Question

我想知道当数据库（Coredata）字段发生变化时如何将应用程序重新上传到AppStore的详细信息。因为当我在数据库更改后重建应用程序时会出现崩溃，所以为了避免崩溃，我必须重新安装应用程序。

Answer 1

步骤1：检查数据库中的新字段第2步：使用alter query在数据库中添加该列

尝试以下代码并应用合适的逻辑。经过这个反馈我。很高兴为您提供帮助：）

+(void)alterCountryexitcodeTable{

    BOOL isAlterRequired = [self checkColumnExists];

    if (!isAlterRequired) {
        sqlite3 *database;
        sqlite3_stmt *statement;
        if(sqlite3_open([kDBPath UTF8String], &database) == SQLITE_OK)
        {
            NSString *updateSQL = [NSString stringWithFormat: @"ALTER TABLE countries ADD COLUMN countryexitcode TEXT"];
            const char *update_stmt = [updateSQL UTF8String];
            sqlite3_prepare_v2(database, update_stmt, -1, &statement, NULL);

            if(sqlite3_step(statement)==SQLITE_DONE)
            {
//                UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"DB altered" message:@"Success" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
//                [alert show];
//                alert=nil;
            }
            else
            {
//                UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"DB Updation" message:@"DB not Altered" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
//                [alert show];
//                alert=nil;
            }
            // Release the compiled statement from memory
            sqlite3_finalize(statement);    
            sqlite3_close(database);
        }
    }
}

+(BOOL)checkColumnExists
{
    BOOL columnExists = NO;

    static sqlite3 *database = nil;
    sqlite3_stmt *selectStmt = NULL;

    if (sqlite3_open([kDBPath UTF8String], &database) == SQLITE_OK) {

        DLog(@"BEGIN");

        sqlite3_exec(database, "BEGIN", 0, 0, 0);

        NSString *sqlStatement = @"select countryexitcode from countries";
        if(sqlite3_prepare_v2(database, [sqlStatement UTF8String], -1, &selectStmt, NULL) == SQLITE_OK)
            columnExists = YES;
    }
    return columnExists;
}

Answer 2

最好的方法是使用核心数据迁移。

参考：https://developer.apple.com/library/ios/documentation/Cocoa/Conceptual/CoreDataVersioning/Articles/vmLightweightMigration.html

教程：https://www.raywenderlich.com/27657/how-to-perform-a-lightweight-core-data-migration

更改DataBase（Coredata）时将应用程序上传到AppStore（iOS）

2 个答案: