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.\" ========================================================================
.\"
.IX Title "SQLT-DIFF-OLD 1p"
.TH SQLT-DIFF-OLD 1p "2022-11-19" "perl v5.36.0" "User Contributed Perl Documentation"
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.SH "NAME"
sqlt\-diff \- find the differences b/w two schemas
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
For help:
.PP
.Vb 1
\&  sqlt\-diff \-h|\-\-help
.Ve
.PP
For a list of all valid parsers:
.PP
.Vb 1
\&  sqlt \-l|\-\-list
.Ve
.PP
To diff two schemas:
.PP
.Vb 1
\&  sqlt\-diff [options] file_name1=parser file_name2=parser
.Ve
.PP
Options:
.PP
.Vb 1
\&  \-d|\-\-debug   Show debugging info
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
sqlt-diff is a utility for creating a file of \s-1SQL\s0 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
.IP "\(bu" 4
New tables
.Sp
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).
.IP "\(bu" 4
Missing/altered fields
.Sp
Any fields missing or altered between the two schemas will be reported
as:
.Sp
.Vb 3
\&  ALTER TABLE <table_name>
\&    [DROP <field_name>]
\&    [CHANGE <field_name> <datatype> (<size>)] ;
.Ve
.IP "\(bu" 4
Missing/altered indices
.Sp
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:
.Sp
.Vb 1
\&  DROP INDEX <index_name> ON <table_name> ;
.Ve
.Sp
An index of a different type or on different fields will be reported as a
new index as such:
.Sp
.Vb 2
\&  CREATE [<index_type>] INDEX [<index_name>] ON <table_name>
\&    ( <field_name>[,<field_name>] ) ;
.Ve
.PP
\&\*(L"\s-1ALTER/DROP TABLE\*(R"\s0 and \*(L"\s-1CREATE INDEX\*(R"\s0 statements \fBare not\fR generated by
the Producer, unfortunately, and may require massaging before being passed to
your target database.
.SH "AUTHOR"
.IX Header "AUTHOR"
Ken Youens-Clark <kclark@cpan.org>.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
SQL::Translator, <http://sqlfairy.sourceforge.net>.