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checking a value in a db before inserting

Thread began 2/01/2011 12:32 pm by Brad Lawryk | Last modified 2/07/2011 1:21 pm by Jason Byrnes | 1198 views | 5 replies |

Brad Lawryk

checking a value in a db before inserting

Using the DataAssist Insert is there a way to check a value in an exsisting recordset before inserting?

Here is what I need to do:

I have two tables that both have date fields in them. Data is already collected for table 1.

What I need to do is when the user enters a date in the second table, it needs to check that the date enters is not later than the date in table 1 before inserting this new record.

So, if the date in table 1 is 2011-01-31 then when a user goes to enter a date in table 2 it has to be before or equal to that date or else the form does not submit.

Is there such a trigger with DataAssist?

Thanks
Brad

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Jason ByrnesWebAssist

you would need to create a recordset to compare the entered date with the date in table 1

SELECT table1.DateColumn from table1 where DateColumn >= paramEnteredDate


create a parameter:
Name: paramEnteredDate
Type: Date
Default Value: -1
Runtime Value: $_POST['dateFormElement']


you may need to use date formatting on the DateColumn to get the entered format to match the format in the database:
date-and-time-functions.html

Then in the Insert Record behavior for table 2, you can use the Recordset Not Empty trigger.

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Brad Lawryk

That makes good sense. Can you set two triggers to a form? Wouldn't I also have to set a trigger for when the submit button is pushed?

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Jason ByrnesWebAssist

Well, with the way the recordset is configured, it can only return a record if the form is submited.

By Setting the default value of the parameter to use -1, the recordset will never return a value unless the form post is present. so using the Recordset not empty trigger is in essence using the Form Post AND Recordset not Emtpy trigger.

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Brad Lawryk

Thanks Jason,

That worked but just kept submitting the page as soon as it was loaded. Is there a way to prevent it until data is actually entered?

My work around was to set a date far into the future as the default.

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Jason ByrnesWebAssist

I guess you could create a record to query the first table to see if it is empty or not, the set the trigger for the server validation to use Recordset not empty.

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