diff -r 7e08730da258 -r 4a1864c3e867 java/sql-dk/src/main/java/info/globalcode/sql/dk/formatting/Formatter.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/java/sql-dk/src/main/java/info/globalcode/sql/dk/formatting/Formatter.java	Mon Mar 04 20:15:24 2019 +0100
@@ -0,0 +1,67 @@
+/**
+ * SQL-DK
+ * Copyright © 2013 František Kučera (frantovo.cz)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+package info.globalcode.sql.dk.formatting;
+
+import info.globalcode.sql.dk.Parameter;
+import info.globalcode.sql.dk.configuration.DatabaseDefinition;
+import java.util.List;
+
+/**
+ * The formatter is responsible for printing the result sets and/or updates result (count of
+ * inserted/updated rows). The formatter can produce output in arbitrary format – text, some markup
+ * or even binary data.
+ *
+ * @author Ing. František Kučera (frantovo.cz)
+ */
+public interface Formatter extends AutoCloseable {
+
+	void writeStartBatch();
+
+	void writeStartDatabase(DatabaseDefinition databaseDefinition);
+
+	void writeEndDatabase();
+
+	void writeStartStatement();
+
+	void writeEndStatement();
+
+	void writeQuery(String sql);
+
+	void writeParameters(List<? extends Parameter> parameters);
+
+	void writeStartResultSet(ColumnsHeader header);
+
+	void writeEndResultSet();
+
+	void writeStartRow();
+
+	void writeColumnValue(Object value);
+
+	void writeEndRow();
+
+	void writeUpdatesResult(int updatedRowsCount);
+
+	void writeEndBatch();
+
+	/**
+	 * If an error occurs (e.g. lost connection during result set reading) this method will be
+	 * called even if there was no {@linkplain #writeEndBach()}.
+	 */
+	@Override
+	void close() throws FormatterException;
+}