pg_delete

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

pg_delete — 删除记录

说明

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

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 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_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。

User Contributed Notes

27-Apr-2004 12:47


One should take care when checking the return value. 

0 == false which is not equal with failed delete. 



if(!$res)

  echo "Nothing was deleted";