MaxDB 函数
php 手册 | 脚本学堂 | 脚本编程 | 网站编程 | 系统管理 | 服务器配置 | 数据库管理 | Php教程 | python教程 | 正则表达式 | 批处理脚本 | Centos教程 | Linux基础教程

maxdb_fetch_lengths

result->lengths

(PECL maxdb >= 1.0)

maxdb_fetch_lengths -- result->lengthsReturns the lengths of the columns of the current row in the result set

说明

Procedural style:

array maxdb_fetch_lengths ( resource $result )

Object oriented style (property):

result
array $lengths;

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 or FALSE on failure.

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 Object oriented style

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

/* check connection */
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();

   
/* display column lengths */
   
foreach ($result->lengths as $i => $val) {
       
printf("Field %2d has Length %2d\n"$i+1$val);
   }
   
$result->close();
}

/* close connection */
$maxdb->close();
?>

Example #2 Procedural style

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

/* check connection */
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);

   
/* display column lengths */
   
foreach (maxdb_fetch_lengths($result) as $i => $val) {
       
printf("Field %2d has Length %2d\n"$i+1$val);
   }
   
maxdb_free_result($result);
}

/* close connection */
maxdb_close($link);
?>

上例的输出类似于:

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

MaxDB 函数
php 手册 | 脚本学堂 | 脚本编程 | 网站编程 | 系统管理 | 服务器配置 | 数据库管理 | Php教程 | python教程 | 正则表达式 | 批处理脚本 | Centos教程 | Linux基础教程