Data Type Mismatch In Criteria Expression Vb.net

Code: cmd.ExecuteReaderWhen you hit the breakpoint note that in the IDE output window the ActualCommandTextByNames function wrote the SQL to the IDE output window. Copy the SQL into notepad and look for issues in SQL formatting of the parameters. If nothing sticks out create a new query in the backend MS-Access database and run the query, look for MS-Access pointing out issues.I'm sorry but I dont fully undestand what you meant by adding a new moduleWould you please be kind enough to tell me in stepsthank youi'm still a beginner in parameter. No value given for one or more required parametersThat means your query contains a placeholder for a parameter (e.g. @d1) for which you have not supplied a value.

1. Data Type Mismatch In Criteria Expression Vb.net Free
2. System.data.oledb.oledbexception 'data Type Mismatch In Criteria Expression.' Vb.net

Access primarily throws it under two different circumstances:-1. You've genuinely got a place holer you haven't given a value for. Check all the place holders in your sql statement and make sure you've given parameter value to each of them.2. There's a word in your sql statement that Access doesn't recognise so it assumes (incorrectly) that it's a parameter. This usually happens becuase you've miss-spelled a field or table name. Check all the spellings are correct.If you're still stuck after that I'd suggest reposting your code as it currently stands (because it will have moved on from when you posted it last).

It might also be a good idea to post a screenshot of your table design in Access so we can spot any differences.Also, we're probably going to need to see the sql that's actually running. Kevin tried to explain to you how to get at that but I'm not sure you understood. Change Console.WriteLine to Debug.WriteLine (if it doesn't find that try System.Diagnostics.Debug.WriteLine). That will ensure that the query text is sent to the Output Window which you can probably see at the bottom of your screen.Finally, don't use ExecuteReader for an Insert. This isn't actually causing you a problem but it's innefficient. Use ExecuteNonQuery instead.

I think tinstaafl is on to something. What is the datatype for the CompanyID column in the Access database? Usually ID fields are auto-number integer values, but it looks like your SELECT query uses a text value in the WHERE clause (Line 9). System.Data.OleDb.OleDbException: Data type mismatch in criteria expression. What is the data type of CustomerID in the database? Is it an integer or a string? If it's an integer, get rid of the single quotes you're surrounding it with in the SQL statement.

I don't get an error in the Output WindowWe weren't trying to get the error, we were trying to get the sql.And the code you've posted now highlights exactly what I though was going on. There was more to this than you were showing us.

You showed us some code that did an insert statement along with an error that it should have been impossible for an insert statement to generate. Now you've shown your complete code and I can immediately see that there's another sql statement in your code, an update statement. An update statement could generate that error. So there's a pretty good chance we've all been trying to debug the wrong sql statement for you.OK, so now we need to be really sure which sql statement is generating the error. To do that we need to make sure your debugger will stop when it hits an error. You said previously this wan't happening so here's how to switch it on. Go to the Debug Windw and Select Exceptions.

A window will pop up with a bunch of different exceptions type. Check all of them for now. Run your code again and, when the exception is generated, the code window will appear with the offending line of code selected in yellow.

Do that and let us know whether it's happening when you execute the insert statement or when you execute the update statement.Also, I apologise if this comes across as rude but can you not private message me please. I know you want help and will be keeping an eye on this thread. Messageing me to tell me you need help is a bit like poking me in the ribs. I'm happy to help but that's going to get annoying pretty quickly. We weren't trying to get the error, we were trying to get the sql.And the code you've posted now highlights exactly what I though was going on. There was more to this than you were showing us. You showed us some code that did an insert statement along with an error that it should have been impossible for an insert statement to generate.

Now you've shown your complete code and I can immediately see that there's another sql statement in your code, an update statement. An update statement could generate that error. So there's a pretty good chance we've all been trying to debug the wrong sql statement for you.OK, so now we need to be really sure which sql statement is generating the error. To do that we need to make sure your debugger will stop when it hits an error. You said previously this wan't happening so here's how to switch it on.

Go to the Debug Windw and Select Exceptions. A window will pop up with a bunch of different exceptions type. Check all of them for now. Run your code again and, when the exception is generated, the code window will appear with the offending line of code selected in yellow. Do that and let us know whether it's happening when you execute the insert statement or when you execute the update statement.Also, I apologise if this comes across as rude but can you not private message me please. I know you want help and will be keeping an eye on this thread.

Messageing me to tell me you need help is a bit like poking me in the ribs. I'm happy to help but that's going to get annoying pretty quickly.I'm really sorry for that PM, that won't happen again I promise.well I did as you told me to and this is the code which gets highlighted in yellow. You weren't unreasonable to send it.OK, now we need you to output the sql somewhere.

I think the easiest way of doing this is to use the immediate window. Look at the tabs at the bootom of your screen, hopefully one says 'Immediate'. If it's not there go to the denug menu, then click Windows, then click immediate, that will make the tab appear.In the immediate window type?cmd.ActualCommandTextByNames. That should make the sql appear. What does it say?' Cmd' is not declared.

It may be inaccessible due to its protection level. OK there's something we haven't understood here then because cmd is declared or you couldn't issue this line of code:-cmd.ExecuteNonQueryJust to be clear on the steps:-1. Run the code in Debug Mode2. It will stop on cmd.ExecuteNonQuery and highlight it yellow3. Without stopping the debugger type?cmd.ActualCommandTextByNames into the immediate window.4. The SQL you're issueing to the database will be shown in the immediate window.I did it and I got this.'

Insert into StaffDetails(DepartmentCode,EmployeeCode,EmployeeName,LastName,Gender,BirthDate,ContactNumber,Addre ss,Email,Designation,DateEmployed,BasicSalary,Status) VALUES (','NB583',',',','25/Feb/2014 7:50:48 PM',',',','0,'1,'2,'3)'I don't get it, can you please explain this error to me??thnks. This is an Access database right? Access doesn't wrap dates in single quotes as that SQL shows them, it wraps them in # signs.The reason it is using single quotes is probably due to this:cmd.Parameters.Add(New OleDbParameter('@d6', OleDbType.VarChar, 30, 'BirthDate'))The type for that field is not VarChar, but DateTime. The same problem exists for all the fields you have that are not data type Text, so the two dates, the Currency, and the OLE Object may also be problems. A string, such as a VarChar IS wrapped in single quotes, but a date is wrapped in # and a number isn't wrapped in anything.

So, by passing in a type of VarChar for all of the parameters, you were telling the compiler to treat them all as strings and wrap them in single quotes, but that's not right for a few of the fields. I think you've tried to type what was in the immediate window into the forum. The reason I think that is that the syntax of your sql statement goes screwy towards the end (the values are appearing before hte quotes when they should be appearing inside the quotes. Don't try and type things across like that because you'll make errors and that will make it more difficult tfor us to help you. Instead Copy and Paste - that way we can be confident we're seeing exactly the same as you.Anyway, I think I can see what your problem is now. Look closely at the value you're trying to insert into the DateEmployed column.

You're trying to insert '1'. But that's a Date Column. 1 cannot be meaningfully interpretted as a date so you've got a type missmatch.Your vbcode looks correct but it's obviously doing something wrong. If I'm reading it right this line of code. Code: cmd.Parameters('@d11').Value = DateEmployedPicker.Value. Should be taking the value from a datpicker and putting it into that parameter.

Somehow, though, it's putting in a 1. Since the value of a datepicker is a date it can't be 1. That's where your problem is occuring. Is DateEmployedPicker genuinely a DatePicker? It's not, for example, a textbox you've just named as a datepicker is it? I'd suggest you put a breakpoint on that line of code and run to it.

Interrogate the value of DateEmployedPicker using the immediate window in exactly the same way as you've just done. Hopefully the problem will become clear.

This is an Access database right? Access doesn't wrap dates in single quotes as that SQL shows them, it wraps them in # signs.The reason it is using single quotes is probably due to this:cmd.Parameters.Add(New OleDbParameter('@d6', OleDbType.VarChar, 30, 'BirthDate'))The type for that field is not VarChar, but DateTime. The same problem exists for all the fields you have that are not data type Text, so the two dates, the Currency, and the OLE Object may also be problems. A string, such as a VarChar IS wrapped in single quotes, but a date is wrapped in # and a number isn't wrapped in anything.

So, by passing in a type of VarChar for all of the parameters, you were telling the compiler to treat them all as strings and wrap them in single quotes, but that's not right for a few of the fields.I re-wrote the data types. I think you've tried to type what was in the immediate window into the forum. The reason I think that is that the syntax of your sql statement goes screwy towards the end (the values are appearing before hte quotes when they should be appearing inside the quotes.

Don't try and type things across like that because you'll make errors and that will make it more difficult tfor us to help you. Instead Copy and Paste - that way we can be confident we're seeing exactly the same as you.Anyway, I think I can see what your problem is now.

Look closely at the value you're trying to insert into the DateEmployed column. You're trying to insert '1'. But that's a Date Column. 1 cannot be meaningfully interpretted as a date so you've got a type missmatch.Your vbcode looks correct but it's obviously doing something wrong. If I'm reading it right this line of code. Code: cmd.Parameters('@d11').Value = DateEmployedPicker.Value.

Should be taking the value from a datpicker and putting it into that parameter. Somehow, though, it's putting in a 1. Since the value of a datepicker is a date it can't be 1. That's where your problem is occuring. Is DateEmployedPicker genuinely a DatePicker? It's not, for example, a textbox you've just named as a datepicker is it?

I'd suggest you put a breakpoint on that line of code and run to it. Interrogate the value of DateEmployedPicker using the immediate window in exactly the same way as you've just done. Hopefully the problem will become clear.I changed the datatype as you suggested. Option Strict is a checkbox found on the Compile tab under Program Properties. By default, it is unchecked.

What Option Strict does is causes the compiler not to do any implicit conversions, which means that types that were implicitly converted to different types will then result in errors. That's a good thing for a couple of reasons:1) Implicit conversions are slower than explicit conversions, despite taking less code. This won't matter unless you are doing millions of them.2) Implicit conversions aren't always right.

Sometimes the conversion does something you really didn't expect and results in a bug. Therefore, implicit conversions can hide bugs, and pretty hard to trace bugs, at that.3) The last point is that with Option Strict ON, you will simply be a better coder because you will be forced to understand your processes better than you had before.For these reasons, Option Strict is a really good idea, though turning it on halfway through a large project will surely result in plenty of frustration as you find possibly hundreds of implicit conversions that are now compiler errors. Fixing them is worth the effort, though, because even if they did work, they didn't work all that well.As for the main problem: You have found one of the greatest annoyances of working against a database.

You build up the SQL then run it. Rather than getting an error that tells you exactly what item is wrong, you may well get an error that simply tells you 'something' is wrong without specifying very clearly what it is. Furthermore, the error will be at the point you execute the SQL, never at the point where you built something incorrect into the SQL. What's worse, is that you may have several errors in the SQL such that you can fix the one that is giving the current error, but you immediately run into another that gives the exact same error.

It would look as if you hadn't made any progress at all when, in fact, you had.There are no shortcuts to this. You just have to work through it piece by piece, and nobody can do it fundamentally any better than you can. All we do is pore over the data and look for things that don't look right, which is all you are doing, too.

You HAVE made progress, though, despite the fact that it is still not working at the moment.If the current exception is the one about no value given, the first thing I would do would be to put a breakpoint on this line:cmd.Parameters('@d1').Value = DepartmentCodeTextBox2.TextWhen execution stops on that line, take a look at what is in DepartmentCodeTextBox2.Text to see that it is what you expect.By the way, there is a different way to write parameters that is easier. In your case, you added a bunch of parameters, then set their values. You can do that in one step and would find it easier.

Instead of both. Code: cmd.Parameters.Add(New OleDbParameter('@d1', OleDbType.VarChar, 6, 'DepartmentCode'))cmd.Parameters('@d1').Value = DepartmentCodeTextBox2.TextYou could just write:cmd.Parameters.AddWithValue('@d1',DepartmentCodeTextBox2.Text)You don't even need the type and the length in that case. I think you would agree that one simpler line is easier than multiple lines. There would be an advantage to doing it the way you are doing it if you were retaining and re-using the cmd object, but you are not (and I agree with that decision), so the AddWithValue is easier. FormatExceptionOccurredThat's because of what I told you in post 25. The value your trying to pass into the Date Employed field is 1 but Date Employed needs to be a date. 1 is not a date.You're getting a different error to the one you had previously because this is now being caught when you assign the value to the ADO parameter wheras it was previously getting caught when you actually executed the sql.

Never the less, it's exactly the same problem.If the code you posted in post 17 is correct then this line of code. Option Strict is a checkbox found on the Compile tab under Program Properties. By default, it is unchecked. What Option Strict does is causes the compiler not to do any implicit conversions, which means that types that were implicitly converted to different types will then result in errors. That's a good thing for a couple of reasons:1) Implicit conversions are slower than explicit conversions, despite taking less code.

Data Type Mismatch In Criteria Expression Vb.net Free

This won't matter unless you are doing millions of them.2) Implicit conversions aren't always right. Sometimes the conversion does something you really didn't expect and results in a bug. Therefore, implicit conversions can hide bugs, and pretty hard to trace bugs, at that.3) The last point is that with Option Strict ON, you will simply be a better coder because you will be forced to understand your processes better than you had before.For these reasons, Option Strict is a really good idea, though turning it on halfway through a large project will surely result in plenty of frustration as you find possibly hundreds of implicit conversions that are now compiler errors. Fixing them is worth the effort, though, because even if they did work, they didn't work all that well.As for the main problem: You have found one of the greatest annoyances of working against a database. You build up the SQL then run it. Rather than getting an error that tells you exactly what item is wrong, you may well get an error that simply tells you 'something' is wrong without specifying very clearly what it is.

Furthermore, the error will be at the point you execute the SQL, never at the point where you built something incorrect into the SQL. What's worse, is that you may have several errors in the SQL such that you can fix the one that is giving the current error, but you immediately run into another that gives the exact same error. It would look as if you hadn't made any progress at all when, in fact, you had.There are no shortcuts to this. You just have to work through it piece by piece, and nobody can do it fundamentally any better than you can. All we do is pore over the data and look for things that don't look right, which is all you are doing, too. You HAVE made progress, though, despite the fact that it is still not working at the moment.If the current exception is the one about no value given, the first thing I would do would be to put a breakpoint on this line:cmd.Parameters('@d1').Value = DepartmentCodeTextBox2.TextWhen execution stops on that line, take a look at what is in DepartmentCodeTextBox2.Text to see that it is what you expect.By the way, there is a different way to write parameters that is easier. In your case, you added a bunch of parameters, then set their values.

You can do that in one step and would find it easier. Instead of both. Code: cmd.Parameters.Add(New OleDbParameter('@d1', OleDbType.VarChar, 6, 'DepartmentCode'))cmd.Parameters('@d1').Value = DepartmentCodeTextBox2.TextYou could just write:cmd.Parameters.AddWithValue('@d1',DepartmentCodeTextBox2.Text)You don't even need the type and the length in that case. I think you would agree that one simpler line is easier than multiple lines.

There would be an advantage to doing it the way you are doing it if you were retaining and re-using the cmd object, but you are not (and I agree with that decision), so the AddWithValue is easier.Thanks a lot for explaining me about the Option Strict. I tried it but only two errors displayed and I fixed both of them.I made a breakpoint in the departmentCode and I got this errorno value given for parameter '@d1'can you please tell me what I should do?thank you!!! Code: cmd.Parameters('@d11').Value = DateEmployedPicker.Value Is where you're getting that value from. That looks like DateEmployedPicker is a DatePicker but I can tell it's not because a DatePicker.Value would return you a date, not a string containing a number. What is DateEmployedPicker?DateEmployed field is a DatePicker, see post #17 and look at the form where the Date Employed field is.DateEmployed is same as the BirthDate field.so what should do?? Do you want me to delete the DateEmployedDatePicker filed and make a new one??what about if I give you my project via a download link so that you could clearly see what the errors arethanks.

Code: SELECT Identifier FROM Customer WHERE Identifier = @IdentifierSELECT Identifier FROM Customer WHERE Identifier = 1The second SELECT would be the one to examine. There is zero C# code here. I don't think I could rewrite the whole thing again because I have no idea of that coding you showed me just now.And if i write that, I think I might still get the same errors.Just so you know, I am still a beginner to this and I don't have any tutors or teachers to explain me about this visual basic. I had to learn all this by myself in order to complete my advanced level.so, isn't their any other alternative methods???

I made a breakpoint in the departmentCode and I got this errorno value given for parameter '@d1'I think you put the breakpoint in the code at a point before you'd set the parameter. If you issued cmd.ActualCommandTextByNames in the immediate window before you set the parameter value you would get that error because you hadn't set the parameter value yet.At this point though, I don't think any of us are going to be able to help you with this project short of doing the work for you (and we're extremely unlikely to do that). The reason we can't help you is that you're trying to write code before you've even understood the way the development environment works. You need to be able to interrogate the value on variables watches and the immediate window. You need to be able to walkthrough your code using breakpoints and debug mode. And most of all, you need at least a basic understanding of what the existing code is doing before you attempt to debug it. At present you have none of those things.I'm sorry if that sounds nasty, I really don't mean it to.

I understand your frustration and sympathise with you. We were all beginners once and it can be hard. But, unfortunately, sympathy isn't going to help.

What you need to do is go through some beginners tutorials. There are plenty available on line and they will give you the skills you need. But you'll have to spend the time and effort to go through them.

System.data.oledb.oledbexception 'data Type Mismatch In Criteria Expression.' Vb.net

Asking questions on here isn't going to work, though, because at the moment you don't even know what questions to ask, what information we'll need to give an answer or what the answer means when we give it.I sincerely wish you all the best. →.new.Get practical advice and learn best practices for moving your applications from RDBMS to the Couchbase Engagement Database. (sponsored).

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