sqlite ios:尝试编写只读数据库

Question

我为项目使用sqlite数据库.我可以做SELECT之类的查询,但不可能做INSERT!在模拟器上,INSERT正常工作.只要我在iPod上编译,就会出现以下错误消息:"尝试编写只读数据库".

认为这是我做的文件的权利:chmod 777 mydatabase.sqlite 但是这不会改变!

我也尝试过,因为我已经在其他网站上阅读并复制该文件以使用他的副本来完成它,但无济于事.

你有解决方案吗？热忱.

PS:这是我的代码:

for(NSDictionary *q in quotes) {
    sqlite3_stmt    *statement;
    sqlite3 *contactDB;
    const char *dbpath = [dbPath UTF8String];

    if (sqlite3_open_v2(dbpath, &contactDB, SQLITE_OPEN_READWRITE, NULL) == SQLITE_OK)
    {
        NSInteger identifiant = [[q objectForKey:@"id"] integerValue];
        NSString *texte = [q objectForKey:@"texte_english"];
        NSString *auteur = [q objectForKey:@"auteur"];
        NSString *date = [q objectForKey:@"date"];
        NSInteger auteurId = [[q objectForKey:@"auteur_id"] integerValue];
        NSInteger nbComments = [[q objectForKey:@"nb_comments"] integerValue];

        NSString *insertSQL = 
                [NSString stringWithFormat:@"INSERT INTO quotes (id, texte_english, auteur, date, auteur_id, nb_comments) VALUES (%d, \"%@\", \"%@\", \"%@\", \"%d\", \"%d\")", 
                                          identifiant, 
                                          texte, 
                                          auteur, 
                                          date, 
                                          auteurId, 
                                          nbComments];

        const char *insert_stmt = [insertSQL UTF8String];
        sqlite3_prepare_v2(contactDB, insert_stmt, -1, &statement, NULL);

        if (sqlite3_step(statement) != SQLITE_DONE)
        {
            NSLog(@"ERREUR1: %s",sqlite3_errmsg(contactDB));
        }
        sqlite3_finalize(statement);
        sqlite3_close(contactDB);
    }
}

Answer 1

您需要做的就是更改您在手机中保存SQLite文件的根目录.进行这些更改:

将这些代码添加到您的AppDelegate:

.h文件:

@property (nonatomic,retain) NSFileManager *fileMgr;
@property (nonatomic,retain) NSString *homeDir;
@property (nonatomic,retain) NSString *title;

.m文件:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    [self checkAndCreateDatabase];
    return YES;
}

-(NSString *)GetDocumentDirectory{
    fileMgr = [NSFileManager defaultManager];
    homeDir = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];
    return homeDir;
}

    -(void) checkAndCreateDatabase{
    BOOL success;
    NSFileManager *fileManager = [NSFileManager defaultManager];
    NSString *databasePath = [self.GetDocumentDirectory stringByAppendingPathComponent:@"YOUR DATABASE NAME.sqlite"];
    success = [fileManager fileExistsAtPath:databasePath];
    if(success) {
        NSLog(@"working");
        return;}
    else{
        NSLog(@"notworking");
    NSString *databasePathFromApp = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"YOUR DATABASE NAME.sqlite"];
    [fileManager copyItemAtPath:databasePathFromApp toPath:databasePath error:nil];
    }
}

同样在你SQLite class添加这些行:

.h文件:

@property (nonatomic,retain) NSFileManager *fileMgr;
@property (nonatomic,retain) NSString *homeDir;

.m文件:

-(NSString *)GetDocumentDirectory{
    fileMgr = [NSFileManager defaultManager];
    homeDir = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];
    return homeDir;
}

并且在INSERT和SELECT中进行以下更改:

NSString *dbPath = [self.GetDocumentDirectory stringByAppendingPathComponent:@"YOUR DATABASE NAME.sqlite"];
    const char *dbpath = [dbPath UTF8String];

希望能帮助到你 :)