Source Code Cross Referenced for SQLServer2000.java in  » Workflow-Engines » pegasus-2.1.0 » org » griphyn » vdl » dbdriver » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Workflow Engines » pegasus 2.1.0 » org.griphyn.vdl.dbdriver 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * This file or a portion of this file is licensed under the terms of
003:         * the Globus Toolkit Public License, found in file ../GTPL, or at
004:         * http://www.globus.org/toolkit/download/license.html. This notice must
005:         * appear in redistributions of this file, with or without modification.
006:         *
007:         * Redistributions of this Software, with or without modification, must
008:         * reproduce the GTPL in: (1) the Software, or (2) the Documentation or
009:         * some other similar material which is provided with the Software (if
010:         * any).
011:         *
012:         * Copyright 1999-2004 University of Chicago and The University of
013:         * Southern California. All rights reserved.
014:         */
015:        package org.griphyn.vdl.dbdriver;
016:
017:        import org.griphyn.vdl.dbdriver.DatabaseDriver;
018:        import java.sql.*;
019:        import java.util.*;
020:        import org.griphyn.vdl.util.*;
021:
022:        /**
023:         * This class implements the driver API for the Microsoft SQL Server
024:         * 2000 database. Please note that due to the limited capabilities of
025:         * the Microsoft-provided free JDBC driver for SQL-Server, it will
026:         * <i>not</i> work as a database driver. However, if you have access to
027:         * the commercial JDBC3-compatible driver, you are encouraged to
028:         * implement the missing functionality.
029:         *
030:         * @author Jens-S. Vöckler
031:         * @author Yong Zhao
032:         * @version $Revision: 50 $
033:         *
034:         * @see DatabaseDriver
035:         * @see org.griphyn.vdl.dbschema
036:         */
037:        public class SQLServer2000 extends DatabaseDriver {
038:            /**
039:             * Default constructor. As the constructor will do nothing, please use
040:             * the connect method to obtain a database connection. 
041:             *
042:             * @see #connect( String, Properties, Set )
043:             */
044:            public SQLServer2000() {
045:                super ();
046:            }
047:
048:            /**
049:             * Establish a connection to your database. The parameters will often
050:             * be ignored or abused for different purposes on different backends.
051:             * It is assumed that the connection is not in auto-commit mode, and
052:             * explicit commits must be issued. 
053:             *
054:             * @param url      the contact string to database, or schema location
055:             * @param info     additional parameters, usually username and password
056:             * @param tables   is a set of all table names in the schema. The
057:             *                 existence of all tables will be checked to verify
058:             *                 that the schema is active in the database. 
059:             * @return true if the connection succeeded, false otherwise. Usually,
060:             * false is returned, if the any of the tables or sequences is missing. 
061:             * @exception if the driver is incapable of establishing a connection.
062:             */
063:            public boolean connect(String url, Properties info, Set tables)
064:                    throws SQLException, ClassNotFoundException {
065:                // load PostGreSQL driver class into memory
066:                return this .connect(
067:                        "com.microsoft.jdbc.sqlserver.SQLServerDriver", url,
068:                        info, tables);
069:
070:            }
071:
072:            /**
073:             * Determines, if the backend is expensive, and results should be cached.
074:             * Ideally, this will move transparently into the backend itself.
075:             * @return true if caching is advisable, false for no caching.
076:             */
077:            public boolean cachingMakesSense() {
078:                return true;
079:            }
080:
081:            /**
082:             * Quotes a string that may contain special SQL characters.
083:             * @param s is the raw string.
084:             * @return the quoted string, which may be just the input string.
085:             */
086:            public String quote(String s) {
087:                if (s.indexOf('\'') != -1) {
088:                    StringBuffer result = new StringBuffer();
089:                    for (int i = 0; i < s.length(); ++i) {
090:                        char ch = s.charAt(i);
091:                        result.append(ch);
092:                        if (ch == '\'')
093:                            result.append(ch);
094:                    }
095:                    return result.toString();
096:                } else {
097:                    return s;
098:                }
099:            }
100:
101:            /**
102:             * Obtains the next value from a sequence. JDBC drivers which allow
103:             * explicit access to sequence generator will return a valid value 
104:             * in this function. All other JDBC drivers should return -1.
105:             *
106:             * @param name is the name of the sequence.
107:             * @return the next sequence number. 
108:             * @exception if something goes wrong while fetching the new value. 
109:             */
110:            public long sequence1(String name) throws SQLException {
111:                throw new SQLException(this .getClass().getName()
112:                        + ": Method not implemented, "
113:                        + "please notify vds-support@griphyn.org");
114:            }
115:
116:            /**
117:             * Obtains the sequence value for the current statement. JDBC driver
118:             * that permit insertion of NULL into auto-increment value should use
119:             * this method to return the inserted ID value via the statements
120:             * getGeneratedKeys(). Other JDBC drivers should treat return the
121:             * parametric id.
122:             *
123:             * @param s is a statment or prepared statement
124:             * @param name is the name of the sequence.
125:             * @param pos is the column number of the auto-increment column.
126:             * @return the next sequence number. 
127:             * @exception if something goes wrong while fetching the new value. 
128:             */
129:            public long sequence2(Statement s, String name, int pos)
130:                    throws SQLException {
131:                throw new SQLException(this .getClass().getName()
132:                        + ": Method not implemented, "
133:                        + "please notify vds-support@griphyn.org");
134:            }
135:
136:            /**
137:             * Predicate to tell the schema, if using a string instead of number
138:             * will result in the speedier index scans instead of sequential scans.
139:             * PostGreSQL has this problem, but using strings in the place of 
140:             * integers may not be universally portable.
141:             *
142:             * @return true, if using strings instead of integers and bigints
143:             * will yield better performance. 
144:             *
145:             */
146:            public boolean preferString() {
147:                return false;
148:            }
149:        }
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