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Christoph M. Becker
08073b0658
Firstly, we must not rely on `stmt->column_count` when freeing the driver specific column values, but rather store the column count in the driver data. Since the column count is a `short`, 16 bit are sufficient, so we can store it in reserved bits of `pdo_odbc_stmt`. Furthermore, we must not allocate new column value storage when the statement is not executed, but rather when the column value storage has not been allocated. Finally, we have to introduce a driver specific `cursor_closer` to avoid that `::closeCursor()` calls `odbc_stmt_next_rowset()` which then frees the column value storage, because it may be still needed for bound columns.