mirror of https://github.com/apache/openjpa.git
Resolving JIRA report OPENJPA-63 for better pessimistic lock support for DB2. Instead of the usual "for update" clause, db2 dictionary will now use "with rr use and keep update locks" clause.
A couple of additional changes were necessary to properly detect the version of DB2 currently in use. git-svn-id: https://svn.apache.org/repos/asf/incubator/openjpa/trunk@482189 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Kevin W. Sutter
parent
ca45e3292a
commit
970f647622
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@ -1,144 +1,162 @@
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/*
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* Copyright 2006 The Apache Software Foundation.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.openjpa.jdbc.sql;
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import java.sql.Connection;
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import java.sql.SQLException;
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import java.util.Arrays;
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import org.apache.openjpa.jdbc.schema.Sequence;
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/**
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* Dictionary for IBM DB2 database.
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*/
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public class DB2Dictionary
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extends AbstractDB2Dictionary {
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public DB2Dictionary() {
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platform = "DB2";
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validationSQL = "SELECT DISTINCT(CURRENT TIMESTAMP) FROM "
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+ "SYSIBM.SYSTABLES";
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supportsSelectEndIndex = true;
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nextSequenceQuery = "VALUES NEXTVAL FOR {0}";
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binaryTypeName = "BLOB(1M)";
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longVarbinaryTypeName = "BLOB(1M)";
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varbinaryTypeName = "BLOB(1M)";
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clobTypeName = "CLOB(1M)";
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longVarcharTypeName = "LONG VARCHAR";
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fixedSizeTypeNameSet.addAll(Arrays.asList(new String[]{
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"LONG VARCHAR FOR BIT DATA", "LONG VARCHAR", "LONG VARGRAPHIC",
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}));
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maxConstraintNameLength = 18;
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maxIndexNameLength = 18;
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maxColumnNameLength = 30;
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supportsDeferredConstraints = false;
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supportsDefaultDeleteAction = false;
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supportsAlterTableWithDropColumn = false;
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supportsNullTableForGetColumns = false;
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reservedWordSet.addAll(Arrays.asList(new String[]{
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"AFTER", "ALIAS", "ALLOW", "APPLICATION", "ASSOCIATE", "ASUTIME",
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"AUDIT", "AUX", "AUXILIARY", "BEFORE", "BINARY", "BUFFERPOOL",
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"CACHE", "CALL", "CALLED", "CAPTURE", "CARDINALITY", "CCSID",
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"CLUSTER", "COLLECTION", "COLLID", "COMMENT", "CONCAT",
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"CONDITION", "CONTAINS", "COUNT_BIG", "CURRENT_LC_CTYPE",
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"CURRENT_PATH", "CURRENT_SERVER", "CURRENT_TIMEZONE", "CYCLE",
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"DATA", "DATABASE", "DAYS", "DB2GENERAL", "DB2GENRL", "DB2SQL",
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"DBINFO", "DEFAULTS", "DEFINITION", "DETERMINISTIC", "DISALLOW",
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"DO", "DSNHATTR", "DSSIZE", "DYNAMIC", "EACH", "EDITPROC", "ELSEIF",
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"ENCODING", "END-EXEC1", "ERASE", "EXCLUDING", "EXIT", "FENCED",
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"FIELDPROC", "FILE", "FINAL", "FREE", "FUNCTION", "GENERAL",
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"GENERATED", "GRAPHIC", "HANDLER", "HOLD", "HOURS", "IF",
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"INCLUDING", "INCREMENT", "INDEX", "INHERIT", "INOUT", "INTEGRITY",
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"ISOBID", "ITERATE", "JAR", "JAVA", "LABEL", "LC_CTYPE", "LEAVE",
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"LINKTYPE", "LOCALE", "LOCATOR", "LOCATORS", "LOCK", "LOCKMAX",
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"LOCKSIZE", "LONG", "LOOP", "MAXVALUE", "MICROSECOND",
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"MICROSECONDS", "MINUTES", "MINVALUE", "MODE", "MODIFIES", "MONTHS",
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"NEW", "NEW_TABLE", "NOCACHE", "NOCYCLE", "NODENAME", "NODENUMBER",
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"NOMAXVALUE", "NOMINVALUE", "NOORDER", "NULLS", "NUMPARTS", "OBID",
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"OLD", "OLD_TABLE", "OPTIMIZATION", "OPTIMIZE", "OUT", "OVERRIDING",
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"PACKAGE", "PARAMETER", "PART", "PARTITION", "PATH", "PIECESIZE",
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"PLAN", "PRIQTY", "PROGRAM", "PSID", "QUERYNO", "READS", "RECOVERY",
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"REFERENCING", "RELEASE", "RENAME", "REPEAT", "RESET", "RESIGNAL",
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"RESTART", "RESULT", "RESULT_SET_LOCATOR", "RETURN", "RETURNS",
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"ROUTINE", "ROW", "RRN", "RUN", "SAVEPOINT", "SCRATCHPAD",
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"SECONDS", "SECQTY", "SECURITY", "SENSITIVE", "SIGNAL", "SIMPLE",
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"SOURCE", "SPECIFIC", "SQLID", "STANDARD", "START", "STATIC",
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"STAY", "STOGROUP", "STORES", "STYLE", "SUBPAGES", "SYNONYM",
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"SYSFUN", "SYSIBM", "SYSPROC", "SYSTEM", "TABLESPACE", "TRIGGER",
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"TYPE", "UNDO", "UNTIL", "VALIDPROC", "VARIABLE", "VARIANT", "VCAT",
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"VOLUMES", "WHILE", "WLM", "YEARS",
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}));
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}
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public boolean supportsRandomAccessResultSet(Select sel,
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boolean forUpdate) {
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return !forUpdate
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&& super.supportsRandomAccessResultSet(sel, forUpdate);
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}
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protected void appendSelectRange(SQLBuffer buf, long start, long end) {
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// appends the literal range string, since DB2 is unable to handle
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// a bound parameter for it
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buf.append(" FETCH FIRST ").append(Long.toString(end)).
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append(" ROWS ONLY");
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}
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public String[] getCreateSequenceSQL(Sequence seq) {
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String[] sql = super.getCreateSequenceSQL(seq);
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if (seq.getAllocate() > 1)
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sql[0] += " CACHE " + seq.getAllocate();
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return sql;
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}
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protected String getSequencesSQL(String schemaName, String sequenceName) {
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StringBuffer buf = new StringBuffer();
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buf.append("SELECT SEQSCHEMA AS SEQUENCE_SCHEMA, ").
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append("SEQNAME AS SEQUENCE_NAME FROM SYSCAT.SEQUENCES");
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if (schemaName != null || sequenceName != null)
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buf.append(" WHERE ");
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if (schemaName != null) {
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buf.append("SEQSCHEMA = ?");
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if (sequenceName != null)
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buf.append(" AND ");
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}
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if (sequenceName != null)
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buf.append("SEQNAME = ?");
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return buf.toString();
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}
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public Connection decorate(Connection conn)
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throws SQLException {
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// some versions of the DB2 driver seem to default to
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// READ_UNCOMMITTED, which will prevent locking from working
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// (multiple SELECT ... FOR UPDATE statements are allowed on
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// the same instance); if we have not overridden the
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// transaction isolation in the configuration, default to
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// TRANSACTION_READ_COMMITTED
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conn = super.decorate(conn);
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if (conf.getTransactionIsolationConstant() == -1
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&& conn.getTransactionIsolation() < conn.TRANSACTION_READ_COMMITTED)
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conn.setTransactionIsolation(conn.TRANSACTION_READ_COMMITTED);
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return conn;
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}
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}
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/*
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* Copyright 2006 The Apache Software Foundation.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.openjpa.jdbc.sql;
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import java.sql.Connection;
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import java.sql.DatabaseMetaData;
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import java.sql.SQLException;
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import java.util.Arrays;
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import org.apache.openjpa.jdbc.schema.Sequence;
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/**
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* Dictionary for IBM DB2 database.
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*/
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public class DB2Dictionary
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extends AbstractDB2Dictionary {
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public DB2Dictionary() {
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platform = "DB2";
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validationSQL = "SELECT DISTINCT(CURRENT TIMESTAMP) FROM "
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+ "SYSIBM.SYSTABLES";
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supportsSelectEndIndex = true;
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nextSequenceQuery = "VALUES NEXTVAL FOR {0}";
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binaryTypeName = "BLOB(1M)";
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longVarbinaryTypeName = "BLOB(1M)";
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varbinaryTypeName = "BLOB(1M)";
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clobTypeName = "CLOB(1M)";
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longVarcharTypeName = "LONG VARCHAR";
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fixedSizeTypeNameSet.addAll(Arrays.asList(new String[]{
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"LONG VARCHAR FOR BIT DATA", "LONG VARCHAR", "LONG VARGRAPHIC",
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}));
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maxConstraintNameLength = 18;
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maxIndexNameLength = 18;
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maxColumnNameLength = 30;
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supportsDeferredConstraints = false;
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supportsDefaultDeleteAction = false;
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supportsAlterTableWithDropColumn = false;
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supportsNullTableForGetColumns = false;
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reservedWordSet.addAll(Arrays.asList(new String[]{
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"AFTER", "ALIAS", "ALLOW", "APPLICATION", "ASSOCIATE", "ASUTIME",
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"AUDIT", "AUX", "AUXILIARY", "BEFORE", "BINARY", "BUFFERPOOL",
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"CACHE", "CALL", "CALLED", "CAPTURE", "CARDINALITY", "CCSID",
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"CLUSTER", "COLLECTION", "COLLID", "COMMENT", "CONCAT",
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"CONDITION", "CONTAINS", "COUNT_BIG", "CURRENT_LC_CTYPE",
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"CURRENT_PATH", "CURRENT_SERVER", "CURRENT_TIMEZONE", "CYCLE",
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"DATA", "DATABASE", "DAYS", "DB2GENERAL", "DB2GENRL", "DB2SQL",
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"DBINFO", "DEFAULTS", "DEFINITION", "DETERMINISTIC", "DISALLOW",
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"DO", "DSNHATTR", "DSSIZE", "DYNAMIC", "EACH", "EDITPROC", "ELSEIF",
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"ENCODING", "END-EXEC1", "ERASE", "EXCLUDING", "EXIT", "FENCED",
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"FIELDPROC", "FILE", "FINAL", "FREE", "FUNCTION", "GENERAL",
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"GENERATED", "GRAPHIC", "HANDLER", "HOLD", "HOURS", "IF",
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"INCLUDING", "INCREMENT", "INDEX", "INHERIT", "INOUT", "INTEGRITY",
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"ISOBID", "ITERATE", "JAR", "JAVA", "LABEL", "LC_CTYPE", "LEAVE",
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"LINKTYPE", "LOCALE", "LOCATOR", "LOCATORS", "LOCK", "LOCKMAX",
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"LOCKSIZE", "LONG", "LOOP", "MAXVALUE", "MICROSECOND",
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"MICROSECONDS", "MINUTES", "MINVALUE", "MODE", "MODIFIES", "MONTHS",
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"NEW", "NEW_TABLE", "NOCACHE", "NOCYCLE", "NODENAME", "NODENUMBER",
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"NOMAXVALUE", "NOMINVALUE", "NOORDER", "NULLS", "NUMPARTS", "OBID",
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"OLD", "OLD_TABLE", "OPTIMIZATION", "OPTIMIZE", "OUT", "OVERRIDING",
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"PACKAGE", "PARAMETER", "PART", "PARTITION", "PATH", "PIECESIZE",
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"PLAN", "PRIQTY", "PROGRAM", "PSID", "QUERYNO", "READS", "RECOVERY",
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"REFERENCING", "RELEASE", "RENAME", "REPEAT", "RESET", "RESIGNAL",
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"RESTART", "RESULT", "RESULT_SET_LOCATOR", "RETURN", "RETURNS",
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"ROUTINE", "ROW", "RRN", "RUN", "SAVEPOINT", "SCRATCHPAD",
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"SECONDS", "SECQTY", "SECURITY", "SENSITIVE", "SIGNAL", "SIMPLE",
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"SOURCE", "SPECIFIC", "SQLID", "STANDARD", "START", "STATIC",
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"STAY", "STOGROUP", "STORES", "STYLE", "SUBPAGES", "SYNONYM",
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"SYSFUN", "SYSIBM", "SYSPROC", "SYSTEM", "TABLESPACE", "TRIGGER",
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"TYPE", "UNDO", "UNTIL", "VALIDPROC", "VARIABLE", "VARIANT", "VCAT",
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"VOLUMES", "WHILE", "WLM", "YEARS",
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}));
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}
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public boolean supportsRandomAccessResultSet(Select sel,
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boolean forUpdate) {
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return !forUpdate
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&& super.supportsRandomAccessResultSet(sel, forUpdate);
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}
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protected void appendSelectRange(SQLBuffer buf, long start, long end) {
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// appends the literal range string, since DB2 is unable to handle
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// a bound parameter for it
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buf.append(" FETCH FIRST ").append(Long.toString(end)).
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append(" ROWS ONLY");
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}
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public String[] getCreateSequenceSQL(Sequence seq) {
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String[] sql = super.getCreateSequenceSQL(seq);
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if (seq.getAllocate() > 1)
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sql[0] += " CACHE " + seq.getAllocate();
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return sql;
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}
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protected String getSequencesSQL(String schemaName, String sequenceName) {
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StringBuffer buf = new StringBuffer();
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buf.append("SELECT SEQSCHEMA AS SEQUENCE_SCHEMA, ").
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append("SEQNAME AS SEQUENCE_NAME FROM SYSCAT.SEQUENCES");
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if (schemaName != null || sequenceName != null)
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buf.append(" WHERE ");
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if (schemaName != null) {
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buf.append("SEQSCHEMA = ?");
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if (sequenceName != null)
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buf.append(" AND ");
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}
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if (sequenceName != null)
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buf.append("SEQNAME = ?");
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return buf.toString();
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}
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public Connection decorate(Connection conn)
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throws SQLException {
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// some versions of the DB2 driver seem to default to
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// READ_UNCOMMITTED, which will prevent locking from working
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// (multiple SELECT ... FOR UPDATE statements are allowed on
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// the same instance); if we have not overridden the
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// transaction isolation in the configuration, default to
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// TRANSACTION_READ_COMMITTED
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conn = super.decorate(conn);
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if (conf.getTransactionIsolationConstant() == -1
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&& conn.getTransactionIsolation() < conn.TRANSACTION_READ_COMMITTED)
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conn.setTransactionIsolation(conn.TRANSACTION_READ_COMMITTED);
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return conn;
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}
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public void connectedConfiguration(Connection conn) throws SQLException {
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super.connectedConfiguration(conn);
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DatabaseMetaData metaData = conn.getMetaData();
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if (metaData.getJDBCMajorVersion() >= 3) {
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int maj = metaData.getDatabaseMajorVersion();
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int min = metaData.getDatabaseMinorVersion();
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if (maj >= 9 || (maj == 8 && min >= 2)) {
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supportsLockingWithMultipleTables = true;
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supportsLockingWithInnerJoin = true;
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supportsLockingWithOuterJoin = true;
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forUpdateClause = "WITH RR USE AND KEEP UPDATE LOCKS";
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}
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}
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}
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}
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