SYNOPSIS

For help:

sqlt-diff -h|--help

For a list of all valid parsers:

  sqlt -l|--list

To diff two schemas:

  sqlt-diff [options] file_name1=parser file_name2=parser

Options:

  -d|--debug   Show debugging info

DESCRIPTION

sqlt-diff is a utility for creating a file of SQL commands necessary to transform the first schema provided to the second. While not yet exhaustive in its ability to mutate the entire schema, it will report the following

• New tables

  Using the Producer class of the target (second) schema, any tables missing in the first schema will be generated in their entirety (fields, constraints, indices).

• Missing/altered fields

  Any fields missing or altered between the two schemas will be reported as:

    ALTER TABLE <table_name>
      [DROP <field_name>]
      [CHANGE <field_name> <datatype> (<size>)] ;
  

• Missing/altered indices

  Any indices missing or of a different type or on different fields will be indicated. Indices that should be dropped will be reported as such:

    DROP INDEX <index_name> ON <table_name> ;
  

  An index of a different type or on different fields will be reported as a new index as such:

    CREATE [<index_type>] INDEX [<index_name>] ON <table_name>
      ( <field_name>[,<field_name>] ) ;
  

``ALTER/DROP TABLE'' and ``CREATE INDEX'' statements are not generated by the Producer, unfortunately, and may require massaging before being passed to your target database.

AUTHOR

Ken Youens-Clark <[email protected]>.