EjbRemove, remove(), bean logic, database row logic

In some Sun examples the remove() method is not exposed trhu the home interface, but anyway it is called from the client thru the home interface, I would like to know the reason; another question is the logic after the remove() method exposed thru the remote interface versus the ejbRemove() method exposed (?) thru the home interface, so the question is:
- there is a logic directed to the bean (to delete de entity bean) and another logic directed to the persistent row represented by the bean?.
If I delete a row it is obvious the entity bean representing it should be deleted, but what happens if the client (or the container) invokes ejbRemove() either directly (the container) or trhu the home interface (the client) and I only want to delete the bean, but not the persistent row? Iin fact, the container could call ejbRemove as part of the bean lifecycle, and this should not imply the persistent database row delete, so it appears that the row delete code should not be in the ejbRemove() ?!
thanks.

I think that that the removing of an entity ejb should not imply the removing of the database row, thought the remove of the database row really implies the removing of the entity ejb representation. So, if you code an sql delete statement in the ejbRemove method, it implies that as consequences of the lifecycle of ten entity bean the row could be removed, and I think it is not allway rihgt, for if you want to remove the ejb representing your account (for example), to free server memory, it should not imply that yout account database row should be removed too, unless the ejbRemove method woulnd't be never called by the container, so, to cut it short: what happens if the container, as a consequence of the lifecycle of the bean, call ejbRemove and you coded in this method a sql delete, your account (for example) in your bank would dissapppear!, and you only wanted to free the memory associated to the entity ejb.
I think the remove() and ejbRemove() are tricky!
Maybe I don't understand well the basics of ejb, but I really thought a lot about this question.
thanks!

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    RIL
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    RKM
    Reservations for Account Assignment
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    Logical Database Reference Location
    RMM
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    RNM
    Reservations
    RTL
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    RUL
    Archiving of Posting Change Notices
    S1L
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    S1L_OLD
    Stock by Storage Bins
    S2L
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    S3L
    Stocks
    SAK
    Completely Reversed Allocation Documents
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    SD_ORDER
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    G/L Account Database
    SMI
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    T1L
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    T2L
    Transfer orders for material
    T3L
    Transfer orders for storage type
    T4L
    Transfer order for TO printing
    T5L
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    Treasury
    TIF
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    TPI
    Functional Location Logical Database
    U1S
    User master reorganization: Password changes
    U2S
    User master reorganization: Password changes
    U3S
    User master reorganization: Password changes
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    User master reorganization: Password changes
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    Pricing Report
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    VC2
    Generate Address List
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    Logical Database RV: Sales Documents
    VXV
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    WOI
    Maintenance Item
    WPI
    Maintenance plans
    WTF
    Securities positions and flows
    WTY
    WTY LD
    WUF
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  • Regarding Logical database and  select statement..

    Hi
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    Logical database structures
    There are three defining entities in an SAP logical database. You must be clear on all three in order to create and use one.
    u2022     Table structure: Your logical database includes data from specified tables in SAP. There is a hierarchy among these tables defined by their foreign keys (all known to SAP), and you are going to define a customized relationship between select tables. This structure is unique and must be defined and saved.
    u2022     Data selection: You may not want or need every item in the referenced tables that contributes to your customized database. There is a selection screen that permits you to pick and choose.
    u2022     Database access programming: Once youu2019ve defined your logical database, SAP will generate the access subroutines needed to pull the data in the way you want it pulled.
    Creating your own logical database
    ABAP/4 (Advanced Business Application Programming language, version 4) is the language created by SAP for implementation and customization of its R/3 system. ABAP/4 comes loaded with many predefined logical databases that can construct and table just about any conventional business objects you might need in any canned SAP application. However, you can also create your own logical databases to construct any custom objects you care to define, as your application requires in ABAP/4. Hereu2019s a step-by-step guide:
    1.     Call up transaction SLDB (or transaction SE36). The path you want is Tools | ABAP Workbench | Development | Programming Environment | Logical Databases. This screen is called Logical Database Builder.
    2.     Enter an appropriate name in the logical database name field. You have three options on this screen: Create, Display, and Change. Choose Create.
    3.     Youu2019ll be prompted for a short text description of your new logical database. Enter one. Youu2019ll then be prompted to specify a development class.
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    Why else would you want to create a logical database? Consider that the logical databases already available to you begin with a root node and proceed downward from there. If the data object you wish to construct consists of items that are all below the root node, you can use an existing logical database program to extract the data, then trim away what you donu2019t want using SELECT statementsu2014or you can increase the speed of the logical database program considerably by redefining the logical database for your object and starting with a table down in the chain. Either way, youu2019ll eliminate a great deal of overhead.
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    Arindam

  • Is Logical Database used in ABAP?????

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    which were not used in ABAP.
    And i have read somewhere that LDB's are used in ABAP.
    can plz sumone give a light on this.
    Thanks,
    Sonali

    hi,
    The use of a logical database provides you with an alternative to having to program database accesses individually. Logical databases retrieve data records and make them available to ABAP programs.
    The same logical database can be the data source for several Quick Views, queries, and programs. In the Quick View, the LDB can be specified directly as a data source. A query works with the logical database when the functional area that generated the query is defined with a logical database. In the case of type 1 programs, the LDB is entered in the attributes or called using function module LDB_PROCESS. See appendix for information on how to use the function module.
    Logical databases offer several advantages:
    The system generates a selection screen. The use of selection screen versions or variants provides the required flexibility.
    The user does not have to know the exact structure of the tables involved (especially the foreign key dependencies); the data is made available in the correct order at GET events.
    Performance improvements within logical databases directly affect all programs linked to the logical database, without having to change the programs themselves.
    Maintenance can be performed at a central location.
    Authorization checks can also be performed centrally.
    A logical database is an ABAP program that reads predefined data from the database and makes it available to other programs.
    A hierarchical structure determines the order in which the data is supplied to the programs. A logical database also provides a selection screen that checks user entries and conducts error dialogs. These can be extended in programs.
    SAP provides some 200 logical databases in Release 4.6. The names of logical databases have been extended to 20 places in Release 4.0 (namespace prefix max. 10 characters).
    In the case of executable programs, you can enter a logical database in the attributes.
    Use the NODES statement to specify the nodes of the logical database that You want to use in the program. NODES allocates the appropriate storage space for the node - that is, a work area or a table area depending on the node type.
    The logical database makes the data records available for the corresponding GET events.
    The sequence in which these events are processed is determined by the structure of the logical database.
    Logical databases are made up of several sub-objects. The structure determines the hierarchy, and thus the read sequence of the data records.
    Hope this helps, Do reward

  • Logical database definition

    Hi Experts ,
    I am trying to execute a program with logical database .
    It is showing error that logical database is unknown.
    REPORT  ZHRTRAIN.
    tables :pernr.
    Infotypes: 0002.
    data: begin of name,
    nachn like p0002-nachn,
    vorna like p0002-vorna,
    end of name.
    select-options : nation for p0002-natio.
    GET PERNR.
      provide * from p0002 between pn/begda and pn/endda.
      check nation.
      move-corresponding p0002 to name.
      condense name.
      write : / p0002-pernr,
      name,
      p0002-natio,
      p002-gebat.
      endprovide.
    Pls tell me how to correct this error.
    Thank you.
    Regds,
    devika.

    HR Logical Databases
    In Human Resources (HR), the following logical databases can be used as a data source for HR InfoSets:
    PNP
    PAP
    PCH
    By selecting a logical database, you determine the HR data that can be reported on using an InfoSet.
    Logical Database PCH
    This logical database generally enables you to report on all HR infotypes. However, you are advised not to use this logical database unless you want to report on Personnel Planning data.
    Logical Database PNP
    Use logical database PNP to report on HR master data. It is possible to use logical database PCH to access this data, but PNP meets such reporting requirements more quickly because it is best suited to the task of selecting persons.
    Logical database PNP enables you to access HR master data and infotypes from Personnel Planning. For example, you have the following options:
    Reporting on the costs, number of attendees booked, and instructor for a business event on which an employee is booked
    Reporting on working time and planned compensation for a position that an employee occupies
    Reporting on the validity and proficiency of a qualification that an employee fulfils
    From a technical perspective, this means you can use PNP to report on all of the infotypes that exist for objects (infotype 1000) that have a direct relationship (infotype 1001) with the Person object.
    The ability to access infotypes from Personnel Planning using logical database PNP is a special feature that you can only use in the context of SAP Query and Ad Hoc Query. You cannot use this functionality for ABAP reports you programmed yourself.
    You can also use logical database PNP to report on data from Personnel Time Management (infotypes 2000 to 2999) and Payroll (special payroll infotypes for the USA and customer infotypes; for more information, access Customizing for the Human Resources Information System and see Payroll Results).
    Logical Database PAP
    Logical database PAP enables you to access data from Recruitment.
    See also:
    HR InfoSets for InfoSet Query
    InfoSets in the HR Application

  • Difference between PNP and PCH logical database

    WHats the difference between PNP nd PCH? When to use which??
    Tx

    Hi,
    The Difference is only with in an SAP R/3 system in which Concurrent Employment is active, reports are executed by the PNPCE logical database. The general logic of the PNPCE logical database corresponds to the PNP logical database. The PNPCE logical database can also process the concept of Concurrent Employment.
    HR Logical Databases
    In Human Resources (HR), the following logical databases can be used as a data source for HR InfoSets:
    PNP (PNPCE)
    PAP
    PCH
    By selecting a logical database, you determine the HR data that can be reported on using an InfoSet.
    Logical Database PCH
    This logical database generally enables you to report on all HR infotypes. However, you are advised not to use this logical database unless you want to report on Personnel Planning data.
    Logical Database PNP (or PNPCE)
    Use logical database PNP to report on HR master data. It is possible to use logical database PCH to access this data, but PNP meets such reporting requirements more quickly because it is best suited to the task of selecting persons.
    Logical database PNP enables you to access HR master data and infotypes from Personnel Planning. For example, you have the following options:
    Reporting on the costs, number of attendees booked, and instructor for a business event on which an employee is booked
    Reporting on working time and planned compensation for a position that an employee occupies
    Reporting on the validity and proficiency of a qualification that an employee fulfils
    From a technical perspective, this means you can use PNP to report on all of the infotypes that exist for objects (infotype 1000) that have a direct relationship (infotype 1001) with the Person object.
    The ability to access infotypes from Personnel Planning using logical database PNP is a special feature that you can only use in the context of SAP Query and Ad Hoc Query. You cannot use this functionality for ABAP reports you programmed yourself.
    You can also use logical database PNP to report on data from Personnel Time Management (infotypes 2000 to 2999) and Payroll (special payroll infotypes for the USA and customer infotypes; for more information, access Customizing for the Human Resources Information System and see Payroll Results).
    Logical Database PAP
    Logical database PAP enables you to access data from Recruitment.
    Check this link for more details
    http://help.sap.com/saphelp_erp2004/helpdata/en/e1/e1f83f6e5a11d687620000e82158f1/frameset.htm
    <b>Reward points</b>
    Regards

  • Related to logical database

    q1]]   What is the difference between LOGICAL DATABASE and VIEWS?
    q2]]  Why are <b>alphaneumeric characters</b> called so ?

    Hi
    <i>q1]] What is the difference between LOGICAL DATABASE and VIEWS?</i>
    <b>Logical Databases</b>
    Logical databases are special ABAP programs that retrieve data and make it available to application programs. The most common use of logical databases is still to read data from database tables by linking them to executable ABAP programs.
    Logical databases contain Open SQL statements that read data from the database. You do not therefore need to use SQL in your own programs. The logical database reads the program, stores them in the program if necessary, and then passes them line by line to the application program or the function module LDB_PROCESS using an interface work area.
    <i>Logical Databases - Views of Data</i>
    A logical database provides a particular view of database tables in the R/3 System. <u><i>It is always worth using logical databases if the structure of the data that you want to read corresponds to a view available through a logical database.</i></u>
    Please got through the link where you can find how create or modify logical database.
    http://www.datamanagementgroup.com/Resources/Articles/Article_1005_2.asp
    <i>q2]] Why are alphaneumeric characters called so ?</i>
    Alphanumeric characters are combination of alphabets including Uppercase letters (A..Z) and lowercase letters (a..z) , and Numerals(0123456789) .
    This Can be defined with character strings.
    A character string is a data type that consists of a series of alphanumeric characters.
    Each character string has a code attribute (ASCII, EBCDIC, or BYTE). It defines the sort sequence to be used for comparing values.
    Regards,
    Raghav
    Message was edited by:
            Raghavendra  L

  • Logical database excess problem

    hi frends,
    is it possible to make single report for using multiple logical databases ?

    Logical database as the name suggests is a logical combination of related tables along with their common selection criteria and database access routines. Now if you want to use more than one logical database, then you are basically accessing unrelated tables (or at least as per the definition of a logical database) and that defeats the purpose of a logical database which offers some benefits of reusable selection criteria and faster database access.
    That is the reason why SAP gave you an option to specify only one logical database in the attributes. Apart from this there may some technical limitations in providing such a feature, for instance what if you use 100 logical databases in a report, can the combined selection screens of all the logical databases be generated and handled? Can all the database access routines be loaded at the same time into the memory? So it may be both technical implementation limitations as well as logical reasoning that lead SAP to limit it to one LDB.

  • Logical database-customer

    Hi,
    I'm trying to extract cust related details, for which i'm using logical database.
    Logical database DDF is general data specific,
    Is there any other locgical database which contains all customer master tables ie.s
    general -company code data & sales area data.

    Hi,
    Try with SD_KUSTA.
    Regards,
    Lionel

  • Genric extractor on logical database

    Hi
    I have a requirement to create a generic datsource.
    the requirement is to pull the data from logical database
    the logical data base consists of tables and structures.
    could pls let me know how would i create a generic datasource to pull the data from logical database.
    Thanks,
    D

    Hi
    Determining the Generic Delta for a DataSource
           1.      Choose Generic Delta.
           2.      In the subsequent dialog box, specify the delta-determining field and the type for this field.
           3.      Maintain the settings for the generic delta:
                                a.      Specify a security interval.
    The purpose of a security interval is to make the system take into consideration records that appear during the extraction process but which remain unextracted (since they have yet to be saved) during the next extraction.
    You have the option of adding a security interval to the upper limit/lower limit of the interval.
    b.      Choose the delta type for the data to be extracted.
    The delta type is used to determine how extracted data is interpreted in BW and which data targets in which it can be posted.
    With the delta type additive delta, the record to be loaded for summarizable key figures only returns the change to the key figure. The extracted data is added in BW. DataSources with this delta type can supply both ODS objects and InfoCubes with data.
    With the delta type New Status for Changed Records, every record to be loaded returns the new status for all key figures and characteristics. The values are overwritten in BW. DataSources with this delta type can write the data into ODS objects and master data tables.
           4.      Save your entries.
    Delta transfer is now possible for this DataSource.
    After generating the DataSource, you can see this from the marking for the field Delta Update on the DataSource: Customer Version screen.
    Example for Determining the Selection Interval for a Generic Delta
    Safety Interval Upper Limit
    The delta-relevant field is a timestamp.
    The timestamp that was read last is 12:00:00. Delta extraction begins at 12:30:00. The safety interval for the upper limit is 120 seconds. The safety interval for the delta request is: 12:00:00 to 12:28:00. Upon completion of the extraction, the pointer is set to 12:28:00.
    Safety Interval Lower Limit
    The delta-relevant field is a timestamp. After images are transferred. In other words, the record is overwritten with the status after the change in BW, for example for master data. Any duplicate records that appear have no effect upon the BW system.
    The last changed timestamp is 12:28:00. Delta extraction begins at 13:00. The safety interval for the lower limit is 180secs. The safety interval for the delta request is: 12:25:00 to 13:00:00. Upon completion of the extraction, the pointer is set to 13:00:00.

  • Do I need to do authority check for Logical Database?

    Hi,
    Just to check, do I need to code authority check into a Logical Database or Logical Database will do the check by itself without me coding?
    This is because I have a user which does not have rights to infotypes 2000 and above and the logical database still show the user data which belongs to the infotypes 2000 and above.
    If I have to code it, how do I go about to do the coding of authority check?
    Thanks in advance.  Will reward points for good solutions.
    Lawrence

    Let me give an example
    Tables : pernr.
    infotypes: 0000, 0001, 2001.
    Get pernr.
    Do you mean that the 'get pernr' command will not return any data for users who do not have authorisation for infotype 2001?

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