Objective c 如何在另一个方法中读取一个方法中的值

下面是我正在使用的代码

- (void) readDataFromDatabase{

    sqlite3 *database;
    persons = [[NSMutableArray alloc]init];

    if (sqlite3_open([databasePath UTF8String], &database) == SQLITE_OK){

        const char *sqlStatement = "select * from sdata";
        sqlite3_stmt *compiledStatement;
        if (sqlite3_prepare_v2(database, sqlStatement, -1, &compiledStatement, NULL) == SQLITE_OK){

            while (sqlite3_step(compiledStatement) == SQLITE_ROW) {

                pID = sqlite3_column_int(compiledStatement, 0);
                pName = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 1)];
                pAdd = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 2)];
                pPh = sqlite3_column_int(compiledStatement, 3);
                pCp = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 4)];
                pLat = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 5)];
                pLong = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 6)];

                Person *temp = [[Person alloc]initWithID:pID name:pName address:pAdd phone:pPh contactperson:pCp fLat:pLat fLong:pLong];


                [persons addObject:temp];
                NSLog(@"Inside Persons : %@",persons);
                [temp release];

            }

        }
        sqlite3_finalize(compiledStatement);
    }
    sqlite3_close(database);
}
For the NSLog in  NSLog(@"Inside Persons : %@",persons);i get the output as Inside Persons : ("<Person: 0x4c26ae0>"

- (void)startTest
{

    for(int j=0;j<[persons count];j++){

        Person *arr = [persons objectAtIndex:j];


        NSString *s = [[NSString alloc]initWithFormat:@"%f",arr.fLat] ;
        NSLog(@" data in array : %@", s);
    }


#define COORDS_COUNT 1
#define RADIUS       100.0f

    CLLocationCoordinate2D coords[COORDS_COUNT] = {
        CLLocationCoordinate2DMake([arr.fLat floatValue], [arr.fLong floatValue ]),


    };

    CLLocationCoordinate2D center = CLLocationCoordinate2DMake([lat floatValue], [longt floatValue]); 
    CLRegion *region = [[CLRegion alloc] initCircularRegionWithCenter:center radius:RADIUS identifier:@"Banashankari"];



    for (int i = 0; i < COORDS_COUNT; i++)
    {
        CLLocationCoordinate2D coord = coords[i];

        NSString *coordString = [NSString stringWithFormat:@"%f,%f",coord.latitude, coord.longitude];
        [dataArray addObject:coordString];

        if ([region containsCoordinate:coord])
        {
            NSLog(@"location %f, %f is within %.0f meters of coord %f, %f", coord.latitude, coord.longitude, RADIUS, center.latitude, center.longitude);
            [resultArray addObject:coordString];
            NSLog(@"data in resultArray %@",resultArray);
        }
        else 
        {
            NSLog(@"location %f, %f is not within %.0f meters of coord %f, %f", coord.latitude, coord.longitude, RADIUS, center.latitude, center.longitude);    

        }
    }
}

-（void）从数据库读取数据{
sqlite3*数据库；
persons=[[NSMutableArray alloc]init]；
if（sqlite3_打开（[databasePath UTF8String]，&database）==SQLITE_正常）{
const char*sqlStatement=“select*from sdata”；
sqlite3_stmt*编译语句；
if（sqlite3\u prepare\u v2（数据库，sqlStatement，-1，&compiledStatement，NULL）==SQLITE\u OK）{
while（sqlite3_步骤（compiledStatement）==SQLITE_行）{
pID=sqlite3\u column\u int（compiledStatement，0）；
pName=[NSString stringWithUTF8String:（char*）sqlite3\u column\u text（compiledStatement，1）]；
pAdd=[nsstringwithutf8string:（char*）sqlite3\u column\u text（compiledStatement，2）]；
pPh=sqlite3\u column\u int（compiledStatement，3）；
pCp=[NSString stringWithUTF8String:（char*）sqlite3_column_text（compiledStatement，4）]；
pLat=[nsstringwithutf8string:（char*）sqlite3\u column\u text（compiledStatement，5）]；
pLong=[nsstringwithutf8string:（char*）sqlite3\u column\u text（compiledStatement，6）]；
Person*temp=[[Person alloc]initWithID:pID name:pName地址：pAdd电话：pPh联系人：pCp平面：pLat fLong:pLong]；
[人员添加对象：临时]；
NSLog（@“内部人员：%@”，人员）；
[临时释放]；
}
}
sqlite3_最终确定（编译语句）；
}
sqlite3_关闭（数据库）；
}
对于NSLog中的NSLog（@“内部人员：%@”，人员）；我以内部人员的身份获取输出：（“”
-（无效）开始测试
{
对于（int j=0；j为
nsmutablearray
人员使用@property（非原子，retain）？还尝试检查是否在数组中获取值。在数组填充值后使用retain。
我已为nsmutablearray人员使用@property（非原子，retain）。之后如何保留可变数组[persons addObject:temp]；还尝试检查是否在数组中获取值？？我还尝试在[persons addObject:temp]之后保留可变数组；但未获取值persons的输出。使用NSLog并检查。persons输出在persons:（“”）内。