| 1 | /* ============================================================= |
| 2 | * SmallSQL : a free Java DBMS library for the Java(tm) platform |
| 3 | * ============================================================= |
| 4 | * |
| 5 | * (C) Copyright 2004-2006, by Volker Berlin. |
| 6 | * |
| 7 | * Project Info: http://www.smallsql.de/ |
| 8 | * |
| 9 | * This library is free software; you can redistribute it and/or modify it |
| 10 | * under the terms of the GNU Lesser General Public License as published by |
| 11 | * the Free Software Foundation; either version 2.1 of the License, or |
| 12 | * (at your option) any later version. |
| 13 | * |
| 14 | * This library is distributed in the hope that it will be useful, but |
| 15 | * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
| 16 | * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public |
| 17 | * License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU Lesser General Public |
| 20 | * License along with this library; if not, write to the Free Software |
| 21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, |
| 22 | * USA. |
| 23 | * |
| 24 | * [Java is a trademark or registered trademark of Sun Microsystems, Inc. |
| 25 | * in the United States and other countries.] |
| 26 | * |
| 27 | * --------------- |
| 28 | * SSConnection.java |
| 29 | * --------------- |
| 30 | * Author: Volker Berlin |
| 31 | * |
| 32 | */ |
| 33 | package smallsql.database; |
| 34 | |
| 35 | import java.io.RandomAccessFile; |
| 36 | import java.sql.*; |
| 37 | import java.util.Map; |
| 38 | import java.util.List; |
| 39 | import java.util.ArrayList; |
| 40 | import java.util.Properties; |
| 41 | |
| 42 | |
| 43 | public class SSConnection implements Connection { |
| 44 | |
| 45 | private Database database; |
| 46 | private boolean autoCommit = true; |
| 47 | int isolationLevel = TRANSACTION_READ_COMMITTED; // see also getDefaultTransactionIsolation |
| 48 | int serializeCount; |
| 49 | private List commitPages = new ArrayList(); |
| 50 | /** The time on which a transaction is starting. */ |
| 51 | private long transactionTime; |
| 52 | private SSDatabaseMetaData metadata; |
| 53 | private int holdability; |
| 54 | final Logger log = new Logger(); |
| 55 | |
| 56 | SSConnection( Properties props ) throws SQLException{ |
| 57 | String name = props.getProperty("dbpath"); |
| 58 | boolean create = "true".equals(props.getProperty("create")); |
| 59 | database = Database.getDatabase(name, this, create); |
| 60 | metadata = new SSDatabaseMetaData(this); |
| 61 | } |
| 62 | |
| 63 | |
| 64 | /** |
| 65 | * @param returnNull If null is a valid return value for the case of not connected to a database. |
| 66 | * @throws SQLException If not connected and returnNull is false. |
| 67 | */ |
| 68 | Database getDatabase(boolean returnNull) throws SQLException{ |
| 69 | if(!returnNull && database == null) throw Utils.createSQLException("You are not connected with a Database."); |
| 70 | return database; |
| 71 | } |
| 72 | |
| 73 | public Statement createStatement() throws SQLException { |
| 74 | return new SSStatement(this); |
| 75 | } |
| 76 | public PreparedStatement prepareStatement(String sql) throws SQLException { |
| 77 | return new SSPreparedStatement( this, sql); |
| 78 | } |
| 79 | public CallableStatement prepareCall(String sql) throws SQLException { |
| 80 | return new SSCallableStatement( this, sql); |
| 81 | } |
| 82 | public String nativeSQL(String sql) throws SQLException { |
| 83 | return sql; |
| 84 | } |
| 85 | |
| 86 | |
| 87 | public void setAutoCommit(boolean autoCommit) throws SQLException { |
| 88 | if(log.isLogging()) log.println("AutoCommit:"+autoCommit); |
| 89 | if(this.autoCommit != autoCommit){ |
| 90 | commit(); |
| 91 | this.autoCommit = autoCommit; |
| 92 | } |
| 93 | } |
| 94 | |
| 95 | |
| 96 | public boolean getAutoCommit() throws SQLException { |
| 97 | return autoCommit; |
| 98 | } |
| 99 | |
| 100 | |
| 101 | /** |
| 102 | * Add a page for later commit or rollback. |
| 103 | */ |
| 104 | void add(StorePage storePage) throws SQLException{ |
| 105 | testClosedConnection(); |
| 106 | commitPages.add(storePage); |
| 107 | } |
| 108 | |
| 109 | |
| 110 | public void commit() throws SQLException { |
| 111 | try{ |
| 112 | log.println("Commit"); |
| 113 | testClosedConnection(); |
| 114 | synchronized(commitPages){ |
| 115 | int count = commitPages.size(); |
| 116 | for(int i=0; i<count; i++){ |
| 117 | StorePage page = (StorePage)commitPages.get(i); |
| 118 | page.commit(); |
| 119 | } |
| 120 | for(int i=0; i<count; i++){ |
| 121 | StorePage page = (StorePage)commitPages.get(i); |
| 122 | page.freeLock(); |
| 123 | } |
| 124 | commitPages.clear(); |
| 125 | transactionTime = System.currentTimeMillis(); |
| 126 | } |
| 127 | }catch(Throwable e){ |
| 128 | rollback(); |
| 129 | throw Utils.createSQLException(e); |
| 130 | } |
| 131 | } |
| 132 | |
| 133 | |
| 134 | /** |
| 135 | * Discard all changes of a file because it was deleted. |
| 136 | */ |
| 137 | void rollbackFile(RandomAccessFile raFile) throws SQLException{ |
| 138 | testClosedConnection(); |
| 139 | // remove the all commits that point to this table |
| 140 | for(int i=commitPages.size()-1; i>=0; i--){ |
| 141 | StorePage page = (StorePage)commitPages.get(i); |
| 142 | if(page.raFile == raFile){ |
| 143 | page.rollback(); |
| 144 | page.freeLock(); |
| 145 | } |
| 146 | } |
| 147 | } |
| 148 | |
| 149 | |
| 150 | void rollback(int savepoint) throws SQLException{ |
| 151 | testClosedConnection(); |
| 152 | for(int i = commitPages.size()-1; i>=savepoint; i--){ |
| 153 | StorePage page = (StorePage)commitPages.remove(i); |
| 154 | page.rollback(); |
| 155 | page.freeLock(); |
| 156 | } |
| 157 | } |
| 158 | |
| 159 | |
| 160 | public void rollback() throws SQLException { |
| 161 | log.println("Rollback"); |
| 162 | testClosedConnection(); |
| 163 | synchronized(commitPages){ |
| 164 | int count = commitPages.size(); |
| 165 | for(int i=0; i<count; i++){ |
| 166 | StorePage page = (StorePage)commitPages.get(i); |
| 167 | page.rollback(); |
| 168 | page.freeLock(); |
| 169 | } |
| 170 | commitPages.clear(); |
| 171 | transactionTime = System.currentTimeMillis(); |
| 172 | } |
| 173 | } |
| 174 | |
| 175 | |
| 176 | public void close() throws SQLException { |
| 177 | rollback(); |
| 178 | database = null; |
| 179 | commitPages = null; |
| 180 | Database.closeConnection(this); |
| 181 | } |
| 182 | |
| 183 | |
| 184 | final void testClosedConnection() throws SQLException{ |
| 185 | if(isClosed()) throw Utils.createSQLException("Connection was closed."); |
| 186 | } |
| 187 | |
| 188 | public boolean isClosed() throws SQLException { |
| 189 | return (commitPages == null); |
| 190 | } |
| 191 | |
| 192 | |
| 193 | public DatabaseMetaData getMetaData() throws SQLException { |
| 194 | return metadata; |
| 195 | } |
| 196 | |
| 197 | |
| 198 | public void setReadOnly(boolean readOnly) throws SQLException { |
| 199 | } |
| 200 | |
| 201 | |
| 202 | public boolean isReadOnly() throws SQLException { |
| 203 | return false; |
| 204 | } |
| 205 | |
| 206 | |
| 207 | public void setCatalog(String catalog) throws SQLException { |
| 208 | if(isClosed()) throw Utils.createSQLException("Connection is allready closed"); |
| 209 | database = Database.getDatabase(catalog, this, false); |
| 210 | } |
| 211 | |
| 212 | |
| 213 | public String getCatalog() throws SQLException { |
| 214 | if(database == null) |
| 215 | return ""; |
| 216 | return database.getName(); |
| 217 | } |
| 218 | |
| 219 | |
| 220 | public void setTransactionIsolation(int level) throws SQLException { |
| 221 | if(!metadata.supportsTransactionIsolationLevel(level)) |
| 222 | throw Utils.createSQLException("Unknow Transaction Isolation Level:"+level); |
| 223 | isolationLevel = level; |
| 224 | } |
| 225 | |
| 226 | |
| 227 | public int getTransactionIsolation() throws SQLException { |
| 228 | return isolationLevel; |
| 229 | } |
| 230 | |
| 231 | |
| 232 | public SQLWarning getWarnings() throws SQLException { |
| 233 | return null; |
| 234 | } |
| 235 | |
| 236 | |
| 237 | public void clearWarnings() throws SQLException { |
| 238 | } |
| 239 | |
| 240 | |
| 241 | public Statement createStatement(int resultSetType, int resultSetConcurrency) throws SQLException { |
| 242 | return new SSStatement( this, resultSetType, resultSetConcurrency); |
| 243 | } |
| 244 | |
| 245 | |
| 246 | public PreparedStatement prepareStatement(String sql, int resultSetType, int resultSetConcurrency) throws SQLException { |
| 247 | return new SSPreparedStatement( this, sql, resultSetType, resultSetConcurrency); |
| 248 | } |
| 249 | |
| 250 | |
| 251 | public CallableStatement prepareCall(String sql, int resultSetType, int resultSetConcurrency) throws SQLException { |
| 252 | return new SSCallableStatement( this, sql, resultSetType, resultSetConcurrency); |
| 253 | } |
| 254 | |
| 255 | |
| 256 | public Map getTypeMap() throws SQLException { |
| 257 | return null; |
| 258 | } |
| 259 | |
| 260 | |
| 261 | public void setTypeMap(Map map) throws SQLException { |
| 262 | } |
| 263 | |
| 264 | |
| 265 | public void setHoldability(int holdability) throws SQLException { |
| 266 | this.holdability = holdability; |
| 267 | } |
| 268 | |
| 269 | |
| 270 | public int getHoldability() throws SQLException { |
| 271 | return holdability; |
| 272 | } |
| 273 | |
| 274 | |
| 275 | int getSavepoint() throws SQLException{ |
| 276 | testClosedConnection(); |
| 277 | return commitPages.size(); |
| 278 | } |
| 279 | |
| 280 | |
| 281 | public Savepoint setSavepoint() throws SQLException { |
| 282 | return new SSSavepoint(getSavepoint(), null, transactionTime); |
| 283 | } |
| 284 | |
| 285 | |
| 286 | public Savepoint setSavepoint(String name) throws SQLException { |
| 287 | return new SSSavepoint(getSavepoint(), name, transactionTime); |
| 288 | } |
| 289 | |
| 290 | |
| 291 | public void rollback(Savepoint savepoint) throws SQLException { |
| 292 | if(savepoint instanceof SSSavepoint){ |
| 293 | if(((SSSavepoint)savepoint).transactionTime != transactionTime){ |
| 294 | throw Utils.createSQLException("Savepoint is not valid for this transaction."); |
| 295 | } |
| 296 | rollback( savepoint.getSavepointId() ); |
| 297 | return; |
| 298 | } |
| 299 | throw Utils.createSQLException("Savepoint is not valid for this driver."+savepoint); |
| 300 | } |
| 301 | |
| 302 | |
| 303 | public void releaseSavepoint(Savepoint savepoint) throws SQLException { |
| 304 | if(savepoint instanceof SSSavepoint){ |
| 305 | ((SSSavepoint)savepoint).transactionTime = 0; |
| 306 | return; |
| 307 | } |
| 308 | throw Utils.createSQLException("Savepoint is not valid for this driver."+savepoint); |
| 309 | } |
| 310 | |
| 311 | |
| 312 | public Statement createStatement(int resultSetType, int resultSetConcurrency, int resultSetHoldability) throws SQLException { |
| 313 | //TODO resultSetHoldability |
| 314 | return new SSStatement( this, resultSetType, resultSetConcurrency); |
| 315 | } |
| 316 | public PreparedStatement prepareStatement(String sql, int resultSetType, int resultSetConcurrency, int resultSetHoldability) throws SQLException { |
| 317 | //TODO resultSetHoldability |
| 318 | return new SSPreparedStatement( this, sql); |
| 319 | } |
| 320 | public CallableStatement prepareCall(String sql, int resultSetType, int resultSetConcurrency, int resultSetHoldability) throws SQLException { |
| 321 | //TODO resultSetHoldability |
| 322 | return new SSCallableStatement( this, sql, resultSetType, resultSetConcurrency); |
| 323 | } |
| 324 | public PreparedStatement prepareStatement(String sql, int autoGeneratedKeys) throws SQLException { |
| 325 | //TODO autoGeneratedKeys |
| 326 | return new SSPreparedStatement( this, sql); |
| 327 | } |
| 328 | public PreparedStatement prepareStatement(String sql, int[] columnIndexes) throws SQLException { |
| 329 | //TODO autoGeneratedKeys |
| 330 | return new SSPreparedStatement( this, sql); |
| 331 | } |
| 332 | public PreparedStatement prepareStatement(String sql, String[] columnNames) throws SQLException { |
| 333 | //TODO autoGeneratedKeys |
| 334 | return new SSPreparedStatement( this, sql); |
| 335 | } |
| 336 | } |