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Bug#4118: multi-table UPDATE takes WRITE lock on read table

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Ensures that WRITE lock is not obtained on all tables referenced.


mysql-test/r/lock_multi.result:
  Bug#4118
    New test for multi-update locking
mysql-test/r/multi_update.result:
  Bug#4118
    Fix test
mysql-test/t/lock_multi.test:
  Bug#4118
    New test for multi-update locking
mysql-test/t/multi_update.test:
  Bug#4118
    Fix test
sql/sql_parse.cc:
  Bug#4118
    Split multi-update to its own case statement in sql_parse.cc
sql/sql_update.cc:
  Bug#4118
    Overview of locking checking:    
      1. Open and acquire READ lock
      2. Check to see which tables need WRITE lock
      3. Unlock tables and relock
sql/sql_yacc.yy:
  Bug#4118
    Split multi-update to its own case statement in sql_parse.cc
This commit is contained in:
unknown
2004-10-03 00:20:47 +01:00
parent 799505216f
commit a49f5cae9a
7 changed files with 155 additions and 33 deletions
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31
sql/sql_parse.cc
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@@ -1927,21 +1927,26 @@ mysql_execute_command(void)
send_error(&thd->net,ER_WRONG_VALUE_COUNT);
DBUG_VOID_RETURN;
}
if (select_lex->table_list.elements == 1)
if (check_one_table_access(thd, UPDATE_ACL, tables, 0))
goto error; /* purecov: inspected */
res= mysql_update(thd,tables,
select_lex->item_list,
lex->value_list,
select_lex->where,
(ORDER *) select_lex->order_list.first,
select_lex->select_limit,
lex->duplicates);
break;
case SQLCOM_MULTI_UPDATE:
if (check_db_used(thd,tables))
goto error;
if (select_lex->item_list.elements != lex->value_list.elements)
{
if (check_one_table_access(thd, UPDATE_ACL, tables, 0))
goto error; /* purecov: inspected */
res= mysql_update(thd,tables,
select_lex->item_list,
lex->value_list,
select_lex->where,
(ORDER *) select_lex->order_list.first,
select_lex->select_limit,
lex->duplicates);
send_error(&thd->net,ER_WRONG_VALUE_COUNT);
DBUG_VOID_RETURN;
}
else
{
const char *msg= 0;
TABLE_LIST *table;