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<mysql_fetch_assocmysql_fetch_lengths>
Last updated: Mon, 16 Jul 2012

mysql_fetch_field

(PHP 3, PHP 4, PHP 5)

mysql_fetch_field --  从结果集中取得列信息并作为对象返回

说明

object mysql_fetch_field ( resource result [, int field_offset] )

返回一个包含字段信息的对象。

mysql_fetch_field() 可以用来从某个查询结果中取得字段的信息。如果没有指定字段偏移量,则下一个尚未被 mysql_fetch_field() 取得的字段被提取。

对象的属性为:

  • name - 列名

  • table - 该列所在的表名

  • max_length - 该列最大长度

  • not_null - 1,如果该列不能为 NULL

  • primary_key - 1,如果该列是 primary key

  • unique_key - 1,如果该列是 unique key

  • multiple_key - 1,如果该列是 non-unique key

  • numeric - 1,如果该列是 numeric

  • blob - 1,如果该列是 BLOB

  • type - 该列的类型

  • unsigned - 1,如果该列是无符号数

  • zerofill - 1,如果该列是 zero-filled

注: 本函数返回的字段名是区分大小写的。

例子 1. mysql_fetch_field()

<?php
mysql_connect
('localhost:3306', $user, $password)
   or die(
"Could not connect: " . mysql_error());
mysql_select_db("database");
$result = mysql_query("select * from table")
   or die(
"Query failed: " . mysql_error());
/* get column metadata */
$i = 0;
while (
$i < mysql_num_fields($result)) {
   echo
"Information for column $i:<br />\n";
  
$meta = mysql_fetch_field($result);
   if (!
$meta) {
       echo
"No information available<br />\n";
   }
   echo
"<pre>
blob:       
$meta->blob
max_length: 
$meta->max_length
multiple_key:
$meta->multiple_key
name:       
$meta->name
not_null:   
$meta->not_null
numeric:     
$meta->numeric
primary_key: 
$meta->primary_key
table:       
$meta->table
type:       
$meta->type
unique_key: 
$meta->unique_key
unsigned:   
$meta->unsigned
zerofill:   
$meta->zerofill
</pre>"
;
  
$i++;
}
mysql_free_result($result);
?>

参见 mysql_field_seek()




<mysql_fetch_assocmysql_fetch_lengths>
 Last updated: Mon, 16 Jul 2012
 
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