PHP mysql_fetch_field() 函数


PHP MySQL 函数

定义和用法

mysql_fetch_field() 函数从结果集中取得列信息并作为对象返回。

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

该函数返回一个包含字段信息的对象。

被返回的对象的属性为:

语法

mysql_fetch_field(data,field_offset)

参数 描述
data 必需。要使用的数据指针。该数据指针是从 mysql_query() 返回的结果。
field_offset 必需。规定从哪个字段开始。0 指示第一个字段。如果未设置,则取回下一个字段。


提示和注释

注释:本函数返回的字段名是区分大小写的。


例子

<?php
$con = mysql_connect("localhost", "hello", "321");
if (!$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);
?>

输出:

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: City
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


PHP MySQL 函数
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