iPhone - 试图将 sqlite 数据库复制到文档目录 - 复制空白版本

Question

我有一个名为“ProductDatabase.sql”的 sqlite 数据库，我已将其复制到我的应用程序项目目录中：

/Users/jacknutkins/Documents/TabbedDietApp/TabbedDietApp/ProductDatabase.sql

在应用程序委托类中，我有这段代码：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    //Set-up some globals
    m_DatabaseName = @"ProductDatabase.sql";

    //Get the path to the documents directory and append the databaseName
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    m_DatabasePath = [documentsDirectory stringByAppendingPathComponent:@"ProductDatabase.sql"];

    //Execute the "checkAndCreateDatabase" function
    [self checkAndCreateDatabase];

    //Query the databse for all animal records and construct the "animals" array
    [self readProductsFromDatabase];

....

此时：

m_DatabasePath = '/Users/jacknutkins/Library/Application Support/iPhone Simulator/5.0/Applications/6D5BBE3A-BC9A-4C44-B089-FABA27CFFF4B/Library/ProductDatabase.sql'

以下是其他 2 种方法的代码：

- (void) checkAndCreateDatabase {
    NSError * error;

    //Check if the database has been saved to the users phone, if not then copy it over
    BOOL l_Success;

    //Create a file manager object, we will use this to check the status
    //of the databse and to copy it over if required
    NSFileManager *l_FileManager = [NSFileManager defaultManager];

    //Check if the database has already been created in the users filesystem
    l_Success = [l_FileManager fileExistsAtPath:m_DatabasePath];

    //If the database already exists then return without doing anything

    if(l_Success)
        return;

    //If not then proceed to copy the database from the application to the users filesystem

    //Get the path to the database in the application package
    NSString *l_DatabasePathFromApp = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:m_DatabaseName];

    //Copy the database from the package to the usrrs filesystem
    [l_FileManager copyItemAtPath:l_DatabasePathFromApp toPath:m_DatabasePath error:&error];

}

如果我在这里执行一些 NSLog：

l_DatabasePathFromApp = /Users/jacknutkins/Library/Application Support/iPhone Simulator/5.0/Applications/6D5BBE3A-BC9A-4C44-B089-FABA27CFFF4B/TabbedDietApp.app/ProductDatabase.sql

和：

错误 = Error Domain=NSCocoaErrorDomain Code=260 "无法完成操作。（Cocoa 错误 260。）" UserInfo=0x6b6d060 {NSFilePath=/Users/jacknutkins/Library/Application Support /iPhone Simulator/5.0/Applications/6D5BBE3A-BC9A-4C44-B089-FABA27CFFF4B/TabbedDietApp.app/ProductDatabase.sql, NSUnderlyingError=0x6b6cfa0 "操作无法完成。没有这样的文件或目录"}

我不确定它在这里找不到什么文件..

- (void) readProductsFromDatabase {
    //Init the products array
    m_Products = [[NSMutableArray alloc] init];
    NSLog(@"%@", m_DatabasePath);
    //Open the database from the users filessystem
    if(sqlite3_open([m_DatabasePath UTF8String], &database) == SQLITE_OK) {
        //Set-up the SQL statement and compile it for faster access
        const char *sqlStatement = "select * from products";
        sqlite3_stmt *compiledStatement;

        if(sqlite3_prepare_v2(database, sqlStatement, -1, &compiledStatement, NULL) == SQLITE_OK)
        {
            NSLog(@"Success..");
            //Loop through the results and add them to the feeds array
            while(sqlite3_step(compiledStatement) == SQLITE_ROW) {
                //Read the data from the results row
                NSString *aName = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 1)];
                NSString *aCategory = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 2)];
                NSString *aCalories = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 3)];
                NSString *aFat = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 4)];
                NSString *aSaturates = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 5)];
                NSString *aSugar = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 6)];
                NSString *aFibre = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 7)];
                NSString *aSalt = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 8)];
                NSString *aImageURL = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 9)];
                NSLog(@"Delegate");
                NSString *aNote = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 10)];
                NSUInteger myInt = sqlite3_column_int(compiledStatement, 11);
                NSString *aServes = [NSString stringWithFormat:@"%d", myInt];

                //Create a new animal object with the data from the database
                Product *l_Product = [[Product alloc] initWithName:aName category:aCategory calories:aCalories fat:aFat saturates:aSaturates sugar:aSugar fibre:aFibre salt:aSalt imageURL:aImageURL note:aNote serves:aServes];

                //Add the animal object to the animals array
                [m_Products addObject:l_Product];

            }
        }
        //Release the compiled statement from memory
        sqlite3_finalize(compiledStatement);

    }
    sqlite3_close(database);

}

数据库在.h文件中声明如下：

//Setup the database object
    sqlite3 *database;

在上述方法中，行：

if(sqlite3_prepare_v2(database, sqlStatement, -1, &compiledStatement, NULL) == SQLITE_OK)

不会评估为 SQLITE_OK，因为我尝试复制到文档目录的数据库是空白的。

我已经尝试清理和构建，删除数据库的空白副本并重新运行等，但它每次都会继续复制空白数据库。

我已经用谷歌搜索了好几次，我已经尝试了所有我能找到的东西，但没有成功..

任何帮助将不胜感激。

杰克

编辑

如果我从项目目录中数据库的终端窗口中执行“select * from products”，我会返回预期的结果。

Answer 1

我忘记通过单击文件检查器选项卡中的复选框将数据库文件包含在目标成员中。