Source Code Cross Referenced for OracleClobConverter.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:        import java.sql.Clob;
022:
023:        // import oracle.sql.CLOB;
024:
025:        import javax.jdo.JDOFatalDataStoreException; //todo: appears only in throws-clause
026:
027:        import org.polepos.teams.jdo.*;
028:
029:        import com.versant.core.common.BindingSupportImpl;
030:
031:        /**
032:         * This converter converts Strings stored in Oracle CLOB columns to
033:         * and from SQL.
034:         * @keep-all
035:         */
036:        public class OracleClobConverter implements  JdbcConverter {
037:
038:            public OracleClobConverter() {
039:                VoaEdited.exception();
040:            }
041:
042:            public static class Factory extends NoArgJdbcConverterFactory {
043:
044:                private OracleClobConverter converter;
045:
046:                /**
047:                 * Create a converter for col using args as parameters. Return null if
048:                 * no converter is required.
049:                 */
050:                public JdbcConverter createJdbcConverter(JdbcColumn col,
051:                        Object args, JdbcTypeRegistry jdbcTypeRegistry) {
052:                    if (converter == null)
053:                        converter = new OracleClobConverter();
054:                    return converter;
055:                }
056:
057:            }
058:
059:            /**
060:             * Is this converter for an Oracle style LOB column? Oracle LOBs require
061:             * a hard coded a value into the insert/update statement instead of using
062:             * a replaceable parameter and then select the value (if not null) and
063:             * modify it.
064:             */
065:            public boolean isOracleStyleLOB() {
066:                return true;
067:            }
068:
069:            /**
070:             * This is only called if isOracleStyleLOB returns true. Get the String
071:             * to be embedded in an SQL insert/update statement when the value for
072:             * this column is not null (e.g. "empty_clob()");
073:             */
074:            public String getOracleStyleLOBNotNullString() {
075:                return "empty_clob()";
076:            }
077:
078:            /**
079:             * Get the value of col from rs at position index.
080:             * @exception SQLException on SQL errors
081:             * @exception JDOFatalDataStoreException if the ResultSet value is invalid
082:             */
083:            public Object get(ResultSet rs, int index, JdbcColumn col)
084:                    throws SQLException, JDOFatalDataStoreException {
085:
086:                VoaEdited.exception();
087:                return null;
088:
089:                //        CLOB clob = (CLOB)rs.getClob(index);
090:                //        if (clob == null || clob.isEmptyLob()) return null;
091:                //        if (clob.length() == 0) return "";
092:                //        return clob.getSubString(1, (int)clob.length());
093:
094:            }
095:
096:            /**
097:             * Set parameter index on ps to value (for col).
098:             * @exception SQLException on SQL errors
099:             * @exception JDOFatalDataStoreException if value is invalid
100:             */
101:            public void set(PreparedStatement ps, int index, JdbcColumn col,
102:                    Object value) throws SQLException,
103:                    JDOFatalDataStoreException {
104:                throw BindingSupportImpl.getInstance().internal(
105:                        "set(ps..) called");
106:            }
107:
108:            /**
109:             * Set parameter index on ps to value (for col). This special form is used
110:             * when the value to be set is available as an int to avoid creating
111:             * an wrapper instance.
112:             * @exception SQLException on SQL errors
113:             * @exception JDOFatalDataStoreException if value is invalid
114:             */
115:            public void set(PreparedStatement ps, int index, JdbcColumn col,
116:                    int value) throws SQLException, JDOFatalDataStoreException {
117:                throw BindingSupportImpl.getInstance().internal(
118:                        "set(..int) called");
119:            }
120:
121:            /**
122:             * This method is called for converters that return true for
123:             * isOracleStyleLOB. The value at index in rs will contain the LOB to
124:             * be updated.
125:             * @exception SQLException on SQL errors
126:             * @exception JDOFatalDataStoreException if value is invalid
127:             */
128:            public void set(ResultSet rs, int index, JdbcColumn col,
129:                    Object value) throws SQLException,
130:                    JDOFatalDataStoreException {
131:
132:                VoaEdited.exception();
133:
134:                //        String s = (String)value;
135:                //        CLOB clob = (CLOB)rs.getClob(index);
136:                //        clob.putString(1, s);
137:
138:                // Calling trim leaks cursors - we make new CLOBs for every update to
139:                // avoid this problem
140:                // DO NOT DO - clob.trim(s.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 String.class;
149:            }
150:
151:        }
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