Question

With the following code I always got that value on Oracle databases

SQLHSTMT hStmt = SQL_NULL_HANDLE;
SQLRETURN sret;
SQLLEN rowCount = 0;

const SQLHDBC conn = this->getConnection();
if (conn == NULL)
{
    ret = false;
}

SQLAllocHandle(SQL_HANDLE_STMT, conn, &hStmt);
std::string metaTableName="meta_table";

sret=SQLTables( hStmt,
           NULL, 0, /* no specific catalog */
           NULL, 0, /* no specific schema */
           (SQLCHAR *)metaTableName.c_str(), SQL_NTS,
           NULL, 0); /* no specific type - table or view */

if ((sret != SQL_SUCCESS) && (sret != SQL_SUCCESS_WITH_INFO))
{
    std::cout << "Problem retrieving " << metaTableName << " table from database!" << std::endl);
    ret= false;
}

SQLRowCount(hStmt,&rowCount);
std::cout <<std::endl << "Rows: " <<rowCount<<std::endl ;

No error messages so no apparent cause of this behaviour

Using oracle libs:
oracle-instantclient11.2-odbc-11.2.0.1.0-1.x86_64

Any ideas about the reasons of such a behaviour?

Answer 1

SQLRowCount returns the number of rows affected by an UPDATE, INSERT, or DELETE statement; an SQL_ADD, SQL_UPDATE_BY_BOOKMARK, or SQL_DELETE_BY_BOOKMARK operation in SQLBulkOperations; or an SQL_UPDATE or SQL_DELETE operation in SQLSetPos – the value being returned when you are not doing any of these can be ignored.

More information about SQLRowCount can be found the the Micrsoft ODBC documentation