PHP mysql_fetch_field() 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:
-
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
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
name . "
"; echo "Table name: " . $property->table . "
"; echo "Default value: " . $property->def . "
"; echo "Max length: " . $property->max_length . "
"; echo "Not NULL: " . $property->not_null . "
"; echo "Primary Key: " . $property->primary_key . "
"; echo "Unique Key: " . $property->unique_key . "
"; echo "Mutliple Key: " . $property->multiple_key . "
"; echo "Numeric Field: " . $property->numeric . "
"; echo "BLOB: " . $property->blob . "
"; echo "Field Type: " . $property->type . "
"; echo "Unsigned: " . $property->unsigned . "
"; echo "Zero-filled: " . $property->zerofill . "
"; } mysql_close($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
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