Examples of javax.sql.rowset.JdbcRowSet

javax.sql.rowset.JdbcRowSet
The standard interface that all standard implementations of JdbcRowSet must implement.
1.0 Overview
A wrapper around a ResultSet object that makes it possible to use the result set as a JavaBeans™ component. Thus, a JdbcRowSet object can be one of the Beans that a tool makes available for composing an application. Because a JdbcRowSet is a connected rowset, that is, it continually maintains its connection to a database using a JDBC technology-enabled driver, it also effectively makes the driver a JavaBeans component.
Because it is always connected to its database, an instance of JdbcRowSet can simply take calls invoked on it and in turn call them on its ResultSet object. As a consequence, a result set can, for example, be a component in a Swing application.
Another advantage of a JdbcRowSet object is that it can be used to make a ResultSet object scrollable and updatable. All RowSet objects are by default scrollable and updatable. If the driver and database being used do not support scrolling and/or updating of result sets, an application can populate a JdbcRowSet object with the data of a ResultSet object and then operate on the JdbcRowSet object as if it were the ResultSet object.
2.0 Creating a JdbcRowSet Object
The reference implementation of the JdbcRowSet interface, JdbcRowSetImpl, provides an implementation of the default constructor. A new instance is initialized with default values, which can be set with new values as needed. A new instance is not really functional until its execute method is called. In general, this method does the following:
- establishes a connection with a database
- creates a PreparedStatement object and sets any of its placeholder parameters
- executes the statement to create a ResultSet object
If the execute method is successful, it will set the appropriate private JdbcRowSet fields with the following:
- a Connection object -- the connection between the rowset and the database
- a PreparedStatement object -- the query that produces the result set
- a ResultSet object -- the result set that the rowset's command produced and that is being made, in effect, a JavaBeans component
If these fields have not been set, meaning that the execute method has not executed successfully, no methods other than execute and close may be called on the rowset. All other public methods will throw an exception.
Before calling the execute method, however, the command and properties needed for establishing a connection must be set. The following code fragment creates a JdbcRowSetImpl object, sets the command and connection properties, sets the placeholder parameter, and then invokes the method execute.
```
 JdbcRowSetImpl jrs = new JdbcRowSetImpl(); jrs.setCommand("SELECT * FROM TITLES WHERE TYPE = ?"); jrs.setURL("jdbc:myDriver:myAttribute"); jrs.setUsername("cervantes"); jrs.setPassword("sancho"); jrs.setString(1, "BIOGRAPHY"); jrs.execute(); 
```
The variable jrs now represents an instance of JdbcRowSetImpl that is a thin wrapper around the ResultSet object containing all the rows in the table TITLES where the type of book is biography. At this point, operations called on jrs will affect the rows in the result set, which is effectively a JavaBeans component.
The implementation of the RowSet method execute in the JdbcRowSet reference implementation differs from that in the CachedRowSet™ reference implementation to account for the different requirements of connected and disconnected RowSet objects.
@author Jonathan Bruce

        assertTrue(rs.next());
        assertEquals(1, rs.getInt(1));
    }


    public void testGetRowSetWarnings() throws Exception {
        JdbcRowSet jrs = newJdbcRowSet();
        jrs.setCommand("SELECT * FROM USER_INFO");
        jrs.setUrl(DERBY_URL);
        jrs.execute();


        /*
         * TODO not sure when and how will cause RowSetWarning
         */
        assertNull(jrs.getRowSetWarnings());


        jrs.close();


        jrs = newJdbcRowSet();
        RowSetWarning warning = jrs.getRowSetWarnings();
        super.assertNull(warning);


        // TODO Try to produce warnings.


        jrs.close();
        // Checks for Exception after closing jrs.


        assertNull(rs.getWarnings());
        assertNull(jrs.getRowSetWarnings());
    }

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        assertNull(rs.getWarnings());
        assertNull(jrs.getRowSetWarnings());
    }


    public void testConstructor() throws Exception {
        JdbcRowSet jrs = newJdbcRowSet();
        try {
            jrs.absolute(3);
            fail("should throw SQLException");
        } catch (SQLException e) {
            // expected
        }
        jrs.addRowSetListener(new Listener());
        try {
            jrs.afterLast();
            fail("should throw SQLException");
        } catch (SQLException e) {
            // expected
        }
        try {
            jrs.beforeFirst();
            fail("should throw SQLException");
        } catch (SQLException e) {
            // expected
        }
        try {
            jrs.cancelRowUpdates();
            fail("should throw SQLException");
        } catch (SQLException e) {
            // expected
        }
        jrs.clearParameters();
        try {
            jrs.clearWarnings();
            fail("should throw SQLException");
        } catch (SQLException e) {
            // expected
        }
        jrs.close();


        // after close
        try {
            jrs.commit();
            fail("should throw NullPointerException");
        } catch (NullPointerException e) {
            // expected
        }
        try {
            jrs.deleteRow();
            fail("should throw SQLException");
        } catch (SQLException e) {
            // expected
        }
        try {
            jrs.findColumn("abc");
            fail("should throw SQLException");
        } catch (SQLException e) {
            // expected
        }
        try {
            jrs.first();
            fail("should throw SQLException");
        } catch (SQLException e) {
            // expected
        }
        try {
            jrs.getString(1);
            fail("should throw SQLException");
        } catch (SQLException e) {
            // expected
        }
        try {
            jrs.getAutoCommit();
            fail("should throw NullPointerException");
        } catch (NullPointerException e) {
            // expected
        }
        jrs.getCommand();
        try {
            jrs.getConcurrency();
            fail("should throw NullPointerException");
        } catch (NullPointerException e) {
            // expected
        }
        try {
            jrs.getCursorName();
            fail("should throw SQLException");
        } catch (SQLException e) {
            // expected
        }
        jrs.getDataSourceName();
        jrs.getEscapeProcessing();
        try {
            jrs.getFetchDirection();
            fail("should throw NullPointerException");
        } catch (NullPointerException e) {
            // expected
        }
        jrs.getFetchSize();
        try {
            jrs.getMatchColumnIndexes();
            fail("should throw SQLException");
        } catch (SQLException e) {
            // expected
        }
        try {
            jrs.getMatchColumnNames();
            fail("should throw SQLException");
        } catch (SQLException e) {
            // expected
        }
        jrs.getMaxFieldSize();
        jrs.getMaxRows();
        try {
            jrs.getMetaData();
            fail("should throw SQLException");
        } catch (SQLException e) {
            // expected
        }
        jrs.getPassword();
        jrs.getQueryTimeout();
        try {
            jrs.getRow();
            fail("should throw SQLException");
        } catch (SQLException e) {
            // expected
        }
        jrs.getRowSetWarnings();
        jrs.getShowDeleted();
        jrs.getStatement();
        jrs.getTransactionIsolation();
        jrs.getType();
        jrs.getTypeMap();
        jrs.getUrl();
        jrs.getUsername();
        try {
            jrs.getWarnings();
            fail("should throw SQLException");
        } catch (SQLException e) {
            // expected
        }
        try {
            jrs.insertRow();
            fail("should throw SQLException");
        } catch (SQLException e) {
            // expected
        }
        try {
            jrs.isAfterLast();
            fail("should throw SQLException");
        } catch (SQLException e) {
            // expected
        }
        try {
            jrs.isFirst();
            fail("should throw SQLException");
        } catch (SQLException e) {
            // expected
        }
        jrs.isReadOnly();
        try {
            jrs.moveToCurrentRow();
            fail("should throw SQLException");
        } catch (SQLException e) {
            // expected
        }
        try {
            jrs.moveToInsertRow();
            fail("should throw SQLException");
        } catch (SQLException e) {
            // expected
        }
        try {
            jrs.next();
            fail("should throw SQLException");
        } catch (SQLException e) {
            // expected
        }
    }

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            // expected, Invalid state
        }
    }


    public void testResult() throws Exception {
        JdbcRowSet jrs = newJdbcRowSet();
        assertTrue(jrs instanceof BaseRowSet);
        jrs.setCommand("select * from USER_INFO");
        jrs.setUrl(DERBY_URL);


        // before execute
        assertEquals(ResultSet.TYPE_SCROLL_INSENSITIVE, jrs.getType());
        assertTrue(jrs.getEscapeProcessing());


        assertEquals(Connection.TRANSACTION_READ_COMMITTED, jrs
                .getTransactionIsolation());


        try {
            assertEquals(ResultSet.FETCH_FORWARD, jrs.getFetchDirection());
            fail("Should throw NullPointerException");
        } catch (NullPointerException e) {
            // expected
        }


        assertEquals(0, jrs.getFetchSize());


        assertEquals(0, jrs.getMaxFieldSize());
        assertEquals(0, jrs.getMaxRows());


        assertEquals(0, jrs.getQueryTimeout());
        assertFalse(jrs.getShowDeleted());


        assertEquals(DERBY_URL, jrs.getUrl());
        assertNull(jrs.getUsername());
        assertNull(jrs.getPassword());


        jrs.execute();


        // after execute
        assertEquals(ResultSet.TYPE_SCROLL_INSENSITIVE, jrs.getType());
        assertTrue(jrs.getEscapeProcessing());


        assertEquals(Connection.TRANSACTION_READ_COMMITTED, jrs
                .getTransactionIsolation());


        assertEquals(ResultSet.FETCH_FORWARD, jrs.getFetchDirection());
        assertEquals(0, jrs.getFetchSize());


        assertEquals(0, jrs.getMaxFieldSize());
        assertEquals(0, jrs.getMaxRows());


        assertEquals(0, jrs.getQueryTimeout());
        assertFalse(jrs.getShowDeleted());


        assertEquals(DERBY_URL, jrs.getUrl());
        assertNull(jrs.getUsername());
        assertNull(jrs.getPassword());


        assertTrue(jrs.next());
        assertEquals(1, jrs.getInt(1));


        assertTrue(jrs.absolute(3));


        assertTrue(jrs.absolute(1));


        assertEquals(ResultSet.TYPE_FORWARD_ONLY, rs.getType());


        assertTrue(jrs instanceof BaseRowSet);


        jrs.close();
    }

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        jrs.close();
    }


    public void testCursorMove() throws Exception {
        insertMoreData(6);
        JdbcRowSet jrs = newJdbcRowSet();
        jrs.setUrl(DERBY_URL);
        jrs.setCommand("SELECT * FROM USER_INFO");
        jrs.execute();


        jrs.beforeFirst();
        assertTrue(jrs.isBeforeFirst());
        assertTrue(jrs.next());
        assertTrue(jrs.first());
        assertFalse(jrs.previous());
        assertTrue(jrs.isBeforeFirst());
        assertTrue(jrs.absolute(1));
        assertTrue(jrs.first());
        assertEquals(1, jrs.getInt(1));


        assertTrue(jrs.relative(3));
        assertEquals(4, jrs.getInt(1));
        assertTrue(jrs.previous());
        assertEquals(3, jrs.getInt(1));
        assertTrue(jrs.relative(-2));
        assertTrue(jrs.first());


        assertTrue(jrs.absolute(10));
        assertEquals(10, jrs.getInt(1));
        assertTrue(jrs.last());
        assertFalse(jrs.next());
        assertTrue(jrs.isAfterLast());


        assertTrue(jrs.relative(-2));
        assertEquals(9, jrs.getInt(1));
        jrs.afterLast();
        assertTrue(jrs.isAfterLast());


        assertTrue(jrs.absolute(-3));
        assertEquals(8, jrs.getInt(1));


        jrs.close();
    }

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        jrs.close();
    }


    public void testExecute() throws Exception {
        JdbcRowSet jrs = newJdbcRowSet();
        jrs.setUrl("bad url");


        try {
            jrs.execute();
            fail("Should SQLException");
        } catch (SQLException e) {
            // expected, No suitable driver
        }


        jrs = newJdbcRowSet();
        try {
            jrs.execute();
            fail("should throw NullPointerException");
        } catch (NullPointerException e) {
            // expected
        }
        jrs.setUrl(DERBY_URL);
        try {
            jrs.execute();
            fail("should throw SQLException");
        } catch (SQLException e) {
            // expected
        }
        /*
         * TODO It's really strange. setUrl(null) no affect here.
         */
        if (!"true".equals(System.getProperty("Testing Harmony"))) {
            jrs.setUrl(null);
            assertEquals(DERBY_URL, jrs.getUrl());
        }


        jrs.setCommand("SELECT * FROM USER_INFO");
        jrs.execute();
        assertTrue(jrs.last());
        assertEquals(4, jrs.getInt(1));
        jrs.close();


        /*
         * recall execute() after close()
         */
        assertEquals("SELECT * FROM USER_INFO", jrs.getCommand());
        assertEquals(DERBY_URL, jrs.getUrl());
        try {
            jrs.execute();
            fail("should throw SQLException");
        } catch (SQLException e) {
            // expected, No current connection.
        }


        jrs.clearParameters();
        assertEquals("SELECT * FROM USER_INFO", jrs.getCommand());
        assertEquals(DERBY_URL, jrs.getUrl());
        try {
            jrs.execute();
            fail("should throw SQLException");
        } catch (SQLException e) {
            // expected
        }


        jrs = newJdbcRowSet();
        jrs.setUrl(DERBY_URL);
        jrs.setCommand("SELECT * FROM USER_INFO WHERE ID >= ?");
        jrs.setInt(1, 2);
        jrs.execute();
        assertTrue(jrs.first());
        assertEquals(2, jrs.getInt(1));


        // change the query condition
        jrs.setInt(1, 3);
        jrs.execute();
        assertTrue(jrs.first());
        assertEquals(3, jrs.getInt(1));


        // change the command
        jrs.setCommand("SELECT * FROM USER_INFO WHERE NAME = 'hermit'");
        jrs.execute();
        assertTrue(jrs.first());
        assertEquals(1, jrs.getInt(1));
        assertFalse(jrs.next());


        jrs.close();
    }

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            // expected
        }
    }


    public void testAfterClose() throws Exception {
        JdbcRowSet jrs = newJdbcRowSet();
        jrs.setCommand("SELECT * FROM USER_INFO");
        jrs.setUrl(DERBY_URL);
        jrs.execute();
        jrs.close();


        try {
            jrs.absolute(1);
            fail("Should throw NullPointerException");
        } catch (SQLException e) {
            // expected
        }


        try {
            jrs.getString(1);
            fail("Should throw NullPointerException");
        } catch (SQLException e) {
            // expected
        }


        try {
            jrs.updateString(1, "hello");
            fail("Should throw NullPointerException");
        } catch (SQLException e) {
            // expected
        }


        assertEquals("SELECT * FROM USER_INFO", jrs.getCommand());


        try {
            jrs.getConcurrency();
            fail("Should throw SQLException");
        } catch (SQLException e) {
            // expected
        }


        try {
            jrs.getFetchDirection();
            fail("Should throw SQLException");
        } catch (SQLException e) {
            // expected
        }

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    /**
     * @test javax.sql.rowset.JdbcRowTest.commit()
     */
    public void testCommit() throws Exception {
        JdbcRowSet jrs = newJdbcRowSet();
        jrs.setUrl(DERBY_URL);
        jrs.setCommand("SELECT * FROM USER_INFO");


        try {
            jrs.commit();
            fail("Shuld throw NullPointerException since jrs has not been executed.");
        } catch (NullPointerException e) {
            // Expected.
        }


        jrs.execute();
        assertTrue(jrs.absolute(4));
        assertEquals(4, jrs.getInt(1));


        // Inserts a new row.
        jrs.moveToInsertRow();
        jrs.updateInt(1, 5);
        jrs.updateString(2, "test5");
        jrs.insertRow();
        jrs.moveToCurrentRow();


        // Tests if jrs has the same behaviour with connection when commit in
        // auto-commit mode.
        boolean hasCommitException = true;


        try {
            conn.commit();
            hasCommitException = false;
        } catch (SQLException e) {
            // Nothing to do.
        }


        try {
            assertTrue(jrs.getAutoCommit());
            jrs.setAutoCommit(true);
            jrs.commit();
            // The behaviour of jrs should be same with the connection.


            if (hasCommitException) {
                fail("Should throw SQLException");
            }
        } catch (SQLException e) {
            // Expected.
        }


        assertTrue(jrs.absolute(5));
        assertEquals(5, jrs.getInt(1));


        // Set autoCommit to false.
        jrs.setAutoCommit(false);


        // Inserts a row.
        jrs.moveToInsertRow();
        jrs.updateInt(1, 6);
        jrs.updateString(2, "test6");
        jrs.insertRow();
        jrs.moveToCurrentRow();
        assertTrue(jrs.absolute(6));
        assertEquals(6, jrs.getInt(1));


        // Commits
        jrs.commit();
        assertTrue(jrs.absolute(6));
        assertEquals(6, jrs.getInt(1));
        jrs.commit();
        jrs.close();
    }

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    /**
     * @test javax.sql.rowset.JdbcRowTest.rollback()
     */
    public void testRollback() throws Exception {
        JdbcRowSet jrs = newJdbcRowSet();
        jrs.setUrl(DERBY_URL);
        jrs.setCommand("SELECT * FROM USER_INFO");


        try {
            jrs.rollback();
            fail("Shuld throw NullPointerException since jrs has not been executed.");
        } catch (NullPointerException e) {
            // Expected.
        }


        jrs.execute();
        assertTrue(jrs.absolute(4));
        assertEquals(4, jrs.getInt(1));


        // Inserts a new row.
        jrs.moveToInsertRow();
        jrs.updateInt(1, 5);
        jrs.updateString(2, "test5");
        jrs.insertRow();
        jrs.moveToCurrentRow();


        assertTrue(jrs.absolute(5));
        assertEquals(5, jrs.getInt(1));


        // Set autoCommit to false.
        jrs.setAutoCommit(false);


        // Inserts a row.
        jrs.moveToInsertRow();
        jrs.updateInt(1, 6);
        jrs.updateString(2, "test6");
        jrs.insertRow();
        jrs.moveToCurrentRow();
        assertTrue(jrs.absolute(6));
        assertEquals(6, jrs.getInt(1));


        // Rollbacks
        jrs.rollback();
        try {
            jrs.first();
            fail("After rolling back, jrs can't do anything except close.");
        } catch (NullPointerException e) {
            // Expected.
        }


        jrs.close();


        // Reconnect
        jrs = newJdbcRowSet();
        jrs.setUrl(DERBY_URL);
        jrs.setCommand("SELECT * FROM USER_INFO");
        jrs.execute();
        assertTrue(jrs.last());
        assertEquals(
                "Since the insert action was roll back, so the last row is 5, not 6.",
                5, jrs.getInt(1));


        jrs.close();


    }

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    /**
     * @test javax.sql.rowset.JdbcRowTest.rollback() When in auto-commit mode,
     *       the behaviour should be the same with the connection.
     */
    public void testRollbackException() throws Exception {
        JdbcRowSet jrs = newJdbcRowSet();
        jrs.setUrl(DERBY_URL);
        jrs.setCommand("SELECT * FROM USER_INFO");
        jrs.execute();


        // Tests if jrs has the same behaviour with connection when commit in
        // auto-commit mode.
        boolean hasRollbackException = true;


        try {
            conn.rollback();
            hasRollbackException = false;
        } catch (SQLException e) {
            // Nothing to do.
        }


        try {
            assertTrue(jrs.getAutoCommit());
            jrs.setAutoCommit(true);
            jrs.rollback();
            // The behaviour of jrs should be same with the connection.


            if (hasRollbackException) {
                fail("Should throw SQLException");
            }
        } catch (SQLException e) {
            // Expected.
        }


        jrs.close();
    }

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    /**
     * @tests javax.sql.rowset.JdbcRowTest.rollback(SavePoint)
     */
    public void testRollback_LSavePoint_Exception() throws Exception {
        JdbcRowSet jrs = newJdbcRowSet();
        jrs.setUrl(DERBY_URL);
        jrs.setCommand("SELECT * FROM USER_INFO");


        try {
            jrs.rollback(null);
            fail("Shuld throw NullPointerException since jrs has not been executed.");
        } catch (NullPointerException e) {
            // Expected.
        }
        Savepoint savepoint = new MockSavepoint(1, "mock savepoint 1");
        try {
            jrs.rollback(savepoint);
            fail("Shuld throw NullPointerException since jrs has not been executed.");
        } catch (NullPointerException e) {
            // Expected.
        }


        jrs.execute();


        try {
            jrs.rollback(null);
            fail("Should throw SQLException since autoCommit is on");
        } catch (SQLException e) {
            // Expected
        }
        try {
            jrs.rollback(savepoint);
            fail("Should throw SQLException since autoCommit is on");
        } catch (SQLException e) {
            // Expected
        }


        jrs.setAutoCommit(false);
        try {
            jrs.rollback(savepoint);
            fail("Should throw ClassCastException "
                    + "since the savepoint is not the correct type.");
        } catch (ClassCastException e) {
            // Expected.
        }


        jrs.close();
    }

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Examples of javax.sql.rowset.JdbcRowSet

1.0 Overview

2.0 Creating a JdbcRowSet Object

Related Classes of javax.sql.rowset.JdbcRowSet

2.0 Creating a `JdbcRowSet` Object