2003-04-09 20:50:30 -04:00
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select @test_compress_string:='string for test compress function aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa ';
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@test_compress_string:='string for test compress function aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa '
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string for test compress function aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
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select length(@test_compress_string);
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length(@test_compress_string)
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117
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select uncompress(compress(@test_compress_string));
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uncompress(compress(@test_compress_string))
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string for test compress function aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
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2003-10-30 12:57:26 +02:00
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explain extended select uncompress(compress(@test_compress_string));
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL No tables used
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Warnings:
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Note 1003 select high_priority no_cache uncompress(compress((@test_compress_string))) AS `uncompress(compress(@test_compress_string))`
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2003-04-09 20:50:30 -04:00
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select uncompressed_length(compress(@test_compress_string))=length(@test_compress_string);
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uncompressed_length(compress(@test_compress_string))=length(@test_compress_string)
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1
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2003-10-30 12:57:26 +02:00
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explain extended select uncompressed_length(compress(@test_compress_string))=length(@test_compress_string);
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL No tables used
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Warnings:
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Note 1003 select high_priority no_cache (uncompressed_length(compress((@test_compress_string))) = length((@test_compress_string))) AS `uncompressed_length(compress(@test_compress_string))=length(@test_compress_string)`
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2003-04-09 20:50:30 -04:00
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select uncompressed_length(compress(@test_compress_string));
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uncompressed_length(compress(@test_compress_string))
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117
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select length(compress(@test_compress_string))<length(@test_compress_string);
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length(compress(@test_compress_string))<length(@test_compress_string)
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1
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2003-12-10 04:31:42 +00:00
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create table t1 (a text, b char(255), c char(4)) engine=myisam;
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2003-04-09 20:50:30 -04:00
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insert into t1 (a,b,c) values (compress(@test_compress_string),compress(@test_compress_string),'d ');
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select uncompress(a) from t1;
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uncompress(a)
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string for test compress function aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
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select uncompress(b) from t1;
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uncompress(b)
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string for test compress function aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
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select concat('|',c,'|') from t1;
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concat('|',c,'|')
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|d|
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drop table t1;
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2003-04-22 18:41:47 -04:00
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select compress("");
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compress("")
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select uncompress("");
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uncompress("")
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select uncompress(compress(""));
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uncompress(compress(""))
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select uncompressed_length("");
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uncompressed_length("")
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0
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2003-10-12 15:16:45 +02:00
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create table t1 (a text);
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insert t1 values (compress(null)), ('A\0\0\0BBBBBBBB'), (compress(space(50000))), (space(50000));
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select length(a) from t1;
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length(a)
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2003-09-19 12:25:03 +05:00
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NULL
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2003-10-12 15:16:45 +02:00
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12
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76
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50000
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select length(uncompress(a)) from t1;
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length(uncompress(a))
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2003-09-19 12:25:03 +05:00
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NULL
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2003-10-12 15:16:45 +02:00
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NULL
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50000
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NULL
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Warnings:
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2003-11-03 14:01:59 +02:00
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Error 1258 ZLIB: Input data was corrupted for zlib
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2003-10-12 15:16:45 +02:00
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Error 1255 Too big size of uncompressed data. The maximum size is 1048576. (probably, length of uncompressed data was corrupted)
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drop table t1;
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