Java SQL Type readAscii(Clob clob, String defaultValue)

Description

read Ascii

License

Apache License

Declaration

private static String readAscii(Clob clob, String defaultValue) throws SQLException, IOException 

Method Source Code

//package com.java2s;
/*/*from  w  w w  .  j  a v  a 2 s  . c  om*/
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.lang.reflect.InvocationTargetException;

import java.sql.Clob;

import java.sql.SQLException;

public class Main {
    private static String readAscii(Clob clob, String defaultValue) throws SQLException, IOException {
        if (clob == null) {
            return defaultValue;
        }

        InputStream is = null;
        try {
            int length = (int) clob.length();
            if (length == 0) {
                return defaultValue;
            }

            byte[] buffer = new byte[length];
            is = clob.getAsciiStream();
            is.read(buffer);

            return new String(buffer, 0, length);
        } finally {
            try {
                if (is != null) {
                    is.close();
                }
            } catch (IOException e) {
                /* ignored */ }
            close(clob);
        }
    }

    private static String read(Clob clob, String defaultValue) throws SQLException, IOException {
        if (clob == null) {
            return defaultValue;
        }

        Reader r = null;
        try {
            int length = (int) clob.length();
            if (length == 0) {
                return defaultValue;
            }

            char[] buffer = new char[length];
            r = clob.getCharacterStream();
            r.read(buffer);

            return new String(buffer, 0, length);
        } finally {
            try {
                if (r != null) {
                    r.close();
                }
            } catch (IOException e) {
                /* ignored */ }
            close(clob);
        }
    }

    private static void close(Object lob) {
        if (lob == null) {
            return;
        }

        // ORACLE 'temporary lob' problem patch start
        Class clazz = lob.getClass();
        String name = clazz.getName();
        if (name.equals("oracle.sql.BLOB") || name.equals("oracle.sql.CLOB")) {
            try {
                if (clazz.getMethod("isTemporary", new Class[0]).invoke(lob, new Object[0]).equals(Boolean.TRUE)) {
                    clazz.getMethod("freeTemporary", new Class[0]).invoke(lob, new Object[0]);
                }
            } catch (IllegalAccessException e) {
                /* ignored */
            } catch (InvocationTargetException e) {
                /* ignored */
            } catch (NoSuchMethodException e) {
                /* ignored */
            }
        }
    }
}

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