HEIDENHAIN MANUALplus 620 Technical Manual page 1635

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8.12.7 PLC modules for the SQL statements

January 2012

Module 9440 Open a transaction

Module 9440 executes the SELECT statement that is given to the module. For

a description of the supported queries, see "SELECT" on page 1628. If the

statement was executed successfully, a transaction is opened and its handle

is returned. This handle can be used to read data from a machine table (tool

table, for example), or to change data in the table. The cursor is placed on the

first record of the result set. In order to save changes to the tables, the

transaction must be concluded and closed with Module 9441 after changing

the records.

If the statement contains a string :'Bnnn' or :'Wnnn' or :'Dnnn' (with nnn

reading as number from 0 to the maximal number of BYTEs, WORDs or

DWORDs respectively), this string is replaced by the integer value found in the

associated PLC data.

Constraints:

The module can only be executed within a submit job.

No more than 10 transactions may be open at the same time.

Possible errors:

The module was not called in a submit job

The statement is syntactically not correct

The table given does not exist, is not accessible or is fully or partially locked

The columns given do not exist within the table

No records were selected

B/W/D/K/S<Valid SQL statement>

For the meaning of the error number, see "Return codes of

PLC Modules 9440 to 9459 (error stack)" on page 1652.

Error recognition:

NN_GenApiModule

Transaction was successfully opened

Error. See <Error number>