//监测数据库中我要需要的表是否已经存在	NSString *existsSql = [NSString stringWithFormat:@"select count(name) as countNum from sqlite_master where type = 'table' and name = '%@'", @"Member" ];	FMResultSet *rs = [membersDB executeQuery:existsSql];		if ([rs next]) {		NSInteger count = [rs intForColumn:@"countNum"];		NSLog(@"The table count: %li", count);		if (count == 1) {			NSLog(@"存在");			return;		}        }

 

//检测某个数据是否存在 FMResultSet *rs =[membersDB executeQuery:@"SELECT COUNT(Name) AS countNum FROM Member WHERE Name = ?",self.nameTextField.text];	while ([rs next]) {		NSInteger count = [rs intForColumn:@"countNum"];		if (count > 0) {		       //存在		}		else		{			//不存在		}	}