maxdb_affected_rows

maxdb::affected_rows

(PECL maxdb >= 1.0)

maxdb_affected_rows -- maxdb::affected_rows — Gets the number of affected rows in a previous MaxDB operation

说明

过程化风格

int maxdb_affected_rows ( resource $link )

面向对象风格

int $maxdb->affected_rows;

maxdb_affected_rows() returns the number of rows affected by the last INSERT, UPDATE, or DELETE query associated with the provided link parameter. If this number cannot be determined, this function will return -1.

Note:

For SELECT statements maxdb_affected_rows() works like maxdb_num_rows() .

The maxdb_affected_rows() function only works with queries which modify a table. In order to return the number of rows from a SELECT query, use the maxdb_num_rows() function instead.

返回值

An integer greater than zero indicates the number of rows affected or retrieved. Zero indicates that no records where 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 number of rows affected can not be determined.

范例

Example #1 面向对象风格

  <?php
$maxdb  = new  maxdb ( "localhost" ,  "MONA" ,  "RED" ,  "DEMODB" );

 
 if ( maxdb_connect_errno ()) {
    printf ( "Connect failed: %s\n" ,  maxdb_connect_error ());
   exit();
}

 maxdb_report  ( MAXDB_REPORT_OFF );
 $maxdb -> query ( "DROP TABLE mycustomer" );
 maxdb_report  ( MAXDB_REPORT_ERROR );

 
 $maxdb -> query ( "CREATE TABLE mycustomer AS SELECT * from hotel.customer" );
 printf ( "Affected rows (INSERT): %d\n" ,  $maxdb -> affected_rows );

 $maxdb -> query ( "ALTER TABLE mycustomer ADD Status int default 0" );

 
 $maxdb -> query ( "UPDATE mycustomer SET Status=1 WHERE cno > 50" );
 printf ( "Affected rows (UPDATE): %d\n" ,  $maxdb -> affected_rows );

 
 $maxdb -> query ( "DELETE FROM mycustomer WHERE cno < 50" );
 printf ( "Affected rows (DELETE): %d\n" ,  $maxdb -> affected_rows );

 
 $result  =  $maxdb -> query ( "SELECT title FROM mycustomer" );
 printf ( "Affected rows (SELECT): %d\n" ,  $maxdb -> affected_rows );

 $result -> close ();

 
 $maxdb -> query ( "DROP TABLE mycustomer" );

 
 $maxdb -> close ();
 ?>

Example #2 过程化风格

  <?php
$link  =  maxdb_connect ( "localhost" ,  "MONA" ,  "RED" ,  "DEMODB" );

if (! $link ) {
    printf ( "Can't connect to localhost. Error: %s\n" ,  maxdb_connect_error ());
   exit();
}

 maxdb_report  ( MAXDB_REPORT_OFF );
 maxdb_query ( $link , "DROP TABLE mycustomer" );
 maxdb_report  ( MAXDB_REPORT_ERROR );

 
 maxdb_query ( $link ,  "CREATE TABLE mycustomer AS SELECT * from hotel.customer" );
 printf ( "Affected rows (INSERT): %d\n" ,  maxdb_affected_rows ( $link ));

 maxdb_query ( $link ,  "ALTER TABLE mycustomer ADD Status int default 0" );

 
 maxdb_query ( $link ,  "UPDATE mycustomer SET Status=1 WHERE cno > 50" );
 printf ( "Affected rows (UPDATE): %d\n" ,  maxdb_affected_rows ( $link ));

 
 maxdb_query ( $link ,  "DELETE FROM mycustomer WHERE cno < 50" );
 printf ( "Affected rows (DELETE): %d\n" ,  maxdb_affected_rows ( $link ));

 
 $result  =  maxdb_query ( $link ,  "SELECT title FROM mycustomer" );
 printf ( "Affected rows (SELECT): %d\n" ,  maxdb_affected_rows ( $link ));

 maxdb_free_result ( $result );

 
 maxdb_query ( $link ,  "DROP TABLE mycustomer" );

 
 maxdb_close ( $link );
 ?>

以上例程的输出类似于：

Affected rows (INSERT): 15
Affected rows (UPDATE): 15
Affected rows (DELETE): 0
Affected rows (SELECT): 15

参见

maxdb_num_rows() - Gets the number of rows in a result
maxdb_info() - Retrieves information about the most recently executed query