diff options
Diffstat (limited to 'sql/ha_innodb.cc')
| -rw-r--r-- | sql/ha_innodb.cc | 38 |
1 files changed, 36 insertions, 2 deletions
diff --git a/sql/ha_innodb.cc b/sql/ha_innodb.cc index 6599033704d..6c717f8601d 100644 --- a/sql/ha_innodb.cc +++ b/sql/ha_innodb.cc @@ -3639,9 +3639,42 @@ ha_innobase::reset(void) } /********************************************************************** +When we create a temporary table inside MySQL LOCK TABLES, MySQL will +not call external_lock for the temporary table when it uses it. Instead, +it will call this function. */ + +int +start_stmt( +/*=======*/ + /* out: 0 or error code */ + THD* thd) /* in: handle to the user thread */ +{ + row_prebuilt_t* prebuilt = (row_prebuilt_t*) innobase_prebuilt; + trx_t* trx; + + DBUG_ENTER("ha_innobase::external_lock"); + + update_thd(thd); + + trx = prebuilt->trx; + + innobase_release_stat_resources(trx); + trx_mark_sql_stat_end(trx); + + auto_inc_counter_for_this_stat = 0; + prebuilt->sql_stat_start = TRUE; + prebuilt->hint_no_need_to_fetch_extra_cols = TRUE; + prebuilt->read_just_key = 0; + prebuilt->select_lock_type = LOCK_NONE; + + thd->transaction.all.innodb_active_trans = 1; +} + +/********************************************************************** As MySQL will execute an external lock for every new table it uses when it -starts to process an SQL statement, we can use this function to store the -pointer to the THD in the handle. We will also use this function to communicate +starts to process an SQL statement (an exception is when MySQL calls +start_stmt for the handle) we can use this function to store the pointer to +the THD in the handle. We will also use this function to communicate to InnoDB that a new SQL statement has started and that we must store a savepoint to our transaction handle, so that we are able to roll back the SQL statement in case of an error. */ @@ -3649,6 +3682,7 @@ the SQL statement in case of an error. */ int ha_innobase::external_lock( /*=======================*/ + /* out: 0 or error code */ THD* thd, /* in: handle to the user thread */ int lock_type) /* in: lock type */ { |