Example usage for javax.sql.rowset WebRowSet beforeFirst

Introduction

In this page you can find the example usage for javax.sql.rowset WebRowSet beforeFirst.

Prototype

void beforeFirst() throws SQLException;

Source Link

Document

Moves the cursor to the front of this ResultSet object, just before the first row.

Usage

From source file:com.oracle.tutorial.jdbc.WebRowSetSample.java

public void testWebRowSet() throws SQLException, IOException {
    FileReader fReader = null;/*from  ww  w  .j a  v  a2  s  .  co m*/
    FileWriter fWriter = null;
    String priceListFileName = "pricelist.xml";
    int[] keyCols = { 1 };
    WebRowSet priceList = new WebRowSetImpl();

    priceList.setUsername(settings.userName);
    priceList.setPassword(settings.password);
    priceList.setUrl(settings.urlString);
    priceList.setCommand("select COF_NAME, PRICE from COFFEES");
    priceList.setKeyColumns(keyCols);

    // Populate the WebRowSet
    priceList.execute();
    System.out.println("Size of the WebRowSet is: " + priceList.size());

    // Insert a new row
    priceList.moveToInsertRow();
    priceList.updateString("COF_NAME", "Kona");
    priceList.updateFloat("PRICE", 8.99f);
    priceList.insertRow();
    priceList.moveToCurrentRow();
    System.out.println("New row inserted");
    System.out.println("Size of the WebRowSet is: " + priceList.size());

    //Delete the row with "Espresso"
    priceList.beforeFirst();
    while (priceList.next()) {
        if (priceList.getString(1).equals("Espresso")) {
            System.out.println("Deleting row with Espresso...");
            priceList.deleteRow();
            break;
        }
    }

    // Update price of Colombian
    priceList.beforeFirst();
    while (priceList.next()) {
        if (priceList.getString(1).equals("Colombian")) {
            System.out.println("Updating row with Colombian...");
            priceList.updateFloat(2, 6.99f);
            priceList.updateRow();
            break;
        }
    }

    int size1 = priceList.size();
    fWriter = new FileWriter(priceListFileName);
    priceList.writeXml(fWriter);
    fWriter.flush();
    fWriter.close();

    // Create the receiving WebRowSet object
    WebRowSet receiver = new WebRowSetImpl();
    receiver.setUrl(settings.urlString);
    receiver.setUsername(settings.userName);
    receiver.setPassword(settings.password);

    //Now read the XML file.
    fReader = new FileReader(priceListFileName);
    receiver.readXml(fReader);
    int size2 = receiver.size();
    if (size1 == size2) {
        System.out.println("WebRowSet serialized and " + "deserialiazed properly");
    } else {
        System.out.println("Error....serializing/deserializng the WebRowSet");
    }
}

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