EMBEDDED SQL Pepper

WHICH LANGUAGES C Visual C++ Java Many, many more What is needed from the language: –Must know how to connect to oracle db –Must know how to format commands to oracle

How Java Knows Libraries with Oracle and array knowledge: –import java.sql.*; –import java.util.Enumeration; Environment variables: –setenv CLASSPATH ".:${ORACLE_HOME}/jdbc/lib/classes12.zip:$ {ORACLE_HOME}/jdbc/lib/nls_charset12.zip –setenv LD_LIBRARY_PATH "${ORACLE_HOME}/lib: ${ORACLE_HOME}/jdbc/lib"

Setting up Java to run on Panther This is initial setup that has nothing to do with Oracle: Path with: –/opt/IBMJava2-141/bin –/opt/IBMJava2-141/jre/bin –/usr/X11R6/bin

Environment – just plain oracle Unix Environment variables: –For Oracle to find its programs: setenv ORACLE_BASE /usr/users/db/oracle setenv ORACLE_HOME $ORACLE_BASE/OraHome1 –For Oracle to know which set of data: setenv ORACLE_SID adelphi

Environment – just plain oracle Path must include: –For Oracle: :$ORACLE_HOME/bin:$ORACLE_HOME

Viewing env variables env env | grep PATH See it in.cshrc and.mycshrc

Connecting to the Database final String tnspre = String user = "pepperk"; //edit this String pass = "123"; //edit this try { System.err.println("Registering driver..."); DriverManager.registerDriver (new oracle.jdbc.driver.OracleDriver()); System.err.println("Attempting connection..."); Connection x = DriverManager.getConnection(tnspre, user, pass); ………

Catching the error if connection fails } catch (SQLException se) { System.err.println("Caught an SQLException!"); se.printStackTrace(); System.err.println("Available drivers:"); Enumeration e = DriverManager.getDrivers(); while (e.hasMoreElements()) { System.err.println(e.nextElement()); }

Sending to Oracle System.err.println("Creating statement..."); Statement stmt = x.createStatement(); stmt.execute ("DROP TABLE jdbctest"); // note no semi –colon stmt.execute("CREATE TABLE jdbctest (text varchar2(127))"); stmt.execute("INSERT INTO jdbctest VALUES ('This is a test')");

Getting back from oracle Sent: ResultSet result = stmt.executeQuery("SELECT * FROM jdbctest"); // ResultSet's pointer initializes before the first row result.next(); System.out.println(result.getString("text")); //release the result variable space result.close(); // release the sql statement variable space x.close();

Compiling javac test.java >> creates classes java

Samples Simple Asking for user and password