Matches o "#{visit o.left} LIKE #{visit o.right}" end
visit_Arel_Nodes_Max(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 290 def visit_Arel_Nodes_Max o "MAX(#{o.expressions.map { |x| visit x }.join(', ')})#{o.alias ? " AS #{visit o.alias}" : ''}" end
visit_Arel_Nodes_Min(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 295 def visit_Arel_Nodes_Min o "MIN(#{o.expressions.map { |x| visit x }.join(', ')})#{o.alias ? " AS #{visit o.alias}" : ''}" end
visit_Arel_Nodes_NamedFunction(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 269 def visit_Arel_Nodes_NamedFunction o "#{o.name}(#{o.distinct ? 'DISTINCT ' : ''}#{o.expressions.map { |x| visit x }.join(', ')})#{o.alias ? " AS #{visit o.alias}" : ''}" end
visit_Arel_Nodes_NamedWindow(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 179 def visit_Arel_Nodes_NamedWindow o "#{quote_column_name o.name} AS #{visit_Arel_Nodes_Window o}" end
visit_Arel_Nodes_Not(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 360 def visit_Arel_Nodes_Not o "NOT (#{visit o.expr})" end
visit_Arel_Nodes_NotEqual(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 411 def visit_Arel_Nodes_NotEqual o right = o.right if right.nil? "#{visit o.left} IS NOT NULL" else "#{visit o.left} != #{visit right}" end end
visit_Arel_Nodes_NotIn(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 380 def visit_Arel_Nodes_NotIn o if Array === o.right && o.right.empty? '1=1' else "#{visit o.left} NOT IN (#{visit o.right})" end end
visit_Arel_Nodes_Offset(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 236 def visit_Arel_Nodes_Offset o "OFFSET #{visit o.expr}" end
visit_Arel_Nodes_On(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 356 def visit_Arel_Nodes_On o "ON #{visit o.expr}" end
visit_Arel_Nodes_Or(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 392 def visit_Arel_Nodes_Or o "#{visit o.left} OR #{visit o.right}" end
visit_Arel_Nodes_OuterJoin(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 348 def visit_Arel_Nodes_OuterJoin o "LEFT OUTER JOIN #{visit o.left} #{visit o.right}" end
visit_Arel_Nodes_Over(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 219 def visit_Arel_Nodes_Over o case o.right when nil "#{visit o.left} OVER ()" when Arel::Nodes::SqlLiteral "#{visit o.left} OVER #{visit o.right}" when String, Symbol "#{visit o.left} OVER #{quote_column_name o.right.to_s}" else "#{visit o.left} OVER #{visit o.right}" end end
visit_Arel_Nodes_Preceding(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 207 def visit_Arel_Nodes_Preceding o "#{o.expr ? visit(o.expr) : 'UNBOUNDED'} PRECEDING" end
visit_Arel_Nodes_Range(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 199 def visit_Arel_Nodes_Range o if o.expr "RANGE #{visit o.expr}" else "RANGE" end end
visit_Arel_Nodes_Rows(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 191 def visit_Arel_Nodes_Rows o if o.expr "ROWS #{visit o.expr}" else "ROWS" end end
visit_Arel_Nodes_SelectCore(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 129 def visit_Arel_Nodes_SelectCore o [ "SELECT", (visit(o.top) if o.top), (visit(o.set_quantifier) if o.set_quantifier), ("#{o.projections.map { |x| visit x }.join ', '}" unless o.projections.empty?), ("FROM #{visit(o.source)}" if o.source && !o.source.empty?), ("WHERE #{o.wheres.map { |x| visit x }.join ' AND ' }" unless o.wheres.empty?), ("GROUP BY #{o.groups.map { |x| visit x }.join ', ' }" unless o.groups.empty?), (visit(o.having) if o.having), ("WINDOW #{o.windows.map { |x| visit x }.join ', ' }" unless o.windows.empty?) ].compact.join ' ' end
visit_Arel_Nodes_SelectStatement(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 118 def visit_Arel_Nodes_SelectStatement o [ (visit(o.with) if o.with), o.cores.map { |x| visit_Arel_Nodes_SelectCore x }.join, ("ORDER BY #{o.orders.map { |x| visit x }.join(', ')}" unless o.orders.empty?), (visit(o.limit) if o.limit), (visit(o.offset) if o.offset), (visit(o.lock) if o.lock), ].compact.join ' ' end
visit_Arel_Nodes_StringJoin(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 344 def visit_Arel_Nodes_StringJoin o visit o.left end
visit_Arel_Nodes_Sum(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 285 def visit_Arel_Nodes_Sum o "SUM(#{o.expressions.map { |x| visit x }.join(', ')})#{o.alias ? " AS #{visit o.alias}" : ''}" end
visit_Arel_Nodes_TableAlias(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 305 def visit_Arel_Nodes_TableAlias o "#{visit o.relation} #{quote_table_name o.name}" end
visit_Arel_Nodes_Top(o)
click to toggle source
FIXME: this does nothing on most databases, but does on MSSQL
# File lib/arel/visitors/to_sql.rb, line 245 def visit_Arel_Nodes_Top o "" end
visit_Arel_Nodes_True(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 83 def visit_Arel_Nodes_True o "TRUE" end
visit_Arel_Nodes_Union(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 163 def visit_Arel_Nodes_Union o "( #{visit o.left} UNION #{visit o.right} )" end
visit_Arel_Nodes_UnionAll(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 167 def visit_Arel_Nodes_UnionAll o "( #{visit o.left} UNION ALL #{visit o.right} )" end
visit_Arel_Nodes_UnqualifiedColumn(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 425 def visit_Arel_Nodes_UnqualifiedColumn o "#{quote_column_name o.name}" end
visit_Arel_Nodes_UpdateStatement(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 42 def visit_Arel_Nodes_UpdateStatement o if o.orders.empty? && o.limit.nil? wheres = o.wheres else key = o.key unless key warn("(#{caller.first}) Using UpdateManager without setting UpdateManager#key is deprecated and support will be removed in ARel 4.0.0. Please set the primary key on UpdateManager using UpdateManager#key= ") if $VERBOSE key = o.relation.primary_key end wheres = [Nodes::In.new(key, [build_subselect(key, o)])] end [ "UPDATE #{visit o.relation}", ("SET #{o.values.map { |value| visit value }.join ', '}" unless o.values.empty?), ("WHERE #{wheres.map { |x| visit x }.join ' AND '}" unless wheres.empty?), ].compact.join ' ' end
visit_Arel_Nodes_Values(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 108 def visit_Arel_Nodes_Values o "VALUES (#{o.expressions.zip(o.columns).map { |value, attr| if Nodes::SqlLiteral === value visit value else quote(value, attr && column_for(attr)) end }.join ', '})" end
visit_Arel_Nodes_Window(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 183 def visit_Arel_Nodes_Window o s = [ ("ORDER BY #{o.orders.map { |x| visit(x) }.join(', ')}" unless o.orders.empty?), (visit o.framing if o.framing) ].compact.join ' ' "(#{s})" end
visit_Arel_Nodes_With(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 155 def visit_Arel_Nodes_With o "WITH #{o.children.map { |x| visit x }.join(', ')}" end
visit_Arel_Nodes_WithRecursive(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 159 def visit_Arel_Nodes_WithRecursive o "WITH RECURSIVE #{o.children.map { |x| visit x }.join(', ')}" end
visit_Arel_Table(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 364 def visit_Arel_Table o if o.table_alias "#{quote_table_name o.name} #{quote_table_name o.table_alias}" else quote_table_name o.name end end
visit_Array(o)
click to toggle source
# File lib/arel/visitors/to_sql.rb, line 477 def visit_Array o o.empty? ? 'NULL' : o.map { |x| visit x }.join(', ') end