iOS 检索 sqlite3 数据并将其存储在 NSObject 数组中

Question

我可能做错了，因为我对 Objective C 还是个新手。

我正在尝试从 sqlite3 数据库中检索数据并将其存储在 NSObject 数组中。

这是我的实现文件中的 viewDidLoad 方法。

- (void)viewDidLoad
{
    [super viewDidLoad];

    clients = [[NSMutableArray alloc] init];
    [self openDB];
    NSString *sql = [NSString stringWithFormat:@"SELECT * FROM clients"];
    sqlite3_stmt *statement;

    if(sqlite3_prepare_v2(db, [sql UTF8String], -1, &statement, nil)==SQLITE_OK)
    {
        while (sqlite3_step(statement)==SQLITE_ROW) {
            char *field1 = (char *) sqlite3_column_text(statement, 0);
            NSString *field1Str = [[NSString alloc]initWithUTF8String:field1];

            char *field2 = (char *) sqlite3_column_text(statement, 1);
            NSString *field2Str = [[NSString alloc]initWithUTF8String:field2];

            char *field3 = (char *) sqlite3_column_text(statement, 2);
            NSString *field3Str = [[NSString alloc]initWithUTF8String:field3];

            char *field4 = (char *) sqlite3_column_text(statement, 3);
            NSString *field4Str = [[NSString alloc]initWithUTF8String:field4];

            char *field5 = (char *) sqlite3_column_text(statement, 4);
            NSString *field5Str = [[NSString alloc]initWithUTF8String:field5];

            char *field6 = (char *) sqlite3_column_text(statement, 5);
            NSString *field6Str = [[NSString alloc]initWithUTF8String:field6];

            char *field7 = (char *) sqlite3_column_text(statement, 6);
            NSString *field7Str = [[NSString alloc]initWithUTF8String:field7];

            char *field8 = (char *) sqlite3_column_text(statement, 7);
            NSString *field8Str = [[NSString alloc]initWithUTF8String:field8];

            char *field9 = (char *) sqlite3_column_text(statement, 8);
            NSString *field9Str = [[NSString alloc]initWithUTF8String:field9];


            ClientObj *c1 = [[ClientObj alloc] initWithCompanyName:field1Str firstName:field2Str lastName:field3Str email:field4Str workPhone:field5Str mobilePhone:field6Str streetAddress:field7Str city:field8Str postalCode:field9Str];
        }
    }

    self.clients = [NSArray arrayWithObjects:c1,c2,c3,c4, nil];

}

我试图在每次 while 语句循环遍历数据库时递增 *c1。例如。 c1, c2,c3, c4

然后我尝试将从上面的数据库循环创建的每个 ClientObj 添加到客户端数组，但我不确定如何执行此操作。

非常感谢任何帮助或建议

Answer 1

在循环之前初始化一次数组:

self.clients = [[NSMutableArray alloc] init];

然后只需将每个客户端对象添加到循环内的数组中:

while (sqlite3_step(statement) == SQLITE_ROW) {
    // ...
    ClientObj *c = [[ClientObj alloc] initWithCompanyName:field1Str firstName:field2Str lastName:field3Str email:field4Str workPhone:field5Str mobilePhone:field6Str streetAddress:field7Str city:field8Str postalCode:field9Str];
    [self.clients addObject:c];
}