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A fix and test case for Bug#6297 "prepared statement, wrong handling

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of <parameter> IS NULL":
we must not only set Item::null_value in Item_param, but implement
Item_param::is_null() to work well with IS NULL/IS NOT NULL clauses.


mysql-test/r/ps.result:
  Test case for Bug#6297: test results fixed.
mysql-test/t/ps.test:
  A test case for Bug#6297 "prepared statement, wrong handling of 
  <parameter> IS NULL"
sql/item.h:
  A fix for Bug#6297: we must not only set null_value in Item_param, but
  also implement Item_param::is_null() to work well with  IS NULL/
  IS NOT NULL.
  Item::is_null() commented.
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2004-11-21 12:04:27 +03:00
parent 99d2d10097
commit 3507a52e60
3 changed files with 45 additions and 0 deletions
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21
mysql-test/r/ps.result
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@ -450,3 +450,24 @@ PREPARE stmt FROM 'UPDATE t1 AS P1 INNER JOIN (SELECT N FROM t1 GROUP BY N HAVIN
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
DROP TABLE t1;
prepare stmt from "select ? is null, ? is not null, ?";
select @no_such_var is null, @no_such_var is not null, @no_such_var;
@no_such_var is null @no_such_var is not null @no_such_var
1 0 NULL
execute stmt using @no_such_var, @no_such_var, @no_such_var;
? is null ? is not null ?
1 0 NULL
set @var='abc';
select @var is null, @var is not null, @var;
@var is null @var is not null @var
0 1 abc
execute stmt using @var, @var, @var;
? is null ? is not null ?
0 1 abc
set @var=null;
select @var is null, @var is not null, @var;
@var is null @var is not null @var
1 0 NULL
execute stmt using @var, @var, @var;
? is null ? is not null ?
1 0 NULL