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fix ALTER TABLE .. DROP CONSTRAINT IF NOT EXISTS

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This commit is contained in:
Sergei Golubchik 2016-07-02 12:22:58 +02:00
parent 5c764a0eb8
commit b258f91103
3 changed files with 5 additions and 1 deletions
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3
mysql-test/r/check_constraint.result
View file

@ -84,6 +84,9 @@ t2 CREATE TABLE `t2` (
) ENGINE=MyISAM DEFAULT CHARSET=latin1 ) ENGINE=MyISAM DEFAULT CHARSET=latin1
alter table t2 drop constraint c; alter table t2 drop constraint c;
ERROR 42000: Can't DROP CONSTRAINT `c`; check that it exists ERROR 42000: Can't DROP CONSTRAINT `c`; check that it exists
alter table t2 drop constraint if exists c;
Warnings:
Note 1091 Can't DROP CONSTRAINT `c`; check that it exists
alter table t2 drop constraint min; alter table t2 drop constraint min;
show create table t2; show create table t2;
Table Create Table Table Create Table

1
mysql-test/t/check_constraint.test
View file

@ -48,6 +48,7 @@ create table t2 like t1;
show create table t2; show create table t2;
--error ER_CANT_DROP_FIELD_OR_KEY --error ER_CANT_DROP_FIELD_OR_KEY
alter table t2 drop constraint c; alter table t2 drop constraint c;
alter table t2 drop constraint if exists c;
alter table t2 drop constraint min; alter table t2 drop constraint min;
show create table t2; show create table t2;

2
sql/sql_table.cc
View file

@ -5880,7 +5880,7 @@ drop_create_field:
} }
else if (drop->type == Alter_drop::CHECK_CONSTRAINT) else if (drop->type == Alter_drop::CHECK_CONSTRAINT)
{ {
for (uint i=0; i < table->s->table_check_constraints; i++) for (uint i=table->s->field_check_constraints; i < table->s->table_check_constraints; i++)
{ {
if (my_strcasecmp(system_charset_info, drop->name, if (my_strcasecmp(system_charset_info, drop->name,
table->check_constraints[i]->name.str) == 0) table->check_constraints[i]->name.str) == 0)