FMDB（SQL）试图从数据库（iOS）获取数组

我需要加载数据库：shortSelected-string，array-array-of-string，date-date

我从shortSelectedit字符串加载数据库，该字符串总是不同的，并且数据库具有所有这些值，我将shortSelected传递给数据库，但在3字符串resultSet=nil中。怎么了

FMDatabase *database = [FMDatabase sharedInstance];
NSMutableArray *results = [NSMutableArray array];
FMResultSet *resultSet = [database executeQuery:@"SELECT * FROM rss WHERE name = shortSelected"];
NSArray *resultArray = [resultSet objectForColumnName:@"array"];
NSDate *resultDate = [resultSet dateForColumn:@"date"];
[results addObject:resultArray];
[results addObject:resultDate];
self.data = results;
NSLog(@"%@", _data[0][shortSelected]);

您需要调用next方法来确认集合中是否有数据，然后读取数据。代码应该是

while([resultSet next])
{
   NSArray *resultArray = [resultSet objectForColumnName:@"array"];
   NSDate *resultDate = [resultSet dateForColumn:@"date"];
   [results addObject:resultArray];
   [results addObject:resultDate];
}