MySQL Affected Rows

This example illustrates how to show the affected rows of the table.

In this example we create table "price" with 'assetid', 'date', 'open', 'high', 'low', 'close' and 'volume' field.

Query

 CREATE TABLE `price` (
   `assetid` int(11) NOT NULL default '0',
   `date` date NOT NULL default '0000-00-00',
   `open` double default NULL,
   `high` double default NULL,
   `low` double default NULL,
   `close` double default NULL,
   `volume` bigint(20) default NULL,
   PRIMARY KEY  (`assetid`,`date`)
 ) ENGINE=InnoDB DEFAULT CHARSET=latin1;

Output

Query OK, 0 rows affected (0.08 sec)

Here update a table "price".

Query

update price set open=3 where assetid=1;

Output

Query OK, 0 rows affected (0.00 sec)
Rows matched: 1  Changed: 0  Warnings: 0

Here execute Row_Count() function to count the rows.

Query

 select Row_Count();

Output

+-------------+
| Row_Count() |
+-------------+
| 0           |
+-------------+
1 row in set (0.00 sec)

Once-Again update the table.

Query

 update price set open=3 where assetid=2;

Output

Query OK, 1 row affected (0.03 sec)
Rows matched: 1  Changed: 1  Warnings: 0

Again execute Row_Count() function.

Query

select Row_Count();

Output

+-------------+
| Row_Count() |
+-------------+
| 1           |
+-------------+
1 row in set (0.00 sec)

Execute Row_Count() function with Row_Affected keyword.

Query

select Row_Count() as Row_Affected;

Output

+--------------+
| Row_Affected |
+--------------+
| 1            |
+--------------+
1 row in set (0.00 sec)

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