pg_field_type_oid

(PHP 5 >= 5.1.0, PHP 7, PHP 8)

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

说明

pg_field_type_oid(PgSql\Result $result, int $field): string|int

pg_field_type_oid() returns an integer containing the OID of the base type of the given field in the given result instance.

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.

注意:
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: PgSql\Result 实例，由 pg_query()、pg_query_params() 或者 pg_execute()（等）返回。
field: Field number, starting from 0.

返回值

The OID of the field's base type.

更新日志

版本	说明
8.1.0	现在 `result` 参数接受 PgSql\Result 实例，之前接受 resource。

示例

示例 #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);
?>

以上示例会输出：

Title field type OID: 1043

参见

pg_field_type() - 返回相应字段编号的类型名称
pg_field_prtlen() - 返回打印的长度
pg_field_name() - 返回字段名

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用户贡献的备注 2 notes

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stanislav dot perfilov at gmail dot com ¶

3 years ago

<?php

private function mapping($q, $result)
    {
        $types = [];
        for ($i = 0, $count = \pg_num_fields($q); $i < $count; ++$i) {
            $types[$i] = \pg_field_type_oid($q, $i);
        }
        foreach ($result as $k => &$row) {
            $i = -1;
            foreach ($row as $name => &$value) {
                ++$i;
                if ($value === null) {
                    continue;
                }
                switch ($types[$i]) {
                    case 20:
                    case 21:
                    case 23: $value = (int)$value; break;
                    case 16507: /*$value = (string)$value; */break;
                    default:
                        throw new \RuntimeException(
                            \pg_field_type($q, $i) .' type. Need mapping ' . \pg_field_type_oid($q, $i)
                        );
                }
            }
        }
        unset($value, $row);

        return $result;
    }

?>

down

mauroi at digbang dot com ¶

19 years ago

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.