Sql Commit - HEIDENHAIN TNC 320 User Manual

8
Programming: Q Parameters
8.9 Accessing tables with SQL commands

SQL COMMIT

SQL COMMIT transfers all rows in the result set back to the table. A
lock set with SELECT...FOR UPDATE is canceled.
The handle given in the SQL SELECT command loses its validity.
Parameter no. for result: Q parameter in which the
SQL server reports the result:
0: no error
1: error occurred (erroneous handle or identical
entries in columns in which unique entries are
required)
Database: SQL access ID: Q parameter with the
handle
SELECT)
SQL ROLLBACK
How SQL ROLLBACK is executed depends on whether INDEX is
programmed:
If INDEX is not programmed: The result set is
the table (any changes/insertions are discarded). The transaction
is closed and the handle given in the SQL SELECT command
loses its validity. Typical application: Ending a transaction solely
containing read-accesses.
If INDEX is programmed: The indexed row remains. All other rows
are deleted from the result set. The transaction is
A lock set with SELECT...FOR UPDATE remains for the indexed
row. For all other rows it is reset.
Parameter no. for result: Q parameter in which the
SQL server reports the result:
0: no error
1: error occurred (erroneous handle)
Database: SQL access ID: Q parameter with the
handle
SELECT)
Database: Index for SQL result: Row that is
to remain in the result set. Either enter the row
number directly or program the Q parameter
containing the index
278
for identifying the result set (also see SQL
not
for identifying the result set (also see SQL
TNC 320 | User's Manual HEIDENHAIN Conversational Programming | 5/2013
11SQL BIND Q881
"TAB_EXAMPLE.MEAS_NO"
12SQL BIND Q882
"TAB_EXAMPLE.MEAS_X"
13SQL BIND Q883
"TAB_EXAMPLE.MEAS_Y"
14SQL BIND Q884
"TAB_EXAMPLE.MEAS_Z"
. . .
20SQL Q5 "SELECT
MEAS_NO,MEAS_X,MEAS_Y, MEAS_Z
FROM TAB_EXAMPLE"
. . .
30 SQL FETCH Q1HANDLE Q5 INDEX
+Q2
. . .
40 SQL UPDATEQ1 HANDLE Q5 INDEX
+Q2
. . .
50 SQL COMMITQ1 HANDLE Q5
11SQL BIND Q881
"TAB_EXAMPLE.MEAS_NO"
12SQL BIND Q882
written back to
"TAB_EXAMPLE.MEAS_X"
13SQL BIND Q883
"TAB_EXAMPLE.MEAS_Y"
14SQL BIND Q884
"TAB_EXAMPLE.MEAS_Z"
not concluded.
. . .
20SQL Q5 "SELECT
MEAS_NO,MEAS_X,MEAS_Y, MEAS_Z
FROM TAB_EXAMPLE"
. . .
30 SQL FETCH Q1HANDLE Q5 INDEX
+Q2
. . .
50 SQL ROLLBACKQ1 HANDLE Q5