How to get the number of deleted rows in PostgreSQL?

user_178753 0
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I am looking for a way to return the number of rows affected by a DELETE clause in PostgreSQL. The documentation states that;

On successful completion, a DELETE command returns a command tag of the form

DELETE count

The count is the number of rows deleted. If count is 0, no rows matched the condition (this is not considered an error).

If the DELETE command contains a RETURNING clause, the result will be similar to that of a SELECT statement containing the columns and values defined in the RETURNING list, computed over the row(s) deleted by the command.

But I am having trouble finding a good example of it. Can anyone help me with this, how can I find out how many rows were deleted?

EDIT: I wanted to present an alternative that I have found later. It can be found in here, explained under 38.5.5. Obtaining the Result Status title.

rowcount delete-row sql-delete postgresql
6 Answers

This should be simple in Java. 

Statement stmt = connection.createStatement();
int rowsAffected = stmt.executeUpdate("delete from your_table");
System.out.println("deleted: " + rowsAffected);

See java.sql.Statement.

user_480440

This works in functions. It works with other operations like INSERT as well.

DECLARE _result INTEGER;
...
DELETE FROM mytable WHERE amount = 0;  -- or whatever other operation you desire
GET DIAGNOSTICS _result = ROW_COUNT;
IF _result > 0 THEN
    RAISE NOTICE 'Removed % rows with amount = 0', _result;
END IF;
user_116061930
user_157850
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