Source Code Cross Referenced for OracleBlobConverter.java in  » Testing » PolePosition-0.20 » com » versant » core » jdbc » sql » conv » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Testing » PolePosition 0.20 » com.versant.core.jdbc.sql.conv 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright (c) 1998 - 2005 Versant Corporation
003:         * All rights reserved. This program and the accompanying materials
004:         * are made available under the terms of the Eclipse Public License v1.0
005:         * which accompanies this distribution, and is available at
006:         * http://www.eclipse.org/legal/epl-v10.html
007:         *
008:         * Contributors:
009:         * Versant Corporation - initial API and implementation
010:         */
011:        package com.versant.core.jdbc.sql.conv;
012:
013:        import com.versant.core.jdbc.JdbcConverter;
014:        import com.versant.core.jdbc.JdbcConverterFactory;
015:        import com.versant.core.jdbc.JdbcTypeRegistry;
016:        import com.versant.core.jdbc.metadata.JdbcColumn;
017:
018:        import java.sql.PreparedStatement;
019:        import java.sql.SQLException;
020:        import java.sql.ResultSet;
021:
022:        import javax.jdo.JDOFatalDataStoreException; //todo: appears only in throws-clause
023:
024:        import org.polepos.teams.jdo.*;
025:
026:        import com.versant.core.common.BindingSupportImpl;
027:
028:        // import oracle.sql.BLOB;
029:
030:        /**
031:         * This converter converts byte[] stored in Oracle BLOB columns to
032:         * and from SQL.
033:         * @keep-all
034:         */
035:        public class OracleBlobConverter implements  JdbcConverter {
036:
037:            public OracleBlobConverter() {
038:                VoaEdited.exception();
039:            }
040:
041:            public static class Factory extends NoArgJdbcConverterFactory {
042:
043:                private OracleBlobConverter converter;
044:
045:                /**
046:                 * Create a converter for col using args as parameters. Return null if
047:                 * no converter is required.
048:                 */
049:                public JdbcConverter createJdbcConverter(JdbcColumn col,
050:                        Object args, JdbcTypeRegistry jdbcTypeRegistry) {
051:                    if (converter == null)
052:                        converter = new OracleBlobConverter();
053:                    return converter;
054:                }
055:
056:            }
057:
058:            private static final byte[] EMPTY_BYTE_ARRAY = new byte[0];
059:
060:            /**
061:             * Is this converter for an Oracle style LOB column? Oracle LOBs require
062:             * a hard coded a value into the insert/update statement instead of using
063:             * a replaceable parameter and then select the value (if not null) and
064:             * modify it.
065:             */
066:            public boolean isOracleStyleLOB() {
067:                return true;
068:            }
069:
070:            /**
071:             * This is only called if isOracleStyleLOB returns true. Get the String
072:             * to be embedded in an SQL insert/update statement when the value for
073:             * this column is not null (e.g. "empty_clob()");
074:             */
075:            public String getOracleStyleLOBNotNullString() {
076:                return "empty_blob()";
077:            }
078:
079:            /**
080:             * Get the value of col from rs at position index.
081:             * @exception SQLException on SQL errors
082:             * @exception JDOFatalDataStoreException if the ResultSet value is invalid
083:             */
084:            public Object get(ResultSet rs, int index, JdbcColumn col)
085:                    throws SQLException, JDOFatalDataStoreException {
086:
087:                VoaEdited.exception();
088:                return null;
089:
090:                //        BLOB blob = (BLOB)rs.getBlob(index);
091:                //        if (blob == null || blob.isEmptyLob()) return null;
092:                //        if (blob.length() == 0) return EMPTY_BYTE_ARRAY;
093:                //        return blob.getBytes(1, (int)blob.length());
094:
095:            }
096:
097:            /**
098:             * Set parameter index on ps to value (for col).
099:             * @exception SQLException on SQL errors
100:             * @exception JDOFatalDataStoreException if value is invalid
101:             */
102:            public void set(PreparedStatement ps, int index, JdbcColumn col,
103:                    Object value) throws SQLException,
104:                    JDOFatalDataStoreException {
105:                throw BindingSupportImpl.getInstance().fatalDatastore(
106:                        "set(ps..) called");
107:            }
108:
109:            /**
110:             * Set parameter index on ps to value (for col). This special form is used
111:             * when the value to be set is available as an int to avoid creating
112:             * an wrapper instance.
113:             * @exception SQLException on SQL errors
114:             * @exception JDOFatalDataStoreException if value is invalid
115:             */
116:            public void set(PreparedStatement ps, int index, JdbcColumn col,
117:                    int value) throws SQLException, JDOFatalDataStoreException {
118:                throw BindingSupportImpl.getInstance().fatalDatastore(
119:                        "set(..int) called");
120:            }
121:
122:            /**
123:             * This method is called for converters that return true for
124:             * isOracleStyleLOB. The value at index in rs will contain the LOB to
125:             * be updated.
126:             * @exception SQLException on SQL errors
127:             * @exception JDOFatalDataStoreException if value is invalid
128:             */
129:            public void set(ResultSet rs, int index, JdbcColumn col,
130:                    Object value) throws SQLException,
131:                    JDOFatalDataStoreException {
132:
133:                VoaEdited.exception();
134:
135:                //        BLOB blob = (BLOB)rs.getBlob(index);
136:                //        blob.putBytes(1, (byte[])value);
137:
138:                // Calling trim leaks cursors - we make new CLOBs for every update to
139:                // avoid this problem
140:                // DO NOT DO - blob.trim( ((byte[])value).length );
141:            }
142:
143:            /**
144:             * Get the type of our expected value objects (e.g. java.util.Locale
145:             * for a converter for Locale's).
146:             */
147:            public Class getValueType() {
148:                return byte[].class;
149:            }
150:
151:        }
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