ios - Save image data to sqlite database in iphone -


i want save image data sqlite database can't ... 

- (void) savedata: (article*) article :(nsmutablearray*) rsslist {     sqlite3_stmt *statement;      if (sqlite3_open([self.databasepath utf8string], &articlesdb) == sqlite_ok)     {         nsstring* sqlformat = @"insert articles (guid, title, summary, mainlink, pubdate, author, imagelink, body, favorites, smallimage) values ('%@', '%@', '%@', '%@', '%@', '%@', '%@', '%@', '%@', ?)";         // correct summary.         nsstring* summary = [nsstring stringwithstring:article.summary];         summary           = [summary stringbyreplacingoccurrencesofstring:@"'" withstring:@"''"];         // correct title         nsstring* title   = [nsstring stringwithstring:article.title];         title             = [title stringbyreplacingoccurrencesofstring:@"'" withstring:@"''"];         // correct body         nsstring* body    = [nsstring stringwithstring:article.body];         //body              = [body stringbyreplacingoccurrencesofstring:@"'" withstring:@"''"];         // create insert sql query.         nsstring* insertsql = [nsstring stringwithformat:sqlformat, article.guid, title, summary, article.mainlink, article.pubdate, article.author, article.imagelink, body, article.favorite ? @"yes" : @"no"];         // add database.         sqlite3_prepare_v2(articlesdb, [insertsql utf8string], -1, &statement, null);         if (sqlite3_step(statement) == sqlite_done)         {             // add list.             [rsslist addobject:article];             // write log.             nslog( @"article added ... " );         }          else         {             nslog( @"failed add article. error is:  %s", sqlite3_errmsg(articlesdb) );         }          sqlite3_finalize(statement);         sqlite3_close(articlesdb);     } }

you can see have query , @ end have smallimage , value (?)

@"insert articles (guid, title, summary, mainlink, pubdate, author, imagelink, body, favorites, smallimage) values ('%@', '%@', '%@', '%@', '%@', '%@', '%@', '%@', '%@', ?)";

i have function must update image value somewhere in program: in function select row image link url when try write data last column "smallimage" no result ... when open database file editor see in last row "null" data not saved ...

- (void) savesmallimage: (nsdata*) imgdata :(nsstring*) mainurl {     if (sqlite3_open([self.databasepath utf8string], &articlesdb) == sqlite_ok)      {         nsstring* sqlitequery = [nsstring stringwithformat:@"select * articles imagelink =  '%@'", mainurl];          sqlite3_stmt* statement;          if( sqlite3_prepare_v2(articlesdb, [sqlitequery utf8string], -1, &statement, null) == sqlite_ok )          {             sqlite3_bind_blob(statement, 9, [imgdata bytes], [imgdata length], sqlite_transient);             sqlite3_step(statement);         }         else         {             nslog( @"savebody: failed sqlite3_prepare_v2. error is:  %s", sqlite3_errmsg(articlesdb) );         }          // finalize , close database.         sqlite3_finalize(statement);         sqlite3_close(articlesdb);     }     else      {         nslog(@"savesmallimage: failed sqlite3_open. error is: %s", sqlite3_errmsg(articlesdb) );     } }

who can tell me wrong ...

here how can save image sqlite:

// create images table. sql_stmp = "create table if not exists images (url text unique, image blob)"; if( sqlite3_exec(articlesdb, sql_stmp, null, null, &errmsg) != sqlite_ok )     nslog( @"fail create \"images\" table. error is: %@", errmsg );

and here function save:

// save small image data given main url  - (void) saveimagestosql: (nsdata*) imgdata :(nsstring*) mainurl {     nslog( @"\n*****save image sqlite*****\n" );      const char* sqlitequery = "insert images (url, image) values (?, ?)";     sqlite3_stmt* statement;      if( sqlite3_prepare_v2(articlesdb, sqlitequery, -1, &statement, null) == sqlite_ok )     {         sqlite3_bind_text(statement, 1, [mainurl utf8string], -1, sqlite_transient);         sqlite3_bind_blob(statement, 2, [imgdata bytes], [imgdata length], sqlite_transient);         sqlite3_step(statement);     }     else nslog( @"savebody: failed sqlite3_prepare_v2. error is:  %s", sqlite3_errmsg(articlesdb) );      // finalize , close database.     sqlite3_finalize(statement); }

and here function load images:

// load images data base given image url  - (nsdata*) loadimagesfromsql: (nsstring*) imagelink {     nsdata* data = nil;     nsstring* sqlitequery = [nsstring stringwithformat:@"select image images url = '%@'", imagelink];         sqlite3_stmt* statement;      if( sqlite3_prepare_v2(articlesdb, [sqlitequery utf8string], -1, &statement, null) == sqlite_ok )     {         if( sqlite3_step(statement) == sqlite_row )         {             int length = sqlite3_column_bytes(statement, 0);             data       = [nsdata datawithbytes:sqlite3_column_blob(statement, 0) length:length];         }     }      // finalize , close database.     sqlite3_finalize(statement);      return data;  }

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