Im getting a "An error occurred while attempting to perform a type cast" when using a derived column to format some error information. My Expression is a follows
(DT_STR,255,1252)("Insert Employee Error - EmployeeID:" + (DT_STR,255,1252)ID)
The ID column is an integer. Strangely enough i'm doing something similar in another package and this works fine. any ideas?
Heres my meta data passed to the derived column
I don't have any VMs handy for 2005 if that's your environment but the derived column transformation played looser with data types than 2008 so my test scenario, 2008 R2, ought to be valid regardless.
I see nothing wrong with your expression there. I spun up a quick package to verify your expectation that it works and it works for me.
Added a row with null value based on Siva's comment but does not appear to be the source of the OP's problem
A few things to check on the metadata preceding the derived column transformation
Is the casing of the column ID really ID?
Is the data type really 4 byte signed int? (DT_I4)
Try wrapping the ID column with [ID] or remove the ID completely and re-drag it from the Columns list
Related
I try to use ssis fuzzy grouping to identify duplicates. The package is simple
The data source is sql server 2016 and
When I run the package I got the following error message:
[Fuzzy Grouping Inner Data Flow : Fuzzy Lookup [49]] Error: The fuzzy
lookup specified between input column "Column1" and reference column
"[Column1]" is not valid because fuzzy joins are only supported
between string columns, types DT_STR and DT_WSTR.
I inserted to change the data types but I got same error.
Can anyone help ? Thanks in advance
I think you are still not using derived column1 as a source column ,use derived column1 this instead of Adress1_Line1 in destination mapping.
You can also use Data Conversion Task instead of derived column,please check after using data conversion task.
I hope you will not get error.
Step 1. I use select cast(coalesce([Address1_Line1], '') as nvarchar (4000)) as address1 from [TableName] in OLE DB source.
Got the following error message: "The size (4002) given to the parameter 'Column0' exceeds the maximum allowed (4000).".
Step 2. alter table TableName alter column Address1_Line1 nvarchar (1000)
and the package runs successful without derived column or data conversion task.
The issue is nvarchar(4000) is different than SSIS maximum allowed 4000 Bites
I'm using SSIS to separate good data from unusable date. In order to do that I used derived columns, script task and conditional split where I assigned certain conditions. One of the conditions I need to apply is that none of the numbers in one column cannot be negative. I'm guessing that the best way to solve this would be using conditional split, but I cannot get it to work. I'm new to SSIS, so any help would be appreciated.
You'd have an Expression like
[MyCaseSensitiveColumnName] < 0
and then name the output path something like BadData_NegativeValue
From the comments
that is what I did before, but I'm getting an error saying that The data types "DT_WSTR" and "DT_I4" are incompatible for binary operator ">"
That error message indicates that you are attempting to compare a unicode string (DT_WSTR) and an integer (DT_I4) and that the expression language does not allow it.
To resolve this type incompatibility, you would need to first convert the value of MyCaseSensitiveColumnName from DT_WSTR to an integer.
I'd likely add a Derived Column Component to my data flow and create a new column called MyCaseSensitiveColumnNameAsInteger with an expression like
(DT_I4) [MyCaseSensitiveColumnName]
Now, that may be perilous depending on the quality of your source data. I don't know why you are pulling numeric data in as a string. If there could be non whole numbers in the data set, then we will need to check before making the cast. If there are NULLs in that dataset, those too may cause issues.
That would result in our conditional split check becoming
[MyCaseSensitiveColumnNameAsInteger] < 0
I'm using the "ASC" function in Access (Version 365 Proplus, 32 bit).
Have created a query that uses a table with a post code that needs validating. I'm looking at the first character in the postcode, converting it to ASCII character then planning on filtering out the ones I don't want.
The formula looks like this:-
Site_PostCode_String_Validation_P1: Asc(Left([site_postcode],1))
This works fine and converts as expected. However, when I try sorting or filtering using the Query Criteria on my Ascii list I get the following message:-
"Data Type Mismatch in Criteria Expression"
I have tried converting to a string, for example, using the below:-
Str(Asc(Left([site_postcode],1)))
But this has made no difference, get the same error message when applying criteria or sorting.
I have tried filtering using text and numbers but get the same error.
I have searched here and have Googled but can not see anything relating to the above.
Thanks for any suggestions.
You might simplify it a bit:
Site_PostCode_String_Validation_P1: Asc(Nz([site_postcode], Chr(0))
I tried creating a new table based on the results, thinking that this would then enable me to apply my filtering, during this process I got a more detailed error message stating error due to Null type conversion failure. So then realized that I need to make sure there were no Null entries before doing the ascii conversion. Hopefully this will be of help to someone else. Final formula now works as below:
IIf(IsNull([site_postcode])=-1,Null,Asc(Left([site_postcode],1)))
I have a source flat file with values such as 24.209991, but they need to load to SQL Server as type money. In the DTS (which I am converting from), that value comes across as 24.21. How do I convert that field in SSIS?
Right now, I am just changing the type from DT_STR to DT_CY, and it gives a run error of 'Data conversion failed. The data conversion for column "Col003" returned status value 2 and status text "The value could not be converted because of a potential loss of data.".'
Do I use a Data Conversion task? And then what?
I've also tried setting the source output column to DT_NUMERIC, and then convert that to DT_CY, with the same result.
I've also tried using Derived Columns, casting the DT_STR field Col003 to (DT_NUMERIC,10,2)Col003 and then casting that to (DT_CY)Col003_Numeric. That's getting a cast error.
The flat file defaults to all fields being DT_STR. Use the Advanced option on editing the connection to have the numeric field as float (DT_R4). Then, in the advanced editing of the Flat File Source (on the Data Flow tab), set that output column to money (DT_CY).
Then, the field will convert without any additional conversions. The issue was leaving the source file definition as DT_STR.
If you don't have any null value use Data Conversion, and make sure you don't have any funny character (e.g. US$200 produce error)
If you have null or empty fields in your field and you are using Flat file source, make sure that you tick "Return null value from source.."
Another trick I have used is something like: (taxvalue != "" ? taxvalue : NULL(DT_WSTR,50)). in Derived Column transformation (you can just replace the field)
Generally SSIS doesn't convert empty strings to money properly.
For some reason in my scenario, the OLE DB Destination actually was configured to accept a DT_CY. However, casting to this format (no matter the length of the input and destination data, and no matter wether or not the data was NULL when it arrived) always caused the same issue.
After adding data viewers, I can conclude that this has something to do with the locale. Here in Denmark, we use comma (,) as decimal delimiters and dots (.) as thousands-delimiters, instead of the opposite.
This means that a huge number like 382,939,291,293.38 would (after the conversion to DT_CY) look like 382.939.291.293,38. Even though I highly doubted that it could be the issue, I decided to do the opposite of what I originally had intended.
I decided to go to the advanced settings of my OLE DB Destination and change the DT_CY column's type to DT_STR instead. Then, I added a Derived Column transformation, and entered the following expression to transform the column before the data would arrive at the destination.
REPLACE(SUBSTRING(Price, 2, 18), ",", ".") where Price was the column's name.
To my big surprise, this solved the problem, since I figured out that my OLE DB Destination was now sending the data as a string, which the SQL Server understood perfectly fine.
I am certain that this is a bug! I was using SQL Server 2008, so it might have been solved in later editions. However, I find it quite critical that such an essential thing is not working correctly!
So I am currently working on a migration from an old Advantage database server to SQL 2005 using SSIS 2008. One of the columns in the old Advantage database is a MEMO type. By default this translates to a DT_TEXT column. Well in the new database I do not need this large of field, but can limit it to something such as VARCHAR(50). I successfully set up a derived column transformation to convert this with the following expression:
(DT_STR,50,1252)[ColumnName]
Now I want to go a step further and replace all NULL values with an empty string. This would seem easy enough using an ISNULL([ColumnName])?"":(DT_STR,50,1252)[ColumnName] expression, but the problem is that the OLE DB Destination contains the following error
Cannot convert between unicode and non-unicode strings...
So apparently the whole ISNULL expression converts the data type to Unicode string [DT-WSTR]. I have tried a variety of casts upon the whole expression or different parts, but I cannot get the data type to match what I need it.
First, is it possible to convert the DT_TEXT type directly to unicode? From what I can tell, the casts don't work that way. If not, is there a way to get an expression to work so that NULL values get converted to empty strings?
Thank you for all your help!
Give this a try in your derived column.
(DT_STR,50,1252) (ISNULL(ColumnName) ? "" : (DT_STR,50,1252) ColumnName)
It includes an additional type cast with the Conditional (?:) in parentheses to ensure the desired processing sequence. I think your original expression was implicitly casting to DT_WSTR because the "" defaults to DT_WSTR. With this new version, you force the cast to DT_STR after the expression is evaluated.
I figured something out that works. It may not be the best solution, but it will work for my situation.
From my OLE DB source I first did a Derived Column. This I used the ISNULL which ended up converting it to a DT_WSTR unicode type. although I could not get any casts to get it back to the type required, I then added a Data Conversion transformation in-between the Derived Column and the OLE DB Destination. This would take the input string and convert it back to a DT_STR. This all feels a little annoying converting so many times, but the column does not contain any funky information that I should have to worry about, so I suppose it will work.
Thanks for all those who pondered the solution, and if you find some awesome way to tackle it, I would be more than interested.