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What is ?
Driver class 'net.sourceforge.jtds.jdbc.Driver' could not be found, make sure the 'MS SQL Server' driver (jar file) is installed. WARNUNG: Could not load driverClass net.sourceforge.jtds.jdbc.Driver java.lang.ClassNotFoundException: net.sourceforge.jtds.jdbc.Driver I am not sure where to place the class driver file and how to set the class path. 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.
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
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
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
Holger czukay persian love. 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
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
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.
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
Download the orajdbclink_o2a.zip (oracle-to-any) file
unzip in on a computer that has an oracle client installed and can reach the target Oracle server or directly on the oracle server
cd orajdbclink_o2a
sqlplus 'sys/@ as sysdba' @initoracletoany.sql #(when prompted for connstr write '@' or live it blank if you are on the server)
loadjava -resolve -verbose -user orajdbclink_o2a/orajdbclink_o2a@ jcifs-xx.jar jtds-xx.jar #(jtds.jar depends on jcifs.jar)
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
test it:
set serveroutput on;
--test jcursor
declare
v_cursororajdbclink_o2a.jcursor:= orajdbclink_o2a.jcursor('selectcol1, col2, col5 from sqlservertable','MYSQLSRV',3);
begin
Weblogic Cannot Load Driver Class Net.sourceforge.jtds.jdbc.driver For Datasource
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;
Connected to:
Oracle Database 10g Release 10.2.0.2.0 - Production
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
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
Holger czukay persian love. 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
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
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.
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
Download the orajdbclink_o2a.zip (oracle-to-any) file
unzip in on a computer that has an oracle client installed and can reach the target Oracle server or directly on the oracle server
cd orajdbclink_o2a
sqlplus 'sys/@ as sysdba' @initoracletoany.sql #(when prompted for connstr write '@' or live it blank if you are on the server)
loadjava -resolve -verbose -user orajdbclink_o2a/orajdbclink_o2a@ jcifs-xx.jar jtds-xx.jar #(jtds.jar depends on jcifs.jar)
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
test it:
set serveroutput on;
--test jcursor
declare
v_cursororajdbclink_o2a.jcursor:= orajdbclink_o2a.jcursor('selectcol1, col2, col5 from sqlservertable','MYSQLSRV',3);
begin
Weblogic Cannot Load Driver Class Net.sourceforge.jtds.jdbc.driver For Datasource
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.
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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;
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;
Cannot Load Jdbc 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));
Cannot Load Driver Class Net.sourceforge.jtds.jdbc.driver Spring Boot
end;
For those who wants to useoracle-to-oracle
Download the orajdbclink_o2o.zip (oracle-to-oracle) file
unzip in on a computer that has an oracle client installed and can reach the target Oracle server or directly on the oracle server
cd orajdbclink_o2o
sqlplus 'sys/@ as sysdba' @initoracletooracle.sql #(when prompted for connstr write '@' or live it blank if you are on the server)
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
test it as of orajdbclink_o2a
Troubleshooting
If you get any other problem please submit a support request:
About
orajdbclink is developed by Andrea A.A. Gariboldi
Driver Class Java
mailto: andrea.gariboldi gmail.com
Cannot Load Jdbc Driver Class 'net.sourceforge.jtds.jdbc.driver' Jmeter
