Question

我正在尝试在我的iOS应用程序中使用Sqlite3创建数据库。如果我在文档目录的子文件夹中创建数据库，它不是创建数据库，它无法打开或创建数据库。如果我不在子文件夹中创建数据库，而是直接在文档目录中创建它。它正在创造它。

它将路径作为databasePath：＆＃34; / var / mobile / Containers / Data / Application / 986037DB-6FA0-4066-9977-C5D7A075C5E7 / Do cuments / MailFolder / INBOX.db＆＃34; 但它失败了 - ＆gt; if (sqlite3_open(dbpath, &database) == SQLITE_OK) - 下面是我在子文件夹中创建DB的代码。有人可以纠正我这里有什么问题吗？

- (BOOL) createFolderMailDB :(NSString *) dbName {
    NSString *docsDir;
    NSArray *dirPaths;

    // Get the documents directory
    dirPaths = NSSearchPathForDirectoriesInDomains (NSDocumentDirectory, NSUserDomainMask, YES);
    //docsDir =[[dirPaths objectAtIndex:0] stringByAppendingPathComponent:@"MailFolder"];
    NSString *documentsPath = [dirPaths objectAtIndex:0];
    docsDir = [documentsPath stringByAppendingPathComponent:@"/MailFolder"];

    //docsDir = dirPaths[0];
    // Build the path to the database file
    NSMutableString *finalDBPath = [[NSMutableString alloc]init];
    [finalDBPath appendString:dbName];
    [finalDBPath appendString:@".db"];
    databasePath = [[NSString alloc] initWithString: [docsDir stringByAppendingPathComponent: finalDBPath]];

    NSLog(@"databasePath: %@", databasePath);

    BOOL isSuccess = YES;

    NSFileManager *filemgr = [NSFileManager defaultManager];
    if ([filemgr fileExistsAtPath: databasePath] == NO)
    {
        const char *dbpath = [databasePath UTF8String];
        if (sqlite3_open(dbpath, &database) == SQLITE_OK)
        {
            char *errMsg;
            const char *sql_stmt = "create table if not exists MailFolderDBTable (emailid text, foldername text, messagedata text)";
            if (sqlite3_exec(database, sql_stmt, NULL, NULL, &errMsg)
                != SQLITE_OK)
            {
                isSuccess = NO;
                NSLog(@"Failed to create table");
            }
            sqlite3_close(database);
            return  isSuccess;
        }
        else {
            isSuccess = NO;
            NSLog(@"Failed to open/create database");
        }
    }

    return isSuccess;
}

Answer 1

您放置此数据库的文件夹必须存在，否则尝试创建数据库将失败。因此，在继续创建数据库之前创建该文件夹：

windows()

无法在文档目录

1 个答案: