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Thread: Prepared Statement exceptions please help

  1. #1
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    Default Prepared Statement exceptions please help

    exception
    java.lang.NullPointerException
    at jdbcstatements.Insertion.main(Insertion.java:37)
    Exception in thread "main" java.lang.NullPointerException
    at jdbcstatements.Insertion.main(Insertion.java:50)
    my code
    package jdbcstatements;
    import java.sql.Connection;
    import java.sql.DriverManager;
    import java.sql.PreparedStatement;
     
    import java.sql.SQLException;
     
    import oracle.jdbc.OraclePreparedStatement;
     
     
     
    public class Insertion {
     
    	/**
    	 * @param args
    	 * @throws SQLException 
    	 * 
    	 */
    	public static Connection getConnection()throws Exception{
     
    	      Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();
    	      String url="jdbc:oracle:thin:@localhost:1521:orcl";
     
    	    Connection  con=DriverManager.getConnection(   url,   "scott", "tiger");
    	      System.out.println("connection created");
    	 return con;
    	}
    	public static void main(String[] args) throws SQLException {
     
    		Connection con=null;
    		OraclePreparedStatement pstmt = null;
     
    		try {
     
    		      String query = "insert into EMP(ENAME, JOB, SAL) values(?, ?, ?)";
    System.out.println("insert the record");
    		      pstmt = (OraclePreparedStatement) con.prepareStatement(query); // create a statement
     
    		      pstmt.setString(1, "Navatha"); // set input parameter 2
    		      pstmt.setString(2, "Manger"); // set input parameter 3
    		      pstmt.setString(3, "3000");
    		      pstmt.executeUpdate();
     
     
     
     
    		   } catch(Exception e){e.printStackTrace();}
     
    		finally {
    		      pstmt.close();
    		      con.close();
    		    }
    	}
     
    }
    Last edited by copeg; November 11th, 2010 at 03:03 PM.


  2. #2
    Administrator copeg's Avatar
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    Default Re: Prepared Statement exceptions please help

    Connection con=null;
    ...
    pstmt = (OraclePreparedStatement) con.prepareStatement(query); // create a statement

    Where is your connection established (eg instantiated)?

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    Default Re: Prepared Statement exceptions please help

    Connection con=DriverManager.getConnection( url, "scott", "tiger");

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    Default Re: Prepared Statement exceptions please help

    Quote Originally Posted by nrao View Post
    Connection con=DriverManager.getConnection( url, "scott", "tiger");
    Are you sure about that? I see one place where you local connection in main is assigned
    Connection con=null;

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    Default Re: Prepared Statement exceptions please help

    it is in getConnection method above

  6. #6
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    Default Re: Prepared Statement exceptions please help

    Quote Originally Posted by nrao View Post
    it is in getConnection method above
    So? At what point do you call getConnection()? If that still doesn't make sense, you should really re-visit the basics of the java language: Learning the Java Language

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