Prosty helper do ładowania danych

Czasami potrzebujemy w ramach testów na szybko wrzucić coś do bazy danych. Jeżeli korzystamy z DBUnit to mamy kilka opcji – XML, CSV, Excel… Jeżeli nie chcemy tworzyć plików zawsze możemy użyć DefaultDataSet i ręcznie wypełnić go danymi. Jest to wygodne rozwiązanie jeżeli mamy mało danych albo nie chcemy utrzymywać dodatkowych plików. minusem jest dość żmudna robota związana z tworzeniem kolejnych tabel i ich wypełnianiem. Dlatego też napisałem taki mały pseudo DSLowy helper usprawniający ten proces.

Listing 1. DBLoader

import java.io.File;
import java.io.FileInputStream;
import java.text.SimpleDateFormat;
import java.util.Date;

import org.dbunit.JdbcDatabaseTester;
import org.dbunit.database.AmbiguousTableNameException;
import org.dbunit.dataset.Column;
import org.dbunit.dataset.DataSetException;
import org.dbunit.dataset.DefaultDataSet;
import org.dbunit.dataset.DefaultTable;
import org.dbunit.dataset.IDataSet;
import org.dbunit.dataset.ITable;
import org.dbunit.dataset.datatype.DataType;
import org.dbunit.dataset.excel.XlsDataSet;
import org.dbunit.dataset.xml.FlatXmlDataSetBuilder;
import org.dbunit.dataset.xml.XmlDataSet;
import org.dbunit.operation.DatabaseOperation;

/**
 * Load data do db. Use DBUnit.
 * 
 * @author bartlomiejk
 * 
 */
public class DBLoader {

	/**
	 * DBUnit date format.
	 */
	private static final SimpleDateFormat DB_UNIT_DATE_FORMAT = new SimpleDateFormat("yyyy-MM-dd");

	/**
	 * DBUnit time format.
	 */
	private static final SimpleDateFormat DB_UNIT_TIME_FORMAT = new SimpleDateFormat("hh:mm:ss");

	/**
	 * DBUnit timestamp format.
	 */
	private static final SimpleDateFormat DB_UNIT_TIMESTAMP_FORMAT = new SimpleDateFormat(
			"yyyy-MM-dd hh:mm:ss.SSSSSSSSS");

	/**
	 * Simple tester.
	 */
	private JdbcDatabaseTester databaseTester;

	/**
	 * Create loader.
	 * 
	 * @param databaseTester
	 */
	private DBLoader(JdbcDatabaseTester databaseTester) {
		this.databaseTester = databaseTester;
	}

	/**
	 * Deete data than insert.
	 * 
	 * @param dataSet
	 *            data.
	 * @throws Exception
	 */
	public void cleanInsert(IDataSet dataSet) throws Exception {
		DatabaseOperation.CLEAN_INSERT.execute(databaseTester.getConnection(), dataSet);
	}

	/**
	 * Create columns names array.
	 * 
	 * @param names
	 * @return
	 */
	public static String[] cols(String... names) {
		return names;
	}

	/**
	 * Create {@link IDataSet} from {@link ITable}.
	 * 
	 * @param tables
	 * @return
	 * @throws AmbiguousTableNameException
	 */
	public static IDataSet dataSet(ITable... tables) throws AmbiguousTableNameException {
		return new DefaultDataSet(tables);
	}

	/**
	 * Create DBUnit-valid date {@link String} from {@link Date}.
	 * 
	 * @param date
	 * @return
	 */
	public static String date(Date date) {
		return DB_UNIT_DATE_FORMAT.format(date);
	}

	/**
	 * Create loader.
	 * 
	 * @param driverClassName
	 * @param url
	 * @param username
	 * @param password
	 * @return
	 * @throws ClassNotFoundException
	 */
	public static DBLoader forDB(String driverClassName, String url, String username, String password)
			throws ClassNotFoundException {
		return new DBLoader(new JdbcDatabaseTester(driverClassName, url, username, password));
	}

	/**
	 * Load from flat XML.
	 * 
	 * @param fileName
	 * @return
	 * @throws Exception
	 */
	public static IDataSet fromFlatXml(String fileName) throws Exception {
		return new FlatXmlDataSetBuilder().build(new File(fileName));
	}

	/**
	 * Load from XML with DTD.
	 * 
	 * @param fileName
	 * @return
	 * @throws Exception
	 */
	public static IDataSet fromXls(String fileName) throws Exception {
		return new XlsDataSet(new FileInputStream(new File(fileName)));
	}

	/**
	 * Load from xls.
	 * 
	 * @param fileName
	 * @return
	 * @throws Exception
	 */
	public static IDataSet fromXml(String fileName) throws Exception {
		return new XmlDataSet(new FileInputStream(new File(fileName)));
	}

	/**
	 * Map data to row.
	 * 
	 * @param rowData
	 * @return
	 */
	public static String[] row(String... rowData) {
		return rowData;
	}

	/**
	 * Create {@link ITable} with name, columns and data.
	 * 
	 * @param name
	 * @param cols
	 * @param rows
	 * @return
	 * @throws DataSetException
	 */
	public static ITable table(String name, String[] cols, String[]... rows) throws DataSetException {
		return addRows(defineTable(name, cols), rows);
	}

	/**
	 * Create DBUnit-valid time {@link String} from {@link Date}.
	 * 
	 * @param date
	 * @return
	 */
	public static String time(Date date) {
		return DB_UNIT_TIME_FORMAT.format(date);
	}

	/**
	 * Create DBUnit-valid timestamp {@link String} from {@link Date}.
	 * 
	 * @param date
	 * @return
	 */
	public static String timestamp(Date date) {
		return DB_UNIT_TIMESTAMP_FORMAT.format(date);
	}

	/**
	 * Add rows to tabel.
	 * 
	 * @param table
	 * @param rows
	 * @return
	 * @throws DataSetException
	 */
	private static ITable addRows(DefaultTable table, String[]... rows) throws DataSetException {
		for (String[] row : rows) {
			table.addRow(row);
		}
		return table;
	}

	/**
	 * Create table.
	 * 
	 * @param name
	 * @param cols
	 * @return
	 */
	private static DefaultTable defineTable(String name, String[] cols) {
		return new DefaultTable(name, makeColumns(cols));
	}

	/**
	 * Map columns names to {@link Column} array.
	 * 
	 * @param cols
	 * @return
	 */
	private static Column[] makeColumns(String[] cols) {
		Column[] columns = new Column[cols.length];
		for (int i = 0; i 
<p>I przykład użycia</p>
<p class="listing">Listing 2. Użycie - importy statyczne</p>java
	@BeforeClass
	protected void setUp() throws Exception {
		forDB("org.hsqldb.jdbcDriver", "jdbc:hsqldb:file:src/test/resources/db/unit-testing-jpa;shutdown=true",
				"sa", "").cleanInsert(dataSet(table("AIO", //
				cols("name", "pass","regtime"), //
				row("aaa", "aaa", date(new Date())), //
				row("bbb", "aaa", date(new Date())), //
				row("ccc", "aaa", date(new Date())) //
				)));
	}

<p>Przypominam, że DBUnit nie potrafi stworzyć struktury bazy danych. </p>
<p>// EDIT:</p>
<p>Dodałem metody odpowiedzialne za ładowanie z formatów XML, XML + DTD, XLS. </p>