Source Code Cross Referenced for tsResultSet.java in  » Database-DBMS » TinySQL » com » sqlmagic » tinysql » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » TinySQL » com.sqlmagic.tinysql 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * tsResultSet.java - Result Set object for tinySQL.
003:         * 
004:         * Copyright 1996, Brian C. Jepson
005:         *                 (bjepson@ids.net)
006:         * $Author: davis $
007:         * $Date: 2004/12/18 21:26:18 $
008:         * $Revision: 1.1 $
009:         *
010:         * This library is free software; you can redistribute it and/or
011:         * modify it under the terms of the GNU Lesser General Public
012:         * License as published by the Free Software Foundation; either
013:         * version 2.1 of the License, or (at your option) any later version.
014:         *
015:         * This library is distributed in the hope that it will be useful,
016:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
017:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
018:         * Lesser General Public License for more details.
019:         *
020:         * You should have received a copy of the GNU Lesser General Public
021:         * License along with this library; if not, write to the Free Software
022:         * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
023:         */
024:
025:        package com.sqlmagic.tinysql;
026:
027:        import java.util.*;
028:        import java.lang.*;
029:        import java.io.*;
030:        import java.sql.*;
031:
032:        /*
033:         *
034:         * tsResultSet - object to hold query results
035:         *
036:         * @author Thomas Morgner <mgs@sherito.org> Changed tsResultSet to support java.sql.Types,
037:         * a custom fetchsize, and storing a state for unfinished queries.
038:         * I also marked all members as private and use access-Functions to set or query
039:         * this ResultSets properties.
040:         */
041:        public class tsResultSet {
042:
043:            private Vector rows;// = new Vector();    // all the rows
044:            private Vector rsColumns;// = new Vector(); // all the tsColumn objects
045:            private Vector selectColumns;// = new Vector(); // all the selected columns
046:            private Vector orderByColumns;// = new Vector(); // all ORDER BY columns
047:            private Vector tables; // SQL-Query information
048:            private tinySQLWhere whereC;
049:
050:            private int fetchsize;
051:            private int windowStart;
052:            private int level;
053:            private tinySQL dbengine;
054:            private Hashtable sTables;
055:            private String orderType;
056:            private boolean distinct;
057:            private int type;
058:            private boolean eof;
059:            private boolean groupedColumns = false;
060:            public String newLine = System.getProperty("line.separator");
061:
062:            /*
063:             * The constructor with no arguments is provided for the Metadata
064:             * ResulSets.
065:             */
066:            public tsResultSet() {
067:                this ((tinySQLWhere) null, (tinySQL) null);
068:            }
069:
070:            public tsResultSet(tinySQLWhere w, tinySQL dbeng) {
071:                dbengine = dbeng;
072:                windowStart = 0;
073:                whereC = w;
074:                rows = new Vector();
075:                rsColumns = new Vector();
076:                selectColumns = new Vector();
077:                orderByColumns = new Vector();
078:                tables = new Vector();
079:            }
080:
081:            /*
082:             * This method sets the initial state of the ResultSet, including adding
083:             * any grouping or ordering information.  If the ResultSet contains
084:             * summary functions, then a single row is added to the ResultSet initially.
085:             * If no rows are found that match any specified where clauses, this initial
086:             * row will be returned.
087:             */
088:            public void setState(int pstate, Hashtable ptables,
089:                    String inputOrderType, boolean inputDistinct)
090:                    throws tinySQLException {
091:                int i;
092:                tsRow record = new tsRow();
093:                tsColumn initializeColumn;
094:                sTables = ptables;
095:                orderType = inputOrderType;
096:                distinct = inputDistinct;
097:                level = pstate;
098:                if (groupedColumns) {
099:                    /*
100:                     *       Initialize the ResultSet with any not null summary functions
101:                     *       such as COUNT = 0 
102:                     */
103:                    for (i = 0; i < rsColumns.size(); i++) {
104:                        initializeColumn = (tsColumn) rsColumns.elementAt(i);
105:                        /*
106:                         *          Evaluate all functions before adding the
107:                         *          column to the output record.
108:                         */
109:                        initializeColumn.updateFunctions();
110:                        if (initializeColumn.isNotNull())
111:                            record.put(initializeColumn.name, initializeColumn
112:                                    .getString());
113:                    }
114:                    addRow(record);
115:                }
116:            }
117:
118:            public void setType(int type) {
119:                if ((type == ResultSet.TYPE_FORWARD_ONLY)
120:                        || (type == ResultSet.TYPE_SCROLL_SENSITIVE)
121:                        || (type == ResultSet.TYPE_SCROLL_INSENSITIVE))
122:
123:                    this .type = type;
124:            }
125:
126:            public int getType() {
127:                return type;
128:            }
129:
130:            public void setFetchSize(int i) {
131:                fetchsize = i;
132:            }
133:
134:            public int getFetchSize() {
135:                return fetchsize;
136:            }
137:
138:            public void addColumn(tsColumn col) {
139:                int i;
140:                boolean addTable;
141:                tinySQLTable checkTable;
142:                rsColumns.addElement(col);
143:                if (col.getContext("SELECT"))
144:                    selectColumns.addElement(col);
145:                if (col.getContext("ORDER"))
146:                    orderByColumns.addElement(col);
147:                if (col.isGroupedColumn())
148:                    groupedColumns = true;
149:                /*
150:                 *    Add the table that this column belongs to if required
151:                 */
152:                addTable = true;
153:                if (col.columnTable != (tinySQLTable) null) {
154:                    for (i = 0; i < tables.size(); i++) {
155:                        checkTable = (tinySQLTable) tables.elementAt(i);
156:                        if (checkTable.table.equals(col.columnTable.table)) {
157:                            addTable = false;
158:                            break;
159:                        }
160:                    }
161:                    if (addTable) {
162:                        tables.addElement(col.columnTable);
163:                    }
164:                }
165:            }
166:
167:            public boolean isGrouped() {
168:                return groupedColumns;
169:            }
170:
171:            public boolean getMoreResults(int newPos, int fetchsize) {
172:                this .fetchsize = fetchsize;
173:                if (dbengine != null) {
174:                    try {
175:                        if (type != ResultSet.TYPE_SCROLL_INSENSITIVE) {
176:                            rows.removeAllElements();
177:                            windowStart = newPos;
178:                        }
179:                        dbengine.contSelectStatement(this );
180:                        if (level != 0) {
181:                            eof = false;
182:                            return eof;
183:                        }
184:                    } catch (tinySQLException e) {
185:                    }
186:                }
187:                eof = true;
188:                return eof;
189:            }
190:
191:            /*
192:             * The following method adds a row to the ResultSet.  If sortRows is true then
193:             * the row will be added to the appriate location in the ResultSet (which 
194:             * defaults to the sort order of the columns being fetched).  If sort os false
195:             * the row is just appended.
196:             */
197:            public boolean addRow(tsRow row) {
198:                return addRow(row, true);
199:            }
200:
201:            public boolean addRow(tsRow row, boolean sortRows) {
202:                int i;
203:                boolean sortUp = true;
204:                tsRow sortRow;
205:                if (!sortRows) {
206:                    rows.addElement(row);
207:                    return true;
208:                }
209:                if (orderType != (String) null)
210:                    if (orderType.startsWith("DESC"))
211:                        sortUp = false;
212:                /*
213:                 *    Pass the list of ORDER BY columns to the new row to enable
214:                 *    compareTo method.
215:                 */
216:                row.setOrderBy(orderByColumns);
217:                if (rows.size() > 0) {
218:                    /*
219:                     *       Insert or append the row depending upon the ORDER BY
220:                     *       conditions and a comparison of the new and the existing row.
221:                     */
222:                    if (sortUp) {
223:                        for (i = rows.size() - 1; i > -1; i--) {
224:                            sortRow = (tsRow) rows.elementAt(i);
225:                            if (row.compareTo(sortRow) < 0)
226:                                continue;
227:                            if (row.compareTo(sortRow) == 0 & distinct)
228:                                return true;
229:                            if (i == rows.size() - 1)
230:                                rows.addElement(row);
231:                            else
232:                                rows.insertElementAt(row, i + 1);
233:                            return true;
234:                        }
235:                    } else {
236:                        for (i = rows.size() - 1; i > -1; i--) {
237:                            sortRow = (tsRow) rows.elementAt(i);
238:                            if (row.compareTo(sortRow) > 0)
239:                                continue;
240:                            if (row.compareTo(sortRow) == 0 & distinct)
241:                                return true;
242:                            if (i == rows.size() - 1)
243:                                rows.addElement(row);
244:                            else
245:                                rows.insertElementAt(row, i + 1);
246:                            return true;
247:                        }
248:                    }
249:                    rows.insertElementAt(row, 0);
250:                    return true;
251:                }
252:                rows.addElement(row);
253:                if ((fetchsize > 0) && (rows.size() >= fetchsize))
254:                    return false;
255:                return true;
256:            }
257:
258:            /*
259:             * The following methods update a particular row in the result set.
260:             */
261:            public void updateRow(tsRow inputRow) {
262:                updateRow(inputRow, rows.size() - 1);
263:            }
264:
265:            public void updateRow(tsRow inputRow, int rowIndex) {
266:                rows.setElementAt(inputRow, rowIndex);
267:            }
268:
269:            public Vector getTables() {
270:                return tables;
271:            }
272:
273:            public int getLevel() {
274:                return level;
275:            }
276:
277:            public void setLevel(int l) {
278:                level = l;
279:            }
280:
281:            public Hashtable getTableState() {
282:                return sTables;
283:            }
284:
285:            public tinySQLWhere getWhereClause() {
286:                return whereC;
287:            }
288:
289:            /*
290:             * Returns the number of SELECT columns in the result set 
291:             */
292:            public int getColumnCount() {
293:                return selectColumns.size();
294:            }
295:
296:            /*
297:             * Returns the number of columns in the result set including ORDER BY,
298:             * GROUP BY columns.
299:             */
300:            public int numcols() {
301:                return rsColumns.size();
302:            }
303:
304:            /*
305:             * Update all the columns in the ResultSet.
306:             */
307:            public void updateColumns(String inputColumnName,
308:                    String inputColumnValue) throws tinySQLException {
309:                int i;
310:                tsColumn tcol;
311:                for (i = 0; i < rsColumns.size(); i++) {
312:                    tcol = (tsColumn) rsColumns.elementAt(i);
313:                    tcol.update(inputColumnName, inputColumnValue);
314:                }
315:            }
316:
317:            /*
318:             * Returns the number of rows in the result set.
319:             */
320:            public int size() {
321:                return rows.size();
322:            }
323:
324:            /*
325:             * Returns the tsRow at a given row offset (starts with zero).
326:             *
327:             * @param i the row offset/index
328:             */
329:            public tsRow rowAt(int row) {
330:                int i;
331:                if (row >= (windowStart + rows.size())) {
332:                    getMoreResults(row, fetchsize);
333:                }
334:                i = row - windowStart;
335:                if (i < rows.size()) {
336:                    return (tsRow) rows.elementAt(i);
337:                }
338:                return null;
339:            }
340:
341:            /*
342:             * Returns the tsColumn at a given column offset (starts with zero).
343:             * The second argument is true if all columns (as opposed to just SELECT
344:             * columns ) are to be returned.
345:             */
346:            public tsColumn columnAtIndex(int i) {
347:                return columnAtIndex(i, false);
348:            }
349:
350:            public tsColumn columnAtIndex(int i, boolean allColumns) {
351:                if (allColumns)
352:                    return (tsColumn) rsColumns.elementAt(i);
353:                else
354:                    return (tsColumn) selectColumns.elementAt(i);
355:
356:            }
357:
358:            /* 
359:             * Debugging method to dump out the result set
360:             */
361:            public String toString() {
362:                int i;
363:                tsColumn tcol;
364:                StringBuffer outputBuffer;
365:                /*
366:                 *    Display columns
367:                 */
368:                outputBuffer = new StringBuffer(newLine
369:                        + "Columns in ResultSet" + newLine);
370:                for (i = 0; i < rsColumns.size(); i++) {
371:                    tcol = (tsColumn) rsColumns.elementAt(i);
372:                    outputBuffer.append(tcol.toString());
373:                }
374:                outputBuffer.append(newLine + "Rows in tsResultSet" + newLine);
375:                for (i = 0; i < size(); i++) {
376:                    tsRow row = rowAt(i);
377:                    outputBuffer.append(row.toString() + newLine);
378:                }
379:                return outputBuffer.toString();
380:            }
381:        }
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