data-migration

问题 I have 2 databases, one is MS Access DB from an old website, and the other one is MYSQL from the new Joomla+VirtueMart based website. I need to migrate existing products from MS Access to MYSQL. I thought of putting both on server and writing SQL queries in MYSQL workbench, untill I have a good script for that, but I'm very new to SQL, so I'd rather avoid that. I there a better way and more efficient for that? 回答1: You can always export to CSV and import that in MySQL. 回答2: you can use tools

问题 After I reached the limits of Ionic I boldly decided to detach from the web world and learn Kotlin to rewrite the app in the native language. After an amusing challenge I have my new app up and running. But I forgot about one of the most important details : Data Migration . The Ionic version stores data localy in an SQLite database: I am using this Ionic Native Plugin Cordova-sqlite-storage and I nearly do the same thing as this guy over here the only major diffrence I am on Capacitor. In the

来源： https://stackoverflow.com/questions/64496424/unable-to-update-the-createdat-property-in-mongoose

来源： https://stackoverflow.com/questions/64496424/unable-to-update-the-createdat-property-in-mongoose

来源： https://stackoverflow.com/questions/64496424/unable-to-update-the-createdat-property-in-mongoose

来源： https://stackoverflow.com/questions/64496424/unable-to-update-the-createdat-property-in-mongoose

问题 I converted a csv file to a realm file and I want to use it in my app. This is my code atm: func inLibrarayFolder(fileName: String) -> URL { return URL(fileURLWithPath: NSSearchPathForDirectoriesInDomains(.libraryDirectory, .userDomainMask, true)[0], isDirectory: true) .appendingPathComponent(fileName) } func copyPreBundleDataCompeletely() { let mainRealmUrl = inLibrarayFolder(fileName: "main.realm") let bundleUrl = Bundle.main.url(forResource: "treesFull", withExtension: "realm")! //After

问题 We have Cassandra cluster with single token per node, total 22 nodes, average load per node is 500Gb. It has SimpleStrategy for the main keyspace and SimpleSnitch. We need to migrate all data to the new datacenter and shutdown the old one without a downtime. New cluster has 28 nodes. I want to have vnodes on it. I'm thinking of the following process: Migrate the old cluster to vnodes Setup the new cluster with vnodes Add nodes from the new cluster to the old one and wait until it balances

问题 I have a pretty long data migration that I'm doing to correct an earlier bad migration where some rows were created incorrectly. I'm trying to assign values to a new column based upon old ones, however, sometimes this leads to integrity errors. When this happens, I want to throw away the one that's causing the integrity error Here is a code snippet: def load_data(apps, schema_editor): MyClass = apps.get_model('my_app', 'MyClass') new_col_mapping = {old_val1: new_val1, ....} for inst in

问题 This is my workflow, everything seems nice and tidy with makemigrations and migrate . However, I want to start over with my models, so I: rm -rf all the migrations file in the django app directory; drop all the related tables in the database; makemigrations results in new migration files; But when I want to migrate it into database, it is said No migrations to apply . I think the mechanism behind migrations is that models -> migrations -> database changes, if I drop the latter two it should