Class: TSQLStmt
- Inherits:
-
Object
- Object
- TSQLStmt
- Defined in:
- lib/tsql_shparser/tsql_stmt.rb
Overview
The main class which identifies the various clauses for the t-SQL Statement. It constructs the TSQLStmt object from the array of tokens parsed by the Parser. Generates a TokenStream object out of this array and provides methods to query the TokenStream.
Constant Summary collapse
- VERSION =
"0.0.1"
- @@follow =
Hash used in determining which clauses follow the clause indicated by the key
{ 'SELECT' => ['INTO','FROM','JOIN','WHERE','GROUP','HAVING','UNION','ORDER'], 'FROM' => ['JOIN','WHERE','GROUP','HAVING','UNION','ORDER'], 'JOIN' => ['WHERE','GROUP','HAVING','UNION','ORDER'], 'WHERE' => ['GROUP','HAVING','UNION','ORDER'], 'GROUP' => ['HAVING','UNION','ORDER'], 'HAVING' => ['UNION','ORDER'], 'UNION' => ['ORDER'], 'SET' => ['FROM','JOIN','WHERE','UNION'], # Part of the UPDATE }
Instance Attribute Summary collapse
-
#col ⇒ Object
readonly
Returns the value of attribute col.
-
#line ⇒ Object
readonly
Returns the value of attribute line.
-
#stmt ⇒ Object
readonly
Convert the array of tokens to a TokenStream object.
-
#typ ⇒ Object
readonly
Returns the value of attribute typ.
Instance Method Summary collapse
- #alias_columns(all = false) ⇒ Object (also: #column_aliases)
- #alias_from(all = false) ⇒ Object (also: #from_aliases)
- #alias_hash(of = "ALL") ⇒ Object
- #alias_join(all = false) ⇒ Object (also: #join_aliases)
- #clause_from ⇒ Object (also: #from)
- #clause_group_by ⇒ Object (also: #group_by)
- #clause_having ⇒ Object (also: #having)
- #clause_into ⇒ Object (also: #into)
- #clause_join ⇒ Object (also: #join_on)
- #clause_order_by ⇒ Object (also: #order_by)
- #clause_set ⇒ Object (also: #set)
- #clause_where ⇒ Object (also: #where)
- #columns_all ⇒ Object (also: #all_columns)
- #columns_delete(all = false) ⇒ Object
- #columns_from(all = false) ⇒ Object
- #columns_group_by(all = false) ⇒ Object (also: #group_by_columns)
- #columns_having(all = false) ⇒ Object (also: #having_columns)
- #columns_insert(all = false) ⇒ Object (also: #insert_columns)
- #columns_join_on(all = false) ⇒ Object (also: #join_columns)
- #columns_order_by ⇒ Object (also: #order_by_columns)
- #columns_select(all = false) ⇒ Object (also: #select_columns)
- #columns_update(all = false) ⇒ Object (also: #update_columns)
- #columns_where(all = false) ⇒ Object (also: #where_columns)
- #hdr_delete ⇒ Object
- #hdr_insert ⇒ Object
- #hdr_select ⇒ Object
- #hdr_update ⇒ Object
-
#initialize(st) ⇒ TSQLStmt
constructor
Constructor: takes in array of tokens created by the ShParser.
- #list_join(join_cl, prev) ⇒ Object
-
#list_select_expressions ⇒ Object
List all the expressions in the SELECT part of the statement Returns an array of TokenStream objects.
- #list_sub_selects(st = nil) ⇒ Object
- #list_union ⇒ Object
- #method_missing(methId, *args) ⇒ Object
- #table_alter ⇒ Object (also: #alter_table)
- #table_create ⇒ Object (also: #create_table)
- #table_delete ⇒ Object (also: #delete_table)
- #table_insert ⇒ Object (also: #insert_table)
- #table_into ⇒ Object (also: #into_table)
- #table_truncate ⇒ Object (also: #truncate_table)
- #table_update ⇒ Object (also: #update_table)
- #tables_all(kind = nil) ⇒ Object (also: #all_tables)
- #tables_drop ⇒ Object (also: #drop_tables)
- #tables_from(all = false) ⇒ Object (also: #from_tables)
- #tables_join(all = false) ⇒ Object (also: #join_tables)
- #tables_modified ⇒ Object (also: #modified_tables)
- #tables_referred ⇒ Object (also: #referred_tables)
- #tables_where(all = false) ⇒ Object (also: #where_tables)
Constructor Details
#initialize(st) ⇒ TSQLStmt
Constructor: takes in array of tokens created by the ShParser. Each array has tokens of exactly one SQL statement. Sometimes the array may have some extra tokens towards the end, since the parser could not correctly identify the end of the statement.
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# File 'lib/tsql_shparser/tsql_stmt.rb', line 93 def initialize(st) @stmt = st if (@stmt and @stmt[0]) @typ = @stmt[0].token_value @typ = 'INTO' if ((@typ == 'SELECT') and (TokenStream.new(@stmt).find_matching_word('INTO') > 0)) @line = @stmt[0].line @col = @stmt[0].col end end |
Dynamic Method Handling
This class handles dynamic methods through the method_missing method
#method_missing(methId, *args) ⇒ Object
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# File 'lib/tsql_shparser/tsql_stmt.rb', line 625 def method_missing(methId,*args) str = methId.id2name str = ((str[-1] == ?s) ? str.chop : (str + 's')) self.send(str,*args) if self.respond_to?(str) end |
Instance Attribute Details
#col ⇒ Object (readonly)
Returns the value of attribute col.
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# File 'lib/tsql_shparser/tsql_stmt.rb', line 87 def col @col end |
#line ⇒ Object (readonly)
Returns the value of attribute line.
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# File 'lib/tsql_shparser/tsql_stmt.rb', line 86 def line @line end |
#stmt ⇒ Object (readonly)
Convert the array of tokens to a TokenStream object
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# File 'lib/tsql_shparser/tsql_stmt.rb', line 175 def stmt @stmt end |
#typ ⇒ Object (readonly)
Returns the value of attribute typ.
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# File 'lib/tsql_shparser/tsql_stmt.rb', line 84 def typ @typ end |
Instance Method Details
#alias_columns(all = false) ⇒ Object Also known as: column_aliases
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# File 'lib/tsql_shparser/tsql_stmt.rb', line 422 def alias_columns(all=false) cols = TokenStream.new self.list_select_expressions.each{|list| cols += name_picker(list) } cols - columns_select end |
#alias_from(all = false) ⇒ Object Also known as: from_aliases
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# File 'lib/tsql_shparser/tsql_stmt.rb', line 431 def alias_from(all=false) tbls = name_picker(clause_from) tbls - tables_from(all) end |
#alias_hash(of = "ALL") ⇒ Object
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# File 'lib/tsql_shparser/tsql_stmt.rb', line 436 def alias_hash(of="ALL") case of.upcase when "FROM" name_alias = name_picker(clause_from).to_arr names = tables_from.to_arr when "JOIN" name_alias = [] clause_join.each{|list| name_alias += name_picker(list).to_arr } names = tables_join.to_arr when "ALL" name_alias = name_picker(clause_from).to_arr clause_join.each{|list| name_alias += name_picker(list).to_arr } names = (tables_from + tables_join).to_arr end a_hash={} names.each{|nm| i = name_alias.index(nm) a = nil a = name_alias[i+1] if i and (not names.include?(name_alias[i+1])) a_hash[nm] = a if a } a_hash end |
#alias_join(all = false) ⇒ Object Also known as: join_aliases
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# File 'lib/tsql_shparser/tsql_stmt.rb', line 533 def alias_join(all=false) tbls = TokenStream.new clause_join.each{|list| tbls += name_picker(list)} tbls - tables_join(all) - columns_join_on(all) end |
#clause_from ⇒ Object Also known as: from
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# File 'lib/tsql_shparser/tsql_stmt.rb', line 409 def clause_from k,n = clause('FROM') if n > 0 k.pop if k[-1].token_value == 'OUTER' k.pop if ['CROSS','INNER','LEFT','RIGHT','FULL'].include?(k[-1].token_value) end k end |
#clause_group_by ⇒ Object Also known as: group_by
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# File 'lib/tsql_shparser/tsql_stmt.rb', line 542 def clause_group_by; k,n = clause('GROUP'); k; end |
#clause_having ⇒ Object Also known as: having
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# File 'lib/tsql_shparser/tsql_stmt.rb', line 545 def clause_having; k,n = clause('HAVING'); k; end |
#clause_into ⇒ Object Also known as: into
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# File 'lib/tsql_shparser/tsql_stmt.rb', line 384 def clause_into into = TokenStream.new if @stmt n = nil @stmt.each_with_index{|tok,i| (n = i; break) if tok.token_value == 'INTO' } into = self.stmt.slice(n..(n+1)) if n end into end |
#clause_join ⇒ Object Also known as: join_on
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# File 'lib/tsql_shparser/tsql_stmt.rb', line 510 def clause_join return [] unless @stmt join,n = clause('JOIN') prev = ((n > 1) ? @stmt.slice((n-2)..(n-1)) : []) list_join(join,prev) end |
#clause_order_by ⇒ Object Also known as: order_by
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# File 'lib/tsql_shparser/tsql_stmt.rb', line 400 def clause_order_by order_by = TokenStream.new return order_by unless @stmt n = self.stmt.find_matching_word('ORDER') order_by = self.stmt.slice(n..-1) if n > 0 order_by end |
#clause_set ⇒ Object Also known as: set
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# File 'lib/tsql_shparser/tsql_stmt.rb', line 548 def clause_set; k,n = clause('SET'); k; end |
#clause_where ⇒ Object Also known as: where
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# File 'lib/tsql_shparser/tsql_stmt.rb', line 539 def clause_where; k,n = clause('WHERE'); k; end |
#columns_all ⇒ Object Also known as: all_columns
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# File 'lib/tsql_shparser/tsql_stmt.rb', line 286 def columns_all all_cols = TokenStream.new return all_cols if ['DROP','TRUNCATE'].include?(self.typ) all_cols += columns_select(true) + columns_insert(true) + columns_update(true) + columns_from(true) + columns_join_on(true) + columns_where(true) + columns_group_by(true) + columns_having(true) + columns_order_by() list_union.each{|st| n = 0 st.each_with_index{|tok,i| (n=i; break) if tok.token_value == 'SELECT'} ss = TSQLStmt.new(st.slice(n..-1)) all_cols += ss.columns_select(true) + ss.columns_from(true) + ss.columns_join_on(true) + ss.columns_where(true) + ss.columns_group_by(true) + ss.columns_having(true) + ss.columns_order_by() } all_cols end |
#columns_delete(all = false) ⇒ Object
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# File 'lib/tsql_shparser/tsql_stmt.rb', line 245 def columns_delete(all=false) cols = TokenStream.new return cols unless self.typ == 'DELETE' i = ((@stmt[1].token_value == 'FROM') ? 3 : 2) cols end |
#columns_from(all = false) ⇒ Object
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# File 'lib/tsql_shparser/tsql_stmt.rb', line 418 def columns_from(all=false) name_picker(clause_from,(all ? "columns_all" : "")){|i,prev| false } end |
#columns_group_by(all = false) ⇒ Object Also known as: group_by_columns
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# File 'lib/tsql_shparser/tsql_stmt.rb', line 543 def columns_group_by(all=false); name_picker(clause_group_by,(all ? "columns_all" : "")) end |
#columns_having(all = false) ⇒ Object Also known as: having_columns
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# File 'lib/tsql_shparser/tsql_stmt.rb', line 546 def columns_having(all=false); name_picker(clause_having,(all ? "columns_all" : "")) end |
#columns_insert(all = false) ⇒ Object Also known as: insert_columns
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# File 'lib/tsql_shparser/tsql_stmt.rb', line 254 def columns_insert(all=false) cols = TokenStream.new return cols unless self.typ == 'INSERT' j = 0 i = ((@stmt[1].token_value == 'INTO') ? 3 : 2) return cols if ((@stmt[i] == nil) or (@stmt[i].token_value == 'EXECUTE') or (@stmt[i].token_value == 'EXEC')) if (@stmt[i].token_value == LEFT_PARAN) j = self.stmt.find_matching_paran(i) end j += i cols += name_picker(self.stmt.slice(i..j)) if j > i cols += name_picker(self.stmt.slice((j+1)..-1),"columns_all") if all cols end |
#columns_join_on(all = false) ⇒ Object Also known as: join_columns
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# File 'lib/tsql_shparser/tsql_stmt.rb', line 520 def columns_join_on(all=false) cols = TokenStream.new clause_join.each{|list| cols += name_picker(list,(all ? "columns_all" : "columns_join_on")){|i,prev| ((i < 1) or (not ['JOIN','AS',RIGHT_PARAN].include?(prev.token_value))) and ((i < 1) or (prev.token_type != :Id)) and (i > list.to_arr.index('ON')) } } cols end |
#columns_order_by ⇒ Object Also known as: order_by_columns
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# File 'lib/tsql_shparser/tsql_stmt.rb', line 591 def columns_order_by # Does not handle case ... end clause_order_by.select{|tok| (not ['ORDER','BY',',','ASC','DESC'].include?(tok.token_value)) and (tok.token_type == :Id) #((tok.token_type == :Number) or (tok.token_type == :Id)) } end |
#columns_select(all = false) ⇒ Object Also known as: select_columns
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# File 'lib/tsql_shparser/tsql_stmt.rb', line 274 def columns_select(all=false) cols = TokenStream.new self.list_select_expressions.each{|list| cols += name_picker(list,(all ? "columns_all" :"columns_select")){|i,prev,nxt| ((nxt == nil) or (nxt.token_value != '=')) and ((i < 1) or (not ['AS',RIGHT_PARAN,'END'].include?(prev.token_value))) and ((i < 1) or (not [:Id,:String,:Number,:HostVariable].include?(prev.token_type))) } } cols end |
#columns_update(all = false) ⇒ Object Also known as: update_columns
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# File 'lib/tsql_shparser/tsql_stmt.rb', line 550 def columns_update(all=false) cols = TokenStream.new return cols unless self.typ == 'UPDATE' if all cols += name_picker(clause_set,"columns_all") else cols += name_picker(clause_set,"columns_update"){|i,prev,nxt| ((i < 1) or (['SET',','].include?(prev.token_value))) and ((nxt == nil) or (nxt.token_value == '=')) } end cols end |
#columns_where(all = false) ⇒ Object Also known as: where_columns
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# File 'lib/tsql_shparser/tsql_stmt.rb', line 540 def columns_where(all=false); name_picker(clause_where,(all ? "columns_all" : "columns_where")); end |
#hdr_delete ⇒ Object
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# File 'lib/tsql_shparser/tsql_stmt.rb', line 242 def hdr_delete; hdr('DELETE'); end |
#hdr_insert ⇒ Object
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# File 'lib/tsql_shparser/tsql_stmt.rb', line 240 def hdr_insert; hdr('INSERT'); end |
#hdr_select ⇒ Object
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# File 'lib/tsql_shparser/tsql_stmt.rb', line 222 def hdr_select hdr = TokenStream.new return hdr unless ((self.typ == 'SELECT') or (self.typ == 'INTO')) prev = nil @stmt.each{|tok| if (tok.token_type == :KeyWord) hdr += [tok] elsif (tok.token_type == :Number) and (prev.token_value == 'TOP') hdr += [tok] else break end prev = tok } hdr end |
#hdr_update ⇒ Object
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# File 'lib/tsql_shparser/tsql_stmt.rb', line 241 def hdr_update; hdr('UPDATE'); end |
#list_join(join_cl, prev) ⇒ Object
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# File 'lib/tsql_shparser/tsql_stmt.rb', line 467 def list_join(join_cl,prev) join_lyst = [] return join_lyst if join_cl.length == 0 n = join_cl.find_matching_word('JOIN',1) while n > 0 j = join_cl.slice(0..n) if ((prev.length > 0) and (prev[-1].token_value == 'OUTER')) j.unshift(prev[-1]) prev = prev.slice(0...-1) end if ((prev.length > 0) and (['INNER','LEFT','RIGHT','CROSS','FULL'].include?(prev[-1].token_value))) j.unshift(prev[-1]) end prev = j j = j.slice(0...-1) if (j[-1].token_value == 'OUTER') j = j.slice(0...-1) if (['INNER','LEFT','RIGHT','CROSS','FULL'].include?(j[-1].token_value)) join_lyst << TokenStream.new(j) join_cl = join_cl.slice((n+1)..-1) n = join_cl.find_matching_word('JOIN',1) end if ((prev.length > 0) and (prev[-1].token_value == 'OUTER')) join_cl.unshift(prev[-1]) prev = prev.slice(0...-1) end if ((prev.length > 0) and (['INNER','LEFT','RIGHT','CROSS','FULL'].include?(prev[-1].token_value))) join_cl.unshift(prev[-1]) end join_lyst << join_cl join_lyst end |
#list_select_expressions ⇒ Object
List all the expressions in the SELECT part of the statement Returns an array of TokenStream objects. Each object in the array is exactly one expression of the SELECT.
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# File 'lib/tsql_shparser/tsql_stmt.rb', line 180 def list_select_expressions columns,list = [],[] return unless (@stmt and ((self.typ == 'SELECT') or (self.typ == 'INTO'))) # Skip the header part of the SELECT prev,n = nil,nil @stmt.each_with_index{|tok,i| (prev = tok; next) if ["SELECT","ALL", "DISTINCT", "TOP", "PERCENT", "WITH", "TIES"].include?(tok.token_value) next if ((tok.token_value =~ /^\d+$/) and prev and (prev.token_value == 'TOP')) n = i break } # Find the end of the expression list. if n m = self.stmt.find_matching_word(@@follow['SELECT'],n) list = self.stmt.slice(n..((m == 0) ? -1: n+m-1)) end i = 0 column = TokenStream.new while i < list.length tok = list[i] k = ((tok.token_value == LEFT_PARAN) ? list.find_matching_paran(i) : 1) raise "I cannot find matching paran in:\n #{list.slice(i..-1).to_arr.inspect}\n" if k == 0 column += list.slice(i...(i+k)) if (list[i+k-1] and (list[i+k-1].token_value == ",")) columns << column column = TokenStream.new end i += k end columns << column rescue puts $!.to_s ensure return columns end |
#list_sub_selects(st = nil) ⇒ Object
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# File 'lib/tsql_shparser/tsql_stmt.rb', line 599 def list_sub_selects(st=nil) return [] unless @stmt sub_selects = [] ss = st || self.stmt begin n,prev = nil,nil # Find the first occurance of SELECT ss.each_with_index{|tok,i| (n = i; break) if ((tok.token_value == 'SELECT') and prev and (prev.token_value == LEFT_PARAN)) prev = tok } if n m = ss.find_matching_paran(n-1) sub_selects << ss.slice((n-1)...(n+m)) ss = ss.slice((n+m)..-1) end end while n sub_selects end |
#list_union ⇒ Object
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# File 'lib/tsql_shparser/tsql_stmt.rb', line 565 def list_union return [] unless @stmt union_lyst = [] n = self.stmt.find_matching_word('UNION') return union_lyst if n == 0 union_cl = self.stmt.slice(n..-1) n = union_cl.find_matching_word('UNION',1) while n > 0 u = union_cl.slice(0..n) union_lyst << u union_cl = union_cl.slice((n+1)..-1) n = union_cl.find_matching_word('UNION',1) end n = union_cl.find_matching_word('ORDER',1) union_lyst << ((n > 0) ? union_cl.slice(0..n) : union_cl) union_lyst end |
#table_alter ⇒ Object Also known as: alter_table
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# File 'lib/tsql_shparser/tsql_stmt.rb', line 313 def table_alter; TokenStream.new(((self.typ == 'ALTER') and (@stmt[1].token_value == 'TABLE')) ? [@stmt[2]] : []); end |
#table_create ⇒ Object Also known as: create_table
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# File 'lib/tsql_shparser/tsql_stmt.rb', line 311 def table_create; TokenStream.new(((self.typ == 'CREATE') and (self.typ == 'TABLE')) ? [@stmt[2]] : []); end |
#table_delete ⇒ Object Also known as: delete_table
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# File 'lib/tsql_shparser/tsql_stmt.rb', line 345 def table_delete tbl = [] if (self.typ == 'DELETE') tbl = ((@stmt[1].token_value == 'FROM') ? [@stmt[2]] : [@stmt[1]]) end TokenStream.new(tbl) end |
#table_insert ⇒ Object Also known as: insert_table
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# File 'lib/tsql_shparser/tsql_stmt.rb', line 337 def table_insert tbl = [] if (self.typ == 'INSERT') tbl = ((@stmt[1].token_value == 'INTO') ? [@stmt[2]] : [@stmt[1]]) end TokenStream.new(tbl) end |
#table_into ⇒ Object Also known as: into_table
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# File 'lib/tsql_shparser/tsql_stmt.rb', line 308 def table_into; TokenStream.new((self.typ == 'INTO') ? [clause_into[1]] : []); end |
#table_truncate ⇒ Object Also known as: truncate_table
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# File 'lib/tsql_shparser/tsql_stmt.rb', line 310 def table_truncate; TokenStream.new((self.typ == 'TRUNCATE') ? [@stmt[2]] : []); end |
#table_update ⇒ Object Also known as: update_table
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# File 'lib/tsql_shparser/tsql_stmt.rb', line 309 def table_update; TokenStream.new((self.typ == 'UPDATE') ? [@stmt[1]] : []); end |
#tables_all(kind = nil) ⇒ Object Also known as: all_tables
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# File 'lib/tsql_shparser/tsql_stmt.rb', line 367 def tables_all(kind=nil) mod_tbls = table_insert + table_delete + table_update + table_into + table_create + tables_drop + table_truncate + table_alter ref_tbls = tables_where + tables_from(true) + tables_join(true) list_union.each{|st| n = 0 st.each_with_index{|tok,i| (n=i; break) if tok.token_value == 'SELECT'} ss = TSQLStmt.new(st.slice(n..-1)) ref_tbls += ss.tables_from(true) + ss.tables_join(true) } all_tbls = mod_tbls + ref_tbls (kind ? ((kind == 'mod') ? mod_tbls : ref_tbls) : all_tbls) end |
#tables_drop ⇒ Object Also known as: drop_tables
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# File 'lib/tsql_shparser/tsql_stmt.rb', line 315 def tables_drop tbls = TokenStream.new tbls = TokenStream.new(@stmt.select{|tok| tok.token_type == :Id}) if ((self.typ == 'DROP') and @stmt[1] and (@stmt[1].token_value == 'TABLE')) tbls end |
#tables_from(all = false) ⇒ Object Also known as: from_tables
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# File 'lib/tsql_shparser/tsql_stmt.rb', line 321 def tables_from(all=false) tbls = name_picker(clause_from,(all ? "tables_all" : "tables_from")){|i,prev| ((i < 1) or (not ['AS',RIGHT_PARAN].include?(prev.token_value))) and ((i < 1) or (prev.token_type != :Id)) } tbls end |
#tables_join(all = false) ⇒ Object Also known as: join_tables
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# File 'lib/tsql_shparser/tsql_stmt.rb', line 353 def tables_join(all=false) tbls = TokenStream.new clause_join.each{|list| tbls += name_picker(list,(all ? "tables_all" : "tables_join")){|i,prev,nxt| ((i < 1) or (not ['AS',RIGHT_PARAN].include?(prev.token_value))) and ((i < 1) or (prev.token_type != :Id)) and (i < list.to_arr.index('ON')) } } tbls end |
#tables_modified ⇒ Object Also known as: modified_tables
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# File 'lib/tsql_shparser/tsql_stmt.rb', line 382 def tables_modified; tables_all('mod'); end |
#tables_referred ⇒ Object Also known as: referred_tables
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# File 'lib/tsql_shparser/tsql_stmt.rb', line 381 def tables_referred; tables_all('ref'); end |
#tables_where(all = false) ⇒ Object Also known as: where_tables
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# File 'lib/tsql_shparser/tsql_stmt.rb', line 329 def tables_where(all=false) tbls = TokenStream.new list_sub_selects(clause_where).each{|ss| tbls += TSQLStmt.new(ss.slice(1...-1)).tables_all } tbls end |