maxdb_fetch_lengths
maxdb_result::lengths
(PECL maxdb >= 1.0)
maxdb_fetch_lengths -- maxdb_result::lengths — Returns the lengths of the columns of the current row in the result set
说明
过程化风格
$result
)面向对象风格
The maxdb_fetch_lengths() function returns an array containing the
lengths of every column of the current row within the result set represented by the
result parameter. If successful, a numerically indexed array
representing the lengths of each column is returned 或者在失败时返回 FALSE .
返回值
An array of integers representing the size of each column (not including
any terminating null characters). FALSE if an error occurred.
maxdb_fetch_lengths() is valid only for the current row of the result set.
It returns FALSE if you call it before calling maxdb_fetch_row/array/resource or after retrieving
all rows in the result.
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();
}
$query = "SELECT * from hotel.customer WHERE cno = 3000" ;
if ( $result = $maxdb -> query ( $query )) {
$row = $result -> fetch_row ();
foreach ( $result -> lengths as $i => $val ) {
printf ( "Field %2d has Length %2d\n" , $i + 1 , $val );
}
$result -> close ();
}
$maxdb -> close ();
?> Example #2 过程化风格
<?php
$link = maxdb_connect ( "localhost" , "MONA" , "RED" , "DEMODB" );
if ( maxdb_connect_errno ()) {
printf ( "Connect failed: %s\n" , maxdb_connect_error ());
exit();
}
$query = "SELECT * from hotel.customer WHERE cno = 3000" ;
if ( $result = maxdb_query ( $link , $query )) {
$row = maxdb_fetch_row ( $result );
foreach ( maxdb_fetch_lengths ( $result ) as $i => $val ) {
printf ( "Field %2d has Length %2d\n" , $i + 1 , $val );
}
maxdb_free_result ( $result );
}
maxdb_close ( $link );
?> 以上例程的输出类似于：
Field 1 has Length 4 Field 2 has Length 3 Field 3 has Length 5 Field 4 has Length 6 Field 5 has Length 5 Field 6 has Length 21