I am learning ADO.NET and now I am trying to understand the SqlDataReader. I am trying to learning by using this tutorial and I am facing some difficulties now in understanding the following part of the code mentioned HERE:
while (rdr.Read())
{
// get the results of each column
string contact = (string)rdr["ContactName"];
string company = (string)rdr["CompanyName"];
string city = (string)rdr["City"];
// print out the results
Console.Write("{0,-25}", contact);
Console.Write("{0,-20}", city);
Console.Write("{0,-25}", company);
Console.WriteLine();
}
I want to understand the meaning of "{0, -25}"
This means that the WriteLine method schould print the value of the first parameter, in your case contact, to a width of 25 characters. The minus in front of the 25 indicates a left justified output.
That is a format specifier for .NET Console.Write().
See documentation explaining here:
http://msdn.microsoft.com/en-us/library/9xdyw6yk.aspx
IN SqlDataReader, it reads record from database based on query.
sqlDataReader read record at a time single row. it means rdr["ContactName"] is one value and it read and move to string contact and so on every fields.
It fetch all record in while loop.
And Console.Write("{0,-25}", contact) is used to format output.
Related
I'm dealing with many CSVs files that don't have a fixed header/column, saying that I can get file1.csv with 10 column and file2.csv with 50 column.
I can't know in advance the number of column that I'll have, I can't create a specific job for each file type, my input will be a black box: bunch of CSV that will have an X number of column from 10 to infinite.
As I want to use Spring Batch to auto import these CSVs, I want to know if it is possible? I know that I have to get a fixed number of column because of the processor and the fact that I need to serialize my data into a POJO before sending it back to a writer.
Could my processor serialize an Array? beside sending one simple Object, can I get an Array of Object and in the end of my job I'll will have an Array of an Array of Object?
What do you think?
Thanks
I arrived to this old post with the very same question. Finally I managed to build a dynamic column FlatFileItemReader with the help of the skippedLinesCallback so I leave it here:
#Bean
public FlatFileItemReader<Person> reader() {
DefaultLineMapper<Person> lineMapper = new DefaultLineMapper<>();
DelimitedLineTokenizer delimitedLineTokenizer = new DelimitedLineTokenizer();
lineMapper.setLineTokenizer(delimitedLineTokenizer);
lineMapper.setFieldSetMapper(new BeanWrapperFieldSetMapper<>() {
{
setTargetType(Person.class);
}
});
return new FlatFileItemReaderBuilder<Person>()
.name("personItemReader")
.resource(new FileSystemResource(inputFile))
.linesToSkip(1)
.skippedLinesCallback(line -> delimitedLineTokenizer.setNames(line.split(",")))
.lineMapper(lineMapper)
.build();
}
In the callback method you update the names of the tokenizer from the header line. You could also add some validation logic here. With this solution there is no need to write your own LineTokenizer implementation.
Create your own LineTokenizer implementation. The DelimitedLineTokenizer expects a predefined number of columns. If you create your own, you can be as dynamic as you want. You can read more about the LineTokenizer in the documentation here: http://docs.spring.io/spring-batch/apidocs/org/springframework/batch/item/file/transform/LineTokenizer.html
I'm new to writing apex triggers. I've looked through a lot of the apex developer documentation, and I can't seem to find the combination of functions that I should use to automatically trim characters from a text field.
My org has two text fields on the Case object, which automatically store the email addresses that are included in an email-to-case. The text fields have a 255 character limit each. We are seeing errors pop up because the number of email addresses that these fields contain often exceeds 255 characters.
I need to write a trigger that can trim these text fields to the last ".com" before it hits the 255 character limit.
Perhaps I'm going about this all wrong. Any advice?
You can use replace() function in Apex.
String s1 = 'abcdbca';
String target = 'bc';
String replacement = 'xy';
String s2 = s1.replace(target, replacement);
If you need to use regular expression to find the pattern, then you can use replaceAll()
String s1 = 'a b c 5 xyz';
String regExp = '[a-zA-Z]';
String replacement = '1';
String s2 = s1.replaceAll(regExp, replacement);
For more information please refer Apex Reference Guide
The following code I think that covers what you are searching:
String initialUrl = 'https://stackoverflow.com/questions/69136581/what-function-do-i-use-in-a-salesforce-apex-trigger-to-trim-a-text-field';
Integer comPosition = initialUrl.indexOf('.com');
System.debug(initialUrl.left(comPosition + 4));
//https://stackoverflow.com
The main problems that I see are that other extensions are not covered (like ".net" urls) and that urls that have a ".com" appearing previous to the last one (something like "https://www.comunications.com"). But I think that this covers most of the use cases.
Why not increasing the length of that specific field? Trimming the text might cause data loss or unusable. Just go to object manager find that object and that specific field. Edit field and increase the length.
I've got a dataflow with a csv file as source. The column NewPositive is a string and it contains numbers formatted in European style with a dot as thousand seperator e.g 1.019 meaning 1019
If I use the function toInteger to convert my NewPositive column to an int via toInteger(NewPositive,'#.###','de'), I only get the thousand cipher e.g 1 for 1.019 and not the rest. Why? For testing I tried creating a constant column: toInteger('1.019','#.###','de') and it gives 1019 as expected. So why does the function not work for my column? The column is trimmed and if I compare the first value with equality function: equals('1.019',NewPositive) returns true.
Please note: I know it's very easy to create a workaround by toInteger(replace(NewPositive,'.','')), but I want to learn how to use the toInteger function with the locale and format parameters.
Here is sample data:
Dato;NewPositive
2021-08-20;1.234
2021-08-21;1.789
I was able to repro this and probably looks to be a bug to me . I have reported this to the ADF team , will let you know once I hear back from them . You already have a work around please go ahead that to unblock yourself .
I am using a row id to obtain the cells for a single row. However, the response returns the column id but not the title of the column. In an attempt to make the code readable for others it would be helpful to also obtain the column title. I was thinking of doing this by using the column id that is obtained in the getRow function but I am not entirely sure how to catch it. Below is the basic getRow function for reference. I appreciate any assistance. Thank you in advance all.
smartsheet.sheets.getRow(options)
.then(function(row) {
console.log(row);
})
.catch(function(error) {
console.log(error);
});
My preferred way of addressing this is to dynamically create a column map on my first GET /sheets/{sheetId} request.
Let's say we have a sheet with three columns: Japan, Cat, and Cafe. Here is one way to make a column map.
const columnMap = makeColumnMap(<your sheet data>);
function makeColumnMap(sheetData){
const colMap = {};
sheetData.columns.map( column => colMap[column.title] = column.id);
return colMap;
}
Now, you can reference your specific columns like this: columnMap["Japan"], columnMap["Cat"], and columnMap["Cafe"] or you can use dot notation if you prefer.
Basically, what we're doing is creating a dictionary to map the column titles to the corresponding column id.
Posting this as a separate answer based on your response (and for easier formatting).
I have a couple specific recommendations that will help you.
Try to consolidate your API calls.
I then want to use that columnID to call getColumns(columnId) to obtain the title.
This is 'work' that you don't need to do. A single GET /sheets/{sheetId} will include all the data you need in one call. It's just a matter of parsing the JSON response.
Use this as an opportunity to improve your ability to work with JSON.
I do not know how to catch the columnId once getRow() is called.
The response is a single object with nested arrays and objects. Learning to navigate the JSON in a way that makes sense to you will come in really handy.
I would recommend saving the response from a GET sheet call as it's own JSON file. From there, you can bring it into your script and play with your logic to reference the values you want.
I'm using a plugin and want to perform an action based on the records statuscode value. I've seen online that you can use entity.FormattedValues["statuscode"] to get values from option sets but when try it I get an error saying "The given key was not present in the dictionary".
I know this can happen when the plugin cant find the change for the field you're looking for, but i've already checked that this does exist using entity.Contains("statuscode") and it passes by that fine but still hits this error.
Can anyone help me figure out why its failing?
Thanks
I've not seen the entity.FormattedValues before.
I usually use the entity.Attributes, e.g. entity.Attributes["statuscode"].
MSDN
Edit
Crm wraps many of the values in objects which hold additional information, in this case statuscode uses the OptionSetValue, so to get the value you need to:
((OptionSetValue)entity.Attributes["statuscode"]).Value
This will return a number, as this is the underlying value in Crm.
If you open up the customisation options in Crm, you will usually (some system fields are locked down) be able to see the label and value for each option.
If you need the label, you could either do some hardcoding based on the information in Crm.
Or you could retrieve it from the metadata services as described here.
To avoid your error, you need to check the collection you wish to use (rather than the Attributes collection):
if (entity.FormattedValues.Contains("statuscode")){
var myStatusCode = entity.FormattedValues["statuscode"];
}
However although the SDK fails to confirm this, I suspect that FormattedValues are only ever present for numeric or currency attributes. (Part-speculation on my part though).
entity.FormattedValues work only for string display value.
For example you have an optionset with display names as 1, 2, 3,
The above statement do not recognize these values because those are integers. If You have seen the exact defintion of formatted values in the below link
http://msdn.microsoft.com/en-in/library/microsoft.xrm.sdk.formattedvaluecollection.aspx
you will find this statement is valid for only string display values. If you try to use this statement with Integer values it will throw key not found in dictionary exception.
So try to avoid this statement for retrieving integer display name optionset in your code.
Try this
string Title = (bool)entity.Attributes.Contains("title") ? entity.FormattedValues["title"].ToString() : "";
When you are talking about Option set, you have value and label. What this will give you is the label. '?' will make sure that the null value is never passed.