Re: Inserting a BLOB using MySQL++
Thi Cao writes: All, I created a C++ class containing a variety of member variables of varying types such as float, int, char *, etc. If I instantiate an object of this class, how should I insert this object into my database table? I can retrieve the individual members and insert them that way, but I feel it would be more efficient to insert the object as a BLOB, but I don't exactly know how to do that. Basically, I want to insert the object as is so that I can retrieve it as is and not have to bother with calling the member setting functions to populate the class members. I looked at the MySQL++ example for loading a binary file, but am unsure how to apply that to my needs. I also looked through the mail archives and was unsuccessful in finding a solution, so any assistance would be much appreciated. Thanks in advance. Regards, Thi Hi! Take a look in reset_db.cc and load_file.cc example files. In any case, you always have to escape a binary string prior to inserting it. As it is seen in cgi_image.cc example, you will always get back from MySQL your BLOB in en-escaped, original form. -- Regards, __ ___ ___ __ / |/ /_ __/ __/ __ \/ /Mr. Sinisa Milivojevic [EMAIL PROTECTED] / /|_/ / // /\ \/ /_/ / /__ MySQL AB, Fulltime Developer /_/ /_/\_, /___/\___\_\___/ Larnaca, Cyprus ___/ www.mysql.com - Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail [EMAIL PROTECTED] To unsubscribe, e-mail [EMAIL PROTECTED] Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
Re: Inserting a BLOB using MySQL++
Probably the best bet would be to write the individual attributes to respective database columns. It keeps a few things simpler. It would also allow you to update the database from multible sources (many threads, or many users on the database). Other wise, you would have to serialize the object to a binary object and write that to the BLOB field. When you imported it back, you would have to deserialize. Some languages call this pickeling. As I have not touched C++ code for a while, I'm not sure what classes are availible to do this for you. The BLOB way of doing it would force you read/write the entire thing everytime you update the object, unless you are just using the database to store it for backup. -Opus On 22 Apr 2002 at 8:21, Thi Cao wrote: All, I created a C++ class containing a variety of member variables of varying types such as float, int, char *, etc. If I instantiate an object of this class, how should I insert this object into my database table? I can retrieve the individual members and insert them that way, but I feel it would be more efficient to insert the object as a BLOB, but I don't exactly know how to do that. Basically, I want to insert the object as is so that I can retrieve it as is and not have to bother with calling the member setting functions to populate the class members. I looked at the MySQL++ example for loading a binary file, but am unsure how to apply that to my needs. I also looked through the mail archives and was unsuccessful in finding a solution, so any assistance would be much appreciated. Thanks in advance. Regards, Thi --Opus-- Government is not reason, it is not eloquence- it is force. - George Washington Get added to my Humor list: mailto:[EMAIL PROTECTED]?subject=ADD_HUMOR Get added to my Neat list: mailto:[EMAIL PROTECTED]?subject=ADD_NEAT Get my PGP public key: mailto:[EMAIL PROTECTED]?subject=PSENDbody=send%20PublicKEY.asc Visit My Home Page: http://value.net/~opus/ - Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail [EMAIL PROTECTED] To unsubscribe, e-mail [EMAIL PROTECTED] Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
