Class: DBLeftovers::GenericDatabaseInterface

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

Instance Method Summary collapse

Instance Method Details

#execute_add_constraint(chk) ⇒ Object 



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# File 'lib/db_leftovers/generic_database_interface.rb', line 53

def execute_add_constraint(chk)
  sql = "      ALTER TABLE \#{chk.on_table} ADD CONSTRAINT \#{chk.constraint_name} CHECK (\#{chk.check})\n  EOQ\n  execute_sql sql\nend\n"

#execute_add_foreign_key(fk) ⇒ Object 



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# File 'lib/db_leftovers/generic_database_interface.rb', line 39

def execute_add_foreign_key(fk)
  on_delete = "ON DELETE CASCADE" if fk.cascade
  on_delete = "ON DELETE SET NULL" if fk.set_null
  execute_sql %{ALTER TABLE #{fk.from_table}
            ADD CONSTRAINT #{fk.constraint_name}
            FOREIGN KEY (#{fk.from_column})
            REFERENCES #{fk.to_table} (#{fk.to_column})
            #{on_delete}}
end

#execute_add_index(idx) ⇒ Object 



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# File 'lib/db_leftovers/generic_database_interface.rb', line 17

def execute_add_index(idx)
  unique = idx.unique? ? 'UNIQUE' : ''
  where = idx.where_clause.present? ? "WHERE #{idx.where_clause}" : ''
  using = idx.using_clause.present? ? "USING #{idx.using_clause}" : ''

  sql = "    CREATE \#{unique} INDEX \#{idx.index_name}\n    ON \#{idx.table_name}\n    \#{using}\n    (\#{idx.index_function || idx.column_names.join(', ')})\n    \#{where}\n  EOQ\n  execute_sql(sql)\nend\n"

#execute_drop_constraint(constraint_name, on_table) ⇒ Object 



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# File 'lib/db_leftovers/generic_database_interface.rb', line 60

def execute_drop_constraint(constraint_name, on_table)
  execute_sql %{ALTER TABLE #{on_table} DROP CONSTRAINT #{constraint_name}}
end

#execute_drop_foreign_key(constraint_name, from_table, from_column) ⇒ Object 



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# File 'lib/db_leftovers/generic_database_interface.rb', line 49

def execute_drop_foreign_key(constraint_name, from_table, from_column)
  execute_sql %{ALTER TABLE #{from_table} DROP CONSTRAINT #{constraint_name}}
end

#execute_drop_index(table_name, index_name) ⇒ Object 



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# File 'lib/db_leftovers/generic_database_interface.rb', line 32

def execute_drop_index(table_name, index_name)
  sql = "      DROP INDEX \#{index_name}\n  EOQ\n  execute_sql(sql)\nend\n"

#execute_sql(sql) ⇒ Object 



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# File 'lib/db_leftovers/generic_database_interface.rb', line 64

def execute_sql(sql)
  @conn.execute(sql)
end

#lookup_all_constraints ⇒ Object 



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# File 'lib/db_leftovers/generic_database_interface.rb', line 13

def lookup_all_constraints
  raise "Should be overriden by a database-specific interface"
end

#lookup_all_foreign_keys ⇒ Object 



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# File 'lib/db_leftovers/generic_database_interface.rb', line 9

def lookup_all_foreign_keys
  raise "Should be overriden by a database-specific interface"
end

#lookup_all_indexes ⇒ Object 



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# File 'lib/db_leftovers/generic_database_interface.rb', line 5

def lookup_all_indexes
  raise "Should be overriden by a database-specific interface"
end