Parameter index move while executing PL/SQL stored procedure/function

Question

Hello, community.
Have a question for you. It looked like very easy to write some small JDBC-wrapper to handle stored procedure/functions call for Oracle.
Here is the code snippet of it:
import java.io.Serializable;
import java.sql.CallableStatement;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.HashMap;
import java.util.Iterator;
import javax.sql.DataSource;
import oracle.jdbc.driver.OracleTypes;
import org.apache.log4j.Logger;
public class SmallHelper {
     public static final int CALL_TYPE__PROCEDURE = 1;
     public static final int CALL_TYPE__FUNCTION = 2;
     public static final int PARAMETER__IN = 1;
     public static final int PARAMETER__OUT = 2;
     private static final Logger log = Logger.getLogger(SmallHelper.class);
     private Connection con = null;
     private CallableStatement statement = null;
     private String name;
     private int type;
     private int resultType;
     private HashMap arguments = new HashMap();
      * Creates connection using data source as parameter.
      * @param ds - data source
      * @throws EhlApplicationException
     public SmallHelper(DataSource ds) throws Exception {
       try {
               con = ds.getConnection();
          catch (SQLException e) {
               ExceptionHelper.process(e);
     public void registerProcedure(String name) {
          this.name = name;
          this.type = CALL_TYPE__PROCEDURE;
     public void registerFunction(String name, int resultType) {
          this.name = name;
          this.resultType = resultType;
          this.type = CALL_TYPE__FUNCTION;
      * NB! When You're dealing with stored function index should start with number 2!
     public void registerArgument(int index, Object value, int type, int inOutType) {
          arguments.put(new Long(index), new CallableStatementArgument(value, type, inOutType));
     private String getSQL() {
          StringBuffer str = new StringBuffer("{ call  ");
          if ( type == CALL_TYPE__FUNCTION )
               str.append(" ? := ");
          str.append(name).append("( ");
          for ( Iterator i = arguments.values().iterator(); i.hasNext(); ) {
               i.next();
               str.append("?");
               if ( i.hasNext() )
                    str.append(", ");
          str.append(") }");
          return str.toString();
     public void execute() throws SQLException{
          String query = getSQL();
          statement = con.prepareCall(query);
          if ( type == CALL_TYPE__FUNCTION )
               statement.registerOutParameter(1, resultType);
          for ( Iterator i = arguments.keySet().iterator(); i.hasNext(); ) {
               Long index = (Long) i.next();
               CallableStatementArgument argument = (CallableStatementArgument) arguments.get(index);
               int type = argument.getType();
               if ( argument.getInOutType() == PARAMETER__OUT )
                    statement.registerOutParameter(index.intValue(), type);
               else if ( type != OracleTypes.CURSOR )
                    statement.setObject(index.intValue(), argument.getValue(), type);
          log.info("Executing SQL: "+query);
          statement.execute();
     public CallableStatement getStatement() {
          return statement;
     public void close() throws EhlApplicationException {
          try {
               if (statement != null)
                    statement.close();
               if (con != null)
                    con.close();
          catch (SQLException e) {
               EhlSqlExceptionHelper.process(e);
     private class CallableStatementArgument implements Serializable{
          private Object value;
          private int type;
          private int inOutType;
          public CallableStatementArgument(Object value, int type, int inOutType) {
               this.value = value;
               this.type = type;
               this.inOutType = inOutType;
          public int getType() {
               return type;
          public Object getValue() {
               return value;
          public int getInOutType() {
               return inOutType;
}It was really done in 10-15 mins, so don't be very angry at code quality :)
Here is the problem.:
               helper.registerProcedure("pkg_diagnosis.search_diagnosis");
               helper.registerArgument(1, null, OracleTypes.CURSOR, EhlJdbcCallableStatementHelper.PARAMETER__OUT);
               helper.registerArgument(2, pattern, OracleTypes.VARCHAR, EhlJdbcCallableStatementHelper.PARAMETER__IN);
               helper.registerArgument(3, lang, OracleTypes.VARCHAR, EhlJdbcCallableStatementHelper.PARAMETER__IN);
               helper.registerArgument(4, EhlSqlUtil.convertSetToString(langs, ","), OracleTypes.VARCHAR, EhlJdbcCallableStatementHelper.PARAMETER__IN);
               helper.registerArgument(5, EhlSqlUtil.convertSetToString(diagnosisClass, ","), OracleTypes.VARCHAR, EhlJdbcCallableStatementHelper.PARAMETER__IN);
               helper.registerArgument(6, parentId, OracleTypes.NUMBER, EhlJdbcCallableStatementHelper.PARAMETER__IN);
               helper.execute();
               ResultSet rs = ((OracleCallableStatement) helper.getStatement()).getCursor(1);
               procedure definition:
procedure search_diagnosis (l_res OUT dyna_cur,
                           in_search_string IN VARCHAR2,
                           in_search_lang IN VARCHAR2,
                           in_lang_list IN VARCHAR2,
                           in_diag_class_list IN VARCHAR2,
                           in_parent_id IN NUMBER) Procedure call has inner check that fail because of som strange reason:
in_search_string has 2 as index, that is correct. but procedure recieves is as number 3 in parameter list (what is in_search_lang). Other parameters are moved to. It seems like a cursor takes 2 places in definition. It's clear that if I put in_search_string as 1 parameter and cursor as 0 I'll get invalid parametr bindong(s) exception. So... any ideas why 2nd parameter is actually 3rd?
Thanks beforehand.

Answer 1

hmm...moreover:
if we change procedure to function and call it in a simple way:
CallableStatement stmnt = helper.getConnection().prepareCall("begin ? := pkg_diagnosis.search_diagnosis(?,?,?,?,?); end;");
               stmnt.registerOutParameter(1, OracleTypes.CURSOR);
               stmnt.setString(2, pattern);
               stmnt.setString(3, lang);
               stmnt.setString(4, langs);
               stmnt.setString(5, diagnosisClass);
               stmnt.setObject(6, parentId, OracleTypes.NUMBER);
               stmnt.execute();
               ResultSet rs = (ResultSet) stmnt.getObject(1);the exception is:
[BEA][Oracle JDBC Driver][Oracle]ORA-06550: line 1, column 14:
PLS-00382: expression is of wrong type
ORA-06550: line 1, column 7:
PL/SQL: Statement ignoredif we return some string or number - it works. but when we want cursor back - it fails.
cursor is defined like ordinary dynamic cursor:
TYPE dyna_cur IS REF CURSOR;