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Code Activity

Implemented MDEV-3941: CREATE TABLE xxx IF NOT EXISTS should not block if table exists.

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- Added option to check_if_table_exists() to quickly check if table exists (either SHARE or .FRM)
- Extended lock_table_names() to not wait for meta data locks if CREATE IF NOT EXISTS is used.

mysql-test/r/create.result:
  New test case
mysql-test/t/create.test:
  New test case
sql/sql_base.cc:
  Added option to check_if_table_exists() to quickly check if table exists (either SHARE or .FRM)
  Extended lock_table_names() to not wait for meta data locks if CREATE IF NOT EXISTS is used.
sql/sql_base.h:
  Updated prototype
sql/sql_db.cc:
  Added extra argument to call to check_if_table_exists()
This commit is contained in:
Michael Widenius
2012-12-16 16:13:17 +02:00
parent a6a8f12fa3
commit 33f3a11e2d
5 changed files with 111 additions and 14 deletions
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18
mysql-test/r/create.result
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@ -2403,3 +2403,21 @@ a b
1 1
drop table t1;
#
# Checking that CREATE IF NOT EXISTS is not blocked by running SELECT
#
create table t1 (a int, b int) engine=myisam;
create table t2 (a int, b int) engine=myisam;
insert into t1 values (1,1);
lock tables t1 read;
set @@lock_wait_timeout=5;
create table if not exists t1 (a int, b int);
ERROR 42S01: Table 't1' already exists
create table if not exists t1 (a int, b int) select 2,2;
ERROR 42S01: Table 't1' already exists
create table if not exists t1 like t2;
ERROR 42S01: Table 't1' already exists
select * from t1;
a b
1 1
unlock tables;
drop table t1,t2;