ios存储数据的几种方式

#define ARCHIVE_FILE_PATH @"archive"
#define NUMBER_KEY @"number"

- (void)encodeWithCoder:(NSCoder *)aCoder{
    NSLog(@"in encode with coder");
    NSNumber *num = [[NSNumber numberWithInteger:self.page] autorelease];
    [aCoder encodeObject:num forKey:NUMBER_KEY];
}

- (id)initWithCoder:(NSCoder *)aDecoder {
    NSLog(@"in init with coder");
    if (self = [super init]) {
        NSNumber *num = [aDecoder decodeObjectForKey:NUMBER_KEY];
        page = [num integerValue];
    }
    return self;
}

- (id)copyWithZone:(NSZone *)zone {
    NSLog(@"in copy with zone");
    StickyNotesViewController *controller = [[[[self class] allocWithZone:zone] init] autorelease];
    NSNumber *num = [[NSNumber numberWithInteger:self.page] autorelease];
    controller.page = [[num copyWithZone:zone] integerValue]; 
    return controller;
}

//Read
- (void)restoreDataWithObjectArchive {
    NSString *path = [self dataFilePathWithName:ARCHIVE_FILE_PATH];
    if ([[NSFileManager defaultManager] fileExistsAtPath:path]) {
        NSData *data = [[NSMutableData alloc] initWithContentsOfFile:path];
        NSKeyedUnarchiver *unarchive = [[NSKeyedUnarchiver alloc] initForReadingWithData:data];
        StickyNotesViewController *controller = [unarchive decodeObjectForKey:NUMBER_KEY];
        [unarchive finishDecoding];
        page = controller.page;
    }
}

//Write
- (void)saveDataWithObjectArchive {
    StickyNotesViewController *controller = [[StickyNotesViewController alloc] init];
    controller.page = self.page;
    NSMutableData *data = [[NSMutableData alloc] init];
    NSKeyedArchiver *archive = [[NSKeyedArchiver alloc] initForWritingWithMutableData:data];
    [archive encodeObject:controller forKey:NUMBER_KEY];
    [archive finishEncoding];
    [data writeToFile:[self dataFilePathWithName:ARCHIVE_FILE_PATH] atomically:YES];
}

#define SQLITE_DB_NAME @"my_data.db"

//Read
- (void)restoreDataWithSqlite {
    NSString *path = [self dataFilePathWithName:SQLITE_DB_NAME];
    sqlite3 *database;
    int result = sqlite3_open([path UTF8String], &database);
    if (SQLITE_OK != result) {
        sqlite3_close(database);
        NSAssert(0, @"Failed to open database");
    }
    
    char *errorMsg;
    char *createTable = "CREATE TABLE IF NOT EXISTS LX(ROW INTEGER PRIMARY KEY, DATA INTEGER);";
    int result2 = sqlite3_exec(database, createTable, NULL, NULL, &errorMsg);
    if (SQLITE_OK != result2) {
        sqlite3_close(database);
        NSAssert(0, @"Failed to create the table: %s", errorMsg);
    }
    char *query = "SELECT ROW, DATA FROM LX ORDER BY ROW";
    sqlite3_stmt *stmt;
    int result3 = sqlite3_prepare_v2(database, query , -1, &stmt, nil);
    if (SQLITE_OK == result3) {
        while (sqlite3_step(stmt) == SQLITE_ROW) {
            int row = sqlite3_column_int(stmt, 0);
            int data = sqlite3_column_int(stmt, 1);
            page = data;
            NSLog(@"row=%d ,data=%d",row, data);
        }
        sqlite3_finalize(stmt);
    }
    sqlite3_close(database);
}

//Write
- (void)saveDataWithSqlite {
    sqlite3 *database;
    int result = sqlite3_open([[self dataFilePathWithName:SQLITE_DB_NAME] UTF8String], &database);
    if (result != SQLITE_OK) {
        sqlite3_close(database);
        NSLog(@"Failed open the database");
        NSAssert(0, @"Failed to open the database");
    }
    char *update = "INSERT OR REPLACE INTO LX VALUES(?, ?);";
    sqlite3_stmt *stmt;
    int result2 = sqlite3_prepare_v2(database, update, -1, &stmt, nil);
    if (result2 == SQLITE_OK) {
        sqlite3_bind_int(stmt, 1, 1);
        sqlite3_bind_int(stmt, 2, page);
    } else {
        NSLog(@"Failed to prepare statement");
        NSAssert1(0, @"error msg: %s", sqlite3_errmsg(database));
    }
    int result3 = sqlite3_step(stmt);
    if (SQLITE_DONE != result3) {
        NSAssert1(0, @"Error updating table: %d", result3);
    }
    sqlite3_finalize(stmt);
    sqlite3_close(database);
}

//get file path by name
- (NSString *)dataFilePathWithName:fileName {
NSArray *path = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *docPath = [path objectAtIndex:0];
NSString *myFile = [docPath stringByAppendingPathComponent:fileName];
if ([[NSFileManager defaultManager] fileExistsAtPath:myFile]) {

} else {
//[[NSFileManager defaultManager] createFileAtPath:myFile contents:nil attributes:nil];
}
return myFile;
}