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.\" ========================================================================
.\"
.IX Title "SQLT-DIFF 1p"
.TH SQLT-DIFF 1p "2020-09-18" "perl v5.30.3" "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=parser1 file_name2=parser2
.Ve
.PP
Options:
.PP
.Vb 10
\&  \-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.
\&  \-\-quote=<character>  Use <character> to quote all table and field
\&                       names in statements
.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
\&\s-1ALTER, CREATE, DROP\s0 statements are created by
SQL::Translator::Producer::*, see there for support/problems.
.PP
Currently (v0.0900), only MySQL is supported by this code.
.SH "AUTHOR"
.IX Header "AUTHOR"
Ken Youens-Clark <kclark@cpan.org>.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
SQL::Translator, <http://sqlfairy.sourceforge.net>.