When a call level interface (CLI) application sets the statement
attribute
SQL_ATTR_INSERT_BUFFERING=SQL_ATTR_INSERT_BUFFERING_IGD and a
row, that violates a uniqueness constraint, is inserted in an
array input chain, the application ought to get the return
value SQL_SUCCESS_WITH_INFO when the CLI array input chain is
ended. And then when the application calls SQLRowCount, it ought
to report just the number of rows that were successfully
inserted, not including any rows that were rejected for
violating a uniqueness constraint.
As a result of this defect, the application gets the return
value SQL_SUCCESS when the CLI array input chain is ended, and
SQLRowCount reports the total number of executions of the INSERT
statement, including those which violated a uniqueness
constraint.
This defect only affects applications that connect to a database
that has more than one database partition. This defect does not
affect DB2 Version 9.5 for Linux, UNIX and Windows before Fix
Pack 5.
The following pseudocode illustrates the problem.
SQLRETURN sql_rc;
SQLHANDLE hinsert;
SQLINTEGER insertcount;
/*
Assuming that hinsert is a statement handle that has been
allocated,
set the statement attribute
SQL_ATTR_INSERT_BUFFERING=SQL_ATTR_INSERT_BUFFERING_IGD.
*/
sql_rc = SQLSetStmtAttr( hinsert, SQL_ATTR_INSERT_BUFFERING,
(SQLPOINTER) SQL_ATTR_INSERT_BUFFERING_IGD, 0 );
/* Prepare an INSERT statement. */
sql_rc = SQLPrepare( hinsert, "INSERT INTO MYTEST ( I )
VALUES( ? )", SQL_NTS );
/* Bind the parameters for the INSERT statement. */
sql_rc = SQLExtendedBind( hinsert, ... );
/* Begin an array input chain. */
sql_rc = SQLSetStmtAttr( hinsert, SQL_ATTR_CHAINING_BEGIN,
(SQLPOINTER) TRUE, 0 );
/* Insert rows, at least one of which violate a uniqueness
constraint. */
sql_rc = SQLExecute( hinsert );
sql_rc = SQLExecute( hinsert );
/*
End the array input chain.
This ought to set sql_rc to SQL_SUCCESS_WITH_INFO if any of
the rows that were inserted violate
a uniqueness constraint. But because of the defect it sets
sql_rc to SQL_SUCCESS.
*/
sql_rc = SQLSetStmtAttr( hinsert, SQL_ATTR_CHAINING_END,
(SQLPOINTER) TRUE, 0 );
printf( "SQL_ATTR_CHAINING_END returned sql_rc=%d\n", sql_rc);
/*
Call SetRowCount to set insertcount to the number of rows
affected.
This statement ought to set insertcount to just the number of
rows that were inserted successfully.
But because of the defect it sets insertcount to the total
number of INSERT statements that were
executed, including those which were rejected for violating
the uniqueness constraint.
*/
SQLRowCount( hinsert, &insertcount );
printf( "SQLRowCount returned %d inserted rows\n", insertcount
); |
