Using Caché Multi-Dimensional Storage - InterSystems ...

Managing Transactions
// Erase any existing data
Kill ^Data
// Set var to an global reference expression
Set var = "^Data(100)"
// Now use indirection to set ^Data(100)
Set @var = "This data was set indirectly."
// Now display the value directly:
Write "Value: ",^Data(100)
You can also use subscript indirection to mix expressions (variables or literal values) within
indirect statements:
// Erase any existing data
Kill ^Data
// Set var to a subscript value
Set glvn = "^Data"
// Now use indirection to set ^Data(1) to ^Data(10)
For i = 1:1:10 {
Set @glvn@(i) = "This data was set indirectly."
}
// Now display the values directly:
Set key = $Order(^Data(""))
While (key '= "") {
Write "Value ",key, ": ", ^Data(key),!
Set key = $Order(^Data(key))
}
Indirection is a fundamental feature of Caché ObjectScript; it is not limited to global references.
For more direct information, you can refer to the “Indirection” section in the “Operators”
chapter of Using Caché ObjectScript. Indirection is less efficient than direct access, so you
should use it judiciously.
3.11 Managing Transactions
Caché provides the primitive operations needed to implement full transaction processing
using globals. Caché Objects and SQL make use of these features automatically. If you are
directly writing transactional data into globals you can make use of these operations.
The transaction commands are TSTART, which defines the start of a transaction; TCOMMIT,
which commits the current transaction; and TROLLBACK, which aborts the current transaction
and undoes any changes made to globals since the start of the transaction.
Using Caché Multi-Dimensional Storage 29