I have a String field in a Dataset in (mmddyyyy) format.
I am trying to convert it into a Date field in SSRS.
I already tried using the below command but I am getting error.
CDate(Fields!LocalTXNDate.Value)
Can anyone please suggest.
While Larnu is correct, the way to do it is to correct the database, sometimes we lowly report makers have no say in making these changes - much less getting a DBA to do it in a reasonable amount of time.
If you can't change the data to be correct, the easiest way to convert and use the field as a date is to add a Calculated Field to the Dataset. Open the dataset properties, click on the Fields tab, Add a Calculated field.
For the Expression, use string functions to parse the field into a generic date format and then CDATE to convert to a date type. Then use the new field for dates. You could also use this in your text box if it's not being reused but it's easier to manipulate the Calculated field.
=CDATE(
RIGHT(Fields!LocalTXNDate.Value, 4) & "-" &
LEFT(Fields!LocalTXNDate.Value, 2) & "-" &
MID(Fields!LocalTXNDate.Value, 3, 2)
)
The problem here isn't SSRS but your data, and that you are using a string based data type to store the data. You need to fix the problem at the source, not at the report level.
The string format you have chosen, MMddyyyy isn't a format that is recognised by default in any of the languages in SQL Server, nor if you explicitly use SET DATEFORMAT, nor does it appear as a style. SET DATEFORMAT MDY; SELECT CONVERT(date,'11172022'); will fail. Therefore you'll need to first do some string manipulation on the data first to be an unambiguous format (yyyyMMdd):
UPDATE YT
SET YourDateColumn = CONVERT(varchar(8),V.DateValue,112)
FROM dbo.YourTable YT
CROSS APPLY (VALUES(TRY_CONVERT(date,CONCAT(RIGHT(YT.YourDateColumn,4),LEFT(YT.YourDateColumn,4)))))V(DateValue);
For any bad values you have, such as '17112022' this will UPDATE the value to NULL; as such you may want to create a new column for the new value, or perhaps a new column to store the value of dates that couldn't be converted.
After you've changed the value to an unambiguous format, then you can ALTER the column:
ALTER TABLe dbo.YourTable ALTER COLUMN YourDateColumn date NULL;
Note that if you have any constraints, you will need to DROP those first, and then reCREATE them afterwards.
Now that the data type of the column is correct, you need not do anything in SSRS, as the data type is correct.
Related
The following instruction aims at using a specific format to import DATEs
alter session set DATE_INPUT_FORMAT = 'YYYY-MM-DD HH24:MI:SS.FF';
However, it seems to have no effect on the following:
copy into schema.table
from s3://bucket/file.parquet
credentials=(aws_key_id='...' aws_secret_key='...')
match_by_column_name=case_insensitive
file_format=(type=parquet);
Which results in errors like below:
sqlalchemy.exc.ProgrammingError: (snowflake.connector.errors.ProgrammingError) 100071 (22000):
Failed to cast variant value "2020-06-16 00:00:00.000" to DATE
When a column in the imported Parquet file has a format as specified above for a date field.
This really sounds like a bug, as the above COPY INTO scenario should in theory be a typical use case for altering the DATE_INPUT_FORMAT.
Is there a way to address this?
The DATE_INPUT_FORMAT should affect the copy command. The documentation talks about not supporting a timestamp from a variant column on a date conversion.
Although TO_DATE accepts a TIMESTAMP value, it does not accept a TIMESTAMP inside a VARIANT.
I have a datatable in which I have datetime column, in Database DateTime is set as null so it fills with default datetime. Now when I view this datatable in WPF it shows me these dates. Where as I want to make it empty if date is less than 2000-01-01.
foreach (DataRow row in table.Rows)
{
if (row["PROCESSED__DATE"].ToString() != "")
{
string s = Convert.ToDateTime(row["PROCESSED__DATE"].ToString()).ToString("MM/dd/yyyy HH:mm:ss");
if (DateTime.ParseExact(s, "MM/dd/yyyy HH:mm:ss", System.Globalization.CultureInfo.InvariantCulture)<
DateTime.ParseExact("01/01/2000 00:00:00", "MM/dd/yyyy
HH:mm:ss",System.Globalization.CultureInfo.InvariantCulture
{
row["PROCESSED__DATE"] = "";
}
}
}
I am using this following code to replace datetime column value to empty but I am getting an error on the following line:
row["PROCESSED__DATE"] = "";
The error is String was not recognized as a valid DateTime.Couldn't store, I know this is causing because I am trying to save empty string in DATETIME column. But what I don't know is how can I achieve this without changing datacolumn datatype.
I don't really came up with your code but i'll give you leads to find a solution.
What is your database engine, in almost all you can define the column as Nullable, which mean you will be able to set no value. When you go to find the value you have to use somethig like the FirstOrDefault so if there is no value it is null otherway you get the value
Let's imagine you don't like the first solution, you are using a datatable, not bad but if you want to do a little more and have much more possibilities try using DataGrid, not much complicated, you just need to make something that contains the data and go for the binding magic. With this solution you can do much more and with the Object you'll be able to handle many future potential problems.
If you have any further questions ask it, i'll try the best to help you.
Hoping my answer will help you.
Have a nice day.
Dates are not stored with time zone or format information in the database, it is simply stored as two integers which represent an offset from a zero date.
Your code converts a column that you say is a DateTime to a string and then converts this back to a DateTime and then back to a string again.
string s = Convert.ToDateTime(row["PROCESSED__DATE"].ToString()).ToString("MM/dd/yyyy HH:mm:ss");
This is a pointless exercise, just use the date in its native format and if you want to compare use the DateTime data type.
Additionally, if you can't make the column nullable in the database, then you might want to consider using a constant to represent the empty date.
You can create a date using the date constructors without parsing it from a string.
var baseDate = new Date time(1, 1, 2000);
if (row["PROCESSED__DATE"] < baseDate) { // ... Etc
But still, you aren't going to be able to push anything but a date into the database unless you make the column nullable.
Can you not change the schema to make the column nullable?
I'm using LINQ-to-SQL and need to order by a date field. The date field is stored as text and could have anything in it since it is user entered data. I need to handle cases where an invalid date was placed in there.
For example, a date of "02/23/0000" returns:
The conversion of a varchar data type to a datetime data type resulted in an out-of-range value.
I need to avoid errors and I don't care where an invalid date like this gets sorted to. The parameters of the project mean I can't modify my source data, only read from it.
Here is an example LINQ statement.
from x in dbo_myTable
orderby Convert.ToDateTime(x.MyDateField)
select x
Do you definitely need to perform the ordering in the database? In this situation I would strongly consider pulling all of the data, then performing some conversion in .NET code where you have a great deal more control over what's going on, and then order it still in .NET code.
Ultimately, dealing with screwed up data in this sort of situation is tricky - the more control you have, the better.
You can do something like this (Based on your comment that they are all 10 characters)
from x in dbo_myTable
orderby x.MyDateField.Substring(6, 4), x.MyDateField.Substring(0, 2), x.MyDateField.Substring(3, 2)
select x
First is first; why cant you change the database to fix you obviously brokes table structure? Why cant you sanitize input when its going into the database? Why are you not validating user input?
Now for the answer; your only option is attempt to parse the date (with DateTime.TryParse or DateTime.TryParseExact) and set a default value of your choosing if it fails to parse:
from x in dbo_myTable
orderby TryConvertToDateTime(x.MyDateField)
select x
private DateTime TryConvertToDateTime(string dt)
{
DateTime rtn = DateTime.MinValue; // or whatever you want your default to be
DateTime.TryParse(dt,out rtn);
return rtn;
}
I have a 'text' type in a SQL table (BigNote), and a new nvarchar(2000) field (LittleNote).
I need to save the first 2000 characters from the #BigNote into the LittleNote field within a stored procedure. Can someone share some thoughts?
Do I need to check for:
- nulls?
- the BigNote length and only grab the exact amount?
It is working by just assigning LittleNote = #BigNote, but I want to avoid problems when the text is too big etc...
Once we release an update to the application, we will handle this more elegantly, but in the meantime we need to get a non-Text field with this data in the database.
you could use
LittleNote = CONVERT(NVARCHAR(2000), #BigNote)
or with SUBSTRING
LittleNote = SUBSTRING(#BigNote, 1, 2000)
Is there any way to check Date(like isDate function in TSQL) column in SSIS package derived column expression after extraction from Sourcefile before loading to target dtabase?
Thanks
there is no built in function but you can run a script task and use vb.net code to check if the column is a date and operate on it as you wish...
I had a similar issue. I had a date/time in a text file, but the field had a dash between the date and the time. I created a derived column to do a replace on the dash:
REPLACE([TimeField], "- ", "")
I then added a convert column to convert the field to a date. I chose to ignore errors. I then added another Derived Column to check if the converted field was NULL, indicating that it could not convert the value. If it was, I had it set to the current date.
There is a a data conversion task you can drop in. Then redirect the rows as needed, either failing the import entirely or redircting the rows that don't work.
Or you could try a conditional split wher eyou cast the field to a date data type and then send the failures along another path (either deleting the records or nulling out the field would be the common action.)
See also http://www.sqlis.com/sqlis/post/Expression-Date-Functions.aspx > "IsDate workaround" for a technique that can be adapted
You can check whether your variable has a date or not using a conditional statement like this:
testDateVariable?true:false
For example, if date > 2 then it is true (and put the date, or format the date as you wish). If it is false, put null (you replace true with the date format and false with null).
All this is in a drived column in SSIS.