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DO

DO executes the expressions but does not return any results. In most cases, DO is equivalent to SELECT expr, ... that does not return a result.

Note:

DO only executes expressions. It cannot be used in all cases where SELECT can be used. For example, DO id FROM t1 is invalid because it references a table.

In MySQL, a common use case is to execute stored procedure or trigger. Since TiDB does not provide stored procedure or trigger, this function has a limited use.

Synopsis

DoStmt:

DoStmt

ExpressionList:

ExpressionList

Expression:

Expression

Examples

This SELECT statement pauses, but also produces a result set.

mysql> SELECT SLEEP(5);
+----------+
| SLEEP(5) |
+----------+
|        0 |
+----------+
1 row in set (5.00 sec)

DO, on the other hand, pauses without producing a result set.

mysql> DO SLEEP(5);
Query OK, 0 rows affected (5.00 sec)

mysql> DO SLEEP(1), SLEEP(1.5);
Query OK, 0 rows affected (2.50 sec)

MySQL compatibility

This statement is understood to be fully compatible with MySQL. Any compatibility differences should be reported via an issue on GitHub.

See also