Source Code Cross Referenced for ScriptWriterText.java in  » Database-DBMS » hsql » org » hsqldb » scriptio » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » hsql » org.hsqldb.scriptio 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* Copyright (c) 2001-2005, The HSQL Development Group
002:         * All rights reserved.
003:         *
004:         * Redistribution and use in source and binary forms, with or without
005:         * modification, are permitted provided that the following conditions are met:
006:         *
007:         * Redistributions of source code must retain the above copyright notice, this
008:         * list of conditions and the following disclaimer.
009:         *
010:         * Redistributions in binary form must reproduce the above copyright notice,
011:         * this list of conditions and the following disclaimer in the documentation
012:         * and/or other materials provided with the distribution.
013:         *
014:         * Neither the name of the HSQL Development Group nor the names of its
015:         * contributors may be used to endorse or promote products derived from this
016:         * software without specific prior written permission.
017:         *
018:         * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
019:         * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
020:         * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
021:         * ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
022:         * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
023:         * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
024:         * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
025:         * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
026:         * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
027:         * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
028:         * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
029:         */
030:
031:        package org.hsqldb.scriptio;
032:
033:        import java.io.IOException;
034:
035:        import org.hsqldb.Database;
036:        import org.hsqldb.HsqlException;
037:        import org.hsqldb.HsqlNameManager;
038:        import org.hsqldb.HsqlNameManager.HsqlName;
039:        import org.hsqldb.NumberSequence;
040:        import org.hsqldb.Session;
041:        import org.hsqldb.Table;
042:        import org.hsqldb.rowio.RowOutputTextLog;
043:
044:        /**
045:         * Handles all scripting and logging operations. A script consists of two blocks:<p>
046:         *
047:         * DDL: SQL statements for table and user definitions
048:         * DATA: INSERT statements for memory tables
049:         *
050:         * This happens as part of the CHECKPOINT and SHUTDOWN COMPACT
051:         * process. In this case, the
052:         * DATA block contains the CACHED table data as well.<p>
053:         *
054:         * A related use for this class is for saving a current snapshot of the
055:         * database data to a user-defined file with the SCRIPT command
056:         *
057:         * A log consists of SQL statements of different types. Each statement is
058:         * encoded as ASCII and saved.
059:         *
060:         *
061:         * @author fredt@users
062:         * @version 1.8.0
063:         * @since 1.7.2
064:         */
065:        public class ScriptWriterText extends ScriptWriterBase {
066:
067:            RowOutputTextLog rowOut;
068:
069:            // todo - perhaps move this global into a lib utility class
070:            public static final byte[] BYTES_LINE_SEP;
071:
072:            static {
073:                String sLineSep = System.getProperty("line.separator", "\n");
074:
075:                BYTES_LINE_SEP = sLineSep.getBytes();
076:            }
077:
078:            static final byte[] BYTES_COMMIT = "COMMIT".getBytes();
079:            static final byte[] BYTES_INSERT_INTO = "INSERT INTO ".getBytes();
080:            static final byte[] BYTES_VALUES = " VALUES(".getBytes();
081:            static final byte[] BYTES_TERM = ")".getBytes();
082:            static final byte[] BYTES_DELETE_FROM = "DELETE FROM ".getBytes();
083:            static final byte[] BYTES_WHERE = " WHERE ".getBytes();
084:            static final byte[] BYTES_SEQUENCE = "ALTER SEQUENCE ".getBytes();
085:            static final byte[] BYTES_SEQUENCE_MID = " RESTART WITH "
086:                    .getBytes();
087:            static final byte[] BYTES_C_ID_INIT = "/*C".getBytes();
088:            static final byte[] BYTES_C_ID_TERM = "*/".getBytes();
089:            static final byte[] BYTES_SCHEMA = "SET SCHEMA ".getBytes();
090:
091:            ScriptWriterText() {
092:            }
093:
094:            public ScriptWriterText(Database db, String file,
095:                    boolean includeCachedData, boolean newFile, boolean isDump)
096:                    throws HsqlException {
097:                super (db, file, includeCachedData, newFile, isDump);
098:            }
099:
100:            protected void initBuffers() {
101:                rowOut = new RowOutputTextLog();
102:            }
103:
104:            protected void writeDataTerm() throws IOException {
105:            }
106:
107:            protected void addSessionId(Session session) throws IOException {
108:
109:                if (session == null) {
110:                    return;
111:                }
112:
113:                if (session != currentSession) {
114:                    rowOut.write(BYTES_C_ID_INIT);
115:                    rowOut.writeIntData(session.getId());
116:                    rowOut.write(BYTES_C_ID_TERM);
117:
118:                    currentSession = session;
119:                }
120:
121:                if (schemaToLog != session.loggedSchema) {
122:                    writeSchemaStatement(schemaToLog);
123:
124:                    session.loggedSchema = schemaToLog;
125:                }
126:            }
127:
128:            private void writeSchemaStatement(HsqlName schema) {
129:
130:                rowOut.write(BYTES_SCHEMA);
131:                rowOut.writeString(schema.statementName);
132:                rowOut.write(BYTES_LINE_SEP);
133:            }
134:
135:            public void writeLogStatement(Session session, String s)
136:                    throws IOException, HsqlException {
137:
138:                schemaToLog = session.currentSchema;
139:                busyWriting = true;
140:
141:                rowOut.reset();
142:                addSessionId(session);
143:                rowOut.writeString(s);
144:                rowOut.write(BYTES_LINE_SEP);
145:                fileStreamOut.write(rowOut.getBuffer(), 0, rowOut.size());
146:
147:                byteCount += rowOut.size();
148:                needsSync = true;
149:                busyWriting = false;
150:
151:                if (forceSync || writeDelay == 0) {
152:                    sync();
153:                }
154:            }
155:
156:            protected void writeRow(Session session, Table table, Object[] data)
157:                    throws HsqlException, IOException {
158:
159:                busyWriting = true;
160:
161:                rowOut.reset();
162:                ((RowOutputTextLog) rowOut)
163:                        .setMode(RowOutputTextLog.MODE_INSERT);
164:                addSessionId(session);
165:                rowOut.write(BYTES_INSERT_INTO);
166:                rowOut.writeString(table.getName().statementName);
167:                rowOut.write(BYTES_VALUES);
168:                rowOut.writeData(data, table);
169:                rowOut.write(BYTES_TERM);
170:                rowOut.write(BYTES_LINE_SEP);
171:                fileStreamOut.write(rowOut.getBuffer(), 0, rowOut.size());
172:
173:                byteCount += rowOut.size();
174:                needsSync |= session.isAutoCommit();
175:                busyWriting = false;
176:
177:                if (forceSync || writeDelay == 0) {
178:                    sync();
179:                }
180:            }
181:
182:            protected void writeTableInit(Table t) throws HsqlException,
183:                    IOException {
184:
185:                if (t.isEmpty(currentSession)) {
186:                    return;
187:                }
188:
189:                if (schemaToLog == currentSession.loggedSchema) {
190:                    return;
191:                }
192:
193:                rowOut.reset();
194:                writeSchemaStatement(t.getName().schema);
195:                fileStreamOut.write(rowOut.getBuffer(), 0, rowOut.size());
196:
197:                currentSession.loggedSchema = schemaToLog;
198:            }
199:
200:            public void writeInsertStatement(Session session, Table table,
201:                    Object[] data) throws HsqlException, IOException {
202:
203:                schemaToLog = table.getName().schema;
204:
205:                writeRow(session, table, data);
206:            }
207:
208:            public void writeDeleteStatement(Session session, Table table,
209:                    Object[] data) throws HsqlException, IOException {
210:
211:                schemaToLog = table.getName().schema;
212:                busyWriting = true;
213:
214:                rowOut.reset();
215:                ((RowOutputTextLog) rowOut)
216:                        .setMode(RowOutputTextLog.MODE_DELETE);
217:                addSessionId(session);
218:                rowOut.write(BYTES_DELETE_FROM);
219:                rowOut.writeString(table.getName().statementName);
220:                rowOut.write(BYTES_WHERE);
221:                rowOut.writeData(table.getColumnCount(),
222:                        table.getColumnTypes(), data, table.columnList, table
223:                                .getPrimaryKey());
224:                rowOut.write(BYTES_LINE_SEP);
225:                fileStreamOut.write(rowOut.getBuffer(), 0, rowOut.size());
226:
227:                byteCount += rowOut.size();
228:                needsSync |= session.isAutoCommit();
229:                busyWriting = false;
230:
231:                if (forceSync || writeDelay == 0) {
232:                    sync();
233:                }
234:            }
235:
236:            public void writeSequenceStatement(Session session,
237:                    NumberSequence seq) throws HsqlException, IOException {
238:
239:                schemaToLog = seq.getName().schema;
240:                busyWriting = true;
241:
242:                rowOut.reset();
243:                addSessionId(session);
244:                rowOut.write(BYTES_SEQUENCE);
245:                rowOut.writeString(seq.getName().statementName);
246:                rowOut.write(BYTES_SEQUENCE_MID);
247:                rowOut.writeLongData(seq.peek());
248:                rowOut.write(BYTES_LINE_SEP);
249:                fileStreamOut.write(rowOut.getBuffer(), 0, rowOut.size());
250:
251:                byteCount += rowOut.size();
252:                needsSync = true;
253:                busyWriting = false;
254:
255:                if (forceSync || writeDelay == 0) {
256:                    sync();
257:                }
258:            }
259:
260:            public void writeCommitStatement(Session session)
261:                    throws HsqlException, IOException {
262:
263:                busyWriting = true;
264:
265:                rowOut.reset();
266:                addSessionId(session);
267:                rowOut.write(BYTES_COMMIT);
268:                rowOut.write(BYTES_LINE_SEP);
269:                fileStreamOut.write(rowOut.getBuffer(), 0, rowOut.size());
270:
271:                byteCount += rowOut.size();
272:                needsSync = true;
273:                busyWriting = false;
274:
275:                if (forceSync || writeDelay == 0) {
276:                    sync();
277:                }
278:            }
279:
280:            protected void finalize() {
281:                sync();
282:            }
283:        }
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