Example usage for java.lang Class forName

List of usage examples for java.lang Class forName

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Introduction

In this page you can find the example usage for java.lang Class forName.

Prototype

@CallerSensitive
public static Class<?> forName(String className) throws ClassNotFoundException

Source Link

Document

Returns the Class object associated with the class or interface with the given string name.

Usage

From source file:InsertRow.java

public static void main(String args[]) {

    String url = "jdbc:mySubprotocol:myDataSource";
    Connection con;//w w w.j  a va  2 s .c om
    Statement stmt;
    String query = "select COF_NAME, PRICE from COFFEES";

    try {

        Class.forName("myDriver.ClassName");

    } catch (java.lang.ClassNotFoundException e) {
        System.err.print("ClassNotFoundException: ");
        System.err.println(e.getMessage());
    }

    try {

        con = DriverManager.getConnection(url, "myLogin", "myPassword");

        stmt = con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE);
        ResultSet uprs = stmt.executeQuery("SELECT * FROM COFFEES");

        uprs.moveToInsertRow();

        uprs.updateString("COF_NAME", "Kona");
        uprs.updateInt("SUP_ID", 150);
        uprs.updateFloat("PRICE", 10.99f);
        uprs.updateInt("SALES", 0);
        uprs.updateInt("TOTAL", 0);

        uprs.insertRow();
        uprs.beforeFirst();

        System.out.println("Table COFFEES after insertion:");
        while (uprs.next()) {
            String s = uprs.getString("COF_NAME");
            int sup = uprs.getInt("SUP_ID");
            float f = uprs.getFloat("PRICE");
            int sales = uprs.getInt("SALES");
            int t = uprs.getInt("TOTAL");
            System.out.print(s + "   " + sup + "   " + f + "   ");
            System.out.println(sales + "   " + t);
        }

        uprs.close();
        stmt.close();
        con.close();

    } catch (SQLException ex) {
        System.err.println("SQLException: " + ex.getMessage());
    }
}

From source file:PrintColumns.java

public static void main(String args[]) {

    String url = "jdbc:mySubprotocol:myDataSource";
    Connection con;// w  w w  .jav a2s .  c o m
    String query = "select * from COFFEES";
    Statement stmt;

    try {
        Class.forName("myDriver.ClassName");

    } catch (java.lang.ClassNotFoundException e) {
        System.err.print("ClassNotFoundException: ");
        System.err.println(e.getMessage());
    }

    try {
        con = DriverManager.getConnection(url, "myLogin", "myPassword");

        stmt = con.createStatement();

        ResultSet rs = stmt.executeQuery(query);
        ResultSetMetaData rsmd = rs.getMetaData();

        PrintColumnTypes.printColTypes(rsmd);
        System.out.println("");

        int numberOfColumns = rsmd.getColumnCount();

        for (int i = 1; i <= numberOfColumns; i++) {
            if (i > 1)
                System.out.print(",  ");
            String columnName = rsmd.getColumnName(i);
            System.out.print(columnName);
        }
        System.out.println("");

        while (rs.next()) {
            for (int i = 1; i <= numberOfColumns; i++) {
                if (i > 1)
                    System.out.print(",  ");
                String columnValue = rs.getString(i);
                System.out.print(columnValue);
            }
            System.out.println("");
        }

        stmt.close();
        con.close();
    } catch (SQLException ex) {
        System.err.print("SQLException: ");
        System.err.println(ex.getMessage());
    }
}

From source file:Deet.java

public static void main(String... args) {
    if (args.length != 4) {
        err.format("Usage: java Deet <classname> <langauge> <country> <variant>%n");
        return;/*w  w w  .  j av  a  2s .  co m*/
    }

    try {
        Class<?> c = Class.forName(args[0]);
        Object t = c.newInstance();

        Method[] allMethods = c.getDeclaredMethods();
        for (Method m : allMethods) {
            String mname = m.getName();
            if (!mname.startsWith("test") || (m.getGenericReturnType() != boolean.class)) {
                continue;
            }
            Type[] pType = m.getGenericParameterTypes();
            if ((pType.length != 1) || Locale.class.isAssignableFrom(pType[0].getClass())) {
                continue;
            }

            out.format("invoking %s()%n", mname);
            try {
                m.setAccessible(true);
                Object o = m.invoke(t, new Locale(args[1], args[2], args[3]));
                out.format("%s() returned %b%n", mname, (Boolean) o);

                // Handle any exceptions thrown by method to be invoked.
            } catch (InvocationTargetException x) {
                Throwable cause = x.getCause();
                err.format("invocation of %s failed: %s%n", mname, cause.getMessage());
            }
        }

        // production code should handle these exceptions more gracefully
    } catch (ClassNotFoundException x) {
        x.printStackTrace();
    } catch (InstantiationException x) {
        x.printStackTrace();
    } catch (IllegalAccessException x) {
        x.printStackTrace();
    }
}

From source file:Connect.java

public static void main(String[] av) {
    String dbURL = "jdbc:odbc:Companies";
    try {//from  w  w  w . ja  va 2  s  . c  o m
        // Load the jdbc-odbc bridge driver
        Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");

        // Enable logging
        DriverManager.setLogWriter(new PrintWriter((System.err)));

        System.out.println("Getting Connection");
        Connection conn = DriverManager.getConnection(dbURL, "ian", ""); // user,
        // passwd

        // If a SQLWarning object is available, print its
        // warning(s). There may be multiple warnings chained.

        SQLWarning warn = conn.getWarnings();
        while (warn != null) {
            System.out.println("SQLState: " + warn.getSQLState());
            System.out.println("Message:  " + warn.getMessage());
            System.out.println("Vendor:   " + warn.getErrorCode());
            System.out.println("");
            warn = warn.getNextWarning();
        }

        // Do something with the connection here...

        conn.close(); // All done with that DB connection

    } catch (ClassNotFoundException e) {
        System.out.println("Can't load driver " + e);
    } catch (SQLException e) {
        System.out.println("Database access failed " + e);
    }
}

From source file:net.big_oh.common.jdbc.JdbcProxyExerciser.java

/**
 * <p>/*from  w  w  w . jav  a  2s. c  o  m*/
 * Use main method as a driver that exercises one of the example
 * JdbcDriverProxy implementations.
 * </p>
 * <p>
 * This main method expect to interact with a Postgres database named
 * 'JdbcProxyExerciser' that has a single table: <br/>
 * CREATE TABLE TEST_TABLE ( TEST_COLUMN VARCHAR(80), PRIMARY KEY
 * (TEST_COLUMN) );
 * </p>
 * 
 * @param args
 * @throws SQLException
 * @throws ClassNotFoundException
 */
public static void main(String[] args) throws SQLException, ClassNotFoundException {
    Class.forName("net.big_oh.common.jdbc.JdbcDriverProxy");

    String url = JdbcDriverProxy.class.getSimpleName() + ":" + "jdbc:postgresql://localhost:5432/"
            + JdbcProxyExerciser.class.getSimpleName();

    Connection con = DriverManager.getConnection(url, "davewingate", "ahechospechos");

    try {

        exerciseRegularInsert(con);

        exerciseBatchInsert(con);

        exercisePreparedBatchInsert(con);

        exerciseRegularSelect(con);

        exercisePreparedSelect(con);

    } finally {
        cleanOutTestTable(con);
    }

}

From source file:Main.java

public static void main(String[] args) throws Exception {
    CachedRowSet rs;/*from   www  .  j  a  v  a2 s  . c  o m*/

    // Create the class with class.forName to avoid importing
    // from the unsupported com.sun packages.
    Class c = Class.forName(ROWSET_IMPL_CLASS);
    rs = (CachedRowSet) c.newInstance();

    rs.setUrl("jdbc:postgresql:tmclub");
    rs.setUsername("ian");
    rs.setPassword("secret");

    rs.setCommand("select * from members where name like ?");
    rs.setString(1, "I%");

    // This will cause the RowSet to connect, fetch its data, and
    // disconnect
    rs.execute();

    // Some time later, the client tries to do something.

    // Suppose we want to update data:
    while (rs.next()) {
        if (rs.getInt("id") == 42) {
            rs.setString(1, "Marvin");
            rs.updateRow(); // Normal JDBC

            // This additional call tells the CachedRowSet to connect
            // to its database and send the updated data back.
            rs.acceptChanges();
        }
    }

    // If we're all done...
    rs.close();
}

From source file:BatchUpdate.java

public static void main(String args[]) throws SQLException {

    ResultSet rs = null;/*from  ww  w .ja v a2  s  .  c  o m*/
    PreparedStatement ps = null;

    String url = "jdbc:mySubprotocol:myDataSource";

    Connection con;
    Statement stmt;
    try {

        Class.forName("myDriver.ClassName");

    } catch (java.lang.ClassNotFoundException e) {
        System.err.print("ClassNotFoundException: ");
        System.err.println(e.getMessage());
    }

    try {

        con = DriverManager.getConnection(url, "myLogin", "myPassword");
        con.setAutoCommit(false);

        stmt = con.createStatement();

        stmt.addBatch("INSERT INTO COFFEES " + "VALUES('Amaretto', 49, 9.99, 0, 0)");
        stmt.addBatch("INSERT INTO COFFEES " + "VALUES('Hazelnut', 49, 9.99, 0, 0)");
        stmt.addBatch("INSERT INTO COFFEES " + "VALUES('Amaretto_decaf', 49, 10.99, 0, 0)");
        stmt.addBatch("INSERT INTO COFFEES " + "VALUES('Hazelnut_decaf', 49, 10.99, 0, 0)");

        int[] updateCounts = stmt.executeBatch();
        con.commit();
        con.setAutoCommit(true);

        ResultSet uprs = stmt.executeQuery("SELECT * FROM COFFEES");

        System.out.println("Table COFFEES after insertion:");
        while (uprs.next()) {
            String name = uprs.getString("COF_NAME");
            int id = uprs.getInt("SUP_ID");
            float price = uprs.getFloat("PRICE");
            int sales = uprs.getInt("SALES");
            int total = uprs.getInt("TOTAL");
            System.out.print(name + "   " + id + "   " + price);
            System.out.println("   " + sales + "   " + total);
        }

        uprs.close();
        stmt.close();
        con.close();

    } catch (BatchUpdateException b) {
        System.err.println("-----BatchUpdateException-----");
        System.err.println("SQLState:  " + b.getSQLState());
        System.err.println("Message:  " + b.getMessage());
        System.err.println("Vendor:  " + b.getErrorCode());
        System.err.print("Update counts:  ");
        int[] updateCounts = b.getUpdateCounts();
        for (int i = 0; i < updateCounts.length; i++) {
            System.err.print(updateCounts[i] + "   ");
        }
        System.err.println("");

    } catch (SQLException ex) {
        System.err.println("-----SQLException-----");
        System.err.println("SQLState:  " + ex.getSQLState());
        System.err.println("Message:  " + ex.getMessage());
        System.err.println("Vendor:  " + ex.getErrorCode());
    }
}

From source file:InsertStores.java

public static void main(String args[]) {

    String url = "jdbc:mySubprotocol:myDataSource";
    Connection con;/*  w  ww. ja  va 2  s.c o m*/
    Statement stmt;
    try {
        Class.forName("myDriver.ClassName");

    } catch (java.lang.ClassNotFoundException e) {
        System.err.print("ClassNotFoundException: ");
        System.err.println(e.getMessage());
    }

    try {

        con = DriverManager.getConnection(url, "myLogin", "myPassword");

        stmt = con.createStatement();
        con.setAutoCommit(false);

        String insertStore1 = "INSERT INTO STORES VALUES (" + "100001, "
                + "ADDRESS(888, 'Main_Street', 'Rancho_Alegre', " + "'CA', '94049'), "
                + "COF_ARRAY('Colombian', 'French_Roast', 'Espresso', "
                + "'Colombian_Decaf', 'French_Roast_Decaf'), "
                + "(SELECT OID FROM MANAGERS WHERE MGR_ID = 000001))";

        stmt.addBatch(insertStore1);

        String insertStore2 = "INSERT INTO STORES VALUES (" + "100002, "
                + "ADDRESS(1560, 'Alder', 'Ochos_Pinos', " + "'CA', '94049'), "
                + "COF_ARRAY('Colombian', 'French_Roast', 'Espresso', "
                + "'Colombian_Decaf', 'French_Roast_Decaf', " + "'Kona', 'Kona_Decaf'), "
                + "(SELECT OID FROM MANAGERS WHERE MGR_ID = 000001))";

        stmt.addBatch(insertStore2);

        String insertStore3 = "INSERT INTO STORES VALUES (" + "100003, "
                + "ADDRESS(4344, 'First_Street', 'Verona', " + "'CA', '94545'), "
                + "COF_ARRAY('Colombian', 'French_Roast', 'Espresso', "
                + "'Colombian_Decaf', 'French_Roast_Decaf', " + "'Kona', 'Kona_Decaf'), "
                + "(SELECT OID FROM MANAGERS WHERE MGR_ID = 000002))";

        stmt.addBatch(insertStore3);

        String insertStore4 = "INSERT INTO STORES VALUES (" + "100004, "
                + "ADDRESS(321, 'Sandy_Way', 'La_Playa', " + "'CA', '94544'), "
                + "COF_ARRAY('Colombian', 'French_Roast', 'Espresso', "
                + "'Colombian_Decaf', 'French_Roast_Decaf', " + "'Kona', 'Kona_Decaf'), "
                + "(SELECT OID FROM MANAGERS WHERE MGR_ID = 000002))";

        stmt.addBatch(insertStore4);

        String insertStore5 = "INSERT INTO STORES VALUES (" + "100005, "
                + "ADDRESS(1000, 'Clover_Road', 'Happyville', " + "'CA', '90566'), "
                + "COF_ARRAY('Colombian', 'French_Roast', 'Espresso', "
                + "'Colombian_Decaf', 'French_Roast_Decaf'), "
                + "(SELECT OID FROM MANAGERS WHERE MGR_ID = 000003))";

        stmt.addBatch(insertStore5);

        int[] updateCounts = stmt.executeBatch();

        ResultSet rs = stmt.executeQuery("SELECT * FROM STORES");

        System.out.println("Table STORES after insertion:");
        System.out.println("STORE_NO  LOCATION          COF_TYPE     MGR");
        while (rs.next()) {
            int storeNo = rs.getInt("STORE_NO");
            Struct location = (Struct) rs.getObject("LOCATION");
            Object[] locAttrs = location.getAttributes();
            Array coffeeTypes = rs.getArray("COF_TYPE");
            String[] cofTypes = (String[]) coffeeTypes.getArray();

            Ref managerRef = rs.getRef("MGR");
            PreparedStatement pstmt = con.prepareStatement("SELECT MANAGER FROM MANAGERS WHERE OID = ?");
            pstmt.setRef(1, managerRef);
            ResultSet rs2 = pstmt.executeQuery();
            rs2.next();
            Struct manager = (Struct) rs2.getObject("MANAGER");
            Object[] manAttrs = manager.getAttributes();

            System.out.print(storeNo + "   ");
            System.out.print(locAttrs[0] + " " + locAttrs[1] + " " + locAttrs[2] + ", " + locAttrs[3] + "  "
                    + locAttrs[4] + " ");
            for (int i = 0; i < cofTypes.length; i++)
                System.out.print(cofTypes[i] + " ");
            System.out.println(manAttrs[1] + ", " + manAttrs[2]);

            rs2.close();
            pstmt.close();
        }

        rs.close();
        stmt.close();
        con.close();

    } catch (BatchUpdateException b) {
        System.err.println("-----BatchUpdateException-----");
        System.err.println("SQLState:  " + b.getSQLState());
        System.err.println("Message:  " + b.getMessage());
        System.err.println("Vendor:  " + b.getErrorCode());
        System.err.print("Update counts:  ");
        int[] updateCounts = b.getUpdateCounts();
        for (int i = 0; i < updateCounts.length; i++) {
            System.err.print(updateCounts[i] + "   ");
        }
        System.err.println("");

    } catch (SQLException ex) {
        System.err.println("SQLException: " + ex.getMessage());
        System.err.println("SQLState:  " + ex.getSQLState());
        System.err.println("Message:  " + ex.getMessage());
        System.err.println("Vendor:  " + ex.getErrorCode());
    }
}

From source file:GetParamMetaData.java

public static void main(String args[]) {

    String url = "jdbc:mySubprotocol:myDataSource";

    Connection con;//from   w w  w. j a  va 2  s.  c  o  m
    PreparedStatement pstmt;
    ParameterMetaData pmd;

    String sql = "UPDATE COFFEES SET SALES = ? " + "WHERE COF_NAME = ?";

    try {

        Class.forName("myDriver.ClassName");

    } catch (java.lang.ClassNotFoundException e) {
        System.err.print("ClassNotFoundException: ");
        System.err.println(e.getMessage());
    }

    try {

        con = DriverManager.getConnection(url, "myLogin", "myPassword");

        pstmt = con.prepareStatement(sql);

        pmd = pstmt.getParameterMetaData();

        int totalDigits = pmd.getPrecision(1);
        int digitsAfterDecimal = pmd.getScale(1);
        boolean b = pmd.isSigned(1);
        System.out.println("The first parameter ");
        System.out.println("    has precision " + totalDigits);
        System.out.println("    has scale " + digitsAfterDecimal);
        System.out.println("    may be a signed number " + b);

        int count = pmd.getParameterCount();
        System.out.println("count is " + count);

        for (int i = 1; i <= count; i++) {
            int type = pmd.getParameterType(i);
            String typeName = pmd.getParameterTypeName(i);
            System.out.println("Parameter " + i + ":");
            System.out.println("    type is " + type);
            System.out.println("    type name is " + typeName);
        }

        pstmt.close();
        con.close();

    } catch (Exception e) {
        e.printStackTrace();

    }
}

From source file:CreateCoffees.java

public static void main(String args[]) {

    String url = "jdbc:mySubprotocol:myDataSource";
    Connection con;// w  w  w .  j a va 2 s. c o  m
    String createString;
    createString = "create table COFFEES " + "(COF_NAME varchar(32), " + "SUP_ID int, " + "PRICE float, "
            + "SALES int, " + "TOTAL int)";
    Statement stmt;

    try {
        Class.forName("myDriver.ClassName");

    } catch (java.lang.ClassNotFoundException e) {
        System.err.print("ClassNotFoundException: ");
        System.err.println(e.getMessage());
    }

    try {
        con = DriverManager.getConnection(url, "myLogin", "myPassword");

        stmt = con.createStatement();
        stmt.executeUpdate(createString);

        stmt.close();
        con.close();

    } catch (SQLException ex) {
        System.err.println("SQLException: " + ex.getMessage());
    }
}