当前位置: 首页 > 网络学院 > 服务端脚本教程 > PHP > mysql_fetch_field() 函数

PHP
PHP 安全邮件
MySQL 介绍
连接 MySQL
创建 MySQL
MySQL 插入记录
MySQL 选择记录
MySQL Where
MySQL Order By
MySQL 记录更新
MySQL 删除记录
PHP ODBC
XML Expat Parser
XML SimpleXML
PHP 数组参考
PHP Calendar
PHP Date
PHP Directory
PHP Filesystem
PHP FTP
PHP HTTP

No. « 1 2 3 4 »

学院文章搜索

关键字

PHP 中的 mysql_fetch_field() 函数

出处:互联网   整理: 软晨网（RuanChen.com）   发布: 2009-03-04   浏览: 620 ::
收藏到网摘: n/a

Definition and Usage
定义和用法

The mysql_fetch_field() function returns an object containing information of a field from a recordset.
mysql_fetch_field()函数的作用是：从结果集中取得列信息并作为对象返回。

This function gets field data from the mysql_query() function and returns an object on success, or FALSE on failure or when there are no more rows.
如果函数成功执行，它将获取一行信息（该行是通过执行mysql_query()函数取得的）并返回该行信息；如果失败，将不返回任何一行。

Possible return values:
返回的可能值：

  • name - Field name
    name –字段名
  • table - The table the field belongs to
    table –字段所属的表格
  • def - Default value for the field
    def –字段的默认值
  • max_length - Maximum field length
    max_length –最长字段名
  • not_null - 1 if the field cannot be NULL
    not_null –如果字段不能为空值，那么其值为1
  • primary_key - 1 if the field is a primary key
    primary_key –如果该字段是一个私钥[primary key]，那么其值为1
  • unique_key - 1 if the field is a unique key
    unique_key –如果字段是一个独立的键，那么其值为1
  • multiple_key - 1 if the field is a non-unique key
    multiple_key –如果字段是一个非独立键，那么其值为1
  • numeric - 1 if the field is numeric
    numeric –如果字段是数值，那么其值为1
  • blob - 1 if the field is a BLOB
    blob –如果字段是一个点[blob]，那么其值为1
  • type - Field type
    type –字段类型
  • unsigned - 1 if the field is unsigned
    unsigned –如果字段是不区分正负号的，那么其值为1
  • zerofill - 1 if the field is zero-filled
    zerofill –如果字段包含0，那么其值为1

Syntax
语法

mysql_fetch_field(data,field_offset)

Parameter
参数		 Description
描述
data Required. Specifies which data pointer to use. The data pointer is the result from the mysql_query() function
必要参数。指定需要使用的数据指针[data pointer]。该数据指针是通过请求mysql_query()函数返回的。
field_offset Optional. Specifies which field to start returning. 0 indicates the first field. If this parameter is not set, it will retrieve the next field
可选参数。指定字段的起始位置。0表示第一个字段。如果不指定这个参数，那么它将获取下一个字段

Tips and Notes
注意点

Note: Each subsequent call to mysql_fetch_field() returns the next field in the recordset.
注意：如果接下来继续请求mysql_fetch_array()函数，那么将返回下一条记录。

Example
案例

<?php
$con = mysql_connect("localhost", "peter", "abc123");
if (!$con)
 {
 die('Could not connect: ' . mysql_error());
 }
$db_selected = mysql_select_db("test_db",$con);
$sql = "SELECT * from Person";
$result = mysql_query($sql,$con);
while ($property = mysql_fetch_field($result))
 {
 echo "Field name: " . $property->name . "<br />";
 echo "Table name: " . $property->table . "<br />";
 echo "Default value: " . $property->def . "<br />";
 echo "Max length: " . $property->max_length . "<br />";
 echo "Not NULL: " . $property->not_null . "<br />"; 
 echo "Primary Key: " . $property->primary_key . "<br />";
 echo "Unique Key: " . $property->unique_key . "<br />"; 
 echo "Mutliple Key: " . $property->multiple_key . "<br />";
 echo "Numeric Field: " . $property->numeric . "<br />";
 echo "BLOB: " . $property->blob . "<br />";
 echo "Field Type: " . $property->type . "<br />";
 echo "Unsigned: " . $property->unsigned . "<br />";
 echo "Zero-filled: " . $property->zerofill . "<br /><br />"; 
 }
mysql_close($con);
?>

The output of the code above could be:
上述代码将输出下面的结果：

Field name: LastName
Table name: Person
Default value: 
Max length: 8
Not NULL: 0
Primary Key: 0
Unique Key: 0
Mutliple Key: 0
Numeric Field: 0
BLOB: 0
Field Type: string
Unsigned: 0
Zero-filled: 0
Field name: FirstName
Table name: Person
Default value: 
Max length: 7
Not NULL: 0
Primary Key: 0
Unique Key: 0
Mutliple Key: 0
Numeric Field: 0
BLOB: 0
Field Type: string
Unsigned: 0
Zero-filled: 0
Field name: Address
Table name: Person
Default value: 
Max length: 9
Not NULL: 0
Primary Key: 0
Unique Key: 0
Mutliple Key: 0
Numeric Field: 0
BLOB: 0
Field Type: string
Unsigned: 0
Zero-filled: 0
Field name: Age
Table name: Person
Default value: 
Max length: 2
Not NULL: 0
Primary Key: 0
Unique Key: 0
Mutliple Key: 0
Numeric Field: 1
BLOB: 0
Field Type: int
Unsigned: 0
Zero-filled: 0

评论 (0) All

登陆 | 还没注册？