PHP Unconference Europe 2015

pg_delete

(PHP 4 >= 4.3.0, PHP 5)

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。

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User Contributed Notes 1 note

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1
Anonymous
10 years ago
One should take care when checking the return value.
0 == false which is not equal with failed delete.

if(!$res)
  echo "Nothing was deleted";
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