New to EF... using 6.0. I've have a Stored Proc which has the dynamic build select query inside a string variable that outputs using Execute(#StringQuery). This select has around 20 columns.
After adding this SP in EF, the return type is INT (not sure why). But I think I've to add all the columns manually in Complex types in EDMX. Wanted to know whether there is any better way to handle this as the columns are in huge number.
Please suggest.
Procedure Text:
DECLARE #StringQuery VARCHAR(MAX)
SET #StringQuery = 'SELECT AROUND 20 COLUMNS WITH LOT OF CONDITIONS ADDED'
EXECUTE(#StringQuery)
Open your model
Go to View->Other Windows->Entity Data Model Browser
In browser expand your Model->Function Imports and double click on Stored Proc
In Returns a Collections off choose Complex and press Get Column Information
Click Create New Complex Type
OK, Save
Related
Forum Newbie...
I want to utilise the ADF Copy function, to carry out incremental table extracts from one Azure DB to another. Every table in the database that I need all have the same 2 relevant fields i.e. date1, date2. For Watermark comparison purposes, I need to use isnull(date1,date2), but unsure how to do this, i.e. I am not sure how I can add this consistent derived value to the Source as an additional field that can perhaps be added via the Query or Stored Procedure Option on the source, to utilise the #item().source.schema and #item().source.table values that have already been generated as parameters..?
You can use the query option in the Copy data activity source and add a new column in the query itself to get the results of isnull(date1,date2) and include the parameter values to get the table name instead of hardcoding them as shown below.
In source, select Query option under Use query and add dynamic content to concat() select statement with parameter values.
#concat('select *, isnull(date1,date2) as final_dt from ',pipeline().parameters.schema,'.',pipeline().parameters.table)
Sink table data output:
I am pretty new to Pentaho so my query might sound very novice.
I have written a transformation in which am using CSV file input step and table input step.
Steps I followed:
Initially, I created a parameter in transformation properties. The
parameter birthdate doesn't have any default value set.
I have used this parameter in postgresql query in table input step
in the following manner:
select * from person where EXTRACT(YEAR FROM birthdate) > ${birthdate};
I am reading the CSV file using CSV file input step. How do I assign the birthdate value which is present in my CSV file to the parameter which I created in the transformation?
(OR)
Could you guide me the process of assigning the CSV field value directly to the SQL query used in the table input step without the use of a parameter?
TLDR;
I recommend using a "database join" step like in my third suggestion below.
See the last image for reference
First idea - Using Table Input as originally asked
Well, you don't need any parameter for that, unless you are going to provide the value for that parameter when asking the transformation to run. If you need to read data from a CSV you can do that with this approach.
First, read your CSV and make sure your rows are ok.
After that, use a select values to keep only the columns to be used as parameters.
In the table input, use a placeholder (?) to determine where to place the data and ask it to run for each row that it receives from the source step.
Just keep in ming that the order of columns received by the table input (the columns out of the select values) is the same order that it will be used for the placeholders (?). This should not be a problem with your question that uses only one placeholder, but keep that in mind as you ramp up using Pentaho.
Second idea, using a Database Lookup
This is another approach where you can't personalize the query made to the database and may experience a better performance because you can set a "Enable cache" flag and if you don't need to use a function on your where clause this is really recommended.
Third idea, using a Database Join
That is my recommended approach if you need a function on your where clause. It looks a lot like the Table Input approach but you can skip the select values step and select what columns to use, repeat the same column a bunch of times and enable a "outer join" flag that returns the rows without result from the query
ProTip: If you feel the transformation running too slow, try to use multiple copies from the step (documentation here) and obviously make sure the table have the appropriate indexes in place.
Yes there's a way of assigning directly without the use of parameter. Do as follows.
Use Block this step until steps finish to halt the table input step till csv input step completes.
Following is how you configure each step.
Note:
Postgres query should be select * from person where EXTRACT(YEAR
FROM birthdate) > ?::integer
Check Execute for each row and Replace variables in in Table input step.
Select only the birthday column in CSV input step.
I thought this would be an easy task, but since I am new to PDI, I could not
find out so far which transform to choose to accomplish the following:
I am using Pentaho Data Integration (former Kettle), Community Edition, to map/copy values from one table ('tasksA') of one database 'A' to another table
'tasksB' in another database B. tasksA has a column 'description' and I want
to copy these values to the column 'taskName' in 'tasksB'.
Furthermore, I have to copy each value of 'description' several times, since
in 'tasksB', there are multiple lines for each value in 'taskName'.
Maybe this would be possible by direct SQL, but I wanted to try whether
I can define this more readable with PDI, especially because in the next step I will have to extend it to other tables involved.
So I have to tell which value of
'description' has to be mapped onto which value of 'taskName' and that in
every tuple containing this value (well, sounds like a WHERE clause...) in the column 'taskName' it should be replaced.
My first experiments with the 'Table input' and 'Table output' steps
did not work when I simply drew a hop between them and modifying the 'database
fields' tab of the 'Table output' step, which generated 'drop column' statements
in the resulting SQL which is not what I want. I don't want to modify the schema, just copy the values.
Would be great if someone could point me to the right steps/transforms needed,
I worked through the first examples from the Pentaho Wiki and have got the 'Pentaho Kettle Solutions' book of Casters et al. but could find out how
to do solve this. Many thanks in advance for any help.
If I got this right, you should use the Table Input connected to a "Insert/Update" step.
On the Insert/Update step you need to inform the keys from tasksA where should be looked up on tasksB. Then define which fields on tasksB should be updated: description (as stream field) -> taskName (as the table field).
Keep in mind that if this key is not found, a row will be inserted on tasksB. If it is not what you plan, you'll need to build something like: Table Input -> Database Lookup -> Filter Rows -> Insert/Update
#RFVoltolini has a good answer. Alternatively you could go
Table Input -> Update
And connect the error output to something else like a Text file output.
I have to create some sub complex types from the stored procedure's returning columns.
I mean some columns are result of some operation (like addition or subtraction) which I want to compute them i application (because it makes large sub queries if I make them in stored procedure).
thank you.
Create stored procedure returning columns you want to get from the database.
Import the stored procedure in Update from database wizard
Go to model browser and create function import for that stored procedure
Select complex type as return value (it can create complex type for you)
Create your partial part of class generated for the complex type and create all properties you want to compute in your application
Steps 1-4: How to import stored procedure
Btw. this is possible only with EFv4.x with EDMX.
Is it possible to use the name of a table as a parameter in t-sql?
I want to insert data into a table, but I want one method in C# which has a parameter for the table.
Is this a good approach? I think if I have one form and I am choosing the table and fields to insert data into, I am essentially looking to write my own dynamic sql query built on the fly. This is another thing altogether which I am sure has its catches?
Thanks
Not directly. The only way to do this is through dynamic SQL - either EXEC or sp_ExecuteSQL. The latter has the advantage of query cache/re-use, and avoiding injection via parameters for the values - but you will have to concatenate the table-name itself into the query (you can't parameterise it), so be sure to white-list it against a list of known-good table names.