java oracle raw,Oracle RAW id列和JDBC

I am trying to develop a simple Java servlet that calls an Oracle 11g XE database. The database I was provided uses RAW column types for the IDs on all tables.

Initially I tried to just get the data back from JDBC and base64 encode the VARBINARY byte arrays that were being returned so I could pass the results via JSON to the front end system. However, after base64 decoding and trying to set the byte array back to the column, Oracle/JDBC was not returning data.

I decided to try and have Oracle do the encoding/decoding and was able to get the following queries to fire in Oracle using SQL Developer 2.

SELECT utl_encode.base64_encode(IDCOLUMN), FIRST_NAME FROM TABLENAME

SELECT utl_encode.base64_encode(IDCOLUMN), FIRST_NAME FROM TABLENAME WHERE IDCOLUMN = utl_encode.base64_decode('BASE64STRING')

However when executing these queires using JDBC:

conn = isConnSupplied ? userConn : ResourceManager.getConnection();

Statement stmt = conn.createStatement();

try {

ResultSet rset = stmt.executeQuery("SELECT utl_encode.base64_encode(IDCOLUMN), FIRST_NAME FROM TABLENAME");

try {

while (rset.next())

System.out.println (rset.getString(1)); // Print col 1

}

finally {

try { rset.close(); } catch (Exception ignore) {}

}

}

finally {

try { stmt.close(); } catch (Exception ignore) {}

}

I get the following error:

java.sql.SQLException: ORA-29261: bad argument

ORA-06512: at "SYS.UTL_ENCODE", line 8

ORA-06512: at "SYS.UTL_ENCODE", line 243

oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:445)

oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:396)

oracle.jdbc.driver.T4C8Oall.processError(T4C8Oall.java:879)

oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:450)

oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:192)

oracle.jdbc.driver.T4C8Oall.doOALL(T4C8Oall.java:531)

oracle.jdbc.driver.T4CStatement.doOall8(T4CStatement.java:193)

oracle.jdbc.driver.T4CStatement.executeForDescribe(T4CStatement.java:866)

oracle.jdbc.driver.OracleStatement.executeMaybeDescribe(OracleStatement.java:1167)

oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1289)

oracle.jdbc.driver.OracleStatement.executeQuery(OracleStatement.java:1491)

oracle.jdbc.driver.OracleStatementWrapper.executeQuery(OracleStatementWrapper.java:406)

com.pearson.familyportal.servlet.WebController.doPost(WebController.java:97)

com.pearson.familyportal.servlet.WebController.doGet(WebController.java:171)

javax.servlet.http.HttpServlet.service(HttpServlet.java:621)

javax.servlet.http.HttpServlet.service(HttpServlet.java:722)

Question: What is the best way to deal with the RAW ID column byte arrays when I have to pass these around on the client side? If letting Oracle do the conversion, what am I doing wrong that JDBC isn't liking?

Thanks in advance.

解决方案

Try using RAWTOHEX and HEXTORAW.