Posts Tagged ‘ADF BC’

How to Control Row Removal in ADF BC by Andrejus Baranovskis

Posted: November 20, 2016 in JDeveloper & ADF
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There is a flaw in ADF BC remove operation. Row could be successfully removed in ADF BC – it dissapears from UI as well, but if there is DB integrity constraint violation – row is not removed in DB and error message is displayed to the user. This could be misleading to the user, he sees message about failed removal, but at the same time row is not present anymore.
Easier to explain with example. Let’s imagine we want to remove IT_PROG job (there are employees assigned with this job and row removal would fail in DB):

On delete, row is removed from ADF BC and UI, but operation fails in DB and error is returned: Read the complete article here.

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ADF BC Range Paging and ADF UI Table Pagination Use Case by Andrejus Baranovskis

Posted: November 19, 2016 in JDeveloper & ADF
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ADF UI table pagination and ADF BC range paging sounds like a perfect combination. But to make it work perfect, a bit of extra effort is required. In the case of search/edit implementation, it can’t remember updated record when navigating back to search screen (VO runs with Range Paging and UI table is displayed with pagination). I will explain how to solve it and show how to keep UI table displaying current page and prevent jumping to the first page.
Here is the working use case (download sample application – SearchEditApp.zip). Navigate to any page except first in UI table and select a record:

On edit, selected record should be opened in the fragment. Both buttons Save and Close/Close would return back to search screen, where current record and page should be preserved: Read the complete article here.

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JET Input Search with ADF BC REST by Andrejus Baranovskis

Posted: October 1, 2016 in JDeveloper & ADF
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LOV is popular component in ADF, it allows to seach for data entry in the list, select it and assign to the attribute. I was researching, how similar concept can be implemented in Oracle JET, based on data from ADF BC REST service. JET Input Search component seems to be useful for LOV like behavior implementation.
Job ID field is implemented with Input Search. It is based on value/label pair, user enters label and in the background selected value is returned and assigned to the attribute:

Watch this recording, to see how was it is. Search is performed on client side and value selection is instant:

List is being filter when user types value (you can configure it, to start filtering after user enters certain number of charachters): Read the complete article here.

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JET Master-Detail with ADF BC REST by Andrejus Baranovskis

Posted: September 29, 2016 in JDeveloper & ADF, Mobile
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One of the most typical use cases in enterprise applications – Master-Detail relationship implementation. I have decided to implement it in JET and to share this practical implementation with you. Hopefully it will be useful, when you will be learning and building JET applications.
Sample application – JETCRUDApp_v8.zip implements a table with row selection in JET (you must run ADF BC REST application in JDEV 12.2.1 and JET in NetBeans 8). On row selection, Job ID is retrieved from selected row and based on this – Job data is fetched. Minimum and Maximum salary values are fetched from Job data and displayed in the chart, along with selected employee salary. I’m executing separate REST call for each new selection in the master and detail data change, see how fast data is being changed in the chart:

Detail data displayed in the chart is fetched based on Job ID selected in the master table:

Each time when new row is selected in the table, chart is changed (REST call to ADF BC is executed in the background, using Job ID for selected employee as a key): Read the complete article here.

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ADF BC View Criteria Query Execution Mode = Both by Andrejus Baranovskis

Posted: August 6, 2016 in JDeveloper & ADF
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View Criteria is set to execute in Database mode by default. There is option to change execution mode to Both. This would execute query and fetch results from database and from memory.  Such query execution is useful, when we want to include newly created (but not commited yet) row into View Criteria result. Newly created row will be included into View Criteria resultset.
Download sample application – ViewCriteriaModeApp.zip. JobsView in sample application is set with query execution mode for View Criteria to Both:

I’m using JobsView in EmployeesView through View Accessor. If data from another VO is required, you can fetch it through View Accessor. View Accessor is configured with View Criteria, this means it will be automatically filtered (we only need to set Bind Variable value):

Employees VO contains custom method, where View Accessor is referenced. I’m creating new row and executing query with bind variable (primary key for newly created row). View Criteria is set to execution mode Both, this allows to retrieve newly created row (not committed yet) after search: Read the complete article here.

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Change ADF BC Data Update Locking with FOR UPDATE WAIT by Andrejus Baranovskis

Posted: August 5, 2016 in JDeveloper & ADF
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Each time when data is changed and updated through ADF BC, before posting changes to DB, SQL query with FOR UPDATE NOWAIT is generated and executed. In case if other process locks row to be updated, or another user in the same moment is updating it, error will be generated and update will be stopped. There might be use cases, when you would like to wait for certain period of time, until row will be unlocked and then commit row changes. This is especially true, if 3rd party (PL/SQL) process is updating rows and you have defined change indicator attribute in ADF BC (see my previous post – ADF BC Version Number and Change Indicator to Track Changed Rows).
We can change default behavior, instead of requesting for immediate lock – we can wait a period of time. If lock becomes available during this period, session acquires lock. If row remains locked, error is returned. Instead of default FOR UDPATE NOWAIT, we can generate FOR UDPATE WAIT (time period in seconds).
To override default behavior, we need to specify custom SQLBuilder class. This can be registered in Application Module configuration jbo.SQLBuilder property:

Class must extend from OracleSQLBuilderImpl and override getSqlVariantLockTrailer() method. My sample application is implemented to return FOR UPDATE WAIT 30:

We can do a test. We can simulate PL/SQL lock by executing SQL query with FOR UPDATE from SQL Developer: Read the complete article here.

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Programmatically Select all values in ADF BC based selectMany (af:selectManyCheckbox, af:selectManyChoice, af:selectManyListbox, af:selectManyShuttle) component by Ashish Awasthi

Posted: August 2, 2015 in JDeveloper & ADF
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Previously i have posted a lot about component that supports multiple selection in ADF Faces (af:selectManyCheckbox, af:selectManyChoice, af:selectManyListbox, af:selectManyShuttle)
– Multiple Selection in ADF Faces
This post is about selecting all values in a component programmatically on a event like button click, value change event etc.
Note that this post is designed for ADF BC (viewObject) based components , to set values in bean based component check this-
Programmatically populate values in ADF Faces multiSelect component (af:selectManyCheckbox, af:selectManyChoice, af:selectManyListbox, af:selectManyShuttle)
So for this i have just dropped Departments viewObject as multiSelect component on page
(af:selectManyCheckbox, af:selectManyChoice, af:selectManyListbox, af:selectManyShuttle)

Page bindings section looks like this-Read the complete article here.

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