pg_delete()

(PHP 4 >= 4.3.0, PHP 5, PHP 7)

删除记录

说明

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

pg_delete()删除符合条件的记录，条件在assoc_array中以field=>value格式给出。如果指定了option，则pg_convert()按照该选项作用于assoc_array之上。

参数

$connection: PostgreSQL database connection resource.
$table_name: Name of the table from which to delete rows.
$assoc_array: An array whose keys are field names in the table$table_name, and whose values are the values of those fields that are to be deleted.
$options: Any number of PGSQL_CONV_FORCE_NULL,PGSQL_DML_NO_CONV,PGSQL_DML_EXEC or PGSQL_DML_STRING combined. If PGSQL_DML_STRING is part of the$optionsthen 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_delete()例子

<?php 
  $db = pg_connect('dbname=foo');
  // This is safe, since $_POST is converted automatically
  $res = pg_delete($db, 'post_log', $_POST);
  if ($res) {
      echo "POST data is deleted: $res\n";
  } else {
      echo "User must have sent wrong inputs\n";
  }
?>

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。

参见

pg_convert()将关联的数组值转换为适合 SQL 语句的格式。

One should take care when checking the return value. 
0 == false which is not equal with failed delete. 
if(!$res)
 echo "Nothing was deleted";