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From "Kathey Marsden (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-3243) (jdbc net client) exception during normal iteration through "ResultSet" of "select * from t"
Date Wed, 30 Jan 2008 21:39:35 GMT

    [ https://issues.apache.org/jira/browse/DERBY-3243?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12564181#action_12564181
] 

Kathey Marsden commented on DERBY-3243:
---------------------------------------

Oystein asked:
>However, It would be even better if
>one where able to communicate the type of each value dynamically, but
>I were not able to determine how to do this with DRDA. Does anybody
know? 

I think that the sqlType that we send with the SQLDAGRP should be set to one of the following
when we send by locator.
public	static final  int DB2_SQLTYPE_BLOB_LOCATOR = 960;    // BLOB locator
	public	static final  int DB2_SQLTYPE_NBLOB_LOCATOR = 961;
	public	static final  int DB2_SQLTYPE_CLOB_LOCATOR = 964;    // CLOB locator
	public	static final  int DB2_SQLTYPE_NCLOB_LOCATOR = 965;

Right now we always send one of these whether it is by locator or value.
	public	static final  int DB2_SQLTYPE_BLOB = 404;        // BLOB
	public	static final  int DB2_SQLTYPE_NBLOB = 405;
	public	static final  int DB2_SQLTYPE_CLOB = 408;        // CLOB
	public	static final  int DB2_SQLTYPE_NCLOB = 409;

If we send the specific SQL Type then the client should be able to branch its logic based
on that.  There are issues of backward compatibility which would have to be dealt with, but
it seems a better way for the client to figure out whether it is dealing with a locator or
a value.




> (jdbc net client) exception during normal iteration through "ResultSet" of "select *
from t"
> --------------------------------------------------------------------------------------------
>
>                 Key: DERBY-3243
>                 URL: https://issues.apache.org/jira/browse/DERBY-3243
>             Project: Derby
>          Issue Type: Bug
>          Components: JDBC
>    Affects Versions: 10.3.2.1
>         Environment: ------------------ Java Information ------------------
> Java Version:    1.4.2_03
> Java Vendor:     Sun Microsystems Inc.
> Java home:       C:\Programme\Java\j2re1.4.2_03
> Java classpath:  derbyclient.jar
> OS name:         Windows XP
> OS architecture: x86
> OS version:      5.1
> Java user name:  cbdqok
> Java user home:  C:\Dokumente und Einstellungen\cbdqok
> Java user dir:   D:\users\cbdqok\privat\osj\lib_derby_net\lib
> java.specification.name: Java Platform API Specification
> java.specification.version: 1.4
> --------- Derby Information --------
> JRE - JDBC: J2SE 1.4.2 - JDBC 3.0
> [D:\users\cbdqok\privat\osj\lib_derby_net\lib\derbyclient.jar] 10.3.1.4 - (561794)
> ------------------------------------------------------
> ----------------- Locale Information -----------------
> ------------------------------------------------------
>            Reporter: Oliver Seidel
>            Priority: Critical
>         Attachments: derby-3243_fix_double_hashmap_entry_diff.txt, derby-3243_fix_double_hashmap_entry_diff2.txt,
derby-3243_fix_double_hashmap_entry_stat.txt
>
>
> Thanks again to the DERBY developers.
> For my convenience I use the client/server variant of DERBY.  This is where the error
occurs.  I have temporarily alleviated the problem for my case by using the embedded version.
> I'm forced to use outlook and have built a program which siphons the messages into a
derby database (phase 1 -- table has two varchar fields and a clob).  When reading them back
(phase 2 -- simple select of all records in no particular order, all 3 attributes), it has
developed an exception.  This is a result of data volume.  I have reduced the problem to a
single demonstration program.
> This behaviour, and the fact that the error is not a "DERBY Exception", but a proper
exception coming back from the JDBC call, leads me to the diagnosis that it is a derby network
client jdbc problem.
> The problem has been reproduced once by Bryan Pendleton: http://www.nabble.com/IndexOutOfBoundsException-t4926228.html
> I'll try to attach the code "error.java"; it can also be found on: http://www.os10000.net/error.java
> Please use as follows:
> javac -classpath derby.jar:derbynet.jar error.java
> java -cp .:derby.jar:derbynet.jar error
> It will create a directory "test_db" and fill it with approx 120mb data.
> Then you will observe the failure. 
> /* -*- Mode:Java; c-basic-offset:8 -*- */
> // --------------------------------------------------------------------------------
> public class error {
> 	// ------------------------------------------------------------------------
> 	public static final int port = 1527;
> 	public static final String host = "127.0.0.1";
> 	// ------------------------------------------------------------------------
> 	public static void log(String x) { System.out.println(x); };
> 	// ------------------------------------------------------------------------
> 	public static void log_stacktrace(Exception e) {
>                 java.io.StringWriter sw = new java.io.StringWriter();
>                 java.io.PrintWriter pw = new java.io.PrintWriter(sw);
>                 e.printStackTrace(pw);
>                 log(sw.toString());
> 	};
> 	// ------------------------------------------------------------------------
> 	public static void start_server() {
> 		try {
> 			org.apache.derby.drda.NetworkServerControl server =
> 				new org.apache.derby.drda.NetworkServerControl(java.net.InetAddress.getByName(host),port);
> 			server.start(null);
> 			try { java.lang.Thread.sleep(5000); } catch (Exception e) { };
> 			log("started DERBY on host "+host+" port "+Integer.toString(port)+".");
> 		} catch (Exception e) {
> 			log_stacktrace(e);
> 		};
> 	};
> 	// ------------------------------------------------------------------------
> 	public static java.sql.Connection con()
> 		throws java.sql.SQLException, java.lang.ClassNotFoundException {
> 		Class.forName("org.apache.derby.jdbc.ClientDriver");
> 		String x_dbse = "test_db";
> 		String x_user = ";user=os10000";
> 		String x_pass = ";password=ding";
> 		String x_crte = ";create=true";
> 		String x_msgs = ";retrieveMessagesFromServerOnGetMessage=true";
> 		String connect = "jdbc:derby://"+host+":"+port+"/"+x_dbse+x_user+x_crte+x_msgs;
> 		return java.sql.DriverManager.getConnection(connect);
> 	};
> 	// ----------------------------------------------------------------------
> 	public static String getclob(java.sql.Clob b) {
> 		java.io.CharArrayWriter caw = new java.io.CharArrayWriter();
> 		try {
> 			java.io.Reader rd = b.getCharacterStream();
> 			char cb[] = new char[4096];
> 			int off=0, bts = rd.read(cb);
> 			while (bts>0) { caw.write(cb,off,bts); off+=bts; bts=rd.read(cb); };
> 			rd.close();
> 		} catch(Exception e) {};
> 		String res = caw.toString();
> 		caw.close();
> 		return res;
> 	};
> 	// ----------------------------------------------------------------------
> 	public static class myclob implements java.sql.Clob {
> 		String v;
> 		public myclob(String z) { v=z; };
> 		public java.io.InputStream getAsciiStream() { return new java.io.ByteArrayInputStream(v.getBytes());
};
> 		public java.io.Reader getCharacterStream() { return new java.io.CharArrayReader(v.toCharArray());
};
> 		public String getSubString(long pos, int length) { return v.substring((int)pos,(int)(pos+length));
};
> 		public long length() { return v.length(); };
> 		public long position(java.sql.Clob pattern, long start) { return 0; };
> 	        public long position(String pattern, long start) { return 0; };
> 		public java.io.OutputStream setAsciiStream(long pos) {
> 			new java.sql.SQLException("setAsciiStream not implemented."); return null; };
> 		public java.io.Writer setCharacterStream(long pos) {
> 			new java.sql.SQLException("setCharacterStream not implemented."); return null; };
> 		public int setString(long pos, String s) {
> 			new java.sql.SQLException("setString not implemented."); return -1; };
> 		public int setString(long pos, String s, int offset, int len) {
> 			new java.sql.SQLException("setString not implemented."); return -1; };
> 		public void truncate(long len) {
> 			new java.sql.SQLException("truncate not implemented."); };
> 	};
> 	public static java.sql.Clob putclob(String x) { return new myclob(x); };
> 	
> 	// ------------------------------------------------------------------------
> 	public static String getLob(java.sql.ResultSet rs, int arg)
> 		throws java.sql.SQLException { return getclob(rs.getClob(arg)); };
> 	public static void setLob(java.sql.PreparedStatement ps, int arg, String val)
> 		throws java.sql.SQLException { ps.setClob(arg,putclob(val)); };
> 	// ------------------------------------------------------------------------
> 	public static String clean_string(String x) {
> 		return x.replaceAll("[\0\r\\\\]","").replaceAll("'","\\\"").replaceAll(",+",",");
> 	};
> 	// ------------------------------------------------------------------------
> 	public static String make_string(int digits) {
> 		double dl = (Math.random()) * (Math.pow(10.0,digits*Math.random()));
> 		int len = (int) dl;
> 		byte buf[] = new byte[len];
> 		while (len>0) {
> 			double db = 256*Math.random();
> 			buf[--len] = (byte)db;
> 		};
> 		return clean_string(new String(buf));
> 	};
> 	// ------------------------------------------------------------------------
> 	public static void update(java.sql.Connection c, String cmd)
> 		throws java.sql.SQLException {
> 		c.createStatement().execute(cmd);
> 	};
> 	// ------------------------------------------------------------------------
> 	public static final int entries=100000;
> 	public static void fill_db(java.sql.Connection c)
> 		throws java.sql.SQLException {
> 		try { update(c,"drop table mail_raw"); } catch (Exception e) {};
> 		try { update(c,"create table mail_raw ( msg varchar(999), att varchar(100), val clob
)"); } 
> 		catch (Exception e) { log_stacktrace(e); };
> 		java.sql.PreparedStatement pstmt = null;
> 		try { pstmt = c.prepareStatement("insert into mail_raw values ( ?, ?, ? )"); }
> 		catch (Exception e) { log_stacktrace(e); };
> 		for (int i=0; i<entries; i++) {
> 			pstmt.setString(1,make_string(3));
> 			pstmt.setString(2,"5 body");
> 			setLob(pstmt,3,make_string(4));
> 			pstmt.executeUpdate();
> 			if (i%100==0) log("step "+i+"/"+entries);
> 		};
> 	};
> 	// ------------------------------------------------------------------------
> 	public static void dump_db(java.sql.Connection c)
> 		throws java.sql.SQLException {
> 		log("performing dump.");
> 		java.sql.ResultSet rs = c.createStatement().executeQuery("select * from mail_raw");
> 		while (rs.next()) {
> 			String msg = rs.getString(1);
> 			String att = rs.getString(2);
> 			String val = getLob(rs,3);
> 		};
> 	};
> 	// ------------------------------------------------------------------------
> 	public static void main(String args[]) {
> 		start_server();
> 		try {
> 			java.sql.Connection c = con();
> 			fill_db(c);
> 			dump_db(c);
> 		} catch (Exception e) { log_stacktrace(e); };
> 	};
> 	// ------------------------------------------------------------------------
> };

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