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
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: LastNameTable name: PersonDefault value: Max length: 8Not NULL: 0Primary Key:
0Unique Key: 0Mutliple Key: 0Numeric Field: 0BLOB: 0Field Type: stringUnsigned: 0Zero-filled: 0
Field name: FirstNameTable name: PersonDefault value: Max length: 7Not NULL:
0Primary Key: 0Unique Key: 0Mutliple Key: 0Numeric Field: 0BLOB: 0Field Type:
stringUnsigned: 0Zero-filled: 0
Field name: AddressTable name: PersonDefault value: Max length: 9Not NULL: 0Primary Key:
0Unique Key: 0Mutliple Key: 0Numeric Field: 0BLOB: 0Field Type: stringUnsigned: 0Zero-filled: 0
Field name: AgeTable name: PersonDefault value: Max length: 2Not NULL: 0Primary Key:
0Unique Key: 0Mutliple Key: 0Numeric Field: 1BLOB: 0Field Type: intUnsigned: 0Zero-filled: 0
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2014-11-6 16:19:47 |
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