| 1 | /* |
| 2 | |
| 3 | Derby - Class org.apache.derby.impl.jdbc.EmbedConnectionContext |
| 4 | |
| 5 | Copyright 1997, 2004 The Apache Software Foundation or its licensors, as applicable. |
| 6 | |
| 7 | Licensed under the Apache License, Version 2.0 (the "License"); |
| 8 | you may not use this file except in compliance with the License. |
| 9 | You may obtain a copy of the License at |
| 10 | |
| 11 | http://www.apache.org/licenses/LICENSE-2.0 |
| 12 | |
| 13 | Unless required by applicable law or agreed to in writing, software |
| 14 | distributed under the License is distributed on an "AS IS" BASIS, |
| 15 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 16 | See the License for the specific language governing permissions and |
| 17 | limitations under the License. |
| 18 | |
| 19 | */ |
| 20 | |
| 21 | //depot/main/java/org.apache.derby.impl.jdbc/EmbedConnectionContext.java#24 - edit change 16899 (text) |
| 22 | package org.apache.derby.impl.jdbc; |
| 23 | |
| 24 | // This is the recommended super-class for all contexts. |
| 25 | import org.apache.derby.iapi.services.context.ContextImpl; |
| 26 | import org.apache.derby.iapi.services.context.ContextManager; |
| 27 | import org.apache.derby.iapi.sql.conn.StatementContext; |
| 28 | import org.apache.derby.iapi.jdbc.ConnectionContext; |
| 29 | import org.apache.derby.iapi.error.StandardException; |
| 30 | import org.apache.derby.iapi.sql.ResultSet; |
| 31 | |
| 32 | import org.apache.derby.iapi.error.ExceptionSeverity; |
| 33 | import java.sql.SQLException; |
| 34 | import java.util.Vector; |
| 35 | import java.util.Enumeration; |
| 36 | /** |
| 37 | @author djd |
| 38 | */ |
| 39 | class EmbedConnectionContext extends ContextImpl |
| 40 | implements ConnectionContext |
| 41 | { |
| 42 | |
| 43 | /** |
| 44 | We hold a soft reference to the connection so that when the application |
| 45 | releases its reference to the Connection without closing it, its finalize |
| 46 | method will be called, which will then close the connection. If a direct |
| 47 | reference is used here, such a Connection will never be closed or garbage |
| 48 | collected as modules hold onto the ContextManager and thus there would |
| 49 | be a direct reference through this object. |
| 50 | */ |
| 51 | private java.lang.ref.SoftReference connRef; |
| 52 | |
| 53 | |
| 54 | EmbedConnectionContext(ContextManager cm, EmbedConnection conn) { |
| 55 | super(cm, ConnectionContext.CONTEXT_ID); |
| 56 | |
| 57 | connRef = new java.lang.ref.SoftReference(conn); |
| 58 | } |
| 59 | |
| 60 | public void cleanupOnError(Throwable error) { |
| 61 | |
| 62 | if (connRef == null) |
| 63 | return; |
| 64 | |
| 65 | EmbedConnection conn = (EmbedConnection) connRef.get(); |
| 66 | |
| 67 | if (error instanceof StandardException) { |
| 68 | |
| 69 | StandardException se = (StandardException) error; |
| 70 | if (se.getSeverity() < ExceptionSeverity.SESSION_SEVERITY) { |
| 71 | |
| 72 | // any error in auto commit mode that does not close the |
| 73 | // session will cause a rollback, thus remvoing the need |
| 74 | // for any commit. We could check this flag under autoCommit |
| 75 | // being true but the flag is ignored when autoCommit is false |
| 76 | // so why add the extra check |
| 77 | if (conn != null) { |
| 78 | conn.needCommit = false; |
| 79 | } |
| 80 | return; |
| 81 | } |
| 82 | } |
| 83 | |
| 84 | // This may be a transaction without connection. |
| 85 | if (conn != null) |
| 86 | conn.setInactive(); // make the connection inactive & empty |
| 87 | |
| 88 | connRef = null; |
| 89 | popMe(); |
| 90 | } |
| 91 | |
| 92 | //public java.sql.Connection getEmbedConnection() |
| 93 | //{ |
| 94 | /// return conn; |
| 95 | //} |
| 96 | |
| 97 | /** |
| 98 | Get a connection equivalent to the call |
| 99 | <PRE> |
| 100 | DriverManager.getConnection("jdbc:default:connection"); |
| 101 | </PRE> |
| 102 | */ |
| 103 | public java.sql.Connection getNestedConnection(boolean internal) throws SQLException { |
| 104 | |
| 105 | EmbedConnection conn = (EmbedConnection) connRef.get(); |
| 106 | |
| 107 | if ((conn == null) || conn.isClosed()) |
| 108 | throw Util.noCurrentConnection(); |
| 109 | |
| 110 | if (!internal) { |
| 111 | StatementContext sc = conn.getLanguageConnection().getStatementContext(); |
| 112 | if ((sc == null) || (sc.getSQLAllowed() < org.apache.derby.catalog.types.RoutineAliasInfo.MODIFIES_SQL_DATA)) |
| 113 | throw Util.noCurrentConnection(); |
| 114 | } |
| 115 | |
| 116 | return conn.getLocalDriver().getNewNestedConnection(conn); |
| 117 | } |
| 118 | |
| 119 | /** |
| 120 | * Get a jdbc ResultSet based on the execution ResultSet. |
| 121 | * |
| 122 | * @param executionResultSet a result set as gotten from execution |
| 123 | * |
| 124 | */ |
| 125 | public java.sql.ResultSet getResultSet |
| 126 | ( |
| 127 | ResultSet executionResultSet |
| 128 | ) throws SQLException |
| 129 | { |
| 130 | EmbedConnection conn = (EmbedConnection) connRef.get(); |
| 131 | |
| 132 | EmbedResultSet rs = conn.getLocalDriver().newEmbedResultSet(conn, executionResultSet, |
| 133 | false, (EmbedStatement) null, true); |
| 134 | return rs; |
| 135 | } |
| 136 | } |