eu.databata.engine.util.PropagatorTableExport.java Source code

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Here is the source code for eu.databata.engine.util.PropagatorTableExport.java

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/**
 *   Copyright 2014 Nortal AS
 *
 *   Licensed 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.
 */
package eu.databata.engine.util;

import java.io.IOException;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Scanner;
import org.apache.commons.lang.StringUtils;
import org.hsqldb.cmdline.SqlExecutionCallback;
import org.hsqldb.cmdline.SqlFile;
import org.hsqldb.cmdline.SqlToolError;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.jdbc.core.JdbcTemplate;

/**
 * @author Maksim Boiko (max.boiko@gmail.com)
 */
public class PropagatorTableExport {

    public static void main(String[] args) {
        JdbcTemplate jdbcTemplate = initializeExport();
        String delimiter = askDelimiter();
        String tableNamePattern = askTableName();

        exportTablesData(jdbcTemplate, delimiter, tableNamePattern);

        System.out.println("Table export finished.");
    }

    private static void exportTablesData(JdbcTemplate jdbcTemplate, String delimiter, String tableNamePattern) {
        try {
            System.out.println("Trying to load tables from metadata");
            Connection connection = jdbcTemplate.getDataSource().getConnection();
            ResultSet tables = connection.getMetaData().getTables(null, null, tableNamePattern,
                    new String[] { "TABLE" });
            while (tables.next()) {
                System.out.println("Exporting data from " + tables.getString("TABLE_NAME"));
                exportData(jdbcTemplate, tables.getString("TABLE_NAME"), delimiter);
            }
        } catch (SQLException e) {
            System.out.println("\nError when trying to get table names from DB.");
        }
    }

    private static JdbcTemplate initializeExport() {
        ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext(
                "WEB-INF/propagator-db-beans.xml");
        JdbcTemplate jdbcTemplate = (JdbcTemplate) applicationContext.getBean("jdbcTemplate");
        System.out.println("\nDB table export utility is activated.");
        return jdbcTemplate;
    }

    private static void exportData(JdbcTemplate jdbcTemplate, String tableName, String delimiter) {
        String exportCommand = "* *DSV_COL_DELIM = " + delimiter + "\n\\x " + tableName + "\n";
        System.out.println("Exporting table using command:\n" + exportCommand);
        System.out.println("Result file with name '" + tableName
                + "'.dsv will be located inside current process execution folder.\n");
        Connection connection = null;
        try {
            SqlFile file = new SqlFile(exportCommand, null, tableName, new SqlExecutionCallback() {
                @Override
                public void handleExecuteSuccess(String sql, int i, double d) {
                    System.out.println("Sql execution success -> " + sql);
                }

                @Override
                public void handleException(SQLException sqlexception, String sql) throws SQLException {
                    System.out.println("Sql execution error -> " + sql);
                }
            }, null);

            connection = jdbcTemplate.getDataSource().getConnection();
            file.setConnection(connection);
            file.execute();
        } catch (IOException e) {
            System.out.println("Export finished with error\n" + e);
        } catch (SqlToolError e) {
            System.out.println("Export finished with error\n" + e);
        } catch (SQLException e) {
            System.out.println("Export finished with error\n" + e);
        } finally {
            try {
                connection.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }

    private static String askTableName() {
        System.out.println("Insert table name:");
        Scanner input = new Scanner(System.in);
        String name = input.nextLine();
        input.close();
        return name;
    }

    private static String askDelimiter() {
        System.out.println("Insert data delimiter [|]:");
        Scanner delimiterInput = new Scanner(System.in);
        String delimiter = delimiterInput.nextLine();
        if (StringUtils.isEmpty(delimiter)) {
            delimiter = "|";
        }
        delimiterInput.close();
        return delimiter;
    }
}