pg_field_name
(PHP 4 >= 4.2.0, PHP 5, PHP 7)
pg_field_name - 返回一个字段的名称
描述
string pg_field_name ( resource $result , int $field_number )
pg_field_name()返回给field_number
定PostgreSQL result
资源中占用给定字段的名称。字段编号从0开始。
注意:这个函数过去被称为pg_fieldname()。
参数
result
PostgreSQL查询结果资源,由pg_query(),pg_query_params()或pg_execute()等返回。
field_number
字段编号,从0开始。
返回值
字段名称或FALSE
错误。
例子
Example #1 Getting information about fields
<?php
??$dbconn?=?pg_connect("dbname=publisher")?or?die("Could?not?connect");
??$res?=?pg_query($dbconn,?"select?*?from?authors?where?author?=?'Orwell'");
??$i?=?pg_num_fields($res);
??for?($j?=?0;?$j?<?$i;?$j++)?{
??????echo?"column?$j\n";
??????$fieldname?=?pg_field_name($res,?$j);
??????echo?"fieldname:?$fieldname\n";
??????echo?"printed?length:?"?.?pg_field_prtlen($res,?$fieldname)?.?"?characters\n";
??????echo?"storage?length:?"?.?pg_field_size($res,?$j)?.?"?bytes\n";
??????echo?"field?type:?"?.?pg_field_type($res,?$j)?.?"?\n\n";
??}
?>
上面的例子将输出:
column 0
fieldname: author
printed length: 6 characters
storage length: -1 bytes
field type: varchar
column 1
fieldname: year
printed length: 4 characters
storage length: 2 bytes
field type: int2
column 2
fieldname: title
printed length: 24 characters
storage length: -1 bytes
field type: varchar
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