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PHP 中的 mysql_fetch_field() 函数

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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

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