Hey Everyone, I am writing some code that makes use of SQL Server CE 3.5 and I am having a very strange problem. I have a string field in one of the tables that needs to store a full file path.
Over the course of trying to fix this problem I have that field set as nvarchar with a max size of 4000, but it is still cutting longer strings that are much shorter than the limit off
for example:
D:\iTunes\iTunes Media\Music\Abigail Williams\In The Absence Of Light\02 Final Destiny Of The Gods.m
This is clearly smaller than 4000 characters, yet it is missing the p3 at the end of the string.
I am using a table adapter to enter the data into the database with the following query:
INSERT INTO [Track] ([Artist_ID], [Album_ID], [FilePath], [LastUpdate])
VALUES (#Art, #Al, #Fp, #LU)
I know that the strings are fully formed on insert because I am using the following code to check:
if(!temp.Filepath.EndsWith(".mp3"))
MessageBox.Show("File Error");
this.trackTableAdapter1.InsertQuery(ArtID, AlID, temp.Filepath, File.GetLastWriteTime(temp.Filepath));
The message box does not get shown, so the string must end correctly on insert.
the query that extracts the data is:
SELECT
*
FROM Track
WHERE Artist_ID=#Artist_ID AND Album_ID=#Album_ID
The involved code is:
foreach (Database.MusicDBDataSet.TrackRow TR in this.trackTableAdapter1.GetAlbumTracks(AR.Artist_ID, AlR.Album_ID).Rows)
{
//if (!TR.FilePath.EndsWith(".mp3"))
//MessageBox.Show("File Path Error");
this.ArtistList[AR.Name].AlbumList[this.ArtistList[AR.Name].AlbumList.Count - 1].TrackList.Add(new Track(TR.FilePath, AlR.Name, AR.Name));
}
Has anyone ever run into this problem before?
Check the XSD file. Specifically, check the FilePath column of your table and look for the max length.
Maybe take a look at the SQLServerCE Parameter Size limitation.
What is the specific maximum length? Is it around 100 chars? (Guessing based on your provided input example).
The 100 unicode chars also matches with D.K. Mulligan's answer. Looking at SQL ServerCE Paramater Size Property
For variable-length data types, the Size property describes the maximum amount of data to send to the server. For example, the Size property can be used to limit the amount of data sent to the server for a string value to the first 100 bytes.
For Unicode string data, the Size property refers to the number of characters. The count for strings does not include the terminating character.
Try bumping the size to see if this is the magic number that is truncating your strings.
Related
I have this text to get from juicer api <p>test message ✈️</p> when save this text in sql database so icon in this text is replace to ?? double question mark i dont know why how can i fixed this issue, because i want to display this text with in my application news feed area.
Pleae help me how can i fixed this issue.
#PrateekShrivastava MSSQL message column type is text
Please check: https://learn.microsoft.com/en-us/sql/t-sql/data-types/ntext-text-and-image-transact-sql?view=sql-server-ver15
text
Variable-length non-Unicode data in the code page of the server and with a maximum string length of 2^31-1 (2,147,483,647). When the server code page uses double-byte characters, the storage is still 2,147,483,647 bytes. Depending on the character string, the storage size may be less than 2,147,483,647 bytes.
Change column to nvarchar(MAX) or ntext
I have to make a method that exports database data to a file. The software that will process this file requires specific string length - no more, no less. The data that comes in will have less than the required number of characters, but I have to make the length of every column fit that number exactly by addind whitespaces.
Does anyone have an idea how to do this in the most efficient way? The datasets won't be small and the only thing that comes to mind is looping over every table cell, checking the length and then adding up to the required length...
I'm using the code
cmd.Parameters.Add("#Array", SqlDbType.VarBinary).Value = Array;
The SqlDbType.VarBinary description states that it can only handle array's upto 8 K bytes. I have a byte array that represents an image and can go upto 10k bytes.
How do I store that in a varbinary(max) column using C#?
I have no trouble creating the array. I'm stuck at this 8k limit when trying to execute the query.
Edit: Let me clarify, on my machine even pictures upto 15k bytes get stored on the database in the varbinary(MAX) column when I run the asp.net application locally but once I deployed it the pictures would not get stored. I then resorted to drastically resizing the images to ensure their size was less that 8K and now the images get stored without any problem.
Perhaps you could look at the Sql Server FILESTREAM feature since its meant for storing files. It basically stores a pointer to your file and the file is stored directly in the filesystem (in the databases data directory).
I like FILESTREAM since you it means you continue to use the interface to the database (SQLClient for example) rather then breaking out to an adhoc method to read/write files to the harddrive. This means security is managed for you in that your app doesn't need special permissions to access the filesystem.
Quick google gave this acticle on using filestream in c# but I'm sure there are many others.
UPDATE following OP EDIT
So once deployed to other server the upload fails? Perhaps the problem is not the sql insert but that there is a http request content length limit imposed - for example in your web.config the httpRuntime element has the maxRequestLength attribute. If this is set to a low value perhaps this is the problem. So you could set to something like this (sets max to 6MB well over the 10kb problem):
<system.web>
<httpRuntime maxRequestLength="6144" />
The only thing here is the limit it 4MB buy default :|
No, this is what the description actually says:
Array of type Byte. A variable-length stream of binary data ranging
between 1 and 8,000 bytes. Implicit conversion fails if the byte array
is greater than 8,000 bytes. Explicitly set the object when working
with byte arrays larger than 8,000 bytes.
I would assume that what that actually means is that you cannot use AddWithValue to have a parameter infer the type as VarBinary if the byte array is over 8000 elements. You would have to use Add, specify the type of the parameter yourself and then set the Value property, i.e. use this:
command.Parameters.Add("#MyColumn", SqlDbType.VarBinary).Value = myByteArray;
rather than this:
command.Parameters.AddWithValue("#MyColumn", myByteArray);
Adding the length of data seems to be the fix
var dataParam = cmd.Parameters.AddWithValue("#Data", (object)data.Data ?? DBNull.Value);
if (data.Data != null)
{
dataParam.SqlDbType = SqlDbType.VarBinary;
dataParam.Size = data.Data.Length;
}
Where I work, we have two systems that use SAP, one using Delphi and another using c#. I'm implementing the c# and both have the same problem, when I query for a great amount of columns using RFC_READ_TABLE, depending on the table ( usually 60+ ), it returns a Rfcabapexception with no description and no Inner Exception, just a title. What is causing this exception and what can I do to prevent it?
The function module RFC_READ_TABLE has to convert the data to a generic format because "really generic types" like DATA or STANDARD TABLE are not supported for RFC communication. Because of this, the outout is transmitted as a series of table lines, each a character field up to 512 characters in length.
This has several consequences:
If the total size of all fields you requested exceeds 512 characters, you will get a short dump (check with transaction ST22) and the exception you mentioned.
If you try to read fields that can not be converted to character fields and/or do hot have a fixed-length (!) character representation, bad things will happen. Most likely, RFC_READ_TABLE will either abort with a short dump or barf all over your output data.
You can bypass the first problem by slicing the table vertically and reading groups of columns sequentially. Be aware that RFC_READ_TABLE is not guaranteed to always return the data in the same order when stitching the results back together again. Also be aware that you might run into violations of transaction isolation, depending on how often the data you read changes.
i am trying to store large data more than 255 characters in a string datatype but it truncates after 255. how can i achive this basically i need to pass this data to database
C# strings do not have any particular character limit. However the database column you are writing to may have a limit. If you are storing large amounts of data, you should use a BLOB column instead of an ordinary varchar type.
StringBuilder class
Like they said the string class is not limited, but you can do this for large strings. I feel it handles them better.
StringBuilder sb = new StringBuilder();
sb.append("Some text...");
sb.append("more text...");
sb.append("even more text!");
sb.toString();
Okay, it sounds like you have several different technologies involved - Excel, XML, databases etc. Try to tackle just one at a time. First read the data out of Excel, and make sure you can do that without any truncation.
Write a small console app which will read the value, then write it to the console - and its length. If that works, you know the problem isn't in Excel.
Next you can write a small console app with hardcoded input data (so you don't need to keep using interop with Excel) and write the XML from that, or whatever your next stage is.
Basically, take the one big problem ("when I read data from Excel and write it to the database it truncates long values") and split it into smaller and smaller ones until you've found what's wrong.
The string type does not limit strings to 255 characters. Your database column must be 255 characters.
I know that c# strings can hold much longer data than that. If the truncation occurs on commiting to DB, check the length constraint on ur Db field
The problem lies in the Excel part; .Character has a 255 characters limitation.
To read the complete text from a shape the following VBA syntax would do:
Worksheets("YourSheet").Shapes("Shape1").OLEFormat.Object.Text