author | František Kučera <franta-hg@frantovo.cz> |
Wed, 08 Jan 2014 19:18:52 +0100 | |
branch | v_0 |
changeset 146 | 4f4f515df807 |
parent 145 | 5f90decd3b59 |
child 147 | 4a704c1669f4 |
permissions | -rw-r--r-- |
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/** |
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* SQL-DK |
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* Copyright © 2014 František Kučera (frantovo.cz) |
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* |
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* This program is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation, either version 3 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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package info.globalcode.sql.dk.batch; |
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|
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import info.globalcode.sql.dk.Parameter; |
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import info.globalcode.sql.dk.SQLCommand; |
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import info.globalcode.sql.dk.SQLCommandNamed; |
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import java.io.DataOutputStream; |
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import java.io.IOException; |
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import java.io.OutputStream; |
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import static info.globalcode.sql.dk.batch.BatchConstants.*; |
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import java.io.ByteArrayOutputStream; |
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import java.sql.SQLException; |
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import java.util.List; |
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/** |
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* |
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* @author Ing. František Kučera (frantovo.cz) |
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*/ |
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public class BatchEncoder { |
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public int encode(SQLCommand sqlCommand, OutputStream out) throws BatchException { |
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try { |
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ByteArrayOutputStream bufferAOS = new ByteArrayOutputStream(); |
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DataOutputStream buffer = new DataOutputStream(bufferAOS); |
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buffer.write(BATCH_HEADER); |
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if (sqlCommand instanceof SQLCommandNamed) { |
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sqlCommand = ((SQLCommandNamed) sqlCommand).getSQLCommandNumbered(); |
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} |
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byte[] sqlBytes = toBytes(sqlCommand.getQuery()); |
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buffer.writeInt(sqlBytes.length); |
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buffer.write(sqlBytes); |
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List<? extends Parameter> parameters = sqlCommand.getParameters(); |
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buffer.writeInt(parameters.size()); |
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for (Parameter p : parameters) { |
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buffer.writeInt(p.getType().getCode()); |
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byte[] value = toBytes((String) p.getValue()); // parameters are encoded before any preprocessing |
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buffer.writeInt(value.length); |
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buffer.write(value); |
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} |
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buffer.flush(); |
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bufferAOS.writeTo(out); |
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out.flush(); |
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return bufferAOS.size(); |
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} catch (IOException e) { |
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throw new BatchException("Unable to write SQL command: " + sqlCommand, e); |
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} catch (SQLException e) { |
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throw new BatchException("Unable to converd named SQL command to numbered: " + sqlCommand, e); |
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} |
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} |
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private static byte[] toBytes(String s) { |
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if (s == null) { |
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return new byte[]{}; |
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} else { |
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return s.getBytes(CHARSET); |
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} |
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} |
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} |