Question

可能重复：
Unable to update database

我昨天问过这个问题，但我没有回答，所以我想再问一遍。我的代码中的更新语句似乎不起作用。我在数据库中有值，每次使用update语句时，它都不会更新数据库。我已将sqlite数据库复制到我的设备，我正在引用它的路径。这是我用来复制数据库的代码

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
   {

    databaseName = @"databasenew.sql";


   /* copy over to phone code */

    NSString *documentDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,          NSUserDomainMask,YES) objectAtIndex:0]; 
    NSString *sqlFile =[documentDirectory stringByAppendingPathComponent:@"databasenew.sql"];

    if (![[NSFileManager defaultManager] fileExistsAtPath:sqlFile]) {
        NSString *bundleSql = [[NSBundle mainBundle] pathForResource:@"databasenew" ofType:@"sql"];


NSError *error = nil;
[[NSFileManager defaultManager] copyItemAtPath:bundleSql toPath:sqlFile error:&error];

if (error) {
    NSLog(@"Could not copy json file: %@", error);
}
    else{
    NSLog(@"yea");
       }
    }
     else{

NSLog(@"transfer complete");
     }
     NSString *bundleSql = [[NSBundle mainBundle] pathForResource:@"databasenew" ofType:@"sql"];


      databasePath = bundleSql;


    self.window.rootViewController = self.viewController;
    [self.window makeKeyAndVisible];
    return YES;
   }

这是我用来更新数据库的代码，但是虽然它确认它已经执行了sql命令（我在if语句中有了NSLogs，你将在下面看到）但它不会更新数据库。

-(void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *) namespaceURI qualifiedName:(NSString *)qName
 attributes: (NSDictionary *)attributeDict
{

  if ([elementName isEqualToString:@"Message"])
   {
NSLog(soapResults);  
NSString *convertString = soapResults;
check = [convertString intValue];
NSLog(@"user is");
NSLog(user);
if(check > 0){

    databaseName = @"databasenew.sql";
    NSString *bundleSql = [[NSBundle mainBundle] pathForResource:@"databasenew" ofType:@"sql"];
    databasePath = bundleSql;

    sqlite3 *database;

    if(sqlite3_open([databasePath UTF8String], &database) == SQLITE_OK) {
        const char *sqlStatement = "UPDATE people set user = 'munch'";
        sqlite3_stmt *compiledStatement;
        if(sqlite3_prepare_v2(database, sqlStatement, -1, &compiledStatement, NULL) == SQLITE_OK) {
            NSLog(@"success");
            NSLog(soapResults);
            BOOL success = sqlite3_step(compiledStatement);
            if (success != SQLITE_DONE) {
                BOOL myBool=YES; 
                NSLog([NSString stringWithFormat:@"My Bool value : %d",success]); 

            } 
        }else{
            NSLog(@"the fail ispreparing something");

            NSAssert1(0, @"Error while creating update statement. '%s'", sqlite3_errmsg(database));
        }


        sqlite3_finalize(compiledStatement);

    }else{
        NSLog(@"fail");
    }

    sqlite3_close(database);
    NSString *string = [NSString stringWithFormat:@"%d", check];
    NSLog(string);
    NSLog(@"lolololol"); 
    check = 0;
    [self Bootup];

}else{
         UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Problem!" message:@"Incorrect Username or Password"
                                                       delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:@"Yes", nil];
    [alert show];
    [alert release];
     }
    //  gotoContent = checkConfirm;
    }



   if( [elementName isEqualToString:@"ValidateUserResponse"])
  {
if(!soapResults)
{
    soapResults = [[NSMutableString alloc] init];
    NSLog(soapResults);
    NSLog(@"above is soap validate user");
}

recordResults = TRUE;
  }

例如，此代码确认更新，但实际上并未发生更新

 if(sqlite3_open([databasePath UTF8String], &database) == SQLITE_OK) {
    const char *sqlStatement = "UPDATE people set user = 'munch'";
    sqlite3_stmt *compiledStatement;
    if(sqlite3_prepare_v2(database, sqlStatement, -1, &compiledStatement, NULL) == SQLITE_OK) {
        NSLog(@"success");
        NSLog(soapResults);
        BOOL success = sqlite3_step(compiledStatement);
        if (success != SQLITE_DONE) {
            BOOL myBool=YES; 
            NSLog([NSString stringWithFormat:@"My Bool value : %d",success]); 

        }

更新语句无法正常工作

0 个答案: