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Bug#19978: INSERT .. ON DUPLICATE erroneously reports some records were

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updated.

INSERT ... ON DUPLICATE KEY UPDATE reports that a record was updated when
the duplicate key occurs even if the record wasn't actually changed
because the update values are the same as those in the record.

Now the compare_record() function is used to check whether the record was
changed and the update of a record reported only if the record differs
from the original one.
This commit is contained in:
evgen@moonbone.local
2007-02-07 00:46:03 +03:00
parent 5092f7ab26
commit 968369906e
5 changed files with 43 additions and 11 deletions
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13
mysql-test/t/insert_select.test
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@ -265,4 +265,17 @@ INSERT INTO bug21774_2.t1 SELECT t1.* FROM t1;
DROP DATABASE bug21774_1;
DROP DATABASE bug21774_2;
USE test;
#
# Bug#19978: INSERT .. ON DUPLICATE erroneously reports some records were
# updated.
#
create table t1(f1 int primary key, f2 int);
--enable_info
insert into t1 values (1,1);
insert into t1 values (1,1) on duplicate key update f2=1;
insert into t1 values (1,1) on duplicate key update f2=2;
--disable_info
select * from t1;
drop table t1;