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194 lines
6.8 KiB
HTML
194 lines
6.8 KiB
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<HTML>
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<HEAD>
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<TITLE>my2pg - MySQL -> PostgreSQL dump conversion utility.</TITLE>
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<LINK REV="made" HREF="mailto:bhcompile@daffy.perf.redhat.com">
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</HEAD>
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<BODY>
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<A NAME="__index__"></A>
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<!-- INDEX BEGIN -->
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<UL>
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<LI><A HREF="#name">NAME</A></LI>
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<LI><A HREF="#syntax">SYNTAX</A></LI>
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<LI><A HREF="#overview">OVERVIEW</A></LI>
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<LI><A HREF="#commandline options">COMMAND-LINE OPTIONS</A></LI>
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<LI><A HREF="#side effects">SIDE EFFECTS</A></LI>
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<LI><A HREF="#bugs">BUGS</A></LI>
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<LI><A HREF="#authors">AUTHORS</A></LI>
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<LI><A HREF="#credits">CREDITS</A></LI>
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<LI><A HREF="#license">LICENSE</A></LI>
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</UL>
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<!-- INDEX END -->
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<HR>
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<P>
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<H1><A NAME="name">NAME</A></H1>
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<P>my2pg - MySQL -> PostgreSQL dump conversion utility.</P>
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<P>
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<HR>
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<H1><A NAME="syntax">SYNTAX</A></H1>
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<PRE>
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mysqldump db | ./my2pg.pl [-nds] > pgsqldump.sql
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vi libtypes.c
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make
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psql database < pgsqldump.txt
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where</PRE>
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<DL>
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<DT><STRONG><A NAME="item_pgsqldump%2Esql"><EM>pgsqldump.sql</EM></A></STRONG><BR>
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<DD>
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- file suitable for loading into PostgreSQL.
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<P></P>
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<DT><STRONG><A NAME="item_libtypes%2Ec"><EM>libtypes.c</EM></A></STRONG><BR>
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<DD>
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- C source for emulated MySQL types (ENUM, SET) generated by <STRONG>my2pg</STRONG>
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<P></P></DL>
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<P>
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<HR>
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<H1><A NAME="overview">OVERVIEW</A></H1>
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<P><STRONG>my2pg</STRONG> utility attempts to convert MySQL database dump to Postgres's one.
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<STRONG>my2pg</STRONG> performs such conversions:</P>
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<UL>
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<LI><STRONG><A NAME="item_Type_conversion%2E">Type conversion.</A></STRONG><BR>
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It tries to find proper Postgres
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type for each column.
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Unknown types are silently pushing to output dump;
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ENUM and SET types implemented via user types
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(C source for such types can be found in
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<STRONG>libtypes.c</STRONG> file);
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<P></P>
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<LI><STRONG><A NAME="item_Encloses_identifiers_into_double_quotes%2E">Encloses identifiers into double quotes.</A></STRONG><BR>
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All column and table
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names should be enclosed to double-quotes to prevent
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conflict with reserved SQL keywords;
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<P></P>
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<LI><STRONG><A NAME="item_Converting">Converting</A></STRONG><BR>
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AUTO_INCREMENT fields to SERIAL. Actually, creating the sequence and
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setting default value to nextval('seq'), well, you know :)
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<P></P>
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<LI><STRONG>Converting</STRONG><BR>
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<CODE>KEY(field)</CODE> to CREATE INDEX i_field on table (field);
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<P></P>
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<LI><STRONG><A NAME="item_The_same">The same</A></STRONG><BR>
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for UNIQUE keys;
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<P></P>
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<LI><STRONG><A NAME="item_Indices">Indices</A></STRONG><BR>
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are creating AFTER rows insertion (to speed up the load);
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<P></P>
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<LI><STRONG><A NAME="item_Translates_%27%23%27">Translates '#'</A></STRONG><BR>
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MySQL comments to ANSI SQL '--'
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<P></P></UL>
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<P>It encloses dump in transaction block to prevent single errors
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during data load.</P>
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<P>
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<HR>
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<H1><A NAME="commandline options">COMMAND-LINE OPTIONS</A></H1>
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<P>My2pg takes the following command-line options:</P>
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<DL>
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<DT><STRONG><A NAME="item_%2Dn">-n</A></STRONG><BR>
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<DD>
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Convert *CHAR DEFAULT '' NOT NULL types to *CHAR NULL.
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Postgres can't load empty '' strings in NOT NULL fields.
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<P></P>
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<DT><STRONG><A NAME="item_%2Dd">-d</A></STRONG><BR>
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<DD>
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Add double quotes around table and column names
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<P></P>
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<DT><STRONG><A NAME="item_%2Dh">-h</A></STRONG><BR>
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<DD>
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Show usage banner.
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<P></P>
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<DT><STRONG><A NAME="item_%2Ds">-s</A></STRONG><BR>
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<DD>
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Do not attempt to convert data. Currently my2pg only tries to convert
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date and time data.
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<P></P></DL>
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<P>
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<HR>
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<H1><A NAME="side effects">SIDE EFFECTS</A></H1>
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<UL>
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<LI><STRONG><A NAME="item_creates">creates</A></STRONG><BR>
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file <STRONG>libtypes.c</STRONG> in current directory
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overwriting existed file without any checks;
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<P></P>
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<LI><STRONG><A NAME="item_the_same">the same</A></STRONG><BR>
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for Makefile.
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<P></P></UL>
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<P>
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<HR>
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<H1><A NAME="bugs">BUGS</A></H1>
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<P>Known bugs are:</P>
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<UL>
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<LI><STRONG><A NAME="item_Possible_problems_with_the_timestamp_data%2E">Possible problems with the timestamp data.</A></STRONG><BR>
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PostgreSQL does not accept incorrect date/time values like <STRONG>2002-00-15</STRONG>,
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while MySQL does not care about that. Currently my2pg cannot handle this
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issue. You should care yourself to convert such a data.
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<P></P>
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<LI><STRONG><A NAME="item_Use_%2Ds_option_if_your_numeric_data_are_broken_du">Use -s option if your numeric data are broken during conversion.</A></STRONG><BR>
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My2pg attempts to convert MySQL timestamps of the form <STRONG>yyyymmdd</STRONG> to
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<STRONG>yyyy-mm-dd</STRONG> and <STRONG>yyyymmddhhmmss</STRONG> to <STRONG>yyyy-mm-dd hh:mm:ss</STRONG>. It performs
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some heuristic checks to ensure that the month,day,hour,minutes and seconds have
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values from the correct range (0..12, 0..31, 0..23, 0..59, 0..59 respectively).
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It is still possible that your numeric values that satisfy these conditions
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will get broken.
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<P></P>
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<LI><STRONG><A NAME="item_Possible_problems_with_enclosing_identifiers_in_do">Possible problems with enclosing identifiers in double quotes.</A></STRONG><BR>
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All identifiers such as table and column names should be enclosed in double
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quotes. Program can't handle upper-case identifiers,
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like DBA. Lower-case identifiers are OK.
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<P></P>
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<LI><STRONG><A NAME="item_SET_type_emulation_is_not_full%2E_LIKE_operation_o">SET type emulation is not full. LIKE operation on</A></STRONG><BR>
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SETs, raw integer input values should be implemented
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<P></P>
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<LI><STRONG><A NAME="item_Makefile"><STRONG>Makefile</STRONG></A></STRONG><BR>
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generated during output is
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platform-dependent and surely works only on
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Linux/gcc (FreeBSD/gcc probably works as well - not tested)
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<P></P>
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<LI><STRONG><A NAME="item_Generated_libtypes%2Ec_contain_line">Generated <STRONG>libtypes.c</STRONG> contain line</A></STRONG><BR>
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<PRE>
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#include <postgres.h></PRE>
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<P>This file may be located not in standard compiler
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include path, you need to check it before compiling.</P>
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</UL>
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<P>
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<HR>
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<H1><A NAME="authors">AUTHORS</A></H1>
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<P><STRONG>(c) 2000-2002 Maxim V. Rudensky (<A HREF="mailto:fonin@omnistaronline.com">fonin@ziet.zhitomir.ua</A>)</STRONG> (developer, maintainer)</P>
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<P><STRONG>(c) 2000 Valentine V. Danilchuk (<A HREF="mailto:valdan@ziet.zhitomir.ua">valdan@ziet.zhitomir.ua</A>)</STRONG> (original script)</P>
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<P>
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<HR>
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<H1><A NAME="credits">CREDITS</A></H1>
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<P>Great thanks to all those people who provided feedback and make development
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of this tool easier.</P>
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<P>Jeff Waugh <<A HREF="mailto:jaw@ic.net">jaw@ic.net</A>></P>
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<P>Joakim Lemstr<74>m <<A HREF="mailto:jocke@bytewize.com">jocke@bytewize.com</A>> || <<A HREF="mailto:buddyh19@hotmail.com">buddyh19@hotmail.com</A>></P>
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<P>Yunliang Yu <<A HREF="mailto:yu@math.duke.edu">yu@math.duke.edu</A>></P>
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<P>Brad Hilton <<A HREF="mailto:bhilton@vpop.net">bhilton@vpop.net</A>></P>
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<P>If you are not listed here please write to me.</P>
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<P>
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<HR>
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<H1><A NAME="license">LICENSE</A></H1>
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<P><STRONG>BSD</STRONG></P>
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</BODY>
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</HTML>
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