Dbgl

Conditional Statements

• ALWAYS <command list>
• IF <logical expression> THEN <command list>
• OTHERWISE ALWAYS <command list>
• OTHERWISE IF <logical expression> THEN <command list>

Logical Expressions

A logical expression is made up of one or more database expressions, arithmetic expressions or string expressions combined using various operators.

Database Expressions

• NO_MORE_DATA(DB)
• Logical. This function is true when the end of the database has been reached.
  
• CURRENT_RECORD(<record variable name>)
• True if the current record is specified as the argument.
• FIRST_RECORD(DB)
• FIRST_RECORD(RC)
• FINISHED_RECORD(RC)
• CHANGED_RECORD_TYPE(RC)
• INCLUSIVELY_BETWEEN(L1,L2)
• EXCLUSIVELY_BETWEEN(L1,L2)
• BETWEN_OR_AT(L1,L2)
• AT_OR_UNTIL(L1,L2)
• START_OF_RANGE(L1,L2)
• FINISHED_RANGE(L1,L2)
• INSIDE(REGION,X,Y)
• EDGE(REGION,X,Y)
• VERTEX(REGION,X,Y)