DBD::XBase(3)						User Contributed Perl Documentation					     DBD::XBase(3)

NAME

       DBD::XBase - DBI driver for XBase compatible database files

SYNOPSIS

	   use DBI;
	   my $dbh = DBI->connect("DBI:XBase:/directory/subdir")
				       or die $DBI::errstr;
	   my $sth = $dbh->prepare("select MSG from test where ID != 1")
				       or die $dbh->errstr();
	   $sth->execute() or die $sth->errstr();

	   my @data;
	   while (@data = $sth->fetchrow_array())
		       { ## further processing }

	   $dbh->do('update table set name = ? where id = 45', {}, 'krtek');

DESCRIPTION

       DBI compliant driver for module XBase. Please refer to DBI(3) documentation for how to actually use the module. In the connect call,
       specify the directory containing the dbf files (and other, memo, etc.) as the third part of the connect string. It defaults to the current
       directory.

       Note that with dbf, there is no database server that the driver would talk to. This DBD::XBase calls methods from XBase.pm module to read
       and write the files on the disk directly, so any limitations and features of XBase.pm apply to DBD::XBase as well. DBD::XBase basically
       adds SQL, DBI compliant interface to XBase.pm.

       The DBD::XBase doesn't make use of index files at the moment. If you really need indexed access, check XBase(3) for notes about support for
       variour index types.

SUPPORTED SQL COMMANDS

       The SQL commands currently supported by DBD::XBase's prepare are:

   select
	   select fields_or_expressions from table [ where condition ]
					       [ order by field ]

       Fields_or_expressions is a comma separated list of fields or arithmetic expressions, or a "*" for all fields from the table. The "where"
       condition specifies which rows will be returned, you can have arbitrary arithmetic and boolean expression here, compare fields and
       constants and use "and" and "or". Match using "like" is also supported. Examples:

	   select * from salaries where name = "Smith"
	   select first,last from people where login = "ftp"
						       or uid = 1324
	   select id,first_name,last_name from employ
		       where last_name like 'Ki%' order by last_name
	   select id + 1, substr(name, 1, 10) from employ where age > 65
	   select id, name from employ where id = ?

       You can use bind parameters in the where clause, as the last example shows. The actual value has to be supplied via bind_param or in the
       call to execute or do, see DBI(3) for details. To check for NULL values in the "where" expression, use "id is null" and "id is not null",
       not "id == null".

       Please note that you can only select from one table, joins are not supported and are not planned to be supported. If you need them, get a
       real RDBMS (or send me a patch).

       In the arithmetic expressions you can use a couple of SQL functions -- currently supported are concat, substr (and substring), trim, ltrim
       and rtrim, length. I do not have an exact idea of which and how many functions I want to support. It's easy to write them in a couple of
       minutes now the interface is there (check the XBase::SQL module if you want to send a patch containing support for more), it's just that I
       do not really need them and sometimes it's hard to tell what is usefull and what is SQL92 compatible. Comment welcome.

       The select command may contain and order by clause. Only one column is supported for sorting at the moment, patches are welcome.

       The group by clause is not supported (and I do not plan them), nor are the aggregate functions.

   delete
	   delete from table [ where condition ]

       The "where" condition is the same as for select. Examples:

	   delete from jobs	       ## emties the table
	   delete from jobs where companyid = "ISW"
	   delete from jobs where id < ?

   insert
	   insert into table [ ( fields ) ] values ( list of values )

       Here fields is a (optional) comma separated list of fields to set, list of values is a list of constants to assign. If the fields are not
       specified, sets the fields in the natural order of the table.  You can use bind parameters in the list of values. Examples:

	   insert into accounts (login, uid) values ("guest", 65534)
	   insert into accounts (login, uid) values (?, ?)
	   insert into passwd values ("user","*",4523,100,"Nice user",
				       "/home/user","/bin/bash")

   update
	   update table set field = new value [ , set more fields ]
					       [ where condition ]

       Example:

	   update passwd set uid = 65534 where login = "guest"
	   update zvirata set name = "Jezek", age = 4 where id = 17

       Again, the value can also be specified as bind parameter.

	   update zvirata set name = ?, age = ? where id = ?

   create table
	   create table table name ( columns specification )

       Columns specification is a comma separated list of column names and types. Example:

	   create table rooms ( roomid int, cat char(10), balcony boolean )

       The allowed types are

	   char num numeric int integer float boolean blob memo date time
	   datetime

       Some of them are synonyms. They are of course converted to appropriate XBase types.

   drop table
	   drop table table name

       Example:

	   drop table passwd

ATTRIBUTES

       Besides standard DBI attribudes, DBD::XBase supports database handle attribute xbase_ignorememo:

	       $dbh->{'xbase_ignorememo'} = 1;

       Setting it to 1 will cause subsequent tables to be opened while ignoring the memo files (dbt, fpt). So you can read dbf files for which you
       don't have (you have lost them, for example) the memo files.  The memo fields will come out as nulls.

VERSION

       0.240

AUTHOR

       (c) 1997--2003 Jan Pazdziora, adelton@fi.muni.cz, http://www.fi.muni.cz/~adelton/ at Faculty of Informatics, Masaryk University in Brno,
       Czech Republic

SEE ALSO

       perl(1); DBI(3), XBase(3); dbish(1)

       Translation into Japanese (older version) at http://member.nifty.ne.jp/hippo2000/perltips/DBD/XBase.htm by Kawai Takanori.

perl v5.12.1							    2003-11-21							     DBD::XBase(3)