Class: SQL::Maker

Inherits:
Object
  • Object
show all
Includes:
Util
Defined in:
lib/sql/maker.rb,
lib/sql/maker/error.rb

Defined Under Namespace

Modules: Helper, Quoting, Util Classes: Condition, Error, Select, SelectSet

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Util

#array_wrap, #bind_param, bind_param, #croak, included, #parse_args, #quote_identifier, quote_identifier

Constructor Details

#initialize(args) ⇒ Maker

Returns a new instance of Maker.



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# File 'lib/sql/maker.rb', line 17

def initialize(args)
  unless @driver = args[:driver].to_s.downcase
    croak(":driver is required for creating new instance of SQL::Maker")
  end
  unless @quote_char = args[:quote_char]
    @quote_char =
      if @driver == 'mysql'
        %q{`}
      else
        %q{"}
      end
  end
  @select_class = @driver == 'oracle' ? SQL::Maker::Select::Oracle : SQL::Maker::Select

  @name_sep = args[:name_sep] || '.'
  @new_line = args[:new_line] || "\n"
  @strict = args[:strict] || false
  @auto_bind = args[:auto_bind] || false # apply client-side prepared statement binding autocatically
end

Instance Attribute Details

#auto_bind ⇒ Object

todo def self.load_plugin(role)

load "sql/maker/plugin/#{role}.rb"
self.include "SQL::Maker::Plugin::#{role.camelize}"

end



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# File 'lib/sql/maker.rb', line 15

def auto_bind
  @auto_bind
end

#driver ⇒ Object

todo def self.load_plugin(role)

load "sql/maker/plugin/#{role}.rb"
self.include "SQL::Maker::Plugin::#{role.camelize}"

end



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# File 'lib/sql/maker.rb', line 15

def driver
  @driver
end

#name_sep ⇒ Object

todo def self.load_plugin(role)

load "sql/maker/plugin/#{role}.rb"
self.include "SQL::Maker::Plugin::#{role.camelize}"

end



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# File 'lib/sql/maker.rb', line 15

def name_sep
  @name_sep
end

#new_line ⇒ Object

todo def self.load_plugin(role)

load "sql/maker/plugin/#{role}.rb"
self.include "SQL::Maker::Plugin::#{role.camelize}"

end



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# File 'lib/sql/maker.rb', line 15

def new_line
  @new_line
end

#quote_char ⇒ Object

todo def self.load_plugin(role)

load "sql/maker/plugin/#{role}.rb"
self.include "SQL::Maker::Plugin::#{role.camelize}"

end



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# File 'lib/sql/maker.rb', line 15

def quote_char
  @quote_char
end

#select_class ⇒ Object

todo def self.load_plugin(role)

load "sql/maker/plugin/#{role}.rb"
self.include "SQL::Maker::Plugin::#{role.camelize}"

end



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# File 'lib/sql/maker.rb', line 15

def select_class
  @select_class
end

#strict ⇒ Object

todo def self.load_plugin(role)

load "sql/maker/plugin/#{role}.rb"
self.include "SQL::Maker::Plugin::#{role.camelize}"

end



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# File 'lib/sql/maker.rb', line 15

def strict
  @strict
end

Instance Method Details

#_make_where_clause(where = nil) ⇒ Object 



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# File 'lib/sql/maker.rb', line 232

def _make_where_clause(where = nil)
  return ['', []] unless where

  w = self._make_where_condition(where)
  sql = w.as_sql
  return [sql.empty? ? "" : " WHERE #{sql}", array_wrap(w.bind)]
end

#_make_where_condition(where = nil) ⇒ Object 



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# File 'lib/sql/maker.rb', line 210

def _make_where_condition(where = nil)
  return self.new_condition unless where
  if where.respond_to?(:as_sql)
    return where
  end

  cond = self.new_condition
  while true
    col, val =
      if where.is_a?(Hash)
        where.shift
      elsif where.is_a?(Array)
        where.slice!(0, 2)
      else
        [where, nil]
      end
    break unless col
    cond.add(col => val)
  end
  return cond
end

#_quote(label) ⇒ Object 



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# File 'lib/sql/maker.rb', line 119

def _quote(label) 
  SQL::Maker::Util::quote_identifier(label, self.quote_char, self.name_sep)
end

#delete(*args) ⇒ Object 



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# File 'lib/sql/maker.rb', line 123

def delete(*args)
  table, where, opt =
    if args.size == 1 and args.first.is_a?(Hash)
      args = args.first.dup
      [args.delete(:table), args.delete(:where) || {}, args]
    else
      [args[0], args[1] || {}, args[2] || {}]
    end

  w = self._make_where_clause(where)
  quoted_table = self._quote(table)
  sql = "DELETE FROM #{quoted_table}"
  if opt[:using]
    # bulder.delete('foo', \%where, { :using => 'bar' })
    # bulder.delete('foo', \%where, { :using => ['bar', 'qux'] })
    tables = array_wrap(opt[:using])
    sql += " USING " + tables.map {|t| self._quote(t) }.join(', ')
  end
  sql += w[0]

  @auto_bind ? bind_param(sql, w[1]) : [sql, w[1]]
end

#insert(*args) ⇒ Object 



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# File 'lib/sql/maker.rb', line 54

def insert(*args)
  table, values, opt =
    if args.size == 1 and args.first.is_a?(Hash)
      args = args.first.dup
      [args.delete(:table), args.delete(:values) || {}, args]
    else
      [args[0], args[1] || {}, args[2] || {}]
    end

  prefix = opt[:prefix] || 'INSERT INTO'

  quoted_table = self._quote(table)
  quoted_columns = []
  columns = []
  bind_columns = []

  while true
    col, val =
      if values.is_a?(Hash)
        values.shift
      elsif values.is_a?(Array)
        values.slice!(0, 2)
      elsif values.nil?
        [nil, nil]
      else
        [values.first, nil]
      end
    break unless col
    quoted_columns += [self._quote(col)]
    if val.respond_to?(:as_sql)
      columns += [val.as_sql(nil, Proc.new {|e| self._quote(e) })]
      bind_columns += val.bind
    else
      if val.is_a?(Array) && self.strict
        croak("cannot pass in an unblessed ref as an argument in strict mode")
      end

      if val.is_a?(Array)
        # builder.insert( :foo => { :created_on => ["NOW()"] })
        # builder.insert( :foo => [ 'UNIX_TIMESTAMP(?)', '2011-04-12 00:34:12' ] )
        stmt, sub_bind = [val.first, val[1..-1]]
        columns += [stmt]
        bind_columns += sub_bind
      else
        # normal values
        columns += ['?']
        bind_columns += [val]
      end
    end
  end

  # Insert an empty record in SQLite.
  # ref. https://github.com/tokuhirom/SQL-Maker/issues/11
  if self.driver == 'sqlite' && columns.empty?
    sql  = "#{prefix} #{quoted_table}" + self.new_line + 'DEFAULT VALUES'
    return [sql, []]
  end

  sql  = "#{prefix} #{quoted_table}" + self.new_line
  sql += '(' + quoted_columns.join(', ') + ')' + self.new_line +
    'VALUES (' + columns.join(', ') + ')'

  @auto_bind ? bind_param(sql, bind_columns) : [sql, bind_columns]
end

#make_set_clause(args) ⇒ Object

make “SET” clause.



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# File 'lib/sql/maker.rb', line 167

def make_set_clause(args)
  columns = []
  bind_columns = []
  while true
    col, val =
      if args.is_a?(Hash)
        args.shift
      elsif args.is_a?(Array)
        args.slice!(0, 2)
      else
        [args, nil]
      end
    break unless col
    quoted_col = self._quote(col)
    if val.respond_to?(:as_sql)
      columns += ["#{quoted_col} = " + val.as_sql(nil, Proc.new {|label| self._quote(label) })]
      bind_columns += val.bind
    else
      if val.is_a?(Array) && self.strict
        croak("cannot pass in an unblessed ref as an argument in strict mode")
      end

      if val.is_a?(Array)
        # builder.update( :foo => [ 'NOW()' ] )
        # builder.update( :foo => [ 'VALUES(foo) + ?', 10 ] )
        stmt, sub_bind = [val.first, val[1..-1]]
        columns += ["#{quoted_col} = " + stmt]
        bind_columns += sub_bind
      else
        # normal values
        columns += ["#{quoted_col} = ?"]
        bind_columns += [val]
      end
    end
  end
  return [columns, bind_columns]
end

#new_condition ⇒ Object 



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# File 'lib/sql/maker.rb', line 37

def new_condition
  SQL::Maker::Condition.new(
    :quote_char => self.quote_char,
    :name_sep   => self.name_sep,
    :strict     => self.strict,
  )
end

#new_select(args = {}) ⇒ Object 



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# File 'lib/sql/maker.rb', line 45

def new_select(args = {})
  return self.select_class.new({
    :name_sep   => self.name_sep,
    :quote_char => self.quote_char,
    :new_line   => self.new_line,
    :strict     => self.strict,
  }.merge(args))
end

#select(*args) ⇒ Object

my(stmt, @bind) = sql−>select(table, @fields, %where, %opt)



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# File 'lib/sql/maker.rb', line 241

def select(*args)
  stmt = self.select_query(*args)

  @auto_bind ? bind_param(stmt.as_sql, stmt.bind) : [stmt.as_sql, stmt.bind]
end

#select_query(*args) ⇒ Object 



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# File 'lib/sql/maker.rb', line 247

def select_query(*args)
  table, fields, where, opt =
    if args.size == 1 and args.first.is_a?(Hash)
      args = args.first.dup
      [args.delete(:table), args.delete(:fields) || [], args.delete(:where) || {}, args]
    else
      [args[0], args[1] || [], args[2] || {}, args[3] || {}]
    end

  unless fields.is_a?(Array)
    croak("SQL::Maker::select_query: fields should be Array")
  end

  stmt = self.new_select
  fields.each do |field|
    stmt.add_select(field)
  end

  if table
    if table.is_a?(Array)
      table.each do |t|
        stmt.add_from(t)
      end
    else
      stmt.add_from( table )
    end
  end

  stmt.prefix(opt[:prefix]) if opt[:prefix]

  if where
    stmt.set_where(self._make_where_condition(where))
  end

  if joins = opt[:joins]
    joins.each do |join|
      stmt.add_join(join)
    end
  end

  if o = opt[:order_by]
    if o.is_a?(Array)
      o.each do |order|
        if order.is_a?(Hash)
          # Skinny-ish [{:foo => 'DESC'}, {:bar => 'ASC'}]
          stmt.add_order_by(order)
        else
          # just ['foo DESC', 'bar ASC']
          stmt.add_order_by(order)
        end
      end
    elsif o.is_a?(Hash)
      # Skinny-ish {:foo => 'DESC'}
      stmt.add_order_by(o)
    else
      # just 'foo DESC, bar ASC'
      stmt.add_order_by(o)
    end
  end
  if o = opt[:group_by]
    if o.is_a?(Array)
      o.each do | group|
        if group.is_a?(Hash)
          # Skinny-ish [{:foo => 'DESC'}, {:bar => 'ASC'}]
          stmt.add_group_by(group)
        else
          # just ['foo DESC', 'bar ASC']
          stmt.add_group_by(group)
        end
      end
    elsif o.is_a?(Hash)
      # Skinny-ish {:foo => 'DESC'end
      stmt.add_group_by(o)
    else
      # just 'foo DESC, bar ASC'
      stmt.add_group_by(o)
    end
  end
  if o = opt[:index_hint]
    stmt.add_index_hint(table, o)
  end

  stmt.limit(opt[:limit])    if opt[:limit]
  stmt.offset(opt[:offset])  if opt[:offset]

  if terms = opt[:having]
    term.each do |col, val|
      stmt.add_having(:col => val)
    end
  end

  stmt.for_update(1) if opt[:for_update]
  return stmt
end

#update(*args) ⇒ Object 



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# File 'lib/sql/maker.rb', line 146

def update(*args)
  table, values, where, opt =
    if args.size == 1 and args.first.is_a?(Hash)
      args = args.first.dup
      [args.delete(:table), args.delete(:set) || {}, args.delete(:where) || {}, args]
    else
      [args[0], args[1] || {}, args[2] || {}, args[3] || {}]
    end

  columns, bind_columns = self.make_set_clause(values)

  w = self._make_where_clause(where)
  bind_columns += array_wrap(w[1])

  quoted_table = self._quote(table)
  sql = "UPDATE #{quoted_table} SET " + columns.join(', ') + w[0]

  @auto_bind ? bind_param(sql, bind_columns) : [sql, bind_columns]
end

#where(where) ⇒ Object 



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# File 'lib/sql/maker.rb', line 205

def where(where)
  cond = self._make_where_condition(where)
  return [cond.as_sql, cond.bind]
end