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.

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
DOExpressionList
ExpressionList
Expression,
Expression
singleAtIdentifierassignmentEqNOTExpressionlogOrXORlogAndExpressionMATCH(ColumnNameList)AGAINST(BitExprFulltextSearchModifierOpt)PredicateExprIsOrNotOpNULLCompareOpsingleAtIdentifierassignmentEqPredicateExprAnyOrAllSubSelectIsOrNotOptrueKwdfalseKwdUNKNOWN

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

The DO statement in TiDB is fully compatible with MySQL. If you find any compatibility differences, report a bug.

See also

Was this page helpful?