sqlt-diff - find the differences b/w two schemas


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=parser1 file_name2=parser2


  -d|--debug   Show debugging info
  -t|--trace   Turn on tracing for Parse::RecDescent
  -c|--case-insensitive   Compare tables/columns case-insensitively
  --ignore-index-names    Ignore index name differences
  --ignore-constraint-names   Ignore constraint name differences
  --mysql_parser_version=<#####> Specify a target MySQL parser version
                                 for dealing with /*! comments
  --output-db=<Producer>  This Producer will be used instead of one
                          corresponding to parser1 to format output
                          for new tables
  --ignore-view-sql    Ignore view SQL differences
  --ignore-proc-sql    Ignore procedure SQL differences
  --no-batch-alters    Do not clump multile alters to the same table into a
                       single ALTER TABLE statement where possible.


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, CREATE, DROP statements are created by SQL::Translator::Producer::*, see there for support/problems.

Currently (v0.0900), only MySQL is supported by this code.


Ken Youens-Clark <>.