property.netbarcode.com | ||
ASP.NET Web PDF Document Viewer/Editor Control Librarysing the step-by-step approach explained in 7, you can inject managed code parts into a C++ project Due to the source code compatibility, you can easily call from native code to managed code by just declaring the functions you want to call However, in the samples discussed so far, the managed functions called from native code and the native functions called from managed code have had void as a return type, and no arguments For nontrivial scenarios, functions with less simplistic signatures are obviously needed The first important thing you have to understand is that if you compile to native code, your source code cannot use managed types at all Just as C doesn t know anything about C++ classes, C++ doesn t know about managed types In the other direction, the situation looks better. how to put barcode in excel 2010, excel2010 microsoft barcode control 9.0, how to convert to barcode in excel 2010, excel barcode add-in from tbarcode office, barcode add in for excel 2010, barcode in excel einlesen, free barcode addin for excel 2010, free barcode generator excel 2007, how to get barcode in excel 2010, excel barcode generator freeware,Although you see three versions in the output, only one of the row versions is true as of the SCN you re interested in So, which version is it Let s read the query output from top to bottom Pay particular attention to the START_SCN and the END_SCN columns All rows will have a START_SCN, but they may have a null value for the END_SCN if the version of the row still exists at the current SCN The first row, which inserted (OPERATION I) empname Nick at SCN 2266, is the latest version of the row Since the END_SCN is null for the first row, you know that this row still existed at SCN 7920. If you look under the OPERATION column, you see the letter D for the second version (START_SCN 0864), indicating that the middle row was deleted (probably accidentally), and the row didn t exist at SCN 7920 The first row thus reflects the fact that the row was reinserted, with a different employee s name The bottom or third row has an END_SCN number, so clearly this row expired at SCN 0864 This was the originally inserted version of this row, as indicated by the value I (insert) under the OPERATION column.. Note You must substitute VERSIONS BETWEEN TIMESTAMP . . . for the VERSIONS BETWEEN SCN nn AND nn clause to use time stamps to specify the time interval for retrieving the various versions of a row instead of To run the ed script, use one of the following two lines, depending on whether your password entries live in the passwd or the shadow file. The same ed script can be used to replace the encrypted password within the passwd or shadow file whichever applies. As you can see, my example uses the shadow file. More information on how to modify files using ed can be found in 25. Here are the main limitations of the Flashback Versions Query feature: You can only use the feature to query actual tables, not views. You can t apply the VERSIONS clause across DDL operations. The query will ignore purely physical row changes as happen, for example, during a segment shrink operation. You can t use this feature if you re dealing with external or temporary tables. If you want to query past data at a precise time, you must use an SCN, since the actual time might be up to three seconds earlier or later than the time you specify with a time stamp. Oracle Database 10g uses SCNs internally and maps them to time stamps with a granularity of three seconds. This potential gap between an SCN and a time stamp may cause problems when you re trying to flash back to an exact time that immediately follows a DDL operation. Suppose you created a new table. If you use a time stamp, your Flashback Versions Query might start a little before the exact time the table was created and miss the new table entirely. You ll end up with an error in this case instead of the Flashback Version Query results. By using an SCN instead of a time stamp, you can avoid this problem.
|