I am trying to save data into my database using a vb form. I am using a datetimepicker to insert the date into my database. Here's an example
saveCommand.Parameters.AddWithValue("A_BOOKDATE", abookdatePicker1.Text).DbType = DbType.DateTime
In my database i set its attribute to time ,now the thing is i used the same line of code on another database and it worked but this one is giving this error
'Failed to convert parameter value from string to datetime'
How do i convert this string to datetime.
Many Thanks
Use DateTimePicker.Value instead of DateTimePicker.Text:
saveCommand.Parameters.AddWithValue("A_BOOKDATE", abookdatePicker1.Value) _
.DbType = DbType.DateTime
(If you ever actually have to convert a string to a DateTime, use DateTime.TryParseExact or DateTime.ParseExact, but in this case it's better not to use the string representation at all.)
You could also try to use
Convert.ToDateTime Method (String) (this one will return a datatime object or throw and exception)
DateTime.TryParse Method (String, DateTime) (this one returns the datetime as an output parameter, returns null on failure)
Related
I want to return the index of my DataFrame as a string. I am using this commandp_h = peak_hour_df.index.astype(str).str.zfill(4) It is not working, I am getting this result: Index(['1645'], dtype='object', name I need it to return the string '1645' How do I accomplish this?
In short:
do p_h = list(peak_hour_df.index.astype(str).str.zfill(4)). This will return a list and then you can index it.
In more detail:
When you do peak_hour_df.index.astype(str), as you see, the dtype is already an object (string), so that job is done. Note this is the type of the contents; not of the object itself. Also I am removing .str.zfill(4) as this is additional and does not change the nature of the problem or the retuning type.
Then the type of the whole objet you are returning is pandas.core.indexes.base.Index. You can check this like so: type(peak_hour_df.index.astype(str)). If you want to return a single value from it in type str (e.g. the first value), then you can either index the pandas object directly like so:
peak_hour_df.index.astype(str)[0]
or (as I show above) you can covert to list and then index that list (for some reason, most people find it more intuitive):
peak_hour_df.index.astype(str).to_list()[0]
list(peak_hour_df.index.astype(str))[0]
I have written a function which generate a TimeStamp and convert it to a String using toString(). I want to remove the whitespaces and other special character from that string. Is there is any efficient way to do it ?
This is a function which generate ID using TimeStamp , since timestamp will be unique (Note : When IDs are generated at different M.Sec)
fun autoGenerateID() : String = Timestamp(java.util.Date().getTime()).toString()
When I call the function, It should return :
20190612121912463
But the produced result was :
2019-06-12 12:19:12.463
I would suggest dropping the use of Timestamp class. it is outdated and anything it provides can be achieved in easier ways.
For your use case you could just use the SimpleDateFormat. It would look like this:
SimpleDateFormat("yyyyMMddHHmmssSSS").format(Date())
I am passing a date as a parameter where daydate is the parameter
string daydate
The content of daydate is 3/3/2017 12:00:00 AM
I am doing this to remove the time and still the time does not go away
string strCleanDate = String.Format("{0:M/d/yyyy}", daydate);
How can I remove the time?
That is because the formatter is ignored as the instance you are passing to string.Format is a string so the placeholder is filled with the value you passed in and the format is ignored completely. If you want to apply DateTime formatting you need to pass in an instance of a DateTime type.
Your first fix should be to change your parameter to be of type DateTime and not string. Otherwise a caller could pass "HI THERE" and your method/application would break, or worse push that value to a store and now your store is polluted with invalid value(s).
public void SomeMethod(DateTime daydate)
{
var dateOnly = dayDate.Date;
}
You should pass dayDate as a DateTime value instead of as a string. Then the format will work correctly.
I'm using the Apache POI framework for parsing large Excel spreadsheets. I'm using this example code as a guide: XLSX2CSV.java
I'm finding that cells that contain just numbers are implicitly being treated as numeric fields, while I wanted them to be treated always as strings. So rather than getting 1.00E+13 (which I'm currently getting) I'll get the original string value: 10020300000000.
The example code uses a XSSFSheetXMLHandler which is passed an instance of DataFormatter. Is there a way to use that DataFormatter to treat all cells as strings?
Or as an alternative: in the implementation of the interface SheetContentsHandler.cell method there is string value that is the cellReference. Is there a way to convert a cellReference into an index so that I can use the SharedStringsTable.getEntryAt(int idx) method to read directly from the strings table?
To reproduce the issue, just run the sample code on an xlsx file of your choice with a number like the one in my example above.
UPDATE: It turns out that the string value I get seems to match what you would see in Excel. So I guess that's going to be "good enough" generally. I'd expect the data I'm sent to "look right" and therefore it'll get parsed correctly. However, I'm sure there will be mistakes and in those cases it'd be nice if I could get at the raw string value using the streaming API.
To resolve this issue I created my own class based on XSSFSheetXMLHandler
I copied that class, renamed it and then in the endElement method I changed this part of the code which is formatting the raw string:
case NUMBER:
String n = value.toString();
if (this.formatString != null && n.length() > 0)
thisStr = formatter.formatRawCellContents(Double.parseDouble(n), this.formatIndex, this.formatString);
else
thisStr = n;
break;
I changed it so that it would not format the raw string:
case NUMBER:
thisStr = value.toString();
break;
Now every number in my spreadsheet has its raw value returned rather than a formatted version.
I use YamlDotnet to parse a yaml stream to a dictionary of string object via the YamlStream.
The YamlMappingType, YamlSequenceNode and YamlScalarNode are used in order to convert the value to a dictionary, a list or a string.
But I need to get a real boolean value instead of the string equivalent, and for that I use
bool.TryParse(value.ToString(), out valueBool)
value veing a YamlNode.
Is there a better way to do that?
Perhaps another child type of YamlNode?
EDIT:
I don't know the content of the YAML file, I just want to get a dictionary with his values.
Instead of doing the parsing manually, you should use the Deserializer class, which will convert a YAML document into an object graph.
var deserializer = new Deserializer();
var parsed = deserializer.Deserialize<...>(input);
You can see a working example here