Loop statement (foreach)

BI# is built for data-heavy applications and its foreach statement allows easy iteration over large sets of data. This example of a function uses the foreach statement to loop over the result set of an SQL query:

void Process(SQLConnection connection)
{ 
	SQLData resultData = SQLExecuteQuery(
 	connection,
		"Select * from employees"
	);
	foreach (SQLDataRow row in resultData)
	{ 
		string name = SQLDataRowGetString(row,"name");
		WriteLine("Name: " + name); 
	}
}

When iterating over lists of data you often must filter elements. You can use if statements for this purpose, but foreach supports a where clause that solves this problem more elegantly:

void Process(OLAPConnection con)
{ 
	OLAPElementList list = OLAPGetElementList(con,"DACOUNT", true);
	foreach (OLAPElement account in list
		where OLAPGetStringAttribute(account, "ALRE") == "A")
	{ 
		// Do something with account. 
	}
}

The foreach statement has this structure:

foreach (<type> <name> in <list expression>
[where <condition>]) <block>

The statement creates a local variable named name of the specified type. For each iteration, BI# fills this variable with the next item from the list expression. For every list type, BI# allows a certain set of iterator variable types. This table lists possible combinations of iterator variable types and list types:

If you do not specify a where clause or if the where clause's condition is true, BI# runs the loop's block. Otherwise, it starts the next iteration.