The structure of a transaction is comparable to the structure of a procedure or function of a high-level programming language.
Transactions have the following characteristics:
- Nested block structure is possible
- Variables of the native types
number,
float,
boolean and
string and arrays of simple types (array of number, array of float, array of boolean, array of string) can be used
- Variables of a transaction have local scope (can only be used inside the transaction) but global life span
- Transactions cannot call other transactions or themselves
- Random variables or constants can be used as input parameters of transactions
- A transaction has no output parameters
- Full hierarchy of expressions applies with the usual rules of precedence
- You can use
if,
while,
for and
loop statements for flow control
- SQL commands/FORM commands are not declared in the transactions directly but in their own section (SQL section/FORM section)
and are used like variables of special data types
- Wait statements can be used for specifying user times
- Random variables can be used for generating random values