my_ulonglong mysql_stmt_affected_rows(MYSQL_STMT *stmt)

Description

Returns the total number of rows changed, deleted, or inserted by the last executed statement. May be called immediately after mysql_stmt_execute() for UPDATE, DELETE, or INSERT statements. For SELECT statements, mysql_stmt_affected_rows() works like mysql_num_rows().

This function was added in MySQL 4.1.0.

Return Values

An integer greater than zero indicates the number of rows affected or retrieved. Zero indicates that no records were updated for an UPDATE statement, no rows matched the WHERE clause in the query, or that no query has yet been executed. -1 indicates that the query returned an error or that, for a SELECT query, mysql_stmt_affected_rows() was called prior to calling mysql_stmt_store_result(). Because mysql_stmt_affected_rows() returns an unsigned value, you can check for -1 by comparing the return value to (my_ulonglong)-1 (or to (my_ulonglong)~0, which is equivalent).

See Sección 24.2.3.1, “mysql_affected_rows()” for additional information on the return value.

Errors

None.

Example

For the usage of mysql_stmt_affected_rows(), refer to the Example from Sección 24.2.7.10, “mysql_stmt_execute()”.