Source Code Cross Referenced for CachedRowSetXReader.java in  » IDE-Netbeans » visualweb.api.designer » com » sun » sql » rowset » internal » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » IDE Netbeans » visualweb.api.designer » com.sun.sql.rowset.internal 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
003:         *
004:         * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
005:         *
006:         * The contents of this file are subject to the terms of either the GNU
007:         * General Public License Version 2 only ("GPL") or the Common
008:         * Development and Distribution License("CDDL") (collectively, the
009:         * "License"). You may not use this file except in compliance with the
010:         * License. You can obtain a copy of the License at
011:         * http://www.netbeans.org/cddl-gplv2.html
012:         * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the
013:         * specific language governing permissions and limitations under the
014:         * License.  When distributing the software, include this License Header
015:         * Notice in each file and include the License file at
016:         * nbbuild/licenses/CDDL-GPL-2-CP.  Sun designates this
017:         * particular file as subject to the "Classpath" exception as provided
018:         * by Sun in the GPL Version 2 section of the License file that
019:         * accompanied this code. If applicable, add the following below the
020:         * License Header, with the fields enclosed by brackets [] replaced by
021:         * your own identifying information:
022:         * "Portions Copyrighted [year] [name of copyright owner]"
023:         *
024:         * Contributor(s):
025:         *
026:         * The Original Software is NetBeans. The Initial Developer of the Original
027:         * Software is Sun Microsystems, Inc. Portions Copyright 1997-2007 Sun
028:         * Microsystems, Inc. All Rights Reserved.
029:         *
030:         * If you wish your version of this file to be governed by only the CDDL
031:         * or only the GPL Version 2, indicate your decision by adding
032:         * "[Contributor] elects to include this software in this distribution
033:         * under the [CDDL or GPL Version 2] license." If you do not indicate a
034:         * single choice of license, a recipient has the option to distribute
035:         * your version of this file under either the CDDL, the GPL Version 2 or
036:         * to extend the choice of license to its licensees as provided above.
037:         * However, if you add GPL Version 2 code and therefore, elected the GPL
038:         * Version 2 license, then the option applies only if the new code is
039:         * made subject to such option by the copyright holder.
040:         */
041:
042:        package com.sun.sql.rowset.internal;
043:
044:        import java.sql.*;
045:        import javax.sql.*;
046:        import javax.naming.*;
047:        import java.io.*;
048:        import java.lang.reflect.*;
049:
050:        //import com.sun.rowset.*;
051:        import javax.sql.rowset.*;
052:        import javax.sql.rowset.spi.*;
053:
054:        import com.sun.sql.rowset.CachedRowSetX;
055:        import com.sun.sql.rowset.CachedRowSetXImpl;
056:
057:        import java.text.MessageFormat;
058:        import java.util.Locale;
059:        import java.util.ResourceBundle;
060:
061:        /**
062:         * An implementation of RowSetReader to work with CachedRowSetX rowsets.
063:         *
064:         * Based on the Sun reference implementation of CachedRowSetReader.
065:         *
066:         * @see javax.sql.rowset.spi.SyncProvider
067:         * @see javax.sql.rowset.spi.SyncFactory
068:         * @see javax.sql.rowset.spi.SyncFactoryException
069:         */
070:        public class CachedRowSetXReader implements  RowSetReader, Serializable {
071:
072:            private static ResourceBundle rb = ResourceBundle.getBundle(
073:                    "com.sun.sql.rowset.internal.Bundle", Locale.getDefault()); // NOI18N
074:
075:            /**
076:             * The field that keeps track of whether the writer associated with
077:             * this <code>CachedRowSetXReader</code> object's rowset has been called since
078:             * the rowset was populated.
079:             * <P>
080:             * When this <code>CachedRowSetXReader</code> object reads data into
081:             * its rowset, it sets the field <code>writerCalls</code> to 0.
082:             * When the writer associated with the rowset is called to write
083:             * data back to the underlying data source, its <code>writeData</code>
084:             * method calls the method <code>CachedRowSetXReader.reset</code>,
085:             * which increments <code>writerCalls</code> and returns <code>true</code>
086:             * if <code>writerCalls</code> is 1. Thus, <code>writerCalls</code> equals
087:             * 1 after the first call to <code>writeData</code> that occurs
088:             * after the rowset has had data read into it.
089:             *
090:             * @serial
091:             */
092:            private int writerCalls = 0;
093:
094:            private boolean userCon = false;
095:
096:            private int startPosition;
097:
098:            /**
099:             * Reads data from a data source and populates the given
100:             * <code>RowSet</code> object with that data.
101:             * This method is called by the rowset internally when
102:             * the application invokes the method <code>execute</code>
103:             * to read a new set of rows.
104:             * <P>
105:             * After clearing the rowset of its contents, if any, and setting
106:             * the number of writer calls to <code>0</code>, this reader calls
107:             * its <code>connect</code> method to make
108:             * a connection to the rowset's data source. Depending on which
109:             * of the rowset's properties have been set, the <code>connect</code>
110:             * method will use a <code>DataSource</code> object or the
111:             * <code>DriverManager</code> facility to make a connection to the
112:             * data source.
113:             * <P>
114:             * Once the connection to the data source is made, this reader
115:             * executes the query in the calling <code>CachedRowSet</code> object's
116:             * <code>command</code> property. Then it calls the rowset's
117:             * <code>populate</code> method, which reads data from the
118:             * <code>ResultSet</code> object produced by executing the rowset's
119:             * command. The rowset is then populated with this data.
120:             * <P>
121:             * This method's final act is to close the connection it made, thus
122:             * leaving the rowset disconnected from its data source.
123:             *
124:             * @param caller a <code>RowSet</code> object that has implemented
125:             *               the <code>RowSetInternal</code> interface and had
126:             *               this <code>CachedRowSetXReader</code> object set as
127:             *               its reader
128:             * @throws SQLException if there is a database access error, there is a
129:             *         problem making the connection, or the command property has not
130:             *         been set
131:             */
132:            public void readData(RowSetInternal caller) throws SQLException {
133:                Connection con = null;
134:                boolean printStatements = (caller instanceof  CachedRowSetX) ? ((CachedRowSetX) caller)
135:                        .getPrintStatements()
136:                        : false;
137:                try {
138:                    CachedRowSet crs = (CachedRowSet) caller;
139:
140:                    // Get rid of the current contents of the rowset.
141:
142:                    /**
143:                     * Checking added to verify whether page size has been set or not.
144:                     * If set then do not close the object as certain parameters need
145:                     * to be maintained.
146:                     */
147:
148:                    if (crs.getPageSize() == 0 && crs.size() > 0) {
149:                        // When page size is not set,
150:                        // crs.size() will show the total no of rows.
151:                        crs.close();
152:                    }
153:
154:                    writerCalls = 0;
155:
156:                    // Get a connection.  This reader assumes that the necessary
157:                    // properties have been set on the caller to let it supply a
158:                    // connection.
159:                    userCon = false;
160:
161:                    con = this .connect(caller);
162:
163:                    // Check our assumptions.
164:                    if (con == null || crs.getCommand() == null)
165:                        throw new SQLException(
166:                                "Internal Error in RowSetReader: no connection or command.");
167:
168:                    try {
169:                        con.setTransactionIsolation(crs
170:                                .getTransactionIsolation());
171:                    } catch (Exception ex) {
172:                        if (printStatements) {
173:                            System.out
174:                                    .println("setTransactionIsolation() failed "
175:                                            + crs.getTransactionIsolation());
176:                        }
177:                    }
178:                    // Use JDBC to read the data.
179:                    PreparedStatement pstmt = con.prepareStatement(crs
180:                            .getCommand());
181:                    // Pass any input parameters to JDBC.
182:
183:                    decodeParams(caller.getParams(), pstmt);
184:
185:                    StringBuffer msg = null;
186:                    if (printStatements) {
187:                        msg = new StringBuffer(200);
188:                        msg.append(crs.getCommand());
189:                        msg.append("\n");
190:                        Object[] params = caller.getParams();
191:                        if (params.length > 0) {
192:                            for (int i = 0; i < params.length; i++) {
193:                                msg.append("  Param[" + (i + 1) + "]=(");
194:                                if (params[i] != null) {
195:                                    msg.append(params[i].getClass().getName()
196:                                            + "," + params[i].toString() + ")");
197:                                } else {
198:                                    msg.append("null)");
199:                                }
200:                            }
201:                        } else {
202:                            msg.append(" No Params");
203:                        }
204:                    }
205:                    // drivers may not support the following, so ignore exceptions.
206:                    try {
207:                        pstmt.setMaxRows(crs.getMaxRows());
208:                    } catch (Exception ex) {
209:                        ;
210:                    }
211:                    try {
212:                        pstmt.setMaxFieldSize(crs.getMaxFieldSize());
213:                    } catch (Exception ex) {
214:                        ;
215:                    }
216:                    try {
217:                        pstmt.setEscapeProcessing(crs.getEscapeProcessing());
218:                    } catch (Exception ex) {
219:                        ;
220:                    }
221:                    try {
222:                        pstmt.setQueryTimeout(crs.getQueryTimeout());
223:                    } catch (Exception ex) {
224:                        ;
225:                    }
226:
227:                    if (crs.getCommand().toLowerCase().indexOf("select") != -1) { //NOI18N
228:                        // can be (crs.getCommand()).indexOf("select")) == 0 //NOI18N
229:                        // because we will be getting resultset when
230:                        // it may be the case that some false select query with
231:                        // select coming in between instead of first.
232:
233:                        // if ((crs.getCommand()).indexOf("?")) does not return -1 //NOI18N
234:                        // implies a Prepared Statement like query exists.
235:
236:                        ResultSet rs;
237:                        if (crs.getPageSize() == 0) {
238:                            if (printStatements) {
239:                                System.out
240:                                        .println("Reader executing query ps=0 "
241:                                                + msg);
242:                            }
243:                            rs = pstmt.executeQuery();
244:                            crs.populate(rs);
245:                            if (printStatements) {
246:                                System.out.println("Reader executing finished");
247:                            }
248:                        } else {
249:                            /**
250:                             * If page size has been set then create a ResultSet object that is scrollable using a
251:                             * PreparedStatement handle.Also call the populate(ResultSet,int) function to populate
252:                             * a page of data as specified by the page size.
253:                             */
254:                            pstmt = con.prepareStatement(crs.getCommand(),
255:                                    ResultSet.TYPE_SCROLL_INSENSITIVE,
256:                                    ResultSet.CONCUR_UPDATABLE);
257:                            decodeParams(caller.getParams(), pstmt);
258:
259:                            // drivers may not support the following, so ignore exceptions.
260:                            try {
261:                                pstmt.setMaxRows(crs.getMaxRows());
262:                            } catch (Exception ex) {
263:                                ;
264:                            }
265:                            try {
266:                                pstmt.setMaxFieldSize(crs.getMaxFieldSize());
267:                            } catch (Exception ex) {
268:                                ;
269:                            }
270:                            try {
271:                                pstmt.setEscapeProcessing(crs
272:                                        .getEscapeProcessing());
273:                            } catch (Exception ex) {
274:                                ;
275:                            }
276:                            try {
277:                                pstmt.setQueryTimeout(crs.getQueryTimeout());
278:                            } catch (Exception ex) {
279:                                ;
280:                            }
281:
282:                            if (printStatements) {
283:                                System.out.println("Reader executing query ps="
284:                                        + crs.getPageSize() + " " + msg);
285:                            }
286:                            rs = pstmt.executeQuery();
287:                            crs.populate(rs, startPosition);
288:                            if (printStatements) {
289:                                System.out.println("Reader executing finished");
290:                            }
291:                        }
292:                        rs.close();
293:                    } else {
294:                        if (printStatements) {
295:                            System.out.println("Reader executing non-select "
296:                                    + msg);
297:                        }
298:                        pstmt.executeUpdate();
299:                        if (printStatements) {
300:                            System.out.println("Reader executing finished");
301:                        }
302:                    }
303:
304:                    // Get the data.
305:                    pstmt.close();
306:                    try {
307:                        con.commit();
308:                    } catch (SQLException ex) {
309:                        if (printStatements) {
310:                            ex.printStackTrace();
311:                        }
312:                    }
313:                } catch (SQLException ex) {
314:                    // Throw an exception if reading fails for any reason.
315:                    if (printStatements) {
316:                        ex.printStackTrace();
317:                    }
318:                    throw ex;
319:                } finally {
320:                    try {
321:                        // only close connections we created...
322:                        if (con != null && getCloseConnection() == true) {
323:                            try {
324:                                if (!con.getAutoCommit()) {
325:                                    con.rollback();
326:                                }
327:                            } catch (Exception dummy) {
328:                                /*
329:                                 * not an error condition, we're closing anyway, but
330:                                 * we'd like to clean up any locks if we can since
331:                                 * it is not clear the connection pool will clean
332:                                 * these connections in a timely manner
333:                                 */
334:                            }
335:                            con.close();
336:                            con = null;
337:                        }
338:                    } catch (SQLException e) {
339:                        // will get exception if something already went wrong, but don't
340:                        // override that exception with this one
341:                    }
342:                }
343:            }
344:
345:            /**
346:             * Checks to see if the writer associated with this reader needs
347:             * to reset its state.  The writer will need to initialize its state
348:             * if new contents have been read since the writer was last called.
349:             * This method is called by the writer that was registered with
350:             * this reader when components were being wired together.
351:             *
352:             * @return <code>true</code> if writer associated with this reader needs
353:             *         to reset the values of its fields; <code>false</code> otherwise
354:             * @throws SQLException if an access error occurs
355:             */
356:            public boolean reset() throws SQLException {
357:                writerCalls++;
358:                return writerCalls == 1;
359:            }
360:
361:            /**
362:             * Establishes a connection with the data source for the given
363:             * <code>RowSet</code> object.  If the rowset's <code>dataSourceName</code>
364:             * property has been set, this method uses the JNDI API to retrieve the
365:             * <code>DataSource</code> object that it can use to make the connection.
366:             * If the url, username, and password properties have been set, this
367:             * method uses the <code>DriverManager.getConnection</code> method to
368:             * make the connection.
369:             * <P>
370:             * This method is used internally by the reader and writer associated with
371:             * the calling <code>RowSet</code> object; an application never calls it
372:             * directly.
373:             *
374:             * @param caller a <code>RowSet</code> object that has implemented
375:             *               the <code>RowSetInternal</code> interface and had
376:             *               this <code>CachedRowSetXReader</code> object set as
377:             *               its reader
378:             * @return a <code>Connection</code> object that represents a connection
379:             *         to the caller's data source
380:             * @throws SQLException if an access error occurs
381:             */
382:            public Connection connect(RowSetInternal caller)
383:                    throws SQLException {
384:
385:                // Get a JDBC connection.
386:                if (caller.getConnection() != null) {
387:                    // A connection was passed to execute(), so use it.
388:                    // As we are using a connection the user gave us we
389:                    // won't close it.
390:                    userCon = true;
391:                    return caller.getConnection();
392:                } else if (((RowSet) caller).getDataSourceName() != null) {
393:                    // Connect using JNDI.
394:                    try {
395:                        Context ctx = new InitialContext();
396:                        DataSource ds = (DataSource) ctx
397:                                .lookup(((RowSet) caller).getDataSourceName());
398:
399:                        // Check for username, password,
400:                        // if it exists try getting a Connection handle through them
401:                        // else try without these
402:                        // else throw SQLException
403:
404:                        if (((RowSet) caller).getUsername() != null) {
405:                            return ds.getConnection(((RowSet) caller)
406:                                    .getUsername(), ((RowSet) caller)
407:                                    .getPassword());
408:                        } else {
409:                            return ds.getConnection();
410:                        }
411:                    } catch (javax.naming.NamingException ex) {
412:                        SQLException sqlEx = new SQLException();
413:                        sqlEx.initCause(ex);
414:                        throw sqlEx;
415:                    }
416:                } else if (((RowSet) caller).getUrl() != null) {
417:                    // Connect using the driver manager.
418:                    return DriverManager.getConnection(((RowSet) caller)
419:                            .getUrl(), ((RowSet) caller).getUsername(),
420:                            ((RowSet) caller).getPassword());
421:                } else {
422:                    return null;
423:                }
424:            }
425:
426:            /**
427:             * Sets the parameter placeholders
428:             * in the rowset's command (the given <code>PreparedStatement</code>
429:             * object) with the parameters in the given array.
430:             * This method, called internally by the method
431:             * <code>CachedRowSetXReader.readData</code>, reads each parameter, and
432:             * based on its type, determines the correct
433:             * <code>PreparedStatement.setXXX</code> method to use for setting
434:             * that parameter.
435:             *
436:             * @param params an array of parameters to be used with the given
437:             *               <code>PreparedStatement</code> object
438:             * @param pstmt  the <code>PreparedStatement</code> object that is the
439:             *               command for the calling rowset and into which
440:             *               the given parameters are to be set
441:             * @throws SQLException if an access error occurs
442:             */
443:            private void decodeParams(Object[] params, PreparedStatement pstmt)
444:                    throws SQLException {
445:                // There is a corresponding decodeParams in JdbcRowSetImpl
446:                // which does the same as this method. This is a design flaw.
447:                // Update the JdbcRowSetImpl.decodeParams when you update
448:                // this method.
449:
450:                // Adding the same comments to JdbcRowSetImpl.decodeParams.
451:
452:                int arraySize;
453:                Object[] param = null;
454:
455:                for (int i = 0; i < params.length; i++) {
456:                    if (params[i] instanceof  Object[]) {
457:                        param = (Object[]) params[i];
458:
459:                        if (param.length == 2) {
460:                            if (param[0] == null) {
461:                                pstmt.setNull(i + 1, ((Integer) param[1])
462:                                        .intValue());
463:                                continue;
464:                            }
465:
466:                            if (param[0] instanceof  java.sql.Date
467:                                    || param[0] instanceof  java.sql.Time
468:                                    || param[0] instanceof  java.sql.Timestamp) {
469:                                System.err.println(rb
470:                                        .getString("DETECTED_A_DATE")); //NOI18N
471:                                if (param[1] instanceof  java.util.Calendar) {
472:                                    System.err.println(rb
473:                                            .getString("DETECTED_A_CALENDAR")); //NOI18N
474:                                    pstmt.setDate(i + 1,
475:                                            (java.sql.Date) param[0],
476:                                            (java.util.Calendar) param[1]);
477:                                    continue;
478:                                } else {
479:                                    throw new SQLException(
480:                                            rb
481:                                                    .getString("UNABLE_TO_DEDUCE_PARAM_TYPE")); //NOI18N
482:                                }
483:                            }
484:
485:                            if (param[0] instanceof  Reader) {
486:                                pstmt.setCharacterStream(i + 1,
487:                                        (Reader) param[0], ((Integer) param[1])
488:                                                .intValue());
489:                                continue;
490:                            }
491:
492:                            /*
493:                             * What's left should be setObject(int, Object, scale)
494:                             */
495:                            if (param[1] instanceof  Integer) {
496:                                pstmt.setObject(i + 1, param[0],
497:                                        ((Integer) param[1]).intValue());
498:                                continue;
499:                            }
500:
501:                        } else if (param.length == 3) {
502:
503:                            if (param[0] == null) {
504:                                pstmt.setNull(i + 1, ((Integer) param[1])
505:                                        .intValue(), (String) param[2]);
506:                                continue;
507:                            }
508:
509:                            if (param[0] instanceof  java.io.InputStream) {
510:                                switch (((Integer) param[2]).intValue()) {
511:                                case CachedRowSetXImpl.UNICODE_STREAM_PARAM:
512:                                    pstmt.setUnicodeStream(i + 1,
513:                                            (java.io.InputStream) param[0],
514:                                            ((Integer) param[1]).intValue());
515:                                case CachedRowSetXImpl.BINARY_STREAM_PARAM:
516:                                    pstmt.setBinaryStream(i + 1,
517:                                            (java.io.InputStream) param[0],
518:                                            ((Integer) param[1]).intValue());
519:                                case CachedRowSetXImpl.ASCII_STREAM_PARAM:
520:                                    pstmt.setAsciiStream(i + 1,
521:                                            (java.io.InputStream) param[0],
522:                                            ((Integer) param[1]).intValue());
523:                                default:
524:                                    throw new SQLException(
525:                                            rb
526:                                                    .getString("UNABLE_TO_DEDUCE_PARAM_TYPE")); //NOI18N
527:                                }
528:                            }
529:
530:                            /*
531:                             * no point at looking at the first element now;
532:                             * what's left must be the setObject() cases.
533:                             */
534:                            if (param[1] instanceof  Integer
535:                                    && param[2] instanceof  Integer) {
536:                                pstmt.setObject(i + 1, param[0],
537:                                        ((Integer) param[1]).intValue(),
538:                                        ((Integer) param[2]).intValue());
539:                                continue;
540:                            }
541:
542:                            throw new SQLException(rb
543:                                    .getString("UNABLE_TO_DEDUCE_PARAM_TYPE")); //NOI18N
544:
545:                        } else {
546:                            // common case - this catches all SQL92 types
547:                            pstmt.setObject(i + 1, params[i]);
548:                            continue;
549:                        }
550:                    } else {
551:                        // Try to get all the params to be set here
552:                        pstmt.setObject(i + 1, params[i]);
553:
554:                    }
555:                }
556:            }
557:
558:            /**
559:             * Assists in determining whether the current connection was created by this
560:             * CachedRowSet to ensure incorrect connections are not prematurely terminated.
561:             *
562:             * @return a boolean giving the status of whether the connection has been closed.
563:             */
564:            protected boolean getCloseConnection() {
565:                if (userCon == true)
566:                    return false;
567:
568:                return true;
569:            }
570:
571:            /**
572:             *  This sets the start position in the ResultSet from where to begin. This is
573:             * called by the Reader in the CachedRowSetXImpl to set the position on the page
574:             * to begin populating from.
575:             * @param pos integer indicating the position in the <code>ResultSet</code> to begin
576:             *        populating from.
577:             */
578:            public void setStartPosition(int pos) {
579:                startPosition = pos;
580:            }
581:
582:        }
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