HEIDENHAIN MANUALplus 620 Technical Manual page 1622

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Reading data

Editing data

In order to read the selected data, use SQL BIND to bind the data of a column

to a parameter that accesses the data from the NC program.

The data can be bound to a Q parameter (e.g. SQL BIND Q5 'TOOL.L') or

directly to a system datum of the interpreter (e.g.

SQL SYSBIND ID350 NR52 IDX 1 'PROBE.L'). When a row is read, the content

of the respective columns is stored in the bound parameter. To cancel the

binding, it must be programmed again without specifying a column. The

bindings are globally effective and must be canceled explicitly. The bindings

must be unambiguous. The attempt to bind more than one parameter to a

column will fail.

Use SQL FETCH to read the data of the result row by row. The result set is

identified by the indicated handle. It is therefore possible to read various

result sets alternately. An index in the range from 0 to n can be defined for the

result-set row to be read. If no index is specified, the first row is read. The

result of the function is 0 if data was read and stored in the bound parameters.

The result of the function does not equal 0 if no data was read.

If you want to edit data, you first have to edit the data in the bound parameters.

The SQL UPDATE command, copies the data into the result set which is

identified by the handle. An index in the range from 0 to n can be defined for

the result-set row to be written. If no index is specified, the first row is edited.

The result of the function is 0 if the data have correctly been transferred to the

result set. The result of the function is not 0 if an error occurred during

Afterwards the changes are only visible within the edited result set. If you

reread the edited row, the edited data are shown; if you enter a new query and

reread the row, the original data will be shown. Third parties will still see the

original data. The data is not transferred to the table until the transaction has

been concluded. Thus it is possible to edit more than one row in a consistent

manner in one transaction.

HEIDENHAIN Technical Manual MANUALplus 620