Commit 8a99997d authored by unknown's avatar unknown
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Additional storage engine called "blackhole". Customer request, and for that... 

Additional storage engine called "blackhole". Customer request, and for that matter a Zawodny request.  With this you can alter table to a type of table that would never store data. Its a /dev/null for a database.  


acinclude.m4:
  New macro rule for ha_blackhole.
configure.in:
  Rule enabling blackhole engine
sql/Makefile.am:
  Additions to Makefile for blackhole engine
sql/handler.cc:
  Ifdef enable code for blackhole (and message for "what does this thing do").
sql/handler.h:
  Flag for storage engine type.
sql/mysql_priv.h:
  Added blackhole type.
sql/mysqld.cc:
  Updates for building backhole.
sql/set_var.cc:
  Show variable for blackhole engine
parent 5b32b8e1

acinclude.m4

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Original line number Diff line number Diff line
@@ -1510,6 +1510,36 @@ dnl --------------------------------------------------------------------------- 
dnl END OF MYSQL_CHECK_EXAMPLE SECTION

dnl ---------------------------------------------------------------------------



dnl ---------------------------------------------------------------------------

dnl Macro: MYSQL_CHECK_BLACKHOLEDB

dnl Sets HAVE_BLACKHOLE_DB if --with-blackhole-storage-engine is used

dnl ---------------------------------------------------------------------------

AC_DEFUN([MYSQL_CHECK_BLACKHOLEDB], [

  AC_ARG_WITH([blackhole-storage-engine],

              [

  --with-blackhole-storage-engine

                          Enable the Blackhole Storage Engine],

              [blackholedb="$withval"],

              [blackholedb=no])

  AC_MSG_CHECKING([for blackhole storage engine])



  case "$blackholedb" in

    yes )

      AC_DEFINE([HAVE_BLACKHOLE_DB], [1], [Builds Blackhole DB])

      AC_MSG_RESULT([yes])

      [blackholedb=yes]

      ;;

    * )

      AC_MSG_RESULT([no])

      [blackholedb=no]

      ;;

  esac



])

dnl ---------------------------------------------------------------------------

dnl END OF MYSQL_CHECK_BLACKHOLE SECTION

dnl ---------------------------------------------------------------------------



dnl ---------------------------------------------------------------------------

dnl Macro: MYSQL_CHECK_ARCHIVEDB

dnl Sets HAVE_ARCHIVE_DB if --with-archive-storage-engine is used

configure.in

+1 −0
Original line number Diff line number Diff line
@@ -2835,6 +2835,7 @@ MYSQL_CHECK_INNODB 
MYSQL_CHECK_EXAMPLEDB

MYSQL_CHECK_ARCHIVEDB

MYSQL_CHECK_CSVDB

MYSQL_CHECK_BLACKHOLEDB

MYSQL_CHECK_NDBCLUSTER



# If we have threads generate some library functions and test programs

mysql-test/include/have_blackhole.inc

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-- require r/have_blackhole.require

disable_query_log;

show variables like "have_blackhole_engine";

enable_query_log;

mysql-test/r/blackhole.result

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drop table if exists t1,t2;

CREATE TABLE t1 (

Period smallint(4) unsigned zerofill DEFAULT '0000' NOT NULL,

Varor_period smallint(4) unsigned DEFAULT '0' NOT NULL

) ENGINE=blackhole;

INSERT INTO t1 VALUES (9410,9412);

select period from t1;

period

select * from t1;

Period	Varor_period

select t1.* from t1;

Period	Varor_period

CREATE TABLE t2 (

auto int NOT NULL auto_increment,

fld1 int(6) unsigned zerofill DEFAULT '000000' NOT NULL,

companynr tinyint(2) unsigned zerofill DEFAULT '00' NOT NULL,

fld3 char(30) DEFAULT '' NOT NULL,

fld4 char(35) DEFAULT '' NOT NULL,

fld5 char(35) DEFAULT '' NOT NULL,

fld6 char(4) DEFAULT '' NOT NULL,

primary key (auto)

) ENGINE=blackhole;

select t2.fld3 from t2 where companynr = 58 and fld3 like "%imaginable%";

fld3

select fld3 from t2 where fld3 like "%cultivation" ;

fld3

select t2.fld3,companynr from t2 where companynr = 57+1 order by fld3;

fld3	companynr

select fld3,companynr from t2 where companynr = 58 order by fld3;

fld3	companynr

select fld3 from t2 order by fld3 desc limit 10;

fld3

select fld3 from t2 order by fld3 desc limit 5;

fld3

select fld3 from t2 order by fld3 desc limit 5,5;

fld3

select t2.fld3 from t2 where fld3 = 'honeysuckle';

fld3

select t2.fld3 from t2 where fld3 LIKE 'honeysuckl_';

fld3

select t2.fld3 from t2 where fld3 LIKE 'hon_ysuckl_';

fld3

select t2.fld3 from t2 where fld3 LIKE 'honeysuckle%';

fld3

select t2.fld3 from t2 where fld3 LIKE 'h%le';

fld3

select t2.fld3 from t2 where fld3 LIKE 'honeysuckle_';

fld3

select t2.fld3 from t2 where fld3 LIKE 'don_t_find_me_please%';

fld3

select t2.fld3 from t2 where fld3 >= 'honeysuckle' and fld3 <= 'honoring' order by fld3;

fld3

select fld1,fld3 from t2 where fld3="Colombo" or fld3 = "nondecreasing" order by fld3;

fld1	fld3

DROP TABLE t1;

CREATE TABLE t1 (a VARCHAR(200), b TEXT, FULLTEXT (a,b));

INSERT INTO t1 VALUES('MySQL has now support', 'for full-text search'),

('Full-text indexes', 'are called collections'),

('Only MyISAM tables','support collections'),

('Function MATCH ... AGAINST()','is used to do a search'),

('Full-text search in MySQL', 'implements vector space model');

SHOW INDEX FROM t1;

Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment

t1	1	a	1	a	NULL	NULL	NULL	NULL	YES	FULLTEXT	

t1	1	a	2	b	NULL	NULL	NULL	NULL	YES	FULLTEXT	

select * from t1 where MATCH(a,b) AGAINST ("collections");

a	b

Only MyISAM tables	support collections

Full-text indexes	are called collections

explain extended select * from t1 where MATCH(a,b) AGAINST ("collections");

id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra

1	SIMPLE	t1	fulltext	a	a	0		1	Using where

Warnings:

Note	1003	select test.t1.a AS `a`,test.t1.b AS `b` from test.t1 where (match test.t1.a,test.t1.b against (_latin1'collections'))

select * from t1 where MATCH(a,b) AGAINST ("indexes");

a	b

Full-text indexes	are called collections

select * from t1 where MATCH(a,b) AGAINST ("indexes collections");

a	b

Full-text indexes	are called collections

Only MyISAM tables	support collections

select * from t1 where MATCH(a,b) AGAINST ("only");

a	b

mysql-test/r/have_blackhole.require

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Variable_name	Value

have_blackhole_engine	YES