An Embedded SQL block-structured statement is a statement delimited by the begin and end clauses. For example, the select loop and the unloadtable loop are both block-structured statements. These statements can only be terminated by the methods specified for the particular statement in the SQL Reference Guide. For example, the select loop is terminated either when all the rows in the database result table have been processed or by an endselect statement, and the unloadtable loop is terminated either when all the rows in the forms table field have been processed or by an endloop statement.

Therefore, if you use a whenever statement with the goto action in an SQL block, you must avoid going to a label outside the block. Such a goto would cause the block to be terminated without issuing the runtime calls necessary to clean up the information that controls the loop. (For the same reason, you must not issue a BASIC exit or goto statement that causes control to leave or enter an SQL block.) The target label of the whenever goto statement should be a label in the block. If, however, it is a label for a block of code that cleanly exits the program, the above precautions need not be taken.

The above information does not apply to error handling for database statements issued outside an SQL block nor to explicit hard-coded error handling. For an example of hard-coded error handling, see The Table Editor Table Field Application in this chapter.