mirror of
https://github.com/MariaDB/server.git
synced 2025-01-31 19:11:46 +01:00
ed1696f6b9
we store 7 bytes (1 + 2*3) in every Query_log_event. In the future if users want binlog optimized for small size and less safe, we could add --binlog-no-charset (and binlog-no-sql-mode etc): charset info is something by design optional (even if for now we don't offer possibility to disable it): it's not a binlog format change. We try to reduce the number of get_charset() calls in the slave SQL thread to a minimum by caching the charset read from the previous event (which will often be equal to the one of the current event). We don't use SET ONE_SHOT for charset-aware repl (we still do for timezones, will be fixed later). No more errors if one changes the global value of charset vars on master or slave (as we log charset info in all Query_log_event). Not fixing Load_log_event as it will be rewritten soon by Dmitri. Testing how mysqlbinlog behaves in rpl_charset.test. mysqlbinlog needs to know where charset file is (to be able to convert a charset number found in binlog (e.g. in User_var_log_event) to a charset name); mysql-test-run needs to pass the correct value for this option to mysqlbinlog. Many result udpates (adding charset info into every event shifts log_pos in SHOW BINLOG EVENTS). Roughly the same job is to be done for timezones :)
200 lines
5.9 KiB
Text
200 lines
5.9 KiB
Text
drop table if exists t1,t2;
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set @a := foo;
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ERROR 42S22: Unknown column 'foo' in 'field list'
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set @a := connection_id() + 3;
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select @a - connection_id();
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@a - connection_id()
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3
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set @b := 1;
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select @b;
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@b
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1
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CREATE TABLE t1 ( i int not null, v int not null,index (i));
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insert into t1 values (1,1),(1,3),(2,1);
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create table t2 (i int not null, unique (i));
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insert into t2 select distinct i from t1;
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select * from t2;
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i
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1
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2
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select distinct t2.i,@vv1:=if(sv1.i,1,0),@vv2:=if(sv2.i,1,0),@vv3:=if(sv3.i,1,0), @vv1+@vv2+@vv3 from t2 left join t1 as sv1 on sv1.i=t2.i and sv1.v=1 left join t1 as sv2 on sv2.i=t2.i and sv2.v=2 left join t1 as sv3 on sv3.i=t2.i and sv3.v=3;
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i @vv1:=if(sv1.i,1,0) @vv2:=if(sv2.i,1,0) @vv3:=if(sv3.i,1,0) @vv1+@vv2+@vv3
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1 1 0 1 2
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2 1 0 0 1
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explain select * from t1 where i=@vv1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref i i 4 const 1
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select @vv1,i,v from t1 where i=@vv1;
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@vv1 i v
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1 1 1
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1 1 3
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explain select * from t1 where @vv1:=@vv1+1 and i=@vv1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using where
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explain select @vv1:=i from t1 where i=@vv1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index NULL i 4 NULL 3 Using where; Using index
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explain select * from t1 where i=@vv1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref i i 4 const 1
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drop table t1,t2;
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set @a=0,@b=0;
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select @a:=10, @b:=1, @a > @b, @a < @b;
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@a:=10 @b:=1 @a > @b @a < @b
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10 1 1 0
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select @a:="10", @b:="1", @a > @b, @a < @b;
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@a:="10" @b:="1" @a > @b @a < @b
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10 1 1 0
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select @a:=10, @b:=2, @a > @b, @a < @b;
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@a:=10 @b:=2 @a > @b @a < @b
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10 2 0 1
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select @a:="10", @b:="2", @a > @b, @a < @b;
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@a:="10" @b:="2" @a > @b @a < @b
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10 2 1 0
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select @a:=1;
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@a:=1
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1
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select @a, @a:=1;
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@a @a:=1
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1 1
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create table t1 (id int, d double, c char(10));
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insert into t1 values (1,2.0, "test");
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select @c:=0;
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@c:=0
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0
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update t1 SET id=(@c:=@c+1);
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select @c;
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@c
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1
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select @c:=0;
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@c:=0
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0
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update t1 set id=(@c:=@c+1);
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select @c;
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@c
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1
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select @c:=0;
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@c:=0
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0
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select @c:=@c+1;
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@c:=@c+1
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1
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select @d,(@d:=id),@d from t1;
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@d (@d:=id) @d
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NULL 1 1
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select @e,(@e:=d),@e from t1;
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@e (@e:=d) @e
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NULL 2 2
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select @f,(@f:=c),@f from t1;
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@f (@f:=c) @f
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NULL test test
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set @g=1;
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select @g,(@g:=c),@g from t1;
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@g (@g:=c) @g
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1 test test
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select @c, @d, @e, @f;
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@c @d @e @f
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1 1 2 test
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select @d:=id, @e:=id, @f:=id, @g:=@id from t1;
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@d:=id @e:=id @f:=id @g:=@id
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1 1 1 NULL
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select @c, @d, @e, @f, @g;
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@c @d @e @f @g
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1 1 1 1 NULL
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drop table t1;
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select @a:=10, @b:=2, @a>@b, @a:="10", @b:="2", @a>@b, @a:=10, @b:=2, @a>@b, @a:="10", @b:="2", @a>@b;
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@a:=10 @b:=2 @a>@b @a:="10" @b:="2" @a>@b @a:=10 @b:=2 @a>@b @a:="10" @b:="2" @a>@b
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10 2 1 10 2 1 10 2 1 10 2 1
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create table t1 (i int not null);
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insert t1 values (1),(2),(2),(3),(3),(3);
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select @a:=0;
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@a:=0
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0
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select @a, @a:=@a+count(*), count(*), @a from t1 group by i;
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@a @a:=@a+count(*) count(*) @a
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0 1 1 0
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0 2 2 0
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0 3 3 0
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select @a:=0;
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@a:=0
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0
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select @a+0, @a:=@a+0+count(*), count(*), @a+0 from t1 group by i;
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@a+0 @a:=@a+0+count(*) count(*) @a+0
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0 1 1 0
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1 3 2 0
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3 6 3 0
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drop table t1;
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set @a=_latin2'test';
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select charset(@a),collation(@a),coercibility(@a);
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charset(@a) collation(@a) coercibility(@a)
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latin2 latin2_general_ci 3
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select @a=_latin2'TEST';
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@a=_latin2'TEST'
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1
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select @a=_latin2'TEST' collate latin2_bin;
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@a=_latin2'TEST' collate latin2_bin
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0
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set @a=_latin2'test' collate latin2_general_ci;
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select charset(@a),collation(@a),coercibility(@a);
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charset(@a) collation(@a) coercibility(@a)
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latin2 latin2_general_ci 0
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select @a=_latin2'TEST';
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@a=_latin2'TEST'
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1
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select @a=_latin2'TEST' collate latin2_bin;
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ERROR HY000: Illegal mix of collations (latin2_general_ci,EXPLICIT) and (latin2_bin,EXPLICIT) for operation '='
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select charset(@a:=_latin2'test');
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charset(@a:=_latin2'test')
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latin2
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select collation(@a:=_latin2'test');
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collation(@a:=_latin2'test')
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latin2_general_ci
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select coercibility(@a:=_latin2'test');
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coercibility(@a:=_latin2'test')
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3
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select collation(@a:=_latin2'test' collate latin2_bin);
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collation(@a:=_latin2'test' collate latin2_bin)
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latin2_bin
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select coercibility(@a:=_latin2'test' collate latin2_bin);
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coercibility(@a:=_latin2'test' collate latin2_bin)
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0
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select (@a:=_latin2'test' collate latin2_bin) = _latin2'TEST';
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(@a:=_latin2'test' collate latin2_bin) = _latin2'TEST'
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0
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select charset(@a),collation(@a),coercibility(@a);
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charset(@a) collation(@a) coercibility(@a)
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latin2 latin2_bin 0
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select (@a:=_latin2'test' collate latin2_bin) = _latin2'TEST' collate latin2_general_ci;
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ERROR HY000: Illegal mix of collations (latin2_bin,EXPLICIT) and (latin2_general_ci,EXPLICIT) for operation '='
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create table t1 (a varchar(50));
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reset master;
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SET TIMESTAMP=10000;
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SET @`a b`='hello';
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INSERT INTO t1 VALUES(@`a b`);
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set @var1= "';aaa";
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SET @var2=char(ascii('a'));
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insert into t1 values (@var1),(@var2);
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show binlog events from 95;
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Log_name Pos Event_type Server_id End_log_pos Info
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master-bin.000001 95 User var 1 136 @`a b`=_latin1 0x68656C6C6F COLLATE latin1_swedish_ci
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master-bin.000001 136 Query 1 229 use `test`; INSERT INTO t1 VALUES(@`a b`)
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master-bin.000001 229 User var 1 271 @`var1`=_latin1 0x273B616161 COLLATE latin1_swedish_ci
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master-bin.000001 271 User var 1 309 @`var2`=_latin1 0x61 COLLATE latin1_swedish_ci
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master-bin.000001 309 Query 1 410 use `test`; insert into t1 values (@var1),(@var2)
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/*!40019 SET @@session.max_insert_delayed_threads=0*/;
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SET @`a b`:=_latin1 0x68656C6C6F COLLATE `latin1_swedish_ci`;
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use test;
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SET TIMESTAMP=10000;
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SET @@session.foreign_key_checks=1, @@session.sql_auto_is_null=1, @@session.unique_checks=1;
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SET @@session.sql_mode=0;
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SET @@session.character_set_client=8,@@session.collation_connection=8,@@session.collation_server=8;
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INSERT INTO t1 VALUES(@`a b`);
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SET @`var1`:=_latin1 0x273B616161 COLLATE `latin1_swedish_ci`;
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SET @`var2`:=_latin1 0x61 COLLATE `latin1_swedish_ci`;
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SET TIMESTAMP=10000;
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insert into t1 values (@var1),(@var2);
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drop table t1;
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set @var= NULL ;
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select FIELD( @var,'1it','Hit') as my_column;
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my_column
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0
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