ROW_COUNT

Warning

SingleStore 9.0 gives you the opportunity to preview, evaluate, and provide feedback on new and upcoming features prior to their general availability. In the interim, SingleStore 8.9 is recommended for production workloads, which can later be upgraded to SingleStore 9.0.

Syntax

SQL

ROW_COUNT()

Arguments

None.

Return Type

int

Examples

The following shows how to use ROW_COUNT() in a query after running an INSERT:

SQL

DROP TABLE IF EXISTS account;
CREATE TABLE account(id int, amount decimal(10,2));
INSERT account VALUES(1, 10.00), (2, 30.00);

SELECT ROW_COUNT();

+-------------+
| ROW_COUNT() |
+-------------+
|           2 |
+-------------+

This example shows how an application can raise an error if a ROW_COUNT() result is different than expected after a DELETE:

SQL

DELIMITER //
CREATE OR REPLACE PROCEDURE delete_account(_id int) RETURNS int AS
DECLARE _row_count int = -1;
BEGIN
  DELETE FROM account WHERE account.id = _id;
  _row_count = row_count();
  IF _row_count = 0 THEN
    RAISE user_exception(CONCAT("No rows deleted for account ", _id));
  END IF;
  RETURN _row_count;
END //
DELIMITER ;

Example use:

SQL

ECHO delete_account(3);
ERROR 2242 (HY000): Unhandled exception
Type: ER_USER_RAISE
Message: No rows deleted for account 3
Callstack:
  #0 Line 7 in `db1`.`delete_account`

ECHO delete_account(1);
+--------+
| RESULT |
+--------+
|      1 |
+--------+