Class: SQLExporter

Inherits:
Object
  • Object
show all
Defined in:
lib/sqlexporter.rb

Overview

This class implements the interface for exprting SQLConstructor objects to strings.

Defined Under Namespace

Classes: Exporter_generic, Exporter_mysql

Constant Summary collapse

DEFAULT_DIALECT =

defaults to ‘mysql’

'mysql'

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(dialect = DEFAULT_DIALECT, tidy = false) ⇒ SQLExporter

Class constructor. Called with two optional arguments - dialect and tidy.

Dialect determines the translator class (e.g., Exporter_mysql, 
Exporter_informix etc). Tidy determines whether the output should be
formatted and human-readable.



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# File 'lib/sqlexporter.rb', line 19

def initialize ( dialect = DEFAULT_DIALECT, tidy = false )
    dialect ||= DEFAULT_DIALECT
    dialect_class = "Exporter_" + dialect.to_s
    begin
        @translator = SQLExporter.const_get( dialect_class ).new( tidy )
    rescue
        raise NameError, ERR_UNKNOWN_DIALECT + ": " + dialect.to_s
    end
    @dialect, @tidy = dialect, tidy
    @separator = @translator.separator
end

Instance Attribute Details

#dialect ⇒ Object

Returns the value of attribute dialect.



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# File 'lib/sqlexporter.rb', line 7

def dialect
  @dialect
end

#separator ⇒ Object (readonly)

Returns the value of attribute separator.



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# File 'lib/sqlexporter.rb', line 8

def separator
  @separator
end

#tidy ⇒ Object

Returns the value of attribute tidy.



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# File 'lib/sqlexporter.rb', line 7

def tidy
  @tidy
end

Instance Method Details

#export(obj) ⇒ Object

The main method to export the obj to string. Calls the @translator’s

export method.



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# File 'lib/sqlexporter.rb', line 35

def export ( obj )
    string = @translator.export obj
    string = @separator + "(" + string + ")"  if obj.inline
    return string
end