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(mysql.info) query-results

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 22.2.13.2 What Results You Can Get from a Query
 ...............................................
 
 In addition to the result set returned by a query, you can also get the
 following information:
 
    * `mysql_affected_rows()' returns the number of rows affected by the
      last query when doing an `INSERT', `UPDATE', or `DELETE'.
 
      For a fast re-create, use `TRUNCATE TABLE'.
 
    * `mysql_num_rows()' returns the number of rows in a result set. With
      `mysql_store_result()', `mysql_num_rows()' may be called as soon
      as `mysql_store_result()' returns. With `mysql_use_result()',
      `mysql_num_rows()' may be called only after you have fetched all
      the rows with `mysql_fetch_row()'.
 
    * `mysql_insert_id()' returns the ID generated by the last query
      that inserted a row into a table with an `AUTO_INCREMENT' index.
      See  mysql-insert-id.
 
    * Some queries (`LOAD DATA INFILE ...', `INSERT INTO ... SELECT ...',
      `UPDATE') return additional information.  The result is returned
      by `mysql_info()'.  See the description for `mysql_info()' for the
      format of the string that it returns.  `mysql_info()' returns a
      `NULL' pointer if there is no additional information.
 
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