Develop Reference

Amazon S3 Select Issue : not supporting line break occurring inside fields

I am trying to use Amazon S3 Select to read records from a CSV file and if the field contains a line break(\n), then the record is not being parsed as a single record. Also, the line break inside the field has been properly escaped by double quotes as per standard CSV format.
For example, the below CSV file
Id,Name,Age,FamilyName,Place
p1,Albert Einstein,25,"Einstein
Cambridge",Cambridge
p2,Thomas Edison,30,"Edison
Cardiff",Cardiff
is being parsed as
Line 1 : Id,Name,Age,FamilyName,Place
Line 2 : p1,Albert Einstein,25,"Einstein
Line 3 : Cambridge",Cambridge
Line 4 : p2,Thomas Edison,30,"Edison
Line 5 : Cardiff",Cardiff
Ideally it should have been parsed as given below:
Line 1:
Id,Name,Age,FamilyName,Place
Line 2:
p1,Albert Einstein,25,"Einstein
Cambridge",Cambridge
Line 3:
p2,Thomas Edison,30,"Edison
Cardiff",Cardiff
I'm setting AllowQuotedRecordDelimiter to TRUE in the SelectObjectContentRequest as given in their documentation. It's still not working.
Does anyone know if Amazon S3 Select supports line break inside fields as described in the case mentioned above? Or any other parameters I need to change or set to make this work?

This is being parsed / printed correctly. The confusion lies in that the literal newline is being printed in the output. You can test this if you run the following expression on the given csv:
SELECT COUNT(*) from s3Object s
Output: 2
Note that if you specify only the third column, you get only the correct value:
SELECT s._3 frin s3Object s
You get only the parts of each line that enclose said field:
"Einstein
Cambridge"
"Edison
Cardiff"
What's happening is the character in the field is the same as the default CSVOutput.RecordDelimiter value (\n) which is causing a clash. If you want to separate each field in a different way, you could add the the following to the CSVOutput part of the OutputSerialization:
"RecordDelimiter": "\r\n"
or use some other type of 1-2 length character sequence in place of \r\n

JSON not reading escape symbols from DB

So, I got values from DB #Table that contains column with String value and json in it. But as I try to map it with ObjectMapper.writeValueAsString() all i get is this (Also implying that those escape symbols as backward slashes are in a string):
\"list\" [ \"key\":\"value\", ... , \"key\":\"value\"] }
It also appears that #Entity class have other fields as that table columns, but they seem to map okay, without escape symbols inside a String
Any idea why that happens? Thanks in advance

Try
String yourJson = "{Key:\\'aa'}";
String a = yourJson.replace("\\","");
System.out.println(a);
Similar:
unclosed string literal error at compile time because it contains double quotes and pre tags of HTML

Getting string from database that includes \n, getting \\n instead

Column in Oracle which contains string including \n, its returning \\n in place of single \n. Is there any way to get the exact string that's in the database?
//getting fileExposure from oracle db
List<FileExposure> fileExposure =dao.find(FileExposure.class,1);
//geting the string sample_data-->"this is a simple data\n for other features\n"
String sample_data=fileExposure.getSampleData();
//it returning "this is a simple data\\n for other features\\n"

sample_data.replaceAll("\\\\n", "\\n")

Special chars in JAVA

สวัสดี Mr.Java Sp'e c'i'a'l'' '
I tried to parse the String using below code but I could't make
simply it shows the wrong value.
String s = "สวัสดี Mr.Java Sp'e c'i'a'l'' '"";
s = s.replaceAll("'", "'");
//s = s.replaceAll("'", "''");
StringEscapeUtils.escapeHtml(s);
I am trying to get from JSP and save in SQL Server DB and show using JSP and update.
But some times in JSP it shows the converted &apos in jsp as it is instead of Special
Chars.
Very Simple is Here I have shown this String(สวัสดี Mr.Java Sp'e c'i'a'l'' ') in StackOverflow they
save in their DB and Shows and allows me to update this is what I
wanted.

OK. So lets look at what your code does:
// line 1
String s = "สวัสดี Mr.Java Sp'e c'i'a'l'' '";
We have a String with various international characters in it ... and some "'" characters.
// line 2
s = s.replaceAll("'", "'");
Assuming that those are really "'" characters characters, we will replace all instances of "'" with an XML / HTML character entity giving us:
"สวัสดี Mr.Java Sp'e c'i'a'l'' '"
And so ...
// line 3
s = StringEscapeUtils.escapeHtml(s);
This replaces any active HTML / XML characters with character references. This includes the ampersand characters "&" that you previously inserted. The result is this:
"&#xxxx;&#xxxx;&#xxxx;&#xxxx; Mr.Java Sp'e
c'i'a'l'' '"
(The &#xxxx; numeric character references encode those Thai (?) characters.)
When you embed that in an HTML document and display it, you will see "สวัสดี Mr.Java Sp'e c'i'a'l'' '"
See what has happened? You have HTML escaped your HTML escaped apostrophies!!
So what do you really need to do?
There is no need replace apostrophes with '. Apostrophes are legal in HTML text.
There should be no need to add HTML escapes so that you can store text in a database:
Any modern database will allow you to store Unicode strings without any special encoding.
If you are trying to prevent the database's SQL parser getting confused by quotes in the text you are storing, you are doing it the wrong way. The right way to do this is to use a PreparedStatement, add parameter placeholders to the query, and use the PreparedStatement.setXxx methods to provide the parameter values. The execute (or whatever) will take care of any SQL escaping that needs to be done.

How to Insert in Oracle using java

I am having CLOB column in Oracle Data Base , I want to insert String .
It works if I use setCharacterStream, but how to insert String by setBytes am getting exception.
Please help me.
String s = "Hello How are you Data for CLOB column";
ps.setCharacterStream(1, new StringReader(s), s.length());
ps.setByte(1,Byte.parseByte(s));
Exception Trace :
java.lang.NumberFormatException: For input string: "Hello How are you Data for CLOB column"
at java.lang.NumberFormatException.forInputString(NumberFormatException.java:48)
at java.lang.Integer.parseInt(Integer.java:447)
at java.lang.Byte.parseByte(Byte.java:151)
at java.lang.Byte.parseByte(Byte.java:108)
at colb.test.InertClob.main(InertClob.java:24)

Here are two good examples (with sample code, for select and insert):
Handling CLOBS made easy:
http://rocksolutions.wordpress.com/2010/06/07/handling-clobs-made-easy-with-oracle-jdbc-10g/
Adding large object type to databaase
http://docs.oracle.com/javase/tutorial/jdbc/basics/blob.html

please refer to the Java API DOC
Parses the string argument as a signed decimal byte. The characters in the string must all be decimal digits,

You should:
Turn the String to a byte array by calling s.getBytes() for example or any other.
Call setBytes method, not setByte
When retrieving from the database, don't forget how you got the bytes, in order to restore the String properly.