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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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12
mysql-test/r/insert_select.result
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@ -705,3 +705,15 @@ use bug21774_1;
INSERT INTO bug21774_2.t1 SELECT t1.* FROM t1;
DROP DATABASE bug21774_1;
DROP DATABASE bug21774_2;
USE test;
create table t1(f1 int primary key, f2 int);
insert into t1 values (1,1);
affected rows: 1
insert into t1 values (1,1) on duplicate key update f2=1;
affected rows: 0
insert into t1 values (1,1) on duplicate key update f2=2;
affected rows: 2
select * from t1;
f1 f2
1 2
drop table t1;