Raw Data/binary Field, Or A Workaround?
Jan 29, 2007
Hi there,
I have a simple bit of VBcode in my database which reads the password a user enters and 'encrypts' it for storing in the user table. It's more obfuscation than encryption to be honest, and I feel limited by the 'text' data type assigned to the password field.
At the moment it works by taking the password entered, and converting the whole lot into a byte array, then for each 'character' in the array, changing its binary value. At the moment it's then converted back into a string and dumped into the 'password' field, as garbage characters. But they are still characters, and if I go out of range of the character set it results in horrible errors :D.
I feel I may be missing the blindingly obvious and could just not convert it back to string, and write the binary into a text field instead, but I'm not sure how I'd get intelligible data back.
The reason it's not exactly encryption is because the key is the same for all characters on all passwords (I just multiply the binary value by 2!) what I want is to have a key as well, stored in another field alongside, but again can't implement this due to character-set range issues.
So my question is - is there a 'raw' data field hidden somewhere amongst the features of microsoft access, or should I be thinking about just storing the numbers themselves? For the moment I'll investigate the latter, but I'll appreciate any help! Thanks :)
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May 10, 2014
i want to copy binary data to another table with same structure.
how can i do this.
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Jan 31, 2008
This the first time I post in this forum and I tried looking for an answer to my question before posting, so I apologize if my question has been answered previously.
Is it possible to determine, in Access 2000, the data type in a Make-Table query of a new column with null value so that it does not default to binary.
Here is my sample sql:
SELECT tblAddressBook.Name, Null AS Email INTO tblTestTable
FROM tblAddressBook;
The output is tblTestTable with two columns: Name and Email. The data type of column Email defaults to Binary. How do I make it default to Text.
Thank you.
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Aug 1, 2005
ok, i've discovered filtering does not work on subforms so i have searched the forum and modified some code to this:
Dim strSQL As String
strSQL = "Select * from tasks where"
strSQL = strSQL & Me!frmSubProjects.Form!Project = 2
Me!frmSubProjects.Form.RecordSource = strSQL
error message is " can't find the field 'frmSubProjects' referred to in your expression. (line3)
Please note a 'mouse over' of Me!frmSubProjects.Form!Project in the above code does show a result (first 'Project' value in subform) - so what am i doing wrong??
thanks in advance,
Paul
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Mar 30, 2007
Table A has a field for Full Name (Bob Jones)
Table B has two separate fields for first and last (Bob and Jones). Table B's contents are actually based on an XML import so I can not just change the table structure.
I want to join the content from these two tables together based on full name.
So first I created a query on table B with a new field created with the expression =[First] & " " & [Last].
I then created a query with table A and query B where I joined the two full-name columns together.
This works perfectly. However, I can't edit the values in this query and I believe from the help files that it's because there's a calculated column in one of the tables.
Is there a way to get around this?
I thought maybe inside my ImportXML VB function once I imported the XML data I could populate an empty column with First + Last but I've read about 50 articles and they're all over my head and I can't figure out how to just concatenate the two columns together into one using VB. It seems if I did this I would avoid having to use a calculated column in a query and this would fix my problems.
Any help would be greatly appreciated. Thanks so much!
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Nov 3, 2006
Hi, I know well that combo box has a 64k limit, and whilst there are obvious work around, does anyone here have any sample code for such a solution?
I'm not an expert ms access programmer, and it would save me a lot of time if I had an example to work with.
Thanks
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Jul 24, 2006
I am looking for some help, I have a access database that is interfacing to a sql storage.
The problem I am having, is I have a Image that is containing archives for emails, however I have been yet to figure out hor to read that text stored in the image.
So far I have been able to come up with the data being stored in binary, but am unable to read it in a access form.
Make sence? Hope so.
Through SQL, I am able to run a query to read the data:
SELECT CONVERT(varchar(8000),CAST (body AS binary(8000) )) from arc_bodies
However I would like this text to be read through a form in access, and am unable to figure out how... Please help if possible, would be greatly appreciated.
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Jan 6, 2006
I am trying to store binary values (as decimal long integers) and then use bitwise comparisons to update the values. MS help suggest that the standard logical operators (And or etc) can do bitwise comparison as opposed to comparing boolean logical values for expressions; but I have found no way of making this work.
Is this possible? Any ideas. Doing it mechanically, by splitting the decimal into the relevant parts for any bit is very tedious!
Gibbo
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Dec 6, 2006
Hi
I have a problem in binary type in access
I have some values that are between 1 to 32 byte
I want to specify the type of my field to something like "varbinary" such as SQL server but I have not this type
actually I used OLE object type but it doesn't like it.
for example when I use:
insert into t_t1(i,j) values(1,23)
while j's type is OLE object,
the row is inserted but I can not see the value of j column and I can not select on j column too for example
select * from t_t1 where j=23
has no result.
furthermore, I want to use hex values but I can not do it.
when I use
insert into t_t1(i,j) values(1,0xAD)
I got an error that says the type is mismatched
I know it may shows I expect unreasonably from access but please help me to find the solution
thanks for your attention
Best regard
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Sep 24, 2013
I have a text column with hexadecimal strings like "4E1B0A65FE3299FE", ie. of length 16.I'm doing an ALTER COLUMN query to convert the column to varbinary, but Access is doing conversion by ASCII, which results in a varbinary field of size 32, I think this is because the text column is in Unicode.
SQL Server has something called "styles" which are used with CONVERT.where you can choose to convert by two characters at a time 2:1..How do I do the same in an Access query? CONVERT/CAST are no supported.
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May 30, 2013
I have requirement to draw a binary tree in forms, how to implement this?
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Oct 7, 2014
I am looking for a function that will allow me to encrypt/decrypt single image files as and when required. I have built my own simple one to encrypt a string that will be stored in a filename as all the ones I found created unusable filenames.
However I don't know where to start with the image file encryption.
(Any better way to encrypt a string that can be used in a file name that would be great too. My method is a bit basic).
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Apr 8, 2013
I am working on a project that requires data transfer using TCPIP sockets. I am using a 3rd party Library (Ostrosoft) that handles the wsock32.dll api calls.
The project calls for the creation of a header that logs into a user account.
The first part of the header is a marker, with a value of 4,275,878,552. It is to be supplied in a Binary format of length 4.
My quesion is "How do I create this marker".
What I have tried so far is a string variable - strMarker thus:
strMarker = ChrB(&HFE) & ChrB(&HDC) & ChrB(&HBA) & ChrB(&H98)
Using the ChrB function to convert the Hex version of that number (FEDCBA98)
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Oct 15, 2014
How Mark disappear field data based on field data last.
Example:I have a field type in the name and on behalf of another field No.
In the case of the Type-B data is deleted Number field, which is before the character.
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Apr 16, 2014
I have data from a survey with qualitative responses. For a single qualitative question, I moved the ID & responses into a new table and categorized the response according to a bucket/theme, where each column is a new bucket. I now have 10 columns. Each response is represented in 1 or more columns. I used an excel formula to copy the response data into the column itself.
Example:
A1 // B1// C1 // D1// E1//... L1
ID // Response // Cats // Dogs // Elephants //.... Column 10
1 // I like cats // I like cats //(null)//(null)// ... (null)//
2 // I like cats and dogs // I like cats and dogs // I like cats and dogs //(null)//..//
3 // etc.
However, now I'm realizing that Access always wants to show data for all records, or at most I can limit using a WHERE clause in my query.I want to use Access to generate this report:
1. Section 1: Show all responses from the Cats bucket where there is data
2. Section 2: Show all responses from the Dogs bucket where there is data
3. and so on
I know how to do summary values, and I know how to do filtering that apply across the whole report, but this seems like more advanced filtering, where I want to see selective details differently for each field.
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Mar 5, 2015
I an trying to create a data entry form (IndividualsEntryFm) to input data for fields such as (First Name),(Birthdate) etc., these to be saved to the (IndividualsTbl)
I also have another table (NamesTbl) which has family names etc. The two tables are linked by a (MainID) field. I want a combo box on the individualsEntryFm so that I can select the family name. Then I wish the empty fields for the IndividualsTbl to be available to enter data.When I press the save button I then want this data saved, together with the MainID from the combo box to the IndividualsTbl.
I have set the IndividualsTbl with a (PersonID) field as an auto number each individual therefore has a unique PersonID but may well share the MainID. I'm trying to link many people to the same address.
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Oct 1, 2013
Background I have a query (Q1) that retrives data from a table (Table 1). One of the fields in Table (F1) contains both text and numeric data (ie: 24 eggs). I want to separate these values in Q1.
Questions
How can i in Q1 retrive only numeric data from F1 and display that data i a field?
How can i in Q1 retrive only text from F1 and display that data i a field?
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Oct 23, 2013
I have a field in a table that is comprised of mostly numerical data but some records are text.
I want to convert this field to numerical only and make a new field to put the textual data in.
However converting the field will delete the textual data. What is the easiest way to convert the field but save the textual data AND append the textual data to the SAME record that they were in originally in the new field?
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Jul 18, 2013
How can I get the value from a field in one table (in the sub form) to copy/insert into a field in another table (in the main form) when adding a new record?The main form and sub form are linked using parent/child linking, and the sub form is in a tab.I have table A (Visit Dates) in the main form which is used to record the date of a visit to a church. Table B (Quarters and Peals) is used to record an event that took place at that church during that visit. Note that not all visits in table A require a record to be created in table B - but half or more do.
In tables A and B I have a field called "QuarterOrPealID" and these are both primary keys, though the field in table B is set to 'no duplicates' and in table A it's set to 'duplicates allowed', as table A has its own auto number/pk. They are both linked in the relationships.
So, when I add a new record to table A using the main form, I might then need to click on the tab in the sub form to create a new record in table B, which has to be linked to the same record in table A. When the "QuarterOrPealID" auto number/pk is generated in the sub form (table B), I need that value to update to the "QuarterOrPealID" field of the main form (table A), so that when I'm viewing these records the form pulls all the information nicely together.
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Oct 24, 2013
I want to filter my subform data, to only show records where field A is a higher value than field B.
Code:
Me.MySubform.Form.Filter = "A > B"
Me.MySubform.Form.FilterOn = True
This way it doesn't find field B.
Code:
Me.MySubform.Form.Filter = "A > " & MySubform.Form!B
Me.MySubform.Form.FilterOn = True
This way it seems to filter all record to the field B value of the first record.
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Apr 22, 2013
I have a query called "Stock" containing field like (Item, Description, product_qty)
Another is a table called "Sales" with fields like (Sales_ID, Item, Sales_description, sales_Qty, date_Of_Sale) Item field on sales is a foreign key.
Now what i want is how can i make when the user enters new record, in field "Sales_Qty" the data entered here to be less than product_Qty.
NB; this is because you can not sell more than what you have.
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Dec 31, 2012
I have a database with a form called "Main" where users input data and then print a report from it. "Main" has fields in it from another form "Members". This data (from "Members") is shown on "Main' by Dlookup coding, and therefore cannot be selected for input by the user. Now, lets say a user inputs data into "Main" and prints the report on 12/30/2012. On the next day, a member's name is changed and I update that data in the "Members" form. On 12/31, I would like to print the report again, but it shows the updated member's name instead of what is was like on 12/30. How can I keep the old data in case I want to print the report in the future like it was initially printed? What do I need to do to any form(s), report or what VBA code needs to be written?
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Nov 3, 2012
From a table I want a text field which has a path to a file to be copied automatically into a another field of the same table with a hyperlink text type...
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Aug 22, 2014
I have a form that users will use to add new records (customers).
There is a field named VAT_Registration_no
First of all i want some code to check for duplicates in that field only,before entering the next field.If the record exists i want to show a msgbox and set focus to the vat_registration_no field. Also I want the same thing to happen if the vat_registration_no field is empty.here is what i have tried:
Private Sub VAT_registration_no_AfterUpdate()
Dim btest As Boolean
If VAT_registration_no = "" Or IsNull(Me.VAT_registration_no) Then
MsgBox "Please enter a Vat Registration No.", vbOKOnly, "error"
Me.VAT_registration_no.SetFocus
Else
btest = True
End If
End Sub
and to all other fields:
Private Sub textfield_Enter()
If Not btest Then
Me.textfield.SetFocus
End If
End Sub
If I just press enter to go straight to the second field I dont get a msg. If I write something and delete it and press enter i get the msg but when I press ok the cursor goes to the next field. I want it to go to the vat_registration_no field again. And I also want this to happen even if dont write something and then delete it.
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Jun 28, 2013
I have two tables that are joined - called A and B. A has two fields, "PLACE" and "RAND" and is joined to B via field "RAND". Other than "RAND", B has several fields named 01 TOTAL, 02 TOTAL, 03 TOTAL, etc...for about 60 fields.
The "PLACE" field in table A has data that is 01, 02, 03, ect.... How do I structure a query so that whatever "PLACE" is, I can match the XX TOTAL value? In other words, i need to have the query field header be somehow dependent on the value in "PLACE".
Is this even possible?
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Apr 1, 2014
Is there a way to remove data from one or multiple fields if the value of a separate field IsNotNull?
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