php mysql获取表字段名称和字段信息的三种方法
先给出本实例中使用的表的信息：
使用desc获取表字段信息
php代码如下：
mysql_connect("localhost","root","");
mysql_select_db("test");
$query = "desc student";
$result = mysql_query($query);
while($row=mysql_fetch_assoc($result)){
print_r($row);
}
?>
运行结果：
Array
(
[Field] => student_id
[Type] => int(4)
[Null] => NO
[Key] => PRI
[Default] =>
[Extra] => auto_increment
)
Array
(
[Field] => student_name
[Type] => varchar(50)
[Null] => NO
[Key] =>
[Default] =>
[Extra] =>
)
Array
(
[Field] => class_id
[Type] => int(4)
[Null] => NO
[Key] =>
[Default] =>
[Extra] =>
)
Array
(
[Field] => total_score
[Type] => int(4)
[Null] => NO
[Key] =>
[Default] =>
[Extra] =>
)
使用SHOW FULL FIELDS获取表字段信息
php代码如下：
mysql_connect("localhost","root","");
mysql_select_db("test");
$query = "SHOW FULL COLUMNS FROM student";
$result = mysql_query($query);
while($row=mysql_fetch_assoc($result)){
print_r($row);
}
?>
运行结果：
Array
(
[Field] => student_id
[Type] => int(4)
[Collation] =>
[Null] => NO
[Key] => PRI
[Default] =>
[Extra] => auto_increment
[Privileges] => select,insert,update,references
[Comment] =>
)
Array
(
[Field] => student_name
[Type] => varchar(50)
[Collation] => latin1_swedish_ci
[Null] => NO
[Key] =>
[Default] =>
[Extra] =>
[Privileges] => select,insert,update,references
[Comment] =>
)
Array
(
[Field] => class_id
[Type] => int(4)
[Collation] =>
[Null] => NO
[Key] =>
[Default] =>
[Extra] =>
[Privileges] => select,insert,update,references
[Comment] =>
)
Array
(
[Field] => total_score
[Type] => int(4)
[Collation] =>
[Null] => NO
[Key] =>
[Default] =>
[Extra] =>
[Privileges] => select,insert,update,references
[Comment] =>
)
使用mysql_fetch_field方法获取表字段信息
php代码如下：
mysql_connect("localhost","root","");
mysql_select_db("test");
$query = "SELECT * FROM student LIMIT 1";
$result = mysql_query($query);
$fields = mysql_num_fields($result);
for($count=0;$count
{
$field = mysql_fetch_field($result,$count);
print_r($field);
}
?>
运行结果如下：
stdClass Object
(
[name] => student_id
[table] => student
[def] =>
[max_length] => 1
[not_null] => 1
[primary_key] => 1
[multiple_key] => 0
[unique_key] => 0
[numeric] => 1
[blob] => 0
[type] => int
[unsigned] => 0
[zerofill] => 0
)
stdClass Object
(
[name] => student_name
[table] => student
[def] =>
[max_length] => 5
[not_null] => 1
[primary_key] => 0
[multiple_key] => 0
[unique_key] => 0
[numeric] => 0
[blob] => 0
[type] => string
[unsigned] => 0
[zerofill] => 0
)
stdClass Object
(
[name] => class_id
[table] => student
[def] =>
[max_length] => 1
[not_null] => 1
[primary_key] => 0
[multiple_key] => 0
[unique_key] => 0
[numeric] => 1
[blob] => 0
[type] => int
[unsigned] => 0
[zerofill] => 0
)
stdClass Object
(
[name] => total_score
[table] => student
[def] =>
[max_length] => 3
[not_null] => 1
[primary_key] => 0
[multiple_key] => 0
[unique_key] => 0
[numeric] => 1
[blob] => 0
[type] => int
[unsigned] => 0
[zerofill] => 0
)
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