MySQL数据库

开发平台：

Visual C++

func_compress.test：源码内容

							-- source include/have_compress.inc
#
# Test for compress and uncompress functions:
#
select @test_compress_string:='string for test compress function aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa ';
select length(@test_compress_string);
select uncompress(compress(@test_compress_string));
explain extended select uncompress(compress(@test_compress_string));
select uncompressed_length(compress(@test_compress_string))=length(@test_compress_string);
explain extended select uncompressed_length(compress(@test_compress_string))=length(@test_compress_string);
select uncompressed_length(compress(@test_compress_string));
select length(compress(@test_compress_string))<length(@test_compress_string);
create table t1 (a text, b char(255), c char(4)) engine=myisam;
insert into t1 (a,b,c) values (compress(@test_compress_string),compress(@test_compress_string),'d ');
select uncompress(a) from t1;
select uncompress(b) from t1;
select concat('|',c,'|') from t1;
drop table t1;
select compress("");
select uncompress("");
select uncompress(compress(""));
select uncompressed_length("");
#
# errors
#
create table t1 (a text);
insert t1 values (compress(null)), ('ABBBBBBBB'), (compress(space(50000))), (space(50000));
select length(a) from t1;
select length(uncompress(a)) from t1;
drop table t1;
#
# Bug #5497: a problem with large strings
# note that when LOW_MEMORY is set the "test" below is meaningless
#
set @@max_allowed_packet=1048576*100;
--replace_result "''" XXX "'1'" XXX
eval select compress(repeat('aaaaaaaaaa', IF('$LOW_MEMORY', 10, 10000000))) is null;
# End of 4.1 tests

						