Module: SQL::Maker::Quoting

Defined in:
lib/sql/maker/quoting.rb

Class Method Summary collapse

Class Method Details

.quote(value, column = nil) ⇒ Object

Quotes the value rather than column name to help prevent SQL injection attacks.



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# File 'lib/sql/maker/quoting.rb', line 7

def self.quote(value, column = nil)
  case value
  when String
    value = value.to_s
    return "'#{quote_string(value)}'" unless column

    case column.type
    when :integer then value.to_i.to_s
    when :float then value.to_f.to_s
    else
      "'#{quote_string(value)}'"
    end

  when true, false
    if column && column.type == :integer
      value ? '1' : '0'
    else
      value ? quoted_true : quoted_false
    end
    # BigDecimals need to be put in a non-normalized form and quoted.
  when nil        then "NULL"
  when BigDecimal then value.to_s('F')
  when Numeric    then value.to_s
  when Date, Time then "'#{quoted_date(value)}'"
  when Symbol     then "'#{quote_string(value.to_s)}'"
  when Class      then "'#{value.to_s}'"
  else
    "'#{quote_string(YAML.dump(value))}'"
  end
end

.quote_column_name(column_name) ⇒ Object

Quotes the column name. Defaults to no quoting.



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# File 'lib/sql/maker/quoting.rb', line 102

def self.quote_column_name(column_name)
  column_name
end

.quote_string(s) ⇒ Object

Quotes a string, escaping any ‘ (single quote) and \ (backslash) characters.



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# File 'lib/sql/maker/quoting.rb', line 76

def self.quote_string(s)
  s.gsub(/\\/, '\&\&').gsub(/'/, "''") # ' (for ruby-mode)
end

.quote_table_name(table_name) ⇒ Object

Quotes the table name. Defaults to column name quoting.



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# File 'lib/sql/maker/quoting.rb', line 107

def self.quote_table_name(table_name)
  quote_column_name(table_name)
end

.quote_table_name_for_assignment(table, attr) ⇒ Object

Override to return the quoted table name for assignment. Defaults to table quoting.

This works for mysql and mysql2 where table.column can be used to resolve ambiguity.

We override this in the sqlite and postgresql adapters to use only the column name (as per syntax requirements).



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

def self.quote_table_name_for_assignment(table, attr)
  quote_table_name("#{table}.#{attr}")
end

.quoted_date(value) ⇒ Object 



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# File 'lib/sql/maker/quoting.rb', line 131

def self.quoted_date(value)
  if value.is_a?(Time)
    # ToDo: getutc support
    value = value.getlocal
  end
  value.strftime("%Y-%m-%d %H:%M:%S") 
end

.quoted_false ⇒ Object 



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# File 'lib/sql/maker/quoting.rb', line 127

def self.quoted_false
  "'f'"
end

.quoted_true ⇒ Object 



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

def self.quoted_true
  "'t'"
end

.type_cast(value, column) ⇒ Object

Cast a value to a type that the database understands. For example, SQLite does not understand dates, so this method will convert a Date to a String.



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# File 'lib/sql/maker/quoting.rb', line 41

def self.type_cast(value, column)
  return value.id if value.respond_to?(:quoted_id)

  case value
  when String
    value = value.to_s
    return value unless column

    case column.type
    when :integer then value.to_i
    when :float then value.to_f
    else
      value
    end

  when true, false
    if column && column.type == :integer
      value ? 1 : 0
    else
      value ? 't' : 'f'
    end
    # BigDecimals need to be put in a non-normalized form and quoted.
  when nil        then nil
  when BigDecimal then value.to_s('F')
  when Numeric    then value
  when Date, Time then quoted_date(value)
  when Symbol     then value.to_s
  else
    to_type = column ? " to #{column.type}" : ""
    raise TypeError, "can't cast #{value.class}#{to_type}"
  end
end