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


    public void testAddJoinableRowSet_JdbcRowSet_Exception() throws Exception {
        /*
         * Test empty JdbcRowSet
         */
        JdbcRowSet jdbcRs = newJdbcRowSet();
        try {
            jrs.addRowSet(jdbcRs);
            fail("should throw SQLException");
        } catch (SQLException e) {
            // expected
        }
        jdbcRs.setMatchColumn(1);
        try {
            jrs.addRowSet(jdbcRs);
            fail("should throw SQLException");
        } catch (SQLException e) {
            // expected
        }
        jrs.close();


        /*
         * Test JdbcRowSet filled with data
         */
        jrs = newJoinRowSet();
        jdbcRs = newJdbcRowSet();
        jdbcRs.setUrl(DERBY_URL);
        jdbcRs.setCommand("SELECT * FROM USER_INFO");
        jdbcRs.execute();
        try {
            jrs.addRowSet(jdbcRs);
            fail("should throw SQLException");
        } catch (SQLException e) {
            // expected
        }
        jdbcRs.setMatchColumn(2);
        jrs.addRowSet(jdbcRs);
        jrs.close();
    }

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    public void testAddJoinableRowSet_JdbcRowSet_Int_Exception()
            throws Exception {
        /*
         * Test empty JdbcRowSet
         */
        JdbcRowSet jdbcRs = newJdbcRowSet();
        if ("true".equals(System.getProperty("Testing Harmony"))) {
            try {
                jrs.addRowSet(jdbcRs, 1);
                fail("should throw SQLException");
            } catch (SQLException e) {
                // expected
            }
        } else {
            try {
                jrs.addRowSet(jdbcRs, 1);
                fail("should throw ClassCastException");
            } catch (ClassCastException e) {
                // expected
            }
        }
        jrs.close();


        /*
         * Test JdbcRowSet filled with data
         */
        jrs = newJoinRowSet();
        jdbcRs = newJdbcRowSet();
        jdbcRs.setUrl(DERBY_URL);
        jdbcRs.setCommand("SELECT * FROM USER_INFO");
        jdbcRs.execute();
        if ("true".equals(System.getProperty("Testing Harmony"))) {
            jrs.addRowSet(jdbcRs, 1);
        } else {
            try {
                jrs.addRowSet(jdbcRs, 1);

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        /*
         * Add a JdbcRowSet which can't set Table Name
         */
        jrs = newJoinRowSet();
        JdbcRowSet jdbcRs = newJdbcRowSet();
        jdbcRs.setCommand("SELECT * FROM USER_INFO");
        jdbcRs.setUrl(DERBY_URL);
        jdbcRs.execute();
        jdbcRs.setMatchColumn(1);
        jrs.addRowSet(jdbcRs);
        // add a CachedRowSet with table name
        crset = newNoInitialInstance();
        crset.populate(st.executeQuery("SELECT * FROM BOOKS"));
        crset.setMatchColumn(1);

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public class JdbcRowSetJoinTest extends CachedRowSetTestCase {


    public void testSetMatchColumn_Name() throws Exception {
        String name = null;
        JdbcRowSet noInitalJrs = noInitalJdbcRowSet();
        JdbcRowSet jrs = newJdbcRowSet();
        /*
         * TODO spec: throw SQLException, RI throw NullPointerException, Harmony
         * follow spec
         */
        if (!"true".equals(System.getProperty("Testing Harmony"))) {
            try {
                noInitalJrs.setMatchColumn(name);
                fail("Should throw NullPointerException");
            } catch (NullPointerException e) {
                // expected
            }
        } else {


            try {
                noInitalJrs.setMatchColumn(name);
                fail("Should throw SQLException");
            } catch (SQLException e) {
                // expected, Match columns should not be empty or null string
            }
        }


        try {
            noInitalJrs.setMatchColumn("");
            fail("Should throw SQLException");
        } catch (SQLException e) {
            // expected, Match columns should not be empty or null string
        }


        noInitalJrs.setMatchColumn("not exist");
        String[] names = noInitalJrs.getMatchColumnNames();
        assertNotNull(names);
        assertEquals(10, names.length);
        assertEquals("not exist", names[0]);
        for (int i = 1; i < names.length; i++) {
            assertNull(names[i]);
        }


        noInitalJrs.setMatchColumn("id");
        names = noInitalJrs.getMatchColumnNames();
        assertNotNull(names);
        assertEquals(10, names.length);
        assertEquals("id", names[0]);
        for (int i = 1; i < names.length; i++) {
            assertNull(names[i]);
        }


        noInitalJrs.setMatchColumn(new String[] { "ID", "NAME" });


        names = null;


        try {
            noInitalJrs.setMatchColumn(names);
            fail("Should throw NullPointerException");
        } catch (NullPointerException e) {
            // expected
        }


        names = noInitalJrs.getMatchColumnNames();
        assertNotNull(names);
        assertEquals(12, names.length);
        assertEquals("ID", names[0]);
        assertEquals("NAME", names[1]);
        assertEquals("id", names[2]);


        for (int i = 3; i < names.length; i++) {
            assertNull(names[i]);
        }


        try {
            noInitalJrs.setMatchColumn(new String[] { "ID", "" });
            fail("Should throw SQLException");
        } catch (SQLException e) {
            // expected, Match columns should not be empty or null string
        }


        try {
            noInitalJrs.setMatchColumn(new String[] { "ID", null });
            fail("Should throw SQLException");
        } catch (SQLException e) {
            // expected, Match columns should not be empty or null string
        }


        noInitalJrs.setMatchColumn("NAME");
        names = noInitalJrs.getMatchColumnNames();
        assertNotNull(names);
        assertEquals(12, names.length);
        assertEquals("NAME", names[0]);
        assertEquals("NAME", names[1]);
        assertEquals("id", names[2]);


        for (int i = 3; i < names.length; i++) {
            assertNull(names[i]);
        }


        if (!"true".equals(System.getProperty("Testing Harmony"))) {
            try {
                jrs.setMatchColumn(name);
                fail("Should throw NullPointerException");
            } catch (NullPointerException e) {
                // expected
            }
        } else {


            try {
                jrs.setMatchColumn(name);
                fail("Should throw SQLException");
            } catch (SQLException e) {
                // expected, Match columns should not be empty or null string
            }
        }


        try {
            jrs.setMatchColumn("");
            fail("Should throw SQLException");
        } catch (SQLException e) {
            // expected, Match columns should not be empty or null string
        }


        jrs.setMatchColumn("not exist");
        names = jrs.getMatchColumnNames();
        assertNotNull(names);
        assertEquals(10, names.length);
        assertEquals("not exist", names[0]);
        for (int i = 1; i < names.length; i++) {
            assertNull(names[i]);
        }


        jrs.setMatchColumn("id");
        names = jrs.getMatchColumnNames();
        assertNotNull(names);
        assertEquals(10, names.length);
        assertEquals("id", names[0]);
        for (int i = 1; i < names.length; i++) {
            assertNull(names[i]);
        }


        jrs.setMatchColumn(new String[] { "ID", "NAME" });
        names = jrs.getMatchColumnNames();
        assertNotNull(names);
        assertEquals(12, names.length);
        assertEquals("ID", names[0]);
        assertEquals("NAME", names[1]);
        assertEquals("id", names[2]);


        for (int i = 3; i < names.length; i++) {
            assertNull(names[i]);
        }


        try {
            jrs.setMatchColumn(new String[] { "ID", "" });
            fail("Should throw SQLException");
        } catch (SQLException e) {
            // expected, Match columns should not be empty or null string
        }


        try {
            jrs.setMatchColumn(new String[] { "ID", null });
            fail("Should throw SQLException");
        } catch (SQLException e) {
            // expected, Match columns should not be empty or null string
        }


        jrs.setMatchColumn("NAME");
        names = jrs.getMatchColumnNames();
        assertNotNull(names);
        assertEquals(12, names.length);
        assertEquals("NAME", names[0]);
        assertEquals("NAME", names[1]);
        assertEquals("id", names[2]);

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        assertTrue(rs.next());
        assertEquals(2, rs.getInt(1));
    }


    public void testInsertRow_Multi() throws Exception {
        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.updateInt(1, 6);
        jrs.updateString(2, "insert6");
        jrs.insertRow();
        jrs.updateInt(1, 7);
        jrs.updateString(2, "insert7");
        jrs.insertRow();
        jrs.moveToCurrentRow();


        int index = 0;
        jrs.beforeFirst();
        while (jrs.next()) {
            index++;
            assertEquals(index, jrs.getInt(1));
        }
        assertEquals(7, index);


        jrs.close();


        /*
         * Check database
         */
        rs = st
                .executeQuery("SELECT COUNT(*) FROM USER_INFO WHERE NAME LIKE 'insert%'");
        assertTrue(rs.next());
        assertEquals(3, rs.getInt(1));


        /*
         * Change another way to insert multiple rows
         */
        jrs = newJdbcRowSet();
        jrs.setCommand("SELECT * FROM USER_INFO");
        jrs.setUrl(DERBY_URL);
        jrs.execute();


        assertTrue(jrs.absolute(7));
        jrs.moveToInsertRow();
        jrs.updateInt(1, 8);
        jrs.updateString(2, "insert8");
        jrs.insertRow();
        jrs.moveToInsertRow();
        jrs.updateInt(1, 9);
        jrs.updateString(2, "insert9");
        jrs.insertRow();
        jrs.moveToInsertRow();
        jrs.updateInt(1, 10);
        jrs.updateString(2, "insert10");
        jrs.insertRow();
        jrs.moveToCurrentRow();


        /*
         * Check JdbcRowSet
         */
        assertEquals(7, jrs.getInt(1));
        index = 7;
        while (jrs.next()) {
            index++;
            assertEquals(index, jrs.getInt(1));
        }
        assertEquals(10, index);


        jrs.close();


        /*
         * Check database
         */
        rs = st.executeQuery("SELECT COUNT(*) FROM USER_INFO WHERE ID > 7");

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        assertTrue(rs.next());
        assertEquals(3, rs.getInt(1));
    }


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


        jrs.moveToInsertRow();
        try {
            jrs.cancelRowUpdates();
            fail("should throw SQLException");
        } catch (SQLException e) {
            // expected
        }
        jrs.moveToCurrentRow();


        assertTrue(jrs.absolute(3));
        jrs.updateString(2, "update3");
        jrs.updateRow();
        assertTrue(jrs.rowUpdated());
        assertEquals("update3", jrs.getString(2));
        jrs.cancelRowUpdates();
        assertEquals("update3", jrs.getString(2));


        assertTrue(jrs.next());
        assertEquals(4, jrs.getInt(1));
        jrs.updateString(2, "update4");
        assertFalse(jrs.rowUpdated());
        assertEquals("update4", jrs.getString(2));
        jrs.cancelRowUpdates();
        assertEquals("test4", jrs.getString(2));


        jrs.close();


        /*
         * Check database
         */
        rs = st.executeQuery("SELECT * FROM USER_INFO WHERE ID = 3");

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        assertTrue(rs.next());
        assertEquals("update3", rs.getString(2));
    }


    public void testFindColumn() throws Exception {
        JdbcRowSet jrs = newJdbcRowSet();
        try {
            jrs.findColumn("abc");
            fail("should throw SQLException");
        } catch (SQLException e) {
            // expected
        }
        jrs.setCommand("SELECT * FROM USER_INFO");
        jrs.setUrl(DERBY_URL);
        jrs.execute();


        assertEquals(1, jrs.findColumn("ID"));
        try {
            jrs.findColumn("abc");
            fail("should throw SQLException");
        } catch (SQLException e) {
            // expected
        }


        jrs.close();
    }

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        jrs.close();
    }


    public void testGetStatement() throws Exception {
        JdbcRowSet jrs = newJdbcRowSet();
        assertNull(jrs.getStatement());
        jrs.setCommand("SELECT * FROM USER_INFO");
        jrs.setUrl(DERBY_URL);
        jrs.execute();
        assertTrue(jrs.getStatement() instanceof PreparedStatement);


        jrs.close();


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

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            // expected
        }
    }


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


        assertTrue(jrs.getAutoCommit());
        assertTrue(jrs.absolute(3));
        jrs.updateString(2, "update3");
        jrs.updateRow();
        jrs.rollback();


        // after rollback, resultset is closed
        assertNull(jrs.getStatement());
        try {
            jrs.getString(2);
            fail("should throw exception");
        } catch (NullPointerException e) {
            // expected
        }


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


        jrs.close();


        /*
         * TODO Check database. The database is supposed to has been updated.
         * However, it's not.
         */

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        assertTrue(rs.next());
        assertEquals(0, rs.getInt(1));
    }


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


        jrs.setAutoCommit(false);
        assertFalse(jrs.getAutoCommit());
        assertTrue(jrs.absolute(3));
        jrs.updateString(2, "update3");
        jrs.updateRow();
        jrs.commit();
        jrs.rollback();


        /*
         * TODO why throw NullPointerException after call rollback()?
         */
        try {
            jrs.absolute(1);
            fail("should throw exception");
        } catch (NullPointerException e) {
            // expected
        }


        jrs.close();


        /*
         * Check database
         */
        rs = st

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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