1 Star 0 Fork 2

心静自然凉6678 / YTBaseDBManager

forked from Aron / YTBaseDBManager 
Create your Gitee Account
Explore and code with more than 8 million developers,Free private repositories !:)
Sign up
This repository doesn't specify license. Please pay attention to the specific project description and its upstream code dependency when using it.
Clone or Download
Cancel
Notice: Creating folder will generate an empty file .keep, because not support in Git
Loading...
README.md

YTBaseDBManager

IOS数据库升级数据数据迁移的解决方案

原理分析

IOS 数据库升级数据迁移解决方案

安装

使用 Pod 导入,因为是开发库,所以需要指定 :path 参数

pod 'YTBaseDBManager', :path => '../'

使用

客户端使用的DEMO代码如下

  1. 客户端使用方法 [self setDBFilePath:DBPath newDBVersion:DB_Version]; 设置数据库路径
  2. 客户端重写模板方法 initTables 执行创建表的逻辑
  3. 底层库会自动分析新表和旧表,自动进行数据迁移的操作
/** 数据库保存的缓存目录 */
static NSString* kDBCache = @"DBCache";
/** 数据库文件名称 */
static NSString* DB_NAME = @"YTDB.sqlite";
/** 当前使用的数据库版本,程序会根据版本号的改变升级数据库以及迁移旧的数据 */
static NSString* DB_Version = @"1.0.1";

@implementation YTBusinessDBManager

// 子类的单例
+ (instancetype)sharedInstance{
    static id instance;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        instance = [[self alloc] init];
    });
    return instance;
}

- (instancetype)init {
    self = [super init];
    if (self) {
        // 创建数据库文件
        NSString* cachePath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) objectAtIndex:0];
        NSString *DBDir = [cachePath stringByAppendingPathComponent:kDBCache];
        BOOL isDir = NO;
        if (!([[NSFileManager defaultManager] fileExistsAtPath:DBDir isDirectory:&isDir] && isDir)) {
            [[NSFileManager defaultManager] createDirectoryAtPath:DBDir withIntermediateDirectories :YES attributes :nil error :nil];
        }
        NSString* DBPath = [DBDir stringByAppendingPathComponent:DB_NAME];
        
        // 设置数据库路径,包含了数据库升级的逻辑
        __weak __typeof(self)weakSelf = self;
        [[YTBaseDBManager sharedInstance] startUpgradeDBWithPath:DBPath newDBVersion:DB_Version createTableBlock:^{
            __strong __typeof(weakSelf)strongSelf = weakSelf;
            [strongSelf initTables];
        }];
    }
    return self;
}

// 初始化数据表
- (void)initTables {
    // TODO: 在这里做初始化表的操作
    [VideoUploadModel createTableIfNotExists];
}

@end

Repository Comments ( 0 )

Sign in to post a comment

About

IOS数据库升级数据数据迁移的解决方案 expand collapse
Objective-C
Cancel

Releases

No release

Contributors

All

Activities

Load More
can not load any more
Objective-C
1
https://git.oschina.net/xieqi520/YTBaseDBManager.git
git@git.oschina.net:xieqi520/YTBaseDBManager.git
xieqi520
YTBaseDBManager
YTBaseDBManager
master

Search