Cannot Load Jdbc Driver Class Net Sourceforge Jtds

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I have gone to 'Add Library', selected 'User Library', defined a User Library called jTDS and imported the jtds-1.2.5.jar file into the User Library. I assume that the newly-christened 'jTDS' library is included in the build path as my only option when right-clicking on it is to remove it from the build-path. NOTE: (example) the jtds driver doesn't work until you load the jcifs jar on wich it depends. Those who want to use orajdbclink only oracle-to-oracle, can use orajdbclinko2o.zip to have some optimizations, and haven't to. Load oracle jdbc drivers, because are already shipped in the oracle JVM. 无法加载JDBC驱动程序类：net.sourceforge.jtds.jdbc.Driver 基本上是因为你的应用程序有jtds.jar的依赖是在classpath中无法使用，因此首先从这里下载JAR并将其添加到类路径中。. Open source JDBC 3.0 type 4 driver for Microsoft SQL Server (6.5 up to 2012) and Sybase ASE. JTDS is a complete implementation of the JDBC 3.0 spec jTDS - SQL Server and Sybase JDBC driver - Browse /jtds/1.3.1 at SourceForge.net.


What is ?


A simple and flexible way to get data from any jdbc reachabledatabase.

For example you can easly create an oracle view (materialized ornot), from

a query performed directly on a Microsoft SQL Server (for example,but may be MySQL, PostGre, or an old version of Oracle

like 7.3.4 no more reachable from dblinks) via JDBC.

You will end up doing something like:


SQL*Plus: Release 10.2.0.1.0 - Production on Sat Sep 15 11:14:422007

Copyright (c) 1982, 2005, Oracle. All rights reserved.

Connected to:

Oracle Database 10g Release 10.2.0.2.0 - Production


Cannot Load Jdbc Driver Class Net Sourceforge Jtds

SQL> select code, description from table(mysqlsrv.view_item)where code= '001'

Where mysqlsrv.view_item is a pipe lined pl/sql functionusing orajdbclink api to return records:


--create a package for pipelined views in your application schema

--NOTE: first grant all on orajdbclink_o2a.jcursor to <yourapplication schema>


createorreplace

packageMYSQLSRV as


typeview_item_record is record

(

codevarchar2(255),

descriptionvarchar2(2000)

);

typeview_item_table istableof view_item_record;


functionview_item

returnview_item_table

pipelined;


functionview_item_by_code(p_code varchar2)

returnview_item_table

pipelined;


endMYSQLSRV;

/


createorreplace

packagebody MYSQLSRV as


functionview_item

returnview_item_table

pipelined

as

v_cursororajdbclink_o2a.jcursor:= orajdbclink_o2a.jcursor('selectcode, description from item_table','MYSQLSRV',2);--define the cursor query

v_recordview_item_record;

begin


v_cursor.init;-- open connection, and prepare query

v_cursor.open;-- execute query



whilev_cursor.dofetch = 1 loop -- fetch queryresults into your view record

v_record.code:=v_cursor.get_string(1); -- code

v_record.description:=v_cursor.get_string(2); -- description

piperow (v_record); --pipe row to the query

endloop;


v_cursor.close;-- close resources


exception

whenothers then-- if something happens

v_cursor.close;-- close resources

raise;-- raise the exception

end;


functionview_item_by_code(p_code varchar2)

returnview_item_table

pipelined

as

v_cursororajdbclink_o2a.jcursor:= orajdbclink_o2a.jcursor('selectcode, description from item_table where code= ?','MYSQLSRV',2);--define the cursor query

v_recordview_item_record;

begin


v_cursor.init;-- open connection, and prepare query

v_cursor.open;-- execute query

v_cursor.bind(1,p_code);-- bind code variable



whilev_cursor.dofetch = 1 loop -- fetch queryresults into your view record

v_record.code:=v_cursor.get_string(1); -- code

v_record.description:=v_cursor.get_string(2); -- description

piperow (v_record); --pipe row to the query

endloop;


v_cursor.close;-- close resources


exception

Datasource

whenothers then-- if something happens

v_cursor.close;-- close resources

raise;-- raise the exception

end;


endmysqlsrv;

/


So you can:


--slow

SQL> select code, description from table(mysqlsrv.view_item)where code= '001'


--fast may use an index on remote database

SQL> select code, description fromtable(mysqlsrv.view_item_by_code('001'))


--faster: create a materialized view

Cannot Load Jdbc Driver Class Net Sourceforge Jtds

SQL> create materialized view mv_item

refresh complete

as select * from table(mysqlsrv.view_item)

This will not work with Oracle XE because actually, it doesn'thave the aurora internal JVM. (Java Option)

Any other database edition should work.


Why ?


This was born to make 10g talk with 7.3.4. But it can be used forany purpose.

Jtds


You can:


1) use it like a normal view but it will be slooow to processwhere clauses

2) add a parameter to the function to have the remote database useindexes (see above)

3) create a materialized view on top of it, index materializedview columns, and use it locally


Features

  • Enables to connect any jdbc reachable database to oracle

  • Enables to query other databases from PL/SQL

  • Enables to call remote stored procedures, or DML

  • Enables to reach old versions of Oracle no more reachable by dblinks



User feedback will drive development, submit your requests:


Download


Source/Doc or Binary package:


or CVS (updated frequently):

Use it


  1. Download the orajdbclink_o2a.zip (oracle-to-any) file

  2. unzip in on a computer that has an oracle client installed and can reach the target Oracle server or directly on the oracle server

  3. cd orajdbclink_o2a

  4. sqlplus “sys/<syspwd>@<connstr> as sysdba” @initoracletoany.sql #(when prompted for connstr write “@<your connection string>” or live it blank if you are on the server)

  5. loadjava -resolve -verbose -user orajdbclink_o2a/orajdbclink_o2a@<connstr> jcifs-xx.jar jtds-xx.jar #(jtds.jar depends on jcifs.jar)

  6. Use you favorite tool to insert records in the JDBC_DBLINK table (DATA_SORCE_NAME: a name for the remote database, URL: the jdbc url, DBUSER: the user for the remote database, DBPASSWORD: the password for that user, DRIVER: the jdbc driver class):

    DATA_SORCE_NAME: MYSQLSRV

    URL: jdbc:jtds:sqlserver://myhost:1433/mydatabase

    DBUSER: myuser

    DBPASSWORD: mypwd

    DRIVER: net.sourceforge.jtds.jdbc.Driver

  7. test it:


set serveroutput on;

--test jcursor

declare

v_cursororajdbclink_o2a.jcursor:= orajdbclink_o2a.jcursor('selectcol1, col2, col5 from sqlservertable','MYSQLSRV',3);

begin


dbms_java.set_output(10000);


v_cursor.init;

v_cursor.open;



whilev_cursor.dofetch = 1 loop

dbms_output.put_line(v_cursor.get_string(1));

dbms_output.put_line(v_cursor.get_string(2));

dbms_output.put_line(v_cursor.get_string(3));

endloop;


v_cursor.close;


exception

whenothers then

dbms_output.put_line('err:'||sqlerrm(sqlcode));

v_cursor.close;

end;



--test jcall

declare

v_callorajdbclink_o2a.jcall:= orajdbclink_o2a.jcall('insertinto sqlservertable (col) values (?)','MYSQLSRV');

begin


dbms_java.set_output(10000);


v_call.init;

v_call.bind(1,'hello');

v_call.executecall;

v_call.close;

exception

whenothers then

dbms_output.put_line('err:'||sqlerrm(sqlcode));

v_call.rollback;-- if something bad happens we rollbackthe jcall connection

v_call.close;

end;



Any exception will be visible in the serveroutput.

You can use as many drivers as you want. All you need to do is toload the jar files of drivers and dependecy into orajdbclink_o2aschema.

NOTE: (example) the jtds driver doesn'twork until you load the jcifs jar on wich it depends.


Those who want to use orajdbclink onlyoracle-to-oracle, can use

orajdbclink_o2o.zip to have someoptimizations, and haven't to

load oracle jdbc drivers, because arealready shipped in the oracle JVM.

Transactions


Actually there is no way to get a realdistributed transaction, like a real oracle database link,

so speaking by example:


--TEST 1: transaction isolation

declare

v_callorajdbclink_o2a.jcall;

v_cursororajdbclink_o2a.jcursor;

begin


dbms_java.set_output(10000);


--suppose 'sqlservertable' to be empty

v_call:=orajdbclink_o2a.jcall('insert intosqlservertable (col) values (?)','MYSQLSRV');

v_call.init;

v_call.bind(1,'hello');

v_call.executecall;

v_call.close;

--actually v_call is not committed

v_cursor:=orajdbclink_o2a.jcursor('select col fromsqlservertable','MYSQLSRV',1);

v_cursor.init;

Cannot Load Driver Class Net.sourceforge.jtds.jdbc.driver Weblogic

v_cursor.open;



whilev_cursor.dofetch = 1 loop

dbms_output.put_line(v_cursor.get_string(1));--this will print out a 'hello' becausev_cursor uses the same jdbc connection

endloop;

v_cursor.close;


raise_application_error(-20002,'Somethingbad happens'); -- something bad happens,so v_call will be rolled back

--if we remove this line the connectionmanager will commit the

--transaction at the end of the pl/sql call(oracle.aurora.memoryManager.EndOfCallRegistry).

exception

whenothers then

dbms_output.put_line('err:'||sqlerrm(sqlcode));

v_call.rollback;-- if something bad happens we rollbackthe jcall connection

v_call.close;

end;





--TEST 2: no distributed transaction

declare

v_callorajdbclink_o2a.jcall;

begin


dbms_java.set_output(10000);


--suppose 'sqlservertable' to be empty

v_call:=orajdbclink_o2a.jcall('insert intosqlservertable (col) values (?)','MYSQLSRV');

v_call.init;

v_call.bind(1,'hello');-- ALWAYS USE BIND VARIABLES !!!!

v_call.executecall;

Could Not Load Db Driver Class Net.sourceforge.jtds.jdbc.driver

v_call.close;

--actually v_call is not committed


insertintomytable values(1,2,3);


--NOTE: If somthing goes wrong before that commit all will goes fine:the local and the remote transaction

--will be rolled back

commit;


--WARNING: if we loose the connection with the remote host here(between 'commit' and 'end') we will lost thejcall transaction !!

--SO USE IT AT YOUR OWN RISK

exception

whenothers then

rollback;

v_call.rollback;-- if something bad happens we rollbackthe jcall connection

v_call.close;

dbms_output.put_line('err:'||sqlerrm(sqlcode));

end;



For those who wants to useoracle-to-oracle

  1. Download the orajdbclink_o2o.zip (oracle-to-oracle) file

  2. unzip in on a computer that has an oracle client installed and can reach the target Oracle server or directly on the oracle server

  3. cd orajdbclink_o2o

  4. sqlplus “sys/<syspwd>@<connstr> as sysdba” @initoracletooracle.sql #(when prompted for connstr write “@<your connection string>” or live it blank if you are on the server)

  5. Use you favorite tool to insert records in the JDBC_DBLINK table (DATA_SORCE_NAME: a name for the remote database, URL: an oracle jdbc url, DBUSER: the user for the remote oracle database, DBPASSWORD: the password for that user, EXPLICIT_CACHING: false (used only for testing), IMPLICIT_CACHING: false (used only for testing), ARRAYSIZE: how many rows to prefetch from server):

    DATA_SORCE_NAME: MY734

    URL: jdbc:oracle:thin:@m734server:1521:my734

    DBUSER: scott

    DBPASSWORD: tiger

    EXPLICIT_CACHING: false

    IMPLICIT_CACHING: false

    ARRAYSIZE: 500

  6. test it as of orajdbclink_o2a

Cannot Load Jdbc Driver Class Net.sourceforge.jtds.jdbc.driver


Cannot Load Jdbc Driver Class 'net.sourceforge.jtds.jdbc.driver'


Troubleshooting

If you get any other problem please submit a support request:


Driver Class Java

About

orajdbclink is developed by Andrea A.A. Gariboldi

mailto: andrea.gariboldi <at> gmail.com

Cannot Load Jdbc Driver Class 'net.sourceforge.jtds.jdbc.driver' Jmeter