# mysqli_stmt::attr_set

# mysqli_stmt_attr_set

(PHP 5, PHP 7)

mysqli_stmt::attr_set -- mysqli_stmt_attr_set — Used to modify the behavior of a prepared statement

### Description

Object oriented style

public mysqli_stmt::attr_set ( int `$attr` , int `$mode` ) : bool

Procedural style

mysqli_stmt_attr_set ( mysqli_stmt `$stmt` , int `$attr` , int `$mode` ) : bool

Used to modify the behavior of a prepared statement. This function may be called multiple times to set several attributes.

### Parameters

`stmt`

  Procedural style only: A statement identifier returned by mysqli_stmt_init().

`attr`

  The attribute that you want to set. It can have one of the following values:

  Attribute values
  Character | Description
  --- | ---
  MYSQLI_STMT_ATTR_UPDATE_MAX_LENGTH | Setting to `TRUE` causes mysqli_stmt_store_result() to update the metadata `MYSQL_FIELD->max_length` value.
  MYSQLI_STMT_ATTR_CURSOR_TYPE | Type of cursor to open for statement when mysqli_stmt_execute() is invoked. `mode` can be `MYSQLI_CURSOR_TYPE_NO_CURSOR` (the default) or `MYSQLI_CURSOR_TYPE_READ_ONLY`.
  MYSQLI_STMT_ATTR_PREFETCH_ROWS | Number of rows to fetch from server at a time when using a cursor. `mode` can be in the range from 1 to the maximum value of unsigned long. The default is 1.

  If you use the `MYSQLI_STMT_ATTR_CURSOR_TYPE` option with `MYSQLI_CURSOR_TYPE_READ_ONLY`, a cursor is opened for the statement when you invoke mysqli_stmt_execute(). If there is already an open cursor from a previous mysqli_stmt_execute() call, it closes the cursor before opening a new one. mysqli_stmt_reset() also closes any open cursor before preparing the statement for re-execution. mysqli_stmt_free_result() closes any open cursor.

  If you open a cursor for a prepared statement, mysqli_stmt_store_result() is unnecessary.

`mode`

  The value to assign to the attribute.

### See Also

- » Connector/MySQL mysql_stmt_attr_set()