Advanced Queuing - Oracle

General Features of JMS
The primitive types can be written explicitly using methods for each type. They
may also be written generically as objects. To use Bytes Messages, create the queue
table with SYS.AQ$_JMS_BYTES_MESSAGE or AQ$_JMS_MESSAGE payload types.
Map Message
A MapMessage is used to send a set of name-value pairs where names are Strings
and values are Java primitive types. The entries can be accessed sequentially or
randomly by name. The order of the entries is undefined. It inherits from Message
and adds a map message body. The primitive types can be read or written explicitly
using methods for each type. They may also be read or written generically as
objects.
To use Map Messages, create the queue table with the SYS.AQ$_JMS_MAP_
MESSAGE or AQ$_JMS_MESSAGE payload types. Map messages support the
following conversion table. A value written as the row type can be read as the
column type.
Table 12–5 Map Message Conversion
boolean byte short char int long float double String byte[]
boolean X - - - - - - - X -
byte - X X - X X - - X -
short - - X - X X - - X -
char - - - X - - - - X -
int - - - - X X - - X -
long - - - - - X - - X -
float - - - - - - X X X -
double - - - - - - - X X -
String X X X X X X X X X -
byte[] - - - - - - - - - X
Text Message
A TextMessage is used to send a message containing a
java.lang.StringBuffer. It inherits from Message and adds a text message
body. The text information can be read or written using methods getText() and
setText(...). To use Text Messages, create the queue table with the SYS.AQ$_
JMS_TEXT_MESSAGE or AQ$_JMS_MESSAGE payload types.
12-28 Oracle9i Application Developer’s Guide - Advanced Queuing