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Getting wrong characters from Clob field in Oracle using java jdbc


Getting wrong characters from Clob field in Oracle using java jdbc

By : user3045349
Date : December 02 2020, 10:46 PM
it fixes the issue The link in the comment solved the problem, i change the Writer and add the suport for UTF8:
code :
Writer fstream = new OutputStreamWriter(new FileOutputStream(mergedFile), StandardCharsets.UTF_8);


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Losing newline characters when saving Java string to Oracle CLOB field

Losing newline characters when saving Java string to Oracle CLOB field


By : user2930472
Date : March 29 2020, 07:55 AM
will help you Here is a link to a thread addressing the same issue:
Are escape sequences preserved in CLOB??
How to update Oracle Clob by using JDBC

How to update Oracle Clob by using JDBC


By : illusiveman1908
Date : March 29 2020, 07:55 AM
it helps some times Not sure why you call that the "normal" way, but the following works for me.
It doesn't require any retrieval of the data before updating it.
code :
String value = "So long and thanks for all the fish";
StringReader reader = new StringReader(value);
pStmt = conn.prepareStatement("UPDATE PROGRAM_HISTORY SET DETAILS = ? WHERE ID = 12");
pStmt.setCharacterStream(1, reader, value.length());
pStmt.executeUpdate();
java.lang.ClassCastException: oracle.sql.CLOB cannot be cast to oracle.sql.CLOB

java.lang.ClassCastException: oracle.sql.CLOB cannot be cast to oracle.sql.CLOB


By : S.Mule
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , I fixed the problem. Posting this answer, hoping it might be useful to someone.
When I was checking the instance type of the CLOB retrieved by the query, it came up as oracle.sql.CLOB. So I assumed it must have been a version mismatch of ojdbc.jar. I checked my project a gazillion times for multiple copies of the ojdb.jar. There were none.
JDBC Stream of CLOB in Oracle 12.2 database gives wrong encoding

JDBC Stream of CLOB in Oracle 12.2 database gives wrong encoding


By : user1502455
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further We identified the problem and found a solution (which is more of a workaround perhaps).
Under Oracle 12.1 the property oracle.jdbc.defaultLobPrefetchSize was set to -1 by default. Under Oracle 12.2 this changed to 4000, which means that the database will try to fetch everything within one query and cast the CLOB to a VARCHAR2 (if its size is under 4000, See here). This somehow doesn't work with Oracle 12.2 while the Charset WE8ISO8859P15 is used.
NotSerializableException while getting CLOB data from ORACLE using JDBC

NotSerializableException while getting CLOB data from ORACLE using JDBC


By : user4954850
Date : March 29 2020, 07:55 AM
may help you . Don't try to serialize a CLOB. Transform it to a String. A CLOB is an object that is connected to the database and allows reading data from it while the connection is open. Serializing it makes no sense, just as serializing a Socket makes no sense.
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