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/**
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* SQL-DK
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* Copyright © 2013 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;
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import info.globalcode.sql.dk.batch.Batch;
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import info.globalcode.sql.dk.configuration.DatabaseDefinition;
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import info.globalcode.sql.dk.formatting.ColumnsHeader;
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import info.globalcode.sql.dk.formatting.Formatter;
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import java.sql.Connection;
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import java.sql.DriverManager;
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import java.sql.PreparedStatement;
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import java.sql.ResultSet;
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import java.sql.SQLException;
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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 DatabaseConnection {
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private DatabaseDefinition databaseDefinition;
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private Connection connection;
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public DatabaseConnection(DatabaseDefinition databaseDefinition) throws SQLException {
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this.databaseDefinition = databaseDefinition;
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connection = DriverManager.getConnection(databaseDefinition.getUrl(), databaseDefinition.getUserName(), databaseDefinition.getPassword());
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}
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public void executeQuery(SQLCommand sqlCommand, Formatter formatter) throws SQLException {
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formatter.writeStartDatabase(databaseDefinition);
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processCommand(sqlCommand, formatter);
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formatter.writeEndDatabase();
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}
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public void executeBatch(Batch batch, Formatter formatter) throws SQLException {
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formatter.writeStartDatabase(databaseDefinition);
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while (batch.hasNext()) {
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processCommand(batch.next(), formatter);
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}
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formatter.writeEndDatabase();
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}
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private void processCommand(SQLCommand sqlCommand, Formatter formatter) throws SQLException {
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SQLCommand.COMMAND_TYPE commandType = sqlCommand.getCommandType();
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switch (commandType) {
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case QUERY:
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processQueryCommand(sqlCommand, formatter);
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break;
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case UPDATE:
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processUpdateCommand(sqlCommand, formatter);
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break;
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default:
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throw new IllegalArgumentException("Unexpected command type: " + commandType);
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}
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}
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private void processQueryCommand(SQLCommand sqlCommand, Formatter formatter) throws SQLException {
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formatter.writeStartResultSet();
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formatter.writeQuery(sqlCommand.getQuery());
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formatter.writeParameters(sqlCommand.getParameters());
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try (PreparedStatement ps = sqlCommand.prepareStatement(connection)) {
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sqlCommand.parametrize(ps);
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try (ResultSet rs = ps.executeQuery()) {
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processResultSet(rs, formatter);
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}
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}
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formatter.writeEndResultSet();
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}
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private void processUpdateCommand(SQLCommand sqlCommand, Formatter formatter) throws SQLException {
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formatter.writeStartUpdatesResult();
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formatter.writeQuery(sqlCommand.getQuery());
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formatter.writeParameters(sqlCommand.getParameters());
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try (PreparedStatement ps = sqlCommand.prepareStatement(connection)) {
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sqlCommand.parametrize(ps);
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int updatedRowsCount = ps.executeUpdate();
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formatter.writeUpdatedRowsCount(updatedRowsCount);
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formatter.writeStartGeneratedKeys();
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try (ResultSet rs = ps.getGeneratedKeys()) {
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processResultSet(rs, formatter);
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}
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formatter.writeEndGeneratedKeys();
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}
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formatter.writeEndUpdatesResult();
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}
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private void processResultSet(ResultSet rs, Formatter formatter) throws SQLException {
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formatter.writeColumnsHeader(new ColumnsHeader(rs.getMetaData()));
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int columnCount = rs.getMetaData().getColumnCount();
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while (rs.next()) {
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formatter.writeStartRow();
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for (int i = 1; i <= columnCount; i++) {
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formatter.writeColumnValue(rs.getObject(i));
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}
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formatter.writeEndRow();
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}
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}
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}
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