I was creating MySQL database to add medicine.I created a table and I need to add one more tabe.After creating it I tried to query the database from the sql workbench.But it donot show the table but it is present in the EER Model.How can I solve this problem.
Modeling is just the task of abstractly designing your schema and its objects (e.g. tables, views etc.). It does not actually create these objects. For this you have to forward engineer your model to a server (see Database menu). Once done you can use the Synchronization feature to update either model or server (or both) with any changes made.
But keep in mind this is only for the objects, not for any data.
Related
I created an entity-relationship diagram (logical model) and engineered it to a relational model.
The tables were generated. Now I need to use them from the connection XE as you see in the picture.
The tables I made can only be seen on the data modeler design view in the "Browser", how do I get them on the connection "XE" to generate data dictionary, etc?
There are three possibilities:
you just need to expand the tables item in the tree to see your tables
You are looking in the wrong schema/user - go down to Other Users, and find the schema those tables belong to
The tables do not exist in the current database
If #3 is the issue, you would need to create them, possibly using the information in your Data Model - that is, you can generate the DDL/SQL scripts for those tables.
Then taking those scripts, run them while connected to the appropriate database/schema.
Disclaimer: I'm an Oracle employee and the product manager for these tools.
I am rebuilding a system so instead of using multiple Access and Excel files the business I am working for, uses SSRS for reporting requirements. Most things are coming along great but I have one sticking point.
One of the Access databases has a table within itself rather than replying on the server data, which is there to keep the grade level of staff up to date (as it is a very complex method on how staff go up a grade).
Now I could easily build a new table in the SQL Server, but I do not want management relying on me for updating this particular table. I could also rebuild the Access database to upload the data to the server which is probably what I will do, but what I wanted to ask first is there a way to join to the table in the Access Database from the T-SQL query, as if it was another table in the main database?
Yes. Attach the database file under Server Objects as a Linked Server.
To ease referencing the table in this, create a view in your database that "hides" the needed weird triple-dot syntax, like:
SELECT FIELD1, FIELD2, FIELDN
FROM THELINKEDSERVERNAME...YourTable AS LinkedYourTable
Then use this view to read the table.
I have a simple test setup:
A SQL Server (2017) with one database, with one table
A SQL Server Analysis Server (2017, with compatibility level 1400)
I have created a simple tabular model in Visual Studio with one datasource (the database with one table) and one table
This is my power query:
let
Source = #"SQL/MYCOMPUTER\SQLDEV;SampleDatabase",
dbo_testTable = Source{[Schema="dbo",Item="testTable"]}[Data]
in
dbo_testTable
I have deployed this tabular model to my SSAS instance...
Now my question: if the table in my SQL Server is updated (added records), how can I see these updates reflected in the Tabular Model? Do I have to rerun the Tabular Model somehow?
I have tried "Process Table" in SSMS on the Tabular model table, but it does not get the new records...
Processing a table processes whichever dimension or fact table you selected and this will only read data from the database objects used by this table. What processing is actually performed will depend on the type of processing that you used. As far as the question in the answer you posted, Process Full on an entire Tabular model will remove all data from the deployed model, then reload everything and process the hierarchies and measures as well, so yes the new data from the underlying tables will now be in the model for all tables within it after you processed it using this option. There are multiple processing types that can either be done at the database, table, or partition level. You can view additional details on these via the Microsoft reference.
I have found that on the level of the Database in the SSAS instance, there is an option "Process Database" that has an option "Process Full", which does update all the underlying tables.
But maybe there is a better way to do this?
I am new to the PostgreSQL database. What my visual c++ application needs to do is to create multiple tables and add/retrieve data from them.
Each session of my application should create a new and distinct database. I can use the current date and time for a unique database name.
There should also be an option to delete all the databases.
I have worked out how to connect to a database, create tables, and add data to tables. I am not sure how to make a new database for each run or how to retrieve number and name of databases if user want to clear all databases.
Please help.
See the libpq examples in the documentation. The example program shows you how to list databases, and in general how to execute commands against the database. The example code there is trivial to adapt to creating and dropping databases.
Creating a database is a simple CREATE DATABASE SQL statement, same as any other libpq operation. You must connect to a temporary database (usually template1) to issue the CREATE DATABASE, then disconnect and make a new connection to the database you just created.
Rather than creating new databases, consider creating new schema instead. Much less hassle, since all you need to do is change the search_path or prefix your table references, you don't have to disconnect and reconnect to change schemas. See the documentation on schemas.
I question the wisdom of your design, though. It is rarely a good idea for applications to be creating and dropping databases (or tables, except temporary tables) as a normal part of their operation. Maybe if you elaborated on why you want to do this, we can come up with solutions that may be easier and/or perform better than your current approach.
I am using Self Tracking Entities with the Entity Framework 4. I have 2 databases, with the exact same schema. However, tables in one database will be added to/edited etc (and I mean data will be added/edited, not the actual table definitions) and at certain points of the day I will need to synchronize all the changes between this database and the other database.
I can create a separate context for both of them. But if I read a large graph from one database, how can I update the other database with the graph? Is there an easy way?
My database model is large and complex and fully relational. So it would be a big job to go through every single entity and do a read from the other database to see if it exists or not, update/insert it if need be, and then carry this on through the full object graph!
Any ideas?
This is not a use case for EF. In EF you will have to do exactly what you've described. Self tracking entities are able to track changes to these object instances - they know nothing about changes made to their own database over time and they will not know anything about state of your second database as well.
Try to look at SQL server native features (including mirroring, transaction log shipping or SSIS) and MS Sync framework. Depending on your detailed requirements these tools can suite you better.