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‎java/ojvm/TrimLob-Readme.txt

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TrimLob Readme
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==============
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The goal of this code sample is to contrast the performance of the same java code
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running as a stand-alone JDBC code running outside the database, and used as Java stored
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procedure running directly in your database session, using OJVM.
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1/ Create an empty table with a Varchar2, BLOB, and CLOB columns, using the
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TrimLob.sql script (from a SQL*Plus session)
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2/ Edit and compile the Java class and execute using it as stand-alone JDBC code:
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javac TrimLob.java
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java classpath %CLASSPATH% TrimLob
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3/ Execute TrimLobSP.sql (from a SQL*Plus session), this creates a Java source directly
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in the database, compiles, publishes/exposes to SQL, executes it in the database, and displays the results.

‎java/ojvm/TrimLob.java

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/*
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/------------------------------------------------------------------------------
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/ Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
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/
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/ Portions Copyright 2006-2015, Kuassi Mensah. All rights reserved.
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/
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/
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/------------------------------------------------------------------------------
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/ DESCRIPTION
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/ This sample shows basic BLOB/CLOB operations. It drops, creates, and populates a basic_lob_table
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/ with blob, clob data types columns then fetches the rows and trim both LOB and CLOB
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*/
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// Need to import the java.sql package to use JDBC
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import java.sql.*;
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/*
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* Need to import the oracle.sql package to use
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* oracle.sql.BLOB
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*/
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import oracle.sql.*;
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public class TrimLob
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{
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public static void main (String args []) throws SQLException {
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Connection conn;
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/*
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* Where is your code running: in the database or outside?
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*/
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if (System.getProperty("oracle.jserver.version") != null)
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{
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/*
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* You are in the database, already connected, use the default
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* connection
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*/
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conn = DriverManager.getConnection("jdbc:default:connection:");
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}
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else
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{
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/*
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* You are not in the database, you need to connect to
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* the database
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*/
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DriverManager.registerDriver(new oracle.jdbc.OracleDriver());
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conn =
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DriverManager.getConnection("jdbc:oracle:thin:@localhost:1522/orcl", "scott",
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"tiger");
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}
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long t0,t1;
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/*
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* auto commit is off (not suported)by default in OracleJVM
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* It's faster with JDBC when auto commit is off
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*/
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conn.setAutoCommit (false);
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t0=System.currentTimeMillis();
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// Create a Statement
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Statement stmt = conn.createStatement ();
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// Make sure the table is empty
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stmt.execute("delete from basic_lob_table");
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stmt.execute("commit");
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// Populate the table
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stmt.execute ("insert into basic_lob_table values ('first', " +
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"'010101010101010101010101010101', " +
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"'one.two.three.four.five.six.seven')");
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stmt.execute ("insert into basic_lob_table values ('second', " +
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"'0202020202020202020202020202020202020202', " +
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"'two.three.four.five.six.seven.eight.nine.ten')");
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/*
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* Retive Lobs and modify contents; this can be done by doing
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* "select ... for update", but "autocommit" is turned off and
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* the previous "create table" statement already locks the table
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*/
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ResultSet rset = stmt.executeQuery
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("select * from basic_lob_table for update");
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while (rset.next ())
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{
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// Get the lobs
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BLOB blob = (BLOB) rset.getObject (2);
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CLOB clob = (CLOB) rset.getObject (3);
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// Show the original lob length
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System.out.println ("Show the original lob length");
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System.out.println ("blob.length()="+blob.length());
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System.out.println ("clob.length()="+clob.length());
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// Trim the lobs
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System.out.println ("Trim the lob to legnth = 6");
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blob.truncate (6);
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clob.truncate (6);
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// Show the lob length after trim()
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System.out.println ("Show the lob length after trim()");
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System.out.println ("blob.length()="+blob.length());
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System.out.println ("clob.length()="+clob.length());
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}
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// Close the ResultSet and Commit changes
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rset.close ();
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stmt.execute("commit");
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// Close the Statement
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stmt.close ();
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t1=System.currentTimeMillis();
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System.out.println ("====> Duration: "+(int)(t1-t0)+ "Milliseconds");
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// Close the connection
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conn.close ();
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}
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}

‎java/ojvm/TrimLob.sql

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REM replace scott/tiger with you database username/password
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REM
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connect scott/tiger;
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drop table basic_lob_table;
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create table basic_lob_table (x varchar2 (30), b blob, c clob);

‎java/ojvm/TrimLobSp.sql

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create or replace java source named TrimLob as
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/*
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* This SQL script generated a Java code performing BLOB/CLOB operations.
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* The goal is to show Java in the database and contrat its performance with the same code
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* running as a client-side or stand-alone JDBC code.
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*/
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// You need to import the java.sql package to use JDBC
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import java.sql.*;
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/*
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* You need to import the oracle.sql package to use
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* oracle.sql.BLOB
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*/
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import oracle.sql.*;
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public class TrimLob
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{
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public static void main (String args []) throws SQLException {
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Connection conn;
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/*
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* Where is your code running: in the database or outside?
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*/
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if (System.getProperty("oracle.jserver.version") != null)
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{
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/*
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* You are in the database, already connected, use the default
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* connection
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*/
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conn = DriverManager.getConnection("jdbc:default:connection:");
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}
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else
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{
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/*
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* You are not in the database, you need to connect to
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* the database
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*/
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DriverManager.registerDriver(new oracle.jdbc.OracleDriver());
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conn =
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DriverManager.getConnection("jdbc:oracle:thin:", "scott",
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"tiger");
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}
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long t0,t1;
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/*
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* auto commit is off by default in OracleJVM (not supported)
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* It's faster with JDBC when auto commit is off
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*/
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conn.setAutoCommit (false);
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t0=System.currentTimeMillis();
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// Create a Statement
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Statement stmt = conn.createStatement ();
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// clean up
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try
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{
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stmt.execute ("drop table basic_lob_table");
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}
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catch (SQLException e)
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{
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// An exception could be raised here if the
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// table did not exist already.
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}
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// Create a table containing a BLOB and a CLOB
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stmt.execute ("create table basic_lob_table (x varchar2 (30), " +
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"b blob, c clob)");
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// Populate the table
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stmt.execute ("insert into basic_lob_table values ('first', " +
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"'010101010101010101010101010101', " +
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"'one.two.three.four.five.six.seven')");
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stmt.execute ("insert into basic_lob_table values ('second', " +
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"'0202020202020202020202020202020202020202', " +
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"'two.three.four.five.six.seven.eight.nine.ten')");
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/*
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* Retive Lobs and modify contents; this can be done by doing
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* "select ... for update", but "autocommit" is turned off and
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* the previous "create table" statement already locks the table
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*/
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ResultSet rset = stmt.executeQuery
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("select * from basic_lob_table");
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while (rset.next ())
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{
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// Get the lobs
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BLOB blob = (BLOB) rset.getObject (2);
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CLOB clob = (CLOB) rset.getObject (3);
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// Show the original lob length
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System.out.println ("Show the original lob length");
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System.out.println ("blob.length()="+blob.length());
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System.out.println ("clob.length()="+clob.length());
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// Trim the lobs
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System.out.println ("Trim the lob to legnth = 6");
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blob.trim (6);
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clob.trim (6);
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// Show the lob length after trim()
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System.out.println ("Show the lob length after trim()");
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System.out.println ("blob.length()="+blob.length());
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System.out.println ("clob.length()="+clob.length());
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}
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// Close the ResultSet
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rset.close ();
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// Close the Statement
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stmt.close ();
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t1=System.currentTimeMillis();
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System.out.println ("====> Duration: "+(int)(t1-t0)+ "Milliseconds");
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// Close the connection
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conn.close ();
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}
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}
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/
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show errors;
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alter java source TrimLob compile;
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show errors;
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create or replace procedure TrimLobSp as
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language java name 'TrimLob.main(java.lang.String[])';
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/
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show errors;
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set serveroutput on
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call dbms_java.set_output(50000);
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call TrimLobSp();
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