Databases
StackOverflow2013
Postsdbo
POTClientDataSet and processing records with StatusFilter
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POTClientDataSet and processing records with StatusFilter
    primarykey
    data
    text
    <p>I'm using a <code>TClientDataSet</code> as a local dataset without the provider concept. After working with it a method is called that should generate the corresponding SQL statements using the <code>StatusFilter</code> to resolve the changes (generate SQL basically).</p> <p>This looked easy initially after reading documentation (set <code>StatusFilter to [dsInsert]</code>, process all inserts SQL, set <code>StatusFilter to [dsModified]</code> process all updates, the same with deletes) but after a few tests now looks far from trivial, for example:</p> <p>If I add a record, then edit it: setting the <code>StatusFilter to [dsInserted]</code> displays it, but with the original data.</p> <p>If I add a record, then edit, then delete it: the record appears with <code>StatusFilter set to [dsInserted] and [dsModified]</code> also.</p> <p>And other similar situations..</p> <p>1) I know that if first I process all inserts, then all updates then all deletes the database will be updated in the correct state but it looks far from right this approach (generating useless sql statements).</p> <p>2) I've tried to access the <code>PRecInfo(ClientDataSet.ActiveBuffer + ClientDataSet.RecordSize).Attribute</code> information (dsRecNew, dsRecOrg, etc.) but still not manage to resolve the logic.</p> <p>3) I can program the logic to resolve it, for example before processing and insert, set <code>StatusFilter to [dsDeleted]</code>, and locating by the primary key if the record to see if its deleted thereafter.. the same with edits, before inserting, checking if the record was updated after so the insert sql in the updated version and so on.. but it should be more easy..</p> <p>¿Did someone tried to solve this in an elegant and straightforward way? ¿I'm missing something? Thanks </p>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USpragmatic_programmer
    plurals
    1. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. VO
      singulars
      1. POTClientDataSet and processing records with StatusFilter
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POTClientDataSet and processing records with StatusFilter
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. POTClientDataSet and processing records with StatusFilter
      1. This table or related slice is empty.
      1. VTUpMod
    1. COStrongly related: [to track the modified rows and manually update from the TClientDataSet's Delta](http://stackoverflow.com/questions/3027852). Have to read the comments to the answers to make some some sense out of that thread though, might not be fun..
      singulars
      1. POTClientDataSet and processing records with StatusFilter
      1. USSertac Akyuz
    2. CO@SertacAkyuz: the problem it's stated but not resolved in that question.. I'm precisely asking how to deal with the "multiple records versions" that you mencion in your comment..
      singulars
      1. POTClientDataSet and processing records with StatusFilter
      1. USpragmatic_programmer
    3. COWell, it seems to have been resolved to me (even if in the comments) ... (you've clicked the "add / show 10 more comments"link?)
      singulars
      1. POTClientDataSet and processing records with StatusFilter
      1. USSertac Akyuz
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload