Data Type Mismatch In Criteria Expression Vb.net
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When I run the program there's an error in cmd.ExecuteReader(). Data type mismatch in criteria expression please help how to fix this error.
Data Type Mismatch In Criteria Expression Vb.net Word
access-l Data type mismatch in criteria expression when building a select query I have built and been using a very simple query with the criteria to filter data 'Between #1/1/2008# And ##'. As it stands the query has worked great for a year now. I am trying to change this to reflect data for 2009. I'm currently developing a queuing system, when I executed my program a message box appeared that said 'Data Type Mismatch in criteria expression'. I don't have any idea what that expression means. The code below is the last line of codes I modified before the message appeared. Can anyone help me out?
If you just changed the Default Value for a field in a table and see a message about data type mismatch when you try to enter new records, open the table in Design view and make sure the expression you use for the field's Default Value evaluates as the same data type as the field.
2 Answers
In your query you pass two strings for the TN_ID and Password fields.
Probably the TN_ID is a numeric field and you don't need to put quotation marks around it and I find really strange that you pass the value of a UserName textbox.
Said that, I wish to examine your query because there are potential problems that you have not seen:
First of all PASSWORD is a reserved Keyword and thus you need to use Square Brackets around it.
Second, do not use string concatenation to build sql commands but use a parameterized query like this
As a side note, not related to your problem, consider also to NOT store password in plain text in the database. There are techniques that HASH the password text and store the result in the database. In this way none can get the password simply looking at the database file. See the details in this question
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Data Type Mismatch In Criteria Expression Vb.net C
I used 2 buttonradio to select criteria of search , I have problem with date search, Data type mismatch in criteria expression.
Data Type Mismatch In Criteria Expression Vb.net Free
2 Answers
Expanding on Plutonix comment to your question you can try:
In this way ADO.NET will take care for you to replace the question mark in the query text with the proper date value formatted as required by OleDb syntax. You entirely avoid string concatenation errors and you don't need to learn any formatting rule for all available OleDb data types.
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Besides it should be safer.
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