maxdb_fetch_field
maxdb_result::fetch_field
(PECL maxdb >= 1.0)
maxdb_fetch_field -- maxdb_result::fetch_field — Returns the next field in the result set
说明
过程化风格
面向对象风格
The maxdb_fetch_field() returns the definition of one column of a result set as an resource. Call this function repeatedly to retrieve information about all columns in the result set. maxdb_fetch_field() returns FALSE when no more fields are left.
返回值
Returns an resource which contains field definition information or FALSE if no field information is available.
| Property | Description |
|---|---|
| name | The name of the column |
| max_length | The maximum width of the field for the result set. |
| type | The data type used for this field |
| decimals | The number of decimals used (for integer fields) |
范例
Example #1 面向对象风格
<?php
$maxdb = new maxdb("localhost", "MONA", "RED", "DEMODB");
/* check connection */
if (maxdb_connect_errno()) {
printf("Connect failed: %s\n", maxdb_connect_error());
exit();
}
$query = "SELECT name, cno from hotel.customer ORDER BY cno";
if ($result = $maxdb->query($query)) {
/* Get field information for all columns */
while ($finfo = $result->fetch_field()) {
printf("Name: %s\n", $finfo->name);
printf("Table: %s\n", $finfo->table);
printf("max. Len: %d\n", $finfo->max_length);
printf("Flags: %d\n", $finfo->flags);
printf("Type: %d\n\n", $finfo->type);
}
$result->close();
}
/* close connection */
$maxdb->close();
?>
Example #2 过程化风格
<?php
$link = maxdb_connect("localhost", "MONA", "RED", "DEMODB");
/* check connection */
if (maxdb_connect_errno()) {
printf("Connect failed: %s\n", maxdb_connect_error());
exit();
}
$query = "SELECT name, cno from hotel.customer ORDER BY cno";
if ($result = maxdb_query($link, $query)) {
/* Get field information for all fields */
while ($finfo = maxdb_fetch_field($result)) {
printf("Name: %s\n", $finfo->name);
printf("Table: %s\n", $finfo->table);
printf("max. Len: %d\n", $finfo->max_length);
printf("Flags: %d\n", $finfo->flags);
printf("Type: %d\n\n", $finfo->type);
}
maxdb_free_result($result);
}
/* close connection */
maxdb_close($link);
?>
以上例程的输出类似于：
Name: NAME Table: max. Len: 10 Flags: -1 Type: 2 Name: CNO Table: max. Len: 4 Flags: -1 Type: 0
参见
- maxdb_num_fields() - Get the number of fields in a result
- maxdb_fetch_field_direct() - Fetch meta-data for a single field
- maxdb_fetch_fields() - Returns an array of resources representing the fields in a result set
- maxdb_field_seek() - Set result pointer to a specified field offset
