/*
 * Copyright 2004-2014 H2 Group. Multiple-Licensed under the MPL 2.0,
 * and the EPL 1.0 (http://h2database.com/html/license.html).
 * Initial Developer: H2 Group
 */
package org.h2.test.db;

import org.h2.test.TestBase;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

/**
 * Test of compatibility for the SHOW statement.
 */
public class TestShow extends TestBase {

    /**
     * Run just this test.
     *
     * @param a ignored
     */
    public static void main(String... a) throws Exception {
        TestBase.createCaller().init().test();
    }

    @Override
    public void test() throws SQLException {
        testPgCompatibility();
        testMysqlCompatibility();
    }

    private void testPgCompatibility() throws SQLException {
        Connection conn = getConnection("mem:pg");
        Statement stat = conn.createStatement();

        assertResult("UNICODE", stat, "SHOW CLIENT_ENCODING");
        assertResult("read committed", stat, "SHOW DEFAULT_TRANSACTION_ISOLATION");
        assertResult("read committed", stat, "SHOW TRANSACTION ISOLATION LEVEL");
        assertResult("ISO", stat, "SHOW DATESTYLE");
        assertResult("8.1.4", stat, "SHOW SERVER_VERSION");
        assertResult("UTF8", stat, "SHOW SERVER_ENCODING");
    }

    private void testMysqlCompatibility() throws SQLException {
        Connection conn = getConnection("mem:pg");
        Statement stat = conn.createStatement();
        ResultSet rs;

        // show tables without a schema
        stat.execute("create table person(id int, name varchar)");
        rs = stat.executeQuery("SHOW TABLES");
        assertTrue(rs.next());
        assertEquals("PERSON", rs.getString(1));
        assertEquals("PUBLIC", rs.getString(2));
        assertFalse(rs.next());

        // show tables with a schema
        assertResultRowCount(1, stat.executeQuery("SHOW TABLES FROM PUBLIC"));

        // columns
        assertResultRowCount(2, stat.executeQuery("SHOW COLUMNS FROM person"));
    }
}
