--- /dev/null
+/*\r
+\r
+ Derby - Class org.apache.derby.impl.sql.execute.DropIndexConstantAction\r
+\r
+ Licensed to the Apache Software Foundation (ASF) under one or more\r
+ contributor license agreements. See the NOTICE file distributed with\r
+ this work for additional information regarding copyright ownership.\r
+ The ASF licenses this file to you under the Apache License, Version 2.0\r
+ (the "License"); you may not use this file except in compliance with\r
+ the License. You may obtain a copy of the License at\r
+\r
+ http://www.apache.org/licenses/LICENSE-2.0\r
+\r
+ Unless required by applicable law or agreed to in writing, software\r
+ distributed under the License is distributed on an "AS IS" BASIS,\r
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r
+ See the License for the specific language governing permissions and\r
+ limitations under the License.\r
+\r
+ */\r
+\r
+package org.apache.derby.impl.sql.execute;\r
+\r
+import org.apache.derby.iapi.services.sanity.SanityManager;\r
+import org.apache.derby.iapi.error.StandardException;\r
+import org.apache.derby.iapi.sql.conn.LanguageConnectionContext;\r
+\r
+import org.apache.derby.iapi.sql.depend.Dependency;\r
+import org.apache.derby.iapi.sql.depend.Dependent;\r
+\r
+import org.apache.derby.iapi.sql.dictionary.ConglomerateDescriptor;\r
+import org.apache.derby.iapi.sql.dictionary.DataDescriptorGenerator;\r
+import org.apache.derby.iapi.sql.dictionary.DataDictionary;\r
+import org.apache.derby.iapi.sql.dictionary.SchemaDescriptor;\r
+import org.apache.derby.iapi.sql.dictionary.TableDescriptor;\r
+\r
+import org.apache.derby.iapi.sql.depend.DependencyManager;\r
+import org.apache.derby.iapi.reference.SQLState;\r
+import org.apache.derby.iapi.sql.execute.ConstantAction;\r
+\r
+import org.apache.derby.iapi.sql.Activation;\r
+\r
+import org.apache.derby.iapi.store.access.TransactionController;\r
+\r
+import org.apache.derby.catalog.UUID;\r
+\r
+import java.util.Enumeration;\r
+\r
+\r
+/**\r
+ * This class describes actions that are ALWAYS performed for a\r
+ * DROP INDEX Statement at Execution time.\r
+ *\r
+ */\r
+\r
+class DropIndexConstantAction extends IndexConstantAction\r
+{\r
+\r
+ private String fullIndexName;\r
+ private long tableConglomerateId;\r
+\r
+\r
+ // CONSTRUCTORS\r
+\r
+ /**\r
+ * Make the ConstantAction for a DROP INDEX statement.\r
+ *\r
+ *\r
+ * @param fullIndexName Fully qualified index name\r
+ * @param indexName Index name.\r
+ * @param tableName The table name\r
+ * @param schemaName Schema that index lives in.\r
+ * @param tableId UUID for table\r
+ * @param tableConglomerateId heap Conglomerate Id for table\r
+ *\r
+ */\r
+ DropIndexConstantAction(\r
+ String fullIndexName,\r
+ String indexName,\r
+ String tableName,\r
+ String schemaName,\r
+ UUID tableId,\r
+ long tableConglomerateId)\r
+ {\r
+ super(tableId, indexName, tableName, schemaName);\r
+ this.fullIndexName = fullIndexName;\r
+ this.tableConglomerateId = tableConglomerateId;\r
+ }\r
+\r
+ // OBJECT METHODS\r
+\r
+ public String toString()\r
+ {\r
+ // Do not put this under SanityManager.DEBUG - it is needed for\r
+ // error reporting.\r
+ return "DROP INDEX " + fullIndexName;\r
+ }\r
+\r
+ // INTERFACE METHODS\r
+\r
+\r
+ /**\r
+ * This is the guts of the Execution-time logic for DROP INDEX.\r
+ *\r
+ *\r
+ * @exception StandardException Thrown on failure\r
+ */\r
+ public void executeConstantAction(Activation activation)\r
+ throws StandardException\r
+ {\r
+ TableDescriptor td;\r
+ ConglomerateDescriptor cd;\r
+\r
+ LanguageConnectionContext lcc = activation.getLanguageConnectionContext();\r
+ DataDictionary dd = lcc.getDataDictionary();\r
+ TransactionController tc = lcc.getTransactionExecute();\r
+\r
+ /*\r
+ ** Inform the data dictionary that we are about to write to it.\r
+ ** There are several calls to data dictionary "get" methods here\r
+ ** that might be done in "read" mode in the data dictionary, but\r
+ ** it seemed safer to do this whole operation in "write" mode.\r
+ **\r
+ ** We tell the data dictionary we're done writing at the end of\r
+ ** the transaction.\r
+ */\r
+ dd.startWriting(lcc);\r
+\r
+ // need to lock heap in exclusive mode first. Because we can't first\r
+ // shared lock the row in SYSCONGLOMERATES and later exclusively lock\r
+ // it, this is potential deadlock (track 879). Also td need to be\r
+ // gotten after we get the lock, a concurrent thread could be modifying\r
+ // table shape (track 3804, 3825)\r
+\r
+ // older version (or target) has to get td first, potential deadlock\r
+ if (tableConglomerateId == 0)\r
+ {\r
+ td = dd.getTableDescriptor(tableId);\r
+ if (td == null)\r
+ {\r
+ throw StandardException.newException(\r
+ SQLState.LANG_TABLE_NOT_FOUND_DURING_EXECUTION, tableName);\r
+ }\r
+ tableConglomerateId = td.getHeapConglomerateId();\r
+ }\r
+ lockTableForDDL(tc, tableConglomerateId, true);\r
+\r
+ td = dd.getTableDescriptor(tableId);\r
+ if (td == null)\r
+ {\r
+ throw StandardException.newException(SQLState.LANG_TABLE_NOT_FOUND_DURING_EXECUTION, tableName);\r
+ }\r
+\r
+ /*\r
+ ** If the schema descriptor is null, then\r
+ ** we must have just read ourselves in. \r
+ ** So we will get the corresponding schema\r
+ ** descriptor from the data dictionary.\r
+ */\r
+ SchemaDescriptor sd = dd.getSchemaDescriptor(schemaName, tc, true) ;\r
+\r
+ /* Get the conglomerate descriptor for the index, along\r
+ * with an exclusive row lock on the row in sys.sysconglomerates\r
+ * in order to ensure that no one else compiles against the\r
+ * index.\r
+ */\r
+ cd = dd.getConglomerateDescriptor(indexName, sd, true);\r
+\r
+ if (cd == null)\r
+ {\r
+ throw StandardException.newException(SQLState.LANG_INDEX_NOT_FOUND_DURING_EXECUTION, fullIndexName);\r
+ }\r
+\r
+ cd.drop(lcc, td);\r
+ }\r
+}\r
projects / Benchmarks_CSolver.git / blobdiff