预定义常量

下列常量由此扩展定义，且仅在此扩展编译入 PHP 或在运行时动态载入时可用。

The following constants to use with maxdb_options() are defined. For further description of these constants see » http://maxdb.sap.com/documentation/.

**MaxDB PHP client constants**
常量	说明
MAXDB_COMPNAME	The component name used to initialise the SQLDBC runtime environment.
MAXDB_APPLICATION	The application to be connected to the database.
MAXDB_APPVERSION	The version of the application.
MAXDB_SQLMODE	The SQL mode.
MAXDB_UNICODE	`TRUE`, if the connection is an unicode (UCS2) client or `FALSE`, if not.
MAXDB_TIMEOUT	The maximum allowed time of inactivity after which the connection to the database is closed by the system.
MAXDB_ISOLATIONLEVEL	Specifies whether and how shared locks and exclusive locks are implicitly requested or released.
MAXDB_PACKETCOUNT	The number of different request packets used for the connection.
MAXDB_STATEMENTCACHESIZE	The number of prepared statements to be cached for the connection for re-use.
MAXDB_CURSORPREFIX	The prefix to use for result tables that are automatically named.

The function maxdb_fetch_array() uses a constant for the different types of result arrays. The following constants are defined:

**MaxDB fetch constants**
常量	说明
MAXDB_ASSOC	Columns are returned into the array having the fieldname as the array index.
MAXDB_ASSOC_UPPER	Columns are returned into the array having the upper case fieldname as the array index.
MAXDB_ASSOC_LOWER	Columns are returned into the array having the lower case fieldname as the array index.
MAXDB_BOTH	Columns are returned into the array having both a numerical index and the fieldname as the array index.
MAXDB_NUM	Columns are returned into the array having a numerical index to the fields. This index starts with 0, the first field in the result.

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