I have a SQL Database which I imported as a ADO.NET Entity Data Model. I then proceeded to rename some tables and field names in the model. I quite foolishly deleted the wrong field in my model. It still shows in the SQL table, but not in my model. How can I get it back with out deleting my model and starting over?
Just run the "Update Model From Database" wizard.
Right click on an empty area in your EDMX.
Related
I think my database is corrupted. Every time I open the database or any object (table, forms, reports) in the database, I get an error message that says
"'Id' is not an index in this table".
I created a new DB and tried to export the objects in the DB. I was only able to export the tables, not the forms or report. Help please
My other attempts to fix the problem both failed:
compact & repair
Turned off the Name AutoCorrect check boxes
Say I have the one db schema named "action" that has the tables "actions" and "actionnotifications". Then I have another db schema named "notification" that has the table "notifications".
I am using ActiveJDBC to query the complex action object.
The Action class (which extends Model) has the following annotation:
#Many2Many(other = Notification.class, join = "actionnotifications", sourceFKName = "actionId", targetFKName = "notificationId")
When I run the following code:
List actions= Action.where("id = ?", actionId).include(Notification.class)
I get a MySQLSyntaxError exception saying that "Table 'action.notifications' doesn't exist". I have not seen anything in the ActiveJDBC documentation that talks about querying class relationships over different db schemas, does anyone have any experience accomplishing this task?
This is more of an issue of MySQL and not ActiveJDBC. Are you sure you can access tables from one schema while connected to another? The schema is really part of the MySQL JDBC URL, correct? If you can write a Java program that can access all your tables from different MySQL databases, that ActiveJDBC will be able to do that too.
I'm new to Talend. I want to make a script that transform my data (using an sql query) from a database and insert them to an other one.
Could you help me please with the list of components that I should use ? any tutorial ?
Thank you
Talend has many database specific components. You will find input and output components for all databases. input components are those which enables you to read data from database and bring it to talend and output components are those which allows you to write/insert data to database.
for example if your source and target are both oracle then -
toracleinput will be for reading from oracle db - (you have to mention connection details, sql query and schema for this component).
toracleoutput will be for inserting this data back to oracle database table. Here again you have to mention connection details, target table name, type of operation etc..
finally you have to connect flow of data from input to output component and if you need any intermediate transformations, joins etc you have to user other talend components in between like tMap etc..
I know EF checks the EdmMetadata table to determine if the version of model classes is same as database tables.
I want to know exactly how EF can find if the version of a model has changed. In other words, I want to know what does EF compare to the modelhash in the database?
Have a look at this blog post about the EdmMetadata table.
For your question, this is the relevant parts:
The EdmMetadata table is a simple way for Code First to tell if the
model used to create a database is the same model that is now being
used to access the database. As of EF 4.1 the only thing stored in the
table is a single row containing a hash of the SSDL part of the model
used to create the database.
(Geek details: when you look in an EDMX file, the SSDL is the part of
that file that represents the database (store) schema. This means that
the EdmMetadata model hash only changes if the database schema that
would be generated changes; changes to the conceptual model (CSDL) or
the mapping between the conceptual model and the database (MSL) will
not affect the hash.)
I am creating a visual representation of my existing database with MySQL Workbench and I am able to synchronize the models with the "Database -> Synchronize Model..." menu. However, every time I synchronize (update) my model, I have to recreate the EER Diagram and rearrange all the tables. Is there a way to update or synchronize the EER Diagram as well? Thanks.
Database > Synchronize Model...
Choose Stored Connection
Select the Schemata
Choose which to update: Model or Source (in your case, point arrows to Model)
Are you by any chance using a MySQL DB engine that doesn't support foreign keys (e.g. MyISAM?)? Hence, the relations between the tables is not saved on the MySQL server and get lost during synchronization to the workbench.
But I realize this is only the 'why' of your question. I cannot provide an answer that would preserve your arrangement without using an engine that supports foreign keys, e.g. InnoDB.
I was having a variant of this problem--somehow when I would update the model from the database, one of my tables and its corresponding updatable view wouldn't update.
I believe what was happening is that the model was actually updating, but not the diagram. I didn't really make the distinction at first.
Anyway here's how to get the refresh on the E/R diagram:
Delete the nonupdating object(s) from the diagram. (Just right click and choose "Delete".)
Find the objects in the catalog view in the left sidebar.
Drag them back onto the diagram.
Now they should reflect the model (which should reflect the DB if you followed the accepted answer above.)
When I have more than 3 tables to sync, with changes on relations, I changes arrow direction (model <- source), I check "Skip DB changes and update model only" and Execute...
The "Progress of Model and Database Synchronization" window hang with "Apply changes to Model" highlighted. No processor working, nothing move...
I click the X of the window and redo the process again. Clicking the DB, ignore (all), and selecting less tables to update.
v.5.2.44 ce rev 9933
EDIT: Version 5.2.47 correct this bug !!! Yé !