# pg_field_type_oid

(PHP 5 >= 5.1.0, PHP 7)

pg_field_type_oid — Returns the type ID (OID) for the corresponding field number

### 说明

pg_field_type_oid ( resource `$result` , int `$field_number` ) : int

pg_field_type_oid() returns an integer containing the OID of the base type of the given `field_number` in the given PostgreSQL `result` resource.

You can get more information about the field type by querying PostgreSQL's pg_type system table using the OID obtained with this function. The PostgreSQL format_type() function will convert a type OID into an SQL standard type name.

> Note:

> If the field uses a PostgreSQL domain (rather than a basic type), it is the OID of the domain's underlying type that is returned, rather than the OID of the domain itself.

### 参数

`result`

  PostgreSQL query result resource, returned by pg_query(), pg_query_params() or pg_execute() (among others).

`field_number`

  Field number, starting from 0.

### 返回值

The OID of the field's base type. `FALSE` is returned on error.

### 范例

Example #1 Getting information about fields

    <?php
      $dbconn = pg_connect("dbname=publisher") or die("Could not connect");

      // Assume 'title' is a varchar type
      $res = pg_query($dbconn, "select title from authors where author = 'Orwell'");

      echo "Title field type OID: ", pg_field_type_oid($res, 0);
    ?>

以上例程会输出：

    Title field type OID: 1043

### 参见

- pg_field_type() - 返回相应字段的类型名称
- pg_field_prtlen() - 返回打印出来的长度
- pg_field_name() - 返回字段的名字