mysqli_stmt::attr_set

mysqli_stmt_attr_set

(PHP 5)

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

说明

Object oriented style (method):

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

Procedural style:

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

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

参数

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	If set to 1, 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.