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pg_delete

(PHP 4 >= 4.3.0, PHP 5, PHP 7, PHP 8)

pg_delete — Deletes records

Description

pg_delete(
 PgSql\Connection $connection,
 string $table_name,
 array $conditions,
 int $flags = PGSQL_DML_EXEC
): string|bool

pg_delete() deletes records from a table specified by the keys and values in conditions.

If flags is specified, pg_convert() is applied to conditions with the specified flags.

By default pg_delete() passes raw values. Values must be escaped or the PGSQL_DML_ESCAPE flag must be specified in flags. PGSQL_DML_ESCAPE quotes and escapes parameters/identifiers. Therefore, table/column names become case sensitive.

Note that neither escape nor prepared query can protect LIKE query, JSON, Array, Regex, etc. These parameters should be handled according to their contexts. i.e. Escape/validate values.

Parameters

connection

An PgSql\Connection instance.

table_name

Name of the table from which to delete rows.

conditions

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.

flags

Any number of PGSQL_CONV_FORCE_NULL, PGSQL_DML_NO_CONV, PGSQL_DML_ESCAPE, PGSQL_DML_EXEC, PGSQL_DML_ASYNC or PGSQL_DML_STRING combined. If PGSQL_DML_STRING is part of the flags then query string is returned. When PGSQL_DML_NO_CONV or PGSQL_DML_ESCAPE is set, it does not call pg_convert() internally.

Return Values

Returns true on success or false on failure. Returns string if PGSQL_DML_STRING is passed via flags.

Changelog

Version Description
8.1.0 The connection parameter expects an PgSql\Connection instance now; previously, a resource was expected.

Examples

Example #1 pg_delete() example

<?php 
  $db = pg_connect('dbname=foo');
  // This is safe somewhat, since all values are escaped.
  // However PostgreSQL supports JSON/Array. These are not
  // safe by neither escape nor prepared query.
  $res = pg_delete($db, 'post_log', $_POST, PG_DML_ESCAPE);
  if ($res) {
      echo "POST data is deleted: $res\n";
  } else {
      echo "User must have sent wrong inputs\n";
  }
?>

See Also

  • pg_convert() - Convert associative array values into forms suitable for SQL statements

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Licensed under the Creative Commons Attribution License v3.0 or later.
https://www.php.net/manual/en/function.pg-delete.php