i need to archive below query in informatica mapping with joiner
select student.roll_number,lecture.roll_number,name,DOB
from College
join student student on student.id = college.student_id
join student lecture on lecture.id = college.lecture_id;
Nothing to stop you adding same source as an alias and then defining the join on the source qualifier. Just need to manually link up the second aliased source
Both tables are on same DB, then in SQ you can use same above query and only you need to add all query fields on Source definition and SQ. Make sure you have added all fields and data type for fields are correct. No need of joiner transformation.
Related
I am trying to delete a set of data in the target table based on a column (year) from the lookup in IICS (Informatica Cloud).
I want to solve this problem using pre/post sql commands but the constraint is I can't pass year column to my query.
I tried this:
delete from sample_db.tbl_emp where emp_year = {year}
I want to delete all the employees in a specific year i get from lookup return
For Ex:
I got year as '2019', all the records in table sample_db.tbl_emp containing emp_year=2019 must be deleted.
I am not sure how this works in informatica cloud.
Any leads would be helpful.
How are you getting the year value? A pre/post SQL may not be the way to go unless you need to do this as part of another transformation, i.e., before or after the transformation runs. Also, does your org only have ICDI, or also ICAI? ICAI may be a better solution depending on the value is being provided.
The following steps would help you achieve this.
Create an input-output parameter in your mapping.
Assign the result of your lookup in an expression transformation to the parameter using SetMaxVariable
Use the parameter in your target pre SQL as
delete from sample_db.tbl_emp where emp_year = $$parameter
Let me know if you have any further questions
I need to support legacy client and compose ADO datasets from our Linq queries. The problem is how get specific column information (varchar length, decimal precision, etc) that cannot be obtained using reflection.
for example, I have table Customer with field Name varchar(80)
When I fetch data from linq to entities query:
var data = (from c in ctx.Customers select c.Name).ToList()
I cannot obtain maxSize for the column data[i].Name and adodataset raises an error.
I already have simple solution:
Code to extract column metadata from ObjectContext by property reference
Simple code that parses expression from Queryable and links output properties to edm columns.
But I have a lot of issues parsing complex queries that include multiple nested groupbys/unions/joins etc.
Does anybody know any other way (maybe using materialization shaper or similar)?
Thanks to EFProviderWrappers by Joseph Kowalski I have made similar provider and published it on codeplex
I'm trying to get the following done: Using Altova Mapforce, I use an XML file with schema as a source. I want to map it to exactly the same output, but only add data to one field.
The value of the field (it's Tax) is determined using a two table SQL join with a WHERE clause over both tables. The tables are joined using foreign keys, the relation is recognized by Mapforce.
The first field of the WHERE clause comes from the first table (header type table), the second and third field from the second tables (lines type tables).
However, I cannot seem to create the logical and correct equivalent of what I am describing here. I've tried it using complex AND constructions where it then inserts the one field I would need multiple times. I've tried WHERE clauses but they fail as they never supply both tables at the same time and there seems to be no way to use a pre-specified JOINing of two tables as a source. The WHERE clause then recognizes only the fields from the first table, not the second one.
Is there an example for this? Joining two (or more) tables, using WHERE to determine the exact row, then using a value from that row?
Best wishes.
I'm a Seam newbie in an already established project, so a lot of code I use is borrowed and I'm not always fully sure how things work. My problem is that I am using a query object extended from EntityQuery to back a list page with search and sort capabilities that needs to search across a many-to-many relationship and a separate many-to-one relationship which must also be used to sort. Because the many-to-many relationship has to be joined in to allow for the search capability, the query returns duplicate records for each assignment. That's not a big deal because I just added "distinct" to the ejbql and that worked fine. However, when I try to order by the other many-to-one relationship, Oracle throws an error. It appears that Oracle will not accept an order by column that is not in the select clause when using the distinct keyword http://ora-01791.ora-code.com/, and http://oraclequirks.blogspot.com/2009/04/ora-01791-not-selected-expression.html.
Here are the relationships as they are defined in the entities: [Subject m:m JobFunction] (obviously through an assignment table [Subject o:m Subject_JobFunction m:o JobFunction]), and [Subject m:o Type]. Because I need to search Subject by JobFunction, it is joined in in the ejbql which requires the distinct keyword to only return distinct Subjects to the list page. When I try to order by the Type.name (through the many-to-one relationship), the resulting query makes Oracle angry and throws the "ORA-01791: not a SELECTed expression" error. SubjectQuery code:
#Override
public String getEjbql() {
return "select subject from Subject subject left outer join subject.jobFunctions as jobFunction";
}
#Override
#SuppressWarnings("rawtypes")
public List<ValueExpression> getRestrictions() {
ValueExpression[] RESTRICTIONS = {
createValueExpression("lower(subject.name) like #{subjectQuery.prepRestriction(subjectQuery.subject.name)}"),
createValueExpression("subject.active = #{subjectQuery.active}"),
createValueExpression("subject.type.name = #{subjectQuery.typeName}"),
createValueExpression("jobFunction.name = #{subjectQuery.jobFunctionName}")
};
return Arrays.asList(RESTRICTIONS);
}
When I set the query order when a user sorts by the Type name through the front end:
"#{subjectQuery.order=='UPPER(subject.type.name) asc'}"
I get the Oracle error. If I take the distinct out of the ejbql, the sort works fine, but I get duplicate Subject records. When I add the distinct keyword the list works fine without duplicate records, but the sort throws an error. Does anyone have any suggestions about how I can restructure the ejbql to return distinct records without the distinct keyword to make the sort happy, or how to do the sort without making Oracle angry that the sort column referenced in the query is not in the select clause? I have read several places that my answer might be in the the Hibernate Criteria API, but I have no idea how to leverage it in the context of an extended EntityQuery class with what I am trying to accomplish. Please Help!
If you are adding a DISTINCT, then something is broken.
"Because the many-to-many relationship has to be joined in to allow for the search capability, the query returns duplicate records for each assignment. "
Consider the case that a person can work on many projects and a project can have many persons. There is a uniqueness of a 'person/project'. If you want a list of people that work in either project A or B (or both) then you may get
FRED/PROJ_A
BILL/PROJ_A
FRED/PROJ_B
TOM/PROJ_B
BILL/PROJ_C
If you only show the names (not the projects), you can still order by project, but you will see
FRED
BILL
FRED
TOM
BILL
If you do a DISTINCT, you can no longer order by project, because you don't know whether the FRED is the one from PROJ_A or PROJ_B or whether BILL comes before TOM (based on PROJ_A) or after TOM (based on PROJ_C).
So remove the DISTINCT and always show the column on which you are ordering (because then you'll see why the duplicates aren't actually duplicates).
I'm not sure how the generated query(ies) is(are) different, but I found an answer. I wasn't aware of the fetch command for hibernate, which fixes the need for the distinct keyword (again, not sure exactly how, maybe by subquerying?). After changing the ejbql to:
#Override
public String getEjbql() {
return "select subject from Subject subject left join fetch subject.jobFunctions jobFunction";
}
the distinct is no longer needed and therefore, Oracle does not complain about the order by column not being in the select clause. The list works as expected and the sort column works! Yay!
Predictably, I found the answer here on stackoverflow. The question was not exactly the same, but the hql syntax worked for me: HQL order by within a collection
I have a simple LINQ EF query below using the method syntax. I'm using my Include statement to join four tables: Event and Doc are the two main tables, EventDoc is a many-to-many link table, and DocUsage is a lookup table.
My challenge is that I'd like to shape my results by only selecting specific columns from each of the four tables. But, the compiler is giving a compiler is giving me the following error:
'System.Data.Objects.DataClasses.EntityCollection does not contain a definition for "Doc' and no extension method 'Doc' accepting a first argument of type 'System.Data.Objects.DataClasses.EntityCollection' could be found.
I'm sure this is something easy but I'm not figuring it out. I haven't been able to find an example of someone using the multi-table include but also shaping the projection.
Thx,Mark
var qry= context.Event
.Include("EventDoc.Doc.DocUsage")
.Select(n => new
{
n.EventDate,
n.EventDoc.Doc.Filename, //<=COMPILER ERROR HERE
n.EventDoc.Doc.DocUsage.Usage
})
.ToList();
EventDoc ed;
Doc d = ed.Doc; //<=NO COMPILER ERROR SO I KNOW MY MODEL'S CORRECT
DocUsage du = d.DocUsage;
Very difficult to know what is going on without a screencap of your model, including the navigational properties on each entity.
But if your saying it's a many-to-many between Event and Doc (with EventDoc being the join table), and assuming your join table has nothing but the FK's and therefore doesn't need to be mapped, then shouldn't a single Event have many Doc's?
This query:
var query = ctx.Event.Include("EventDoc.Doc");
Would imply (based on the lack of pluralization): a single Event has a single EventDoc which has a single Doc.
But shouldn't that be: a single Event has a single EventDoc which has many Doc's.
Therefore your projection doesn't really make sense. Your trying to project to an anonymous type, with EventDate and Filename for a single Doc, but an Event has many Docs.
Maybe a projection like this would be more suitable:
var query = ctx.Event.Include("EventDoc.Docs.DocUsage")
.Select(x => new
{
EventDate = x.EventDate,
DocsForEvent = x.EventDocs.Docs
}).ToList();
And for that you work you need to fix up your model. Im surprised it even validates/compiles.
Either your model is wrong or your description of the database cardinalities in your question is. :)
Of course, i could be completely misunderstanding your database and/or model - so if i am let me know and i'll remove this answer.