Issue involving Trigger , PL/SQL Procedure & a Java stored procedure
- From: ramalingam.rangadoure@xxxxxxx
- To: oracle-l@xxxxxxxxxxxxx
- Date: Wed, 25 Feb 2004 19:26:24 +0530
Hi all,
Scenario:
We have an issue with PL/SQL Trigger involving another PL/SQL Procedure &
a Java stored procedure.
The trigger will be invoked when ever there is any transaction occurs on a
particular table. This calls a PL/SQL Procedure that inturn invokes a Java
stored procedure.
The Java stored procedure will reads the data from the table and write it
to a text file.
Issue:
The issue we are facing is that the Java stored procedure is unable to get
the latest changes made to the table, which invoked the trigger.
Example:
We have 4 records in the table. If we insert another record, then it
inturns fires the trigger and that calls the procedure and Java stored
procedure.
The Java stored procedure was able to select only the 4 records but not
the 5 record which has fired the trigger.
The event of the trigger is mentioned as "after insert/delete/update for
each row".
Attached the code for your reference.
Please let me know if anybody has a solution for this issue.
Thanks and Regards,
R. Rangadoure
************** TRIGGER *******
CREATE OR REPLACE TRIGGER "DEV1"."TR_JOBS" AFTER
INSERT
OR UPDATE
OR DELETE OF "COMMENTS", "DAY_OF_MONTH", "DAY_OF_WEEK", "FREQUENCY", "HOUR",
"JOB_ID", "MINUTE", "MONTH_OF_YEAR", "SCRIPT_ID", "STATE", "TIME_SETTINGS",
"USER_NAME" ON "DEV1"."T_DTJOBS" FOR EACH ROW sp_jobs;
******** PROCEDURE *************
CREATE OR REPLACE PROCEDURE "DEV1"."SP_JOBS" AS LANGUAGE JAVA
NAME 'BatchCreateCronJobFile.createCronJobsFile()';
******************** BatchCreateCronJobFile JAVA CLASS ***********8
import java.io.*;
import java.util.Vector;
import java.util.Calendar;
import java.sql.*;
/**
*
* Description : This class is triggered after t_dtjobs table is
modified.
* This class gets the active jobs data from DB and writes
it into the cronJobs File
* @Class name : BatchCreateCronJobFile
* @Version : 1.0
* @Author : Tata Consultancy Services
* Creation date : 21/02/2004
* Maintenance History
* Change Request Ref Date Modified Modified by Brief Description
*
*/
public class BatchCreateCronJobFile
{
/**
* Description : Gets the active jobs data from DB and writes it into
the cronJobs File
*/
public static boolean createCronJobsFile()
{
BufferedWriter l_bufferedWriter = null;
String record = null;
String s_fileNameWithPath = "c:\\test\\abc.txt";
BatchDBConnection batchDBConnection = new BatchDBConnection();
try
{
l_bufferedWriter = new BufferedWriter(new
FileWriter(new File(s_fileNameWithPath)));
ResultSet rset =
batchDBConnection.executeQuery("Select time_settings||' java BatchProcessJob
'||job_Id from t_dtJobs");
while (rset.next())
{
l_bufferedWriter.write(rset.getString(1));
l_bufferedWriter.newLine();
}
l_bufferedWriter.flush();
Statement stmt = rset.getStatement();
stmt.close();
}
catch(Exception e)
{
System.out.println("Exception is "+e);
return false;
}
return true;
}
/**
* Description : Default Constructor
*/
public BatchCreateCronJobFile()
{
}
public static void main (String args[])
{
BatchCreateCronJobFile batchCreateCronJobFile = new
BatchCreateCronJobFile();
boolean status =
batchCreateCronJobFile.createCronJobsFile();
}
}
********************* BatchDBConnection *************8
import java.io.PrintStream;
import java.sql.*;
import java.util.ArrayList;
import java.util.HashMap;
import javax.naming.InitialContext;
/**
*
* Description : This is a Database connection class used for getting
the connection
* @Class name : BatchDBConnection
* @Version : 1.0
* @Author : Tata Consultancy Services
* Creation date : 20/02/2004
* Maintenance History
* Change Request Ref Date Modified Modified by Brief Description
*
*/
class BatchDBConnection
{
/**
* Description : Creates and returns a connection to DB
*/
public Connection getConnectionToDB()
{
Connection conn = null;
try
{
String driverName = "oracle.jdbc.driver.OracleDriver";
Class.forName(driverName);
conn =
DriverManager.getConnection("jdbc:oracle:thin:@172.20.134.16:1521:1521",
"dev1", "dev1");
}
catch(Exception e)
{
System.out.println("Exception is "+e);
}
return conn;
}
/**
* Description : Executes a select query and return the ResultSet
*/
public ResultSet executeQuery(String query) throws Exception
{
Connection conn = getConnectionToDB();
Statement stmt = conn.createStatement();
ResultSet rset = stmt.executeQuery(query);
return rset;
}
/**
* Description : Executes an insert/update/delete query and return no
of rows affected
*/
public int executeUpdate(String query) throws Exception
{
Connection conn = getConnectionToDB();
Statement stmt = conn.createStatement();
int returnValue = stmt.executeUpdate(query);
return returnValue;
}
public static void main(String[] args)
{
System.out.println("Hello World!");
int noOfRowsUpdated=0;
int noOfColumns = 0;
int iter=0;
BatchDBConnection batchDBConnection = new BatchDBConnection();
try
{
ResultSet rset = batchDBConnection.executeQuery("select
* from t_dtJobs");
ResultSetMetaData rsmd = rset.getMetaData();
noOfColumns = rsmd.getColumnCount();
for(iter=1;iter<=noOfColumns;iter++)
{
System.out.print(rsmd.getColumnName(iter)+" "); // Print col 1
}
System.out.println();
while (rset.next())
{
for(iter=1;iter<=noOfColumns;iter++)
{
System.out.print(rset.getString(iter)+"
"); // Print col 1
}
System.out.println();
}
Statement stmt = rset.getStatement();
stmt.close();
}
catch(Exception e)
{
System.out.println("Exception is "+e);
}
System.out.println("Ending!");
}
}
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