pg_select

(PHP 4 >= 4.3.0, PHP 5)

pg_select 选择记录

说明

mixed pg_select ( resource $connection , string $table_name , array $assoc_array [, int $options = PGSQL_DML_EXEC ] )

pg_select() 根据 assoc_array 数组中的 field=>value 值来选择记录。成功的查询返回和 assoc_array 指定的条件相匹配的包括记录和字段的数组。

如果指定了 optionspg_convert() 会按照指定选项作用于 assoc_array 之上。

Warning

此函数是实验性的。此函数的表象,包括名称及其相关文档都可能在未来的 PHP 发布版本中未通知就被修改。使用本函数风险自担 。

参数

connection

PostgreSQL 数据库连接资源。

table_name

Name of the table from which to select rows.

assoc_array

An array whose keys are field names in the table table_name, and whose values are the conditions that a row must meet to be retrieved.

options

Any number of PGSQL_CONV_FORCE_NULL, PGSQL_DML_NO_CONV, PGSQL_DML_EXEC, PGSQL_DML_ASYNC or PGSQL_DML_STRING combined. If PGSQL_DML_STRING is part of the options then query string is returned.

返回值

成功时返回 TRUE, 或者在失败时返回 FALSE。 Returns string if PGSQL_DML_STRING is passed via options.

范例

Example #1 pg_select() example

<?php 
  $db 
pg_connect('dbname=foo');
  
// This is safe, since $_POST is converted automatically
  
$rec pg_select($db'post_log'$_POST);
  if (
$rec) {
      echo 
"Records selected\n";
      
var_dump($rec);
  } else {
      echo 
"User must have sent wrong inputs\n";
  }
?>

参见

  • pg_convert() - 将关联的数组值转换为适合 SQL 语句的格式。

add a note add a note

User Contributed Notes 2 notes

up
1
david dot tulloh at infaze dot com dot au
9 years ago
Valid options are PGSQL_DML_NO_CONV, PGSQL_DML_EXEC, PGSQL_DMP_ASYNC, PGSQL_DML_STRING (pulled out of source code).

This function does not support selecting from multiple tables.  You can get around this by setting the PGSQL_DML_NO_CONV option.  This prevents the error which occurs when the function tries to convert the condition array.

I think it is also important to point out that the table_name field is not safe, particularily with the PGSQL_DML_NO_CONV option.

The arguements array field is compulsory, as documented.  What isn't so clear is that the array has to actually have some values in it, you can't do a select all.

In summary, this function is good for a very small subset of basic queries.  If you are after anything more complex you are better off with pg_query.
up
0
wietse at cj2 dot nl
8 years ago
David mentioned that you can't do a Select all.
However, when executing this script:
<?php
    $conn_string
= "dbname=mydb";
   
$db = pg_connect($conn_string);
   
$selectfields = array("imgid" => "");
   
$records = pg_select($db,"mmsfiles",$selectfields);
   
print_r($records);
?>
...I get this result:
Array
(
    [0] => Array
        (
            [imgid] => 1
            [file] => /home/wietse/public_html/mms/images/1.gif
            [thumb] =>
        )
    [1] => Array
        (
            [imgid] => 2
            [file] => /home/wietse/public_html/mms/images/2.gif
            [thumb] =>
        )
    [2] => Array
        (
            [imgid] => 3
            [file] => /home/wietse/public_html/mms/images/3.gif
            [thumb] =>
        )
    [3] => Array
        (
            [imgid] => 4
            [file] => /home/wietse/public_html/mms/images/4.gif
            [thumb] =>
        )
)
To Top