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

    /**
     * @tests javax.sql.rowset.JdbcRowTest.setShowDeleted() and
     *        javax.sql.rowset.JdbcRowTest.getShowDeleted().
     */
    public void testShowDeleted() throws Exception {
        JdbcRowSet jrs = newJdbcRowSet();


        boolean showDeleted = jrs.getShowDeleted();
        assertFalse("The default value is false.", showDeleted);


        jrs.setUrl(DERBY_URL);
        jrs.setCommand("SELECT * FROM USER_INFO");
        jrs.execute();


        // Deletes the 4th row.
        jrs.absolute(4);
        jrs.deleteRow();
        try {
            jrs.getInt(1);
            fail("Should throw SQLException " + "since no current row.");
        } catch (SQLException e) {
            // Expected.
        }


        jrs.first();
        int index = 0;
        while (jrs.next()) {
            index++;
        }


        assertEquals(3, index);


        jrs.setShowDeleted(true);
        assertTrue(jrs.getShowDeleted());


        jrs.absolute(3);
        jrs.deleteRow();
        jrs.first();
        index = 0;
        while (jrs.next()) {
            index++;
        }


        assertEquals("The deleted row should still be showed", 3, index);


        jrs.close();
    }

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        jrs.close();
    }


    public void testExecute_SelectCmd() throws Exception {
        JdbcRowSet jrs = newJdbcRowSet();
        jrs.setCommand("SELECT * FROM USER_INFO WHERE ID > ?");
        jrs.setUrl(DERBY_URL);
        jrs.setInt(1, 1);
        jrs.execute();


        assertEquals(ResultSet.TYPE_SCROLL_INSENSITIVE, jrs.getType());
        assertEquals(ResultSet.CONCUR_UPDATABLE, jrs.getConcurrency());
        assertTrue(jrs.getAutoCommit());
        assertTrue(jrs.first());
        assertEquals(2, jrs.getInt(1));
        assertTrue(jrs.absolute(2));
        assertEquals(3, jrs.getInt(1));
        assertTrue(jrs.last());
        assertEquals(4, jrs.getInt(1));
        assertTrue(jrs.previous());
        assertEquals(3, jrs.getInt(1));
        assertTrue(jrs.relative(-1));
        assertEquals(2, jrs.getInt(1));
        jrs.close();
    }

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        assertEquals(2, jrs.getInt(1));
        jrs.close();
    }


    public void testExecute_UpdateCmd() throws Exception {
        JdbcRowSet jrs = newJdbcRowSet();
        jrs.setCommand("Update User_INFO set Name= ? Where ID= ? ");
        jrs.setUrl(DERBY_URL);
        jrs.setString(1, "update");
        jrs.setInt(2, 3);
        try {
            jrs.execute();
            fail("should throw SQLException");
        } catch (SQLException e) {
            // expected
        }
        jrs.close();
    }

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        }
        jrs.close();
    }


    public void testExecute_DeleteCmd() throws Exception {
        JdbcRowSet jrs = newJdbcRowSet();
        jrs.setCommand("DELETE FROM USER_INFO");
        jrs.setUrl(DERBY_URL);
        try {
            jrs.execute();
            fail("should throw SQLException");
        } catch (SQLException e) {
            // expected
        }
        jrs.close();
    }

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        }
        jrs.close();
    }


    public void testExecute_InsertCmd() throws Exception {
        JdbcRowSet jrs = newJdbcRowSet();
        jrs.setCommand("insert into USER_INFO(ID,NAME) values (6,'insert6')");
        jrs.setUrl(DERBY_URL);
        try {
            jrs.execute();
            fail("should throw SQLException");
        } catch (SQLException e) {
            // expected
        }
        jrs.close();
    }

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        }
        jrs.close();
    }


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


        assertTrue(jrs.absolute(3));
        assertEquals(3, jrs.getInt(1));
        assertEquals("test3", jrs.getString(2));
        jrs.updateString(2, "update3");
        assertFalse(jrs.rowUpdated());
        jrs.updateRow();
        assertTrue(jrs.rowUpdated());
        assertEquals("update3", jrs.getString(2));


        jrs.close();


        // check db
        rs = st
                .executeQuery("SELECT COUNT(*) FROM USER_INFO WHERE NAME = 'update3'");
        assertTrue(rs.next());

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


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


        assertTrue(jrs.absolute(-2));
        assertEquals("test3", jrs.getString(2));
        jrs.updateRow();
        assertFalse(jrs.rowUpdated());


        jrs.updateString(2, "too looooooooooooooooooooong");
        try {
            jrs.updateRow();
            fail("should throw SQLException");
        } catch (SQLException e) {
            // expected
        }
        try {
            assertFalse(jrs.rowUpdated());
            fail("should throw SQLException");
        } catch (SQLException e) {
            // expected
        }


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


        jrs.close();
    }

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        jrs.close();
    }


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


        assertTrue(jrs.first());
        jrs.deleteRow();


        try {
            jrs.getInt(1);
            fail("should throw SQLException");
        } catch (SQLException e) {
            // expected
        }


        jrs.close();


        /*
         * Check database
         */
        rs = st.executeQuery("SELECT COUNT(*) FROM USER_INFO WHERE ID = 1");

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    public void testInsertRow_Single() throws Exception {
        /*
         * In JdbcRowSet, the inserted row is the last row. The behavior is the
         * same as ResultSet.
         */
        JdbcRowSet jrs = newJdbcRowSet();
        jrs.setCommand("SELECT * FROM USER_INFO");
        jrs.setUrl(DERBY_URL);
        jrs.execute();


        jrs.moveToInsertRow();
        jrs.updateInt(1, 5);
        jrs.updateString(2, "insert5");
        jrs.insertRow();
        jrs.moveToCurrentRow();


        // check the inserted row
        assertTrue(jrs.absolute(5));
        /*
         * If uncommenting the following line, then the inserted row which ID is
         * 6 would be invisible to JdbcRowSet.
         */
        // assertTrue(jrs.isLast());
        assertEquals(5, jrs.getInt(1));


        jrs.moveToInsertRow();
        jrs.updateInt(1, 6);
        jrs.updateString(2, "insert6");
        jrs.insertRow();
        jrs.moveToCurrentRow();


        assertTrue(jrs.last());
        assertEquals(6, jrs.getInt(1));
        assertTrue(jrs.previous());
        assertEquals(5, jrs.getInt(1));


        jrs.close();


        // check db
        rs = st
                .executeQuery("SELECT COUNT(*) FROM USER_INFO WHERE NAME = 'insert5' OR NAME = 'insert6'");
        assertTrue(rs.next());

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        return (JdbcRowSet) Class.forName("com.sun.rowset.JdbcRowSetImpl")
                .newInstance();
    }


    public void testBeforeInitial() throws Exception {
        JdbcRowSet jrs = newJdbcRowSet();


        // move cursor
        try {
            jrs.absolute(1);
            fail("Should throw SQLException");
        } catch (SQLException e) {
            // expected, Invalid state
        }


        try {
            jrs.beforeFirst();
            fail("Should throw SQLException");
        } catch (SQLException e) {
            // expected, Invalid state
        }


        try {
            jrs.afterLast();
            fail("Should throw SQLException");
        } catch (SQLException e) {
            // expected, Invalid state
        }
        try {
            jrs.last();
            fail("Should throw SQLException");
        } catch (SQLException e) {
            // expected, Invalid state
        }
        try {
            jrs.first();
            fail("Should throw SQLException");
        } catch (SQLException e) {
            // expected, Invalid state
        }
        try {
            jrs.isAfterLast();
            fail("Should throw SQLException");
        } catch (SQLException e) {
            // expected, Invalid state
        }
        try {
            jrs.isBeforeFirst();
            fail("Should throw SQLException");
        } catch (SQLException e) {
            // expected, Invalid state
        }
        try {
            jrs.isFirst();
            fail("Should throw SQLException");
        } catch (SQLException e) {
            // expected, Invalid state
        }
        try {
            jrs.isLast();
            fail("Should throw SQLException");
        } catch (SQLException e) {
            // expected, Invalid state
        }


        try {
            jrs.getRow();
            fail("Should throw SQLException");
        } catch (SQLException e) {
            // expected, Invalid state
        }


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


        // get properties


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


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


        assertEquals(0, jrs.getFetchSize());
        assertEquals(ResultSet.TYPE_SCROLL_INSENSITIVE, jrs.getType());
        assertNull(jrs.getTypeMap());
        assertTrue(jrs.getEscapeProcessing());


        // set properties
        jrs.setConcurrency(RowSet.CONCUR_UPDATABLE);
        jrs.setType(ResultSet.TYPE_FORWARD_ONLY);
        jrs.setEscapeProcessing(false);
        assertFalse(jrs.getEscapeProcessing());


        // JdbcRowSet methods
        try {
            jrs.getAutoCommit();
            fail("Should throw NullPointerException");
        } catch (NullPointerException e) {
            // expected
        }


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


        try {
            jrs.setAutoCommit(false);
            fail("Should throw NullPointerException");
        } catch (NullPointerException e) {
            // expected
        }


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


        assertNull(jrs.getRowSetWarnings());


        // update methods
        try {
            jrs.updateString(1, "test");
            fail("Should throw SQLException");
        } catch (SQLException e) {
            // expected, Invalid state
        }


        try {
            jrs.insertRow();
            fail("Should throw SQLException");
        } catch (SQLException e) {
            // expected, Invalid state
        }


        jrs.close();


        try {
            jrs.clearWarnings();
            fail("Should throw SQLException");
        } catch (SQLException e) {
            // expected, Invalid state
        }


        try {
            jrs.findColumn("ID");
            fail("Should throw SQLException");
        } catch (SQLException e) {
            // expected, Invalid state
        }


        try {
            jrs.wasNull();
            fail("Should throw SQLException");
        } catch (SQLException e) {
            // expected, Invalid state
        }


        try {
            jrs.getMetaData();
            fail("Should throw SQLException");
        } catch (SQLException e) {
            // expected, Invalid state
        }


        try {
            jrs.getWarnings();
            fail("Should throw SQLException");
        } catch (SQLException e) {
            // expected, Invalid state
        }
    }

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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