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BS-BOPF Basic Training
08 Queries
BOPF Team
29 July 2010
SAP 2007 / Page 2
Agenda
1. Introduction
2. Creating a Query
3. Implementation of a Custom Query
4. Questions and Answers
Introduction
The application for maintaining customer invoices shall offer a screen in order to display all
overdue invoices. This is realized by the help of a query located at the customer invoice
business object returning the affected invoices.
SAP 2007 / Page 3
I would like to see all
overdue invoices
SAP 2007 / Page 4
A query is a business object entity and is always assigned to a certain node, whose
instances shall be returned
The consumer is able to query either only the keys or the whole data of the resulting
node instances
Queries never modify any node instance data*
There are three types of queries:
Node Attribute Query
Custom Query
Generic Result Query
Introduction
Query Definition
SAP 2007 / Page 5
Resolved by BOPF DAC without any implementation effort
There are two inbuilt node attribute queries available:
SELECT_ALL:
No query parameter structure
Returns all node instances of the assigned node
of the query
SELECT_BY_ELEMENTS:
Query parameter structure corresponds to a
range table related to the assigned nodes attributes
Returns only node instances of the assigned
node whose attributes are compliant to this range
table
Query Types in Detail:
Node Attribute Query
SAP 2007 / Page 6
Custom Query
Necessary in order to provide application specific
queries, whose logic is not covered by node attribute
query
Resolved by the help of an implementing class
Query parameter structure is arbitrary
Returns only node instances of the assigned node of
the query
Example: GET_OVERDUE_INVOICES
Generic Result Query (special kind of Custom Query)
Necessary in rarely use cases, which can not be
realized with custom queries due to performance
reasons (e.g. denormalized read only lists for the UI)
May return arbitrary data tables (but these must
contain a KEY component relating to the instances of
the assigned node)
Must only be used after consultation of your local
BOPF expert!
Query Types in Detail :
Custom Query and Generic Result Query
SAP 2007 / Page 7
Agenda
1. Introduction
2. Creating a Query
3. Implementation of a Query
4. Questions and Answers
Creating a Node Attribute Query
(SELECT_ALL or SELECT_BY_ELEMENTS)
In order to create a SELECT_ALL query, just create a query and name it SELECT_ALL (or SELECT_BY_ELEMENTS if the query parameters are equal to the attributes of the assigned node).
SAP 2007 / Page 8
Creating a Custom Query
Maintain the implementing class and the data type:
The query class must implement interface /BOBF/IF_FRW_QUERY and contains the query logic
The data type can be an structure with arbitrary components and could be used by a generic UI do
display a range table based input form. At runtime, as soon as the query is executed after the form
is filled, the parameter IT_SELECTION_PARAMETERS is handed over containing those values.
Each line of it represents a value range related to a component contained in this data type (but
not each component of the data type must always have a corresponding line in
IT_SELECTION_PARAMETERS handing over a value range is optional). The query implementation can use the selection parameters for dynamically selections.
SAP 2007 / Page 9
SAP 2007 / Page 10
Agenda
1. Introduction
2. Creating a Query
3. Implementation of a Custom Query
4. Questions and Answers
SAP 2007 / Page 11
methods QUERY
importing
IS_CTX type /BOBF/S_FRW_CTX_QUERY
IT_FILTER_KEY type /BOBF/T_FRW_KEY optional
IT_SELECTION_PARAMETERS type /BOBF/T_FRW_QUERY_SELPARAM optional
IS_QUERY_OPTIONS type /BOBF/S_FRW_QUERY_OPTIONS optional
IO_QUERY type ref to /BOBF/IF_FRW_QUERY
IO_READ type ref to /BOBF/IF_FRW_READ
IO_MODIFY type ref to /BOBF/IF_FRW_MODIFY optional
exporting
EO_MESSAGE type ref to /BOBF/IF_FRW_MESSAGE
ET_KEY type /BOBF/T_FRW_KEY
ES_QUERY_INFO type /BOBF/S_FRW_QUERY_INFO
ET_DATA type index table
raising
/BOBF/CX_FRW .
QUERY
RETRIEVE_DEFAULT_PARAM
(optional)
Queries are classes implementing the /BOBF/IF_FRW_QUERY interface.
methods RETRIEVE_DEFAULT_PARAM
importing
IS_CTX type /BOBF/S_FRW_CTX_QUERY
changing
CT_SELECTION_PARAMETERS type /BOBF/T_FRW_QUERY_SELPARAM
raising
/BOBF/CX_FRW .
Overview of a Query Implementation
RETRIEVE_DEFAULT_PARAM Method
methods RETRIEVE_DEFAULT_PARAM
importing
IS_CTX type /BOBF/S_FRW_CTX_QUERY
changingCT_SELECTION_PARAMETERS type /BOBF/T_FRW_QUERY_SELPARAM
raising
/BOBF/CX_FRW .
Retrieves the default parameters of a query.
IS_CTX: Context information about the query
CT_SELECTION_PARAMETERS: Reference to the parameters of the query which shall be filled with default values by the help of this method
SAP 2007 / Page 12
QUERY Method
methods QUERY
importing
IS_CTX type /BOBF/S_FRW_CTX_QUERY
IT_FILTER_KEY type /BOBF/T_FRW_KEY optional
IT_SELECTION_PARAMETERS type /BOBF/T_FRW_QUERY_SELPARAM optional
IS_QUERY_OPTIONS type /BOBF/S_FRW_QUERY_OPTIONS optional
IO_QUERY type ref to /BOBF/IF_FRW_QUERY
IO_READ type ref to /BOBF/IF_FRW_READ
IO_MODIFY type ref to /BOBF/IF_FRW_MODIFY optional
exporting
EO_MESSAGE type ref to /BOBF/IF_FRW_MESSAGE
ET_KEY type /BOBF/T_FRW_KEY
ES_QUERY_INFO type /BOBF/S_FRW_QUERY_INFO
ET_DATA type index table
raising
/BOBF/CX_FRW .
Executes the query logic.
SAP 2007 / Page 13
Query Method Parameters (1/2)
Importing Parameters
SAP 2007 / Page 14
IS_CTX: Context information about the query (BO key, root node key, assigned node key,)
IT_FILTER_KEY: If the query shall take only a restricted set of the node instances into account, these can be specified by the consumer with the help of this parameter. If the parameter is empty, all node instances of the query's assigned node are affected by the query.
IT_SELECTION_PARAMETER: This parameter represents a range table of attributes of the query parameter structure. If attributes are supplied, only these must be filled the other attributes have not to be filled if this increases the performance.
IS_QUERY_OPTIONS:
MAXIMUM_ROWS: Maximal number of node instances, which shall be returned by the query. In case of activated paging, the number of node instances of a single page.
SORTING_OPTIONS: The sorting of the result can be influenced by the help of this parameter. It consists of a table allowing to specify the sorting order ascending/ descending for the columns (=attributes).
PAGING_OPTIONS: This parameter allows to configure the paging options.
PAGING_ACTIVE: yes/no
Topmost instance of the current page can either be defined by row (START_ROW) or by key of the instance (START_KEY)
IO_QUERY: Reference to an object allowing the execution of a further query
IO_READ: Reference to an object implementing the read interface to read instance data.
IO_MODIFY: Reference to an object implementing the modify interface to modify instance data.
SAP 2007 / Page 15
EO_MESSAGE: This message object contains all messages, which have been created during the execution of the query.
ES_QUERY_INFO: This parameter contains the query handle and the paging related information.
COUNT: Total number of results
QUERY_HANDLE: Obsolete
ET_DATA: Returning table for generic result queries
ET_KEY: This parameter represents a set of the keys of the node instances, which are the result of the query.
Query Method Parameters (2/2)
Exporting Parameters
SAP 2007 / Page 16
Agenda
1. Introduction
2. Creating a Query
3. Implementation of a Query
4. Questions and Answers
Questions and Answers (1/2)
Must SELECT_BY_ELEMENTS and SELECT_ALL queries be implemented?
No, if the /BOBF/CL_DAC_TABLE is used, these queries are automatically resolved.
May queries be assigned to nodes located at a Dependent Object?
No, for instance a SELECT_BY_ELEMENTS query would return all instances fulfilling the
search criterias. If a DO is used in several Business Objects, this result is not related on one
single DO use case and thus the result makes no sence.
Is it possible to set properties for Queries (e.g. enable/ disable)?
No, queries are not node instance related thus node category dependent properties and
dynamic properties do not cover queries.
May I use Queries within entity implementations (e.g. in an action)?
No, queries are only intended to be used by consumers or other queries. Usually you have
node instance keys provided by the BOPF (IT_KEY importing parameter), which can be used
to retrieve/ retrieve_by_associations further related instances. In addition, you can use
convert_alternative_key in order to receive further node instances.
If a new node instance is created during a transaction, will a query executed later on in
the same transaction be able to return it?
No, queries only operate on the database image, which means that the changes done so far
in the current transaction are not taken into account. This is a difference in contrast to
convert_altern_key and retrieve/ retrieve_by_association.
SAP 2007 / Page 17
Questions and Answers (2/2)
Queries must not change instance data, but why do I need io_modify importing parameter at all?
If a custom query is assigned to a transient node, the query must write the result instances
to the transient node. This ensures, that the consumer is able to get them using for instance
the retrieve core service.
Is it possible to reuse other queries in the implementation of a custom query?Use importing parameter IO_QUERY->QUERY() in order to call a certain query located at the same BO.
Shall I use the io_read importing parameter or an SQL statement to the nodes database table in the implementation of a custom query?
Use always a SQL statement in order to ensure, that the query returns only instances of the
database state and for performance reasons.
Is it necessary to provide the paging and sorting feature for each query?Yes, this is part of the query contract which must be fulfilled by each query a consumer must be able to rely on that.
SAP 2007 / Page 18
SAP 2007 / Page 19
Questions?
SAP 2007 / Page 20
Thank you!
SAP 2007 / Page 21
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