Main.java Source code

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Here is the source code for Main.java

Source

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;

import javax.sql.RowSet;
import javax.sql.rowset.FilteredRowSet;
import javax.sql.rowset.Predicate;

import com.sun.rowset.FilteredRowSetImpl;

public class Main {
    public static void main(String[] args) throws Exception {
        Connection conn = getHSQLConnection();
        Statement st = conn.createStatement();
        st.executeUpdate("create table survey (id int,name varchar, age int);");
        st.executeUpdate("insert into survey (id,name,age ) values (1,'nameValue', 10)");

        FilteredRowSet frs = new FilteredRowSetImpl();
        frs.setUsername("sa");
        frs.setPassword("");
        frs.setUrl("jdbc:hsqldb:data/tutorial");
        frs.setCommand("SELECT id, name, age FROM survey");
        frs.execute();
        while (frs.next()) {
            System.out.println(frs.getRow() + " - " + frs.getString("id") + ":" + frs.getString("name") + ":"
                    + frs.getInt("age"));
        }
        AgeFilter filter = new AgeFilter(7, 10, 3);
        frs.beforeFirst();
        frs.setFilter(filter);
        while (frs.next()) {
            System.out.println(frs.getRow() + " - " + frs.getString("id") + ":" + frs.getString("name") + ":"
                    + frs.getInt("age"));
        }
        frs.beforeFirst();
        while (frs.next()) {
            System.out.println(frs.getRow() + " - " + frs.getString("id") + ":" + frs.getString("name") + ":"
                    + frs.getInt("age"));
        }
        frs.close();
        st.close();
        frs.close();
    }

    private static Connection getHSQLConnection() throws Exception {
        Class.forName("org.hsqldb.jdbcDriver");
        System.out.println("Driver Loaded.");
        String url = "jdbc:hsqldb:data/tutorial";
        return DriverManager.getConnection(url, "sa", "");
    }

    public static Connection getMySqlConnection() throws Exception {
        String driver = "org.gjt.mm.mysql.Driver";
        String url = "jdbc:mysql://localhost/demo2s";
        String username = "oost";
        String password = "oost";

        Class.forName(driver);
        Connection conn = DriverManager.getConnection(url, username, password);
        return conn;
    }

    public static Connection getOracleConnection() throws Exception {
        String driver = "oracle.jdbc.driver.OracleDriver";
        String url = "jdbc:oracle:thin:@localhost:1521:databaseName";
        String username = "userName";
        String password = "password";

        Class.forName(driver); // load Oracle driver
        Connection conn = DriverManager.getConnection(url, username, password);
        return conn;
    }
}

class AgeFilter implements Predicate {
    private int lowAge;

    private int highAge;

    private int columnIndex;

    private String columnName;

    public AgeFilter(int lowAge, int highAge, int columnIndex, String columnName) {
        this.lowAge = lowAge;
        this.highAge = highAge;
        this.columnName = columnName;
        this.columnIndex = columnIndex;
    }

    public AgeFilter(int lowAge, int highAge, int columnIndex) {
        this(lowAge, highAge, columnIndex, "age");
    }

    public boolean evaluate(Object value, String columnName) {
        boolean evaluation = true;
        if (columnName.equalsIgnoreCase(this.columnName)) {
            int columnValue = ((Integer) value).intValue();
            if ((columnValue >= this.lowAge) && (columnValue <= this.highAge)) {
                evaluation = true;
            } else {
                evaluation = false;
            }
        }
        return evaluation;
    }

    public boolean evaluate(Object value, int columnNumber) {
        boolean evaluation = true;
        if (columnIndex == columnNumber) {
            int columnValue = ((Integer) value).intValue();
            if ((columnValue >= this.lowAge) && (columnValue <= this.highAge)) {
                evaluation = true;
            } else {
                evaluation = false;
            }
        }
        return evaluation;
    }

    public boolean evaluate(RowSet rs) {
        if (rs == null) {
            return false;
        }

        FilteredRowSet frs = (FilteredRowSet) rs;
        boolean evaluation = false;
        try {
            int columnValue = frs.getInt(this.columnIndex);
            if ((columnValue >= this.lowAge) && (columnValue <= this.highAge)) {
                evaluation = true;
            }
        } catch (SQLException e) {
            return false;
        }
        return evaluation;
    }
}