pg_field_type_oid

(PHP 5 >= 5.1.0)

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

说明

int pg_field_type_oid ( resource $result , int $field_number )

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

PHP手册 - N: Returns the type ID (OID) for the corresponding field number

用户评论:

mauroi at digbang dot com (24-Mar-2005 03:55)

This function can be used to improve the performance of your application. pg_field_type() makes an internal query to the pg_type table and it can be really slow. So if your application previously know the oids of your database, you can save the execution time of this query in every request.