/*
 * Copyright 2004-2011 H2 Group. Multiple-Licensed under the H2 License,
 * Version 1.0, and under the Eclipse Public License, Version 1.0
 * (http://h2database.com/html/license.html).
 * Initial Developer: H2 Group
 */
package org.h2.test.jdbc;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.StringReader;
import java.math.BigDecimal;
import java.sql.Connection;
import java.sql.Date;
import java.sql.ParameterMetaData;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;
import java.sql.Time;
import java.sql.Timestamp;
import java.sql.Types;
import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.SimpleTimeZone;
import java.util.TimeZone;
import java.util.UUID;
import org.h2.api.Trigger;
import org.h2.constant.ErrorCode;
import org.h2.test.TestBase;
import org.h2.util.DateTimeUtils;
import org.h2.util.Task;

/**
 * Tests for the PreparedStatement implementation.
 */
public class TestPreparedStatement extends TestBase {

    private static final int LOB_SIZE = 4000, LOB_SIZE_BIG = 512 * 1024;

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

    public void test() throws Exception {
        deleteDb("preparedStatement");
        Connection conn = getConnection("preparedStatement");
        testChangeType(conn);
        testDateTimeTimestampWithCalendar(conn);
        testCallTablePrepared(conn);
        testValues(conn);
        testToString(conn);
        testExecuteUpdateCall(conn);
        testPrepareExecute(conn);
        testUUID(conn);
        testScopedGeneratedKey(conn);
        testLobTempFiles(conn);
        testExecuteErrorTwice(conn);
        testTempView(conn);
        testInsertFunction(conn);
        testPrepareRecompile(conn);
        testMaxRowsChange(conn);
        testUnknownDataType(conn);
        testCancelReuse(conn);
        testCoalesce(conn);
        testPreparedStatementMetaData(conn);
        testDate(conn);
        testArray(conn);
        testUUIDGeneratedKeys(conn);
        testSetObject(conn);
        testPreparedSubquery(conn);
        testLikeIndex(conn);
        testCasewhen(conn);
        testSubquery(conn);
        testObject(conn);
        if (config.jdk14) {
            testIdentity(conn);
        }
        testDataTypes(conn);
        testGetMoreResults(conn);
        testBlob(conn);
        testClob(conn);
        testParameterMetaData(conn);
        conn.close();
        deleteDb("preparedStatement");
    }

    private static void testChangeType(Connection conn) throws SQLException {
        PreparedStatement prep = conn.prepareStatement("select (? || ? || ?) from dual");
        prep.setString(1, "a");
        prep.setString(2, "b");
        prep.setString(3, "c");
        prep.executeQuery();
        prep.setInt(1, 1);
        prep.setString(2, "ab");
        prep.setInt(3, 45);
        prep.executeQuery();
    }

    private void testDateTimeTimestampWithCalendar(Connection conn) throws SQLException {
        Statement stat = conn.createStatement();
        stat.execute("create table ts(x timestamp primary key)");
        stat.execute("create table t(x time primary key)");
        stat.execute("create table d(x date)");
        Calendar utcCalendar = new GregorianCalendar(new SimpleTimeZone(0, "Z"));
        TimeZone old = TimeZone.getDefault();
        DateTimeUtils.resetCalendar();
        TimeZone.setDefault(TimeZone.getTimeZone("PST"));
        try {
            Timestamp ts1 = Timestamp.valueOf("2010-03-13 18:15:00");
            Time t1 = new Time(ts1.getTime());
            Date d1 = new Date(ts1.getTime());
            // when converted to UTC, this is 03:15, which doesn't actually exist
            // because of summer time change at that day
            Timestamp ts2 = Timestamp.valueOf("2010-03-13 19:15:00");
            Time t2 = new Time(ts2.getTime());
            Date d2 = new Date(ts2.getTime());
            PreparedStatement prep;
            ResultSet rs;
            prep = conn.prepareStatement("insert into ts values(?)");
            prep.setTimestamp(1, ts1, utcCalendar);
            prep.execute();
            prep.setTimestamp(1, ts2, utcCalendar);
            prep.execute();
            prep = conn.prepareStatement("insert into t values(?)");
            prep.setTime(1, t1, utcCalendar);
            prep.execute();
            prep.setTime(1, t2, utcCalendar);
            prep.execute();
            prep = conn.prepareStatement("insert into d values(?)");
            prep.setDate(1, d1, utcCalendar);
            prep.execute();
            prep.setDate(1, d2, utcCalendar);
            prep.execute();
            rs = stat.executeQuery("select * from ts order by x");
            rs.next();
            assertEquals("2010-03-14 02:15:00.0", rs.getString(1));
            assertEquals("2010-03-13 18:15:00.0", rs.getTimestamp(1, utcCalendar).toString());
            assertEquals("2010-03-14 03:15:00.0", rs.getTimestamp(1).toString());
            assertEquals("2010-03-14 02:15:00.0", rs.getString("x"));
            assertEquals("2010-03-13 18:15:00.0", rs.getTimestamp("x", utcCalendar).toString());
            assertEquals("2010-03-14 03:15:00.0", rs.getTimestamp("x").toString());
            rs.next();
            assertEquals("2010-03-14 03:15:00.0", rs.getString(1));
            assertEquals("2010-03-13 19:15:00.0", rs.getTimestamp(1, utcCalendar).toString());
            assertEquals("2010-03-14 03:15:00.0", rs.getTimestamp(1).toString());
            assertEquals("2010-03-14 03:15:00.0", rs.getString("x"));
            assertEquals("2010-03-13 19:15:00.0", rs.getTimestamp("x", utcCalendar).toString());
            assertEquals("2010-03-14 03:15:00.0", rs.getTimestamp("x").toString());
            rs = stat.executeQuery("select * from t order by x");
            rs.next();
            assertEquals("02:15:00", rs.getString(1));
            assertEquals("18:15:00", rs.getTime(1, utcCalendar).toString());
            assertEquals("02:15:00", rs.getTime(1).toString());
            assertEquals("02:15:00", rs.getString("x"));
            assertEquals("18:15:00", rs.getTime("x", utcCalendar).toString());
            assertEquals("02:15:00", rs.getTime("x").toString());
            rs.next();
            assertEquals("03:15:00", rs.getString(1));
            assertEquals("19:15:00", rs.getTime(1, utcCalendar).toString());
            assertEquals("03:15:00", rs.getTime(1).toString());
            assertEquals("03:15:00", rs.getString("x"));
            assertEquals("19:15:00", rs.getTime("x", utcCalendar).toString());
            assertEquals("03:15:00", rs.getTime("x").toString());
            rs = stat.executeQuery("select * from d order by x");
            rs.next();
            assertEquals("2010-03-14", rs.getString(1));
            assertEquals("2010-03-13", rs.getDate(1, utcCalendar).toString());
            assertEquals("2010-03-14", rs.getDate(1).toString());
            assertEquals("2010-03-14", rs.getString("x"));
            assertEquals("2010-03-13", rs.getDate("x", utcCalendar).toString());
            assertEquals("2010-03-14", rs.getDate("x").toString());
            rs.next();
            assertEquals("2010-03-14", rs.getString(1));
            assertEquals("2010-03-13", rs.getDate(1, utcCalendar).toString());
            assertEquals("2010-03-14", rs.getDate(1).toString());
            assertEquals("2010-03-14", rs.getString("x"));
            assertEquals("2010-03-13", rs.getDate("x", utcCalendar).toString());
            assertEquals("2010-03-14", rs.getDate("x").toString());
        } finally {
            TimeZone.setDefault(old);
            DateTimeUtils.resetCalendar();
        }
        stat.execute("drop table ts");
        stat.execute("drop table t");
        stat.execute("drop table d");
    }

    private static void testCallTablePrepared(Connection conn) throws SQLException {
        PreparedStatement prep = conn.prepareStatement("call table(x int = (1))");
        prep.executeQuery();
        prep.executeQuery();
    }

    private void testValues(Connection conn) throws SQLException {
        PreparedStatement prep = conn.prepareStatement("values(?, ?)");
        prep.setInt(1, 1);
        prep.setString(2, "Hello");
        ResultSet rs = prep.executeQuery();
        rs.next();
        assertEquals(1, rs.getInt(1));
        assertEquals("Hello", rs.getString(2));

        prep = conn.prepareStatement("select * from values(?, ?), (2, 'World!')");
        prep.setInt(1, 1);
        prep.setString(2, "Hello");
        rs = prep.executeQuery();
        rs.next();
        assertEquals(1, rs.getInt(1));
        assertEquals("Hello", rs.getString(2));
        rs.next();
        assertEquals(2, rs.getInt(1));
        assertEquals("World!", rs.getString(2));

        prep = conn.prepareStatement("values 1, 2");
        rs = prep.executeQuery();
        rs.next();
        assertEquals(1, rs.getInt(1));
        rs.next();
        assertEquals(2, rs.getInt(1));
    }

    private void testToString(Connection conn) throws SQLException {
        PreparedStatement prep = conn.prepareStatement("call 1");
        assertTrue(prep.toString().endsWith(": call 1"));
        prep = conn.prepareStatement("call ?");
        assertTrue(prep.toString().endsWith(": call ?"));
        prep.setString(1, "Hello World");
        assertTrue(prep.toString().endsWith(": call ? {1: 'Hello World'}"));
    }

    private void testExecuteUpdateCall(Connection conn) throws SQLException {
        assertThrows(ErrorCode.DATA_CONVERSION_ERROR_1, conn.createStatement()).
                executeUpdate("CALL HASH('SHA256', STRINGTOUTF8('Password'), 1000)");
    }

    private void testPrepareExecute(Connection conn) throws SQLException {
        Statement stat = conn.createStatement();
        stat.execute("prepare test(int, int) as select ?1*?2");
        ResultSet rs = stat.executeQuery("execute test(3, 2)");
        rs.next();
        assertEquals(6, rs.getInt(1));
        stat.execute("deallocate test");
    }

    private void testLobTempFiles(Connection conn) throws SQLException {
        Statement stat = conn.createStatement();
        stat.execute("CREATE TABLE TEST(ID INT PRIMARY KEY, DATA CLOB)");
        PreparedStatement prep = conn.prepareStatement("INSERT INTO TEST VALUES(?, ?)");
        for (int i = 0; i < 5; i++) {
            prep.setInt(1, i);
            if (i % 2 == 0) {
                prep.setCharacterStream(2, new StringReader(getString(i)), -1);
            }
            prep.execute();
        }
        ResultSet rs = stat.executeQuery("SELECT * FROM TEST ORDER BY ID");
        int check = 0;
        for (int i = 0; i < 5; i++) {
            assertTrue(rs.next());
            if (i % 2 == 0) {
                check = i;
            }
            assertEquals(getString(check), rs.getString(2));
        }
        assertFalse(rs.next());
        stat.execute("DELETE FROM TEST");
        for (int i = 0; i < 3; i++) {
            prep.setInt(1, i);
            prep.setCharacterStream(2, new StringReader(getString(i)), -1);
            prep.addBatch();
        }
        prep.executeBatch();
        rs = stat.executeQuery("SELECT * FROM TEST ORDER BY ID");
        for (int i = 0; i < 3; i++) {
            assertTrue(rs.next());
            assertEquals(getString(i), rs.getString(2));
        }
        assertFalse(rs.next());
        stat.execute("DROP TABLE TEST");
    }

    private static String getString(int i) {
        return new String(new char[100000]).replace('\0', (char) ('0' + i));
    }

    private void testExecuteErrorTwice(Connection conn) throws SQLException {
        PreparedStatement prep = conn.prepareStatement("CREATE TABLE BAD AS SELECT A");
        assertThrows(ErrorCode.COLUMN_NOT_FOUND_1, prep).execute();
        assertThrows(ErrorCode.COLUMN_NOT_FOUND_1, prep).execute();
    }

    private void testTempView(Connection conn) throws SQLException {
        Statement stat = conn.createStatement();
        PreparedStatement prep;
        stat.execute("CREATE TABLE TEST(FIELD INT PRIMARY KEY)");
        stat.execute("INSERT INTO TEST VALUES(1)");
        stat.execute("INSERT INTO TEST VALUES(2)");
        prep = conn.prepareStatement("select FIELD FROM "
                + "(select FIELD FROM (SELECT FIELD  FROM TEST WHERE FIELD = ?) AS T2 "
                + "WHERE T2.FIELD = ?) AS T3 WHERE T3.FIELD = ?");
        prep.setInt(1, 1);
        prep.setInt(2, 1);
        prep.setInt(3, 1);
        ResultSet rs = prep.executeQuery();
        rs.next();
        assertEquals(1, rs.getInt(1));
        prep.setInt(1, 2);
        prep.setInt(2, 2);
        prep.setInt(3, 2);
        rs = prep.executeQuery();
        rs.next();
        assertEquals(2, rs.getInt(1));
        stat.execute("DROP TABLE TEST");
    }

    private void testInsertFunction(Connection conn) throws SQLException {
        Statement stat = conn.createStatement();
        PreparedStatement prep;
        ResultSet rs;

        stat.execute("CREATE TABLE TEST(ID INT, H BINARY)");
        prep = conn.prepareStatement("INSERT INTO TEST VALUES(?, HASH('SHA256', STRINGTOUTF8(?), 5))");
        prep.setInt(1, 1);
        prep.setString(2, "One");
        prep.execute();
        prep.setInt(1, 2);
        prep.setString(2, "Two");
        prep.execute();
        rs = stat.executeQuery("SELECT COUNT(DISTINCT H) FROM TEST");
        rs.next();
        assertEquals(2, rs.getInt(1));

        stat.execute("DROP TABLE TEST");
    }

    private void testPrepareRecompile(Connection conn) throws SQLException {
        Statement stat = conn.createStatement();
        PreparedStatement prep;
        ResultSet rs;

        prep = conn.prepareStatement("SELECT COUNT(*) FROM DUAL WHERE ? IS NULL");
        prep.setString(1, null);
        prep.executeQuery();
        stat.execute("CREATE TABLE TEST(ID INT)");
        stat.execute("DROP TABLE TEST");
        prep.setString(1, null);
        prep.executeQuery();
        prep.setString(1, "X");
        rs = prep.executeQuery();
        rs.next();
        assertEquals(0, rs.getInt(1));

        stat.execute("CREATE TABLE t1 (c1 INT, c2 VARCHAR(10))");
        stat.execute("INSERT INTO t1 SELECT X, CONCAT('Test', X)  FROM SYSTEM_RANGE(1, 5);");
        prep = conn.prepareStatement("SELECT c1, c2 FROM t1 WHERE c1 = ?");
        prep.setInt(1, 1);
        prep.executeQuery();
        stat.execute("CREATE TABLE t2 (x int PRIMARY KEY)");
        prep.setInt(1, 2);
        rs = prep.executeQuery();
        rs.next();
        assertEquals(2, rs.getInt(1));
        prep.setInt(1, 3);
        rs = prep.executeQuery();
        rs.next();
        assertEquals(3, rs.getInt(1));
        stat.execute("DROP TABLE t1, t2");

    }

    private void testMaxRowsChange(Connection conn) throws SQLException {
        PreparedStatement prep = conn.prepareStatement("SELECT * FROM SYSTEM_RANGE(1, 100)");
        ResultSet rs;
        for (int j = 1; j < 20; j++) {
            prep.setMaxRows(j);
            rs = prep.executeQuery();
            for (int i = 0; i < j; i++) {
                assertTrue(rs.next());
            }
            assertFalse(rs.next());
        }
    }

    private void testUnknownDataType(Connection conn) throws SQLException {
        assertThrows(ErrorCode.UNKNOWN_DATA_TYPE_1, conn).
            prepareStatement("SELECT * FROM (SELECT ? FROM DUAL)");
        PreparedStatement prep = conn.prepareStatement("SELECT -?");
        prep.setInt(1, 1);
        prep.execute();
        prep = conn.prepareStatement("SELECT ?-?");
        prep.setInt(1, 1);
        prep.setInt(2, 2);
        prep.execute();
    }

    private void testCancelReuse(Connection conn) throws Exception {
        conn.createStatement().execute("CREATE ALIAS SLEEP FOR \"java.lang.Thread.sleep\"");
        // sleep for 10 seconds
        final PreparedStatement prep = conn.prepareStatement("SELECT SLEEP(?) FROM SYSTEM_RANGE(1, 10000) LIMIT ?");
        prep.setInt(1, 1);
        prep.setInt(2, 10000);
        Task t = new Task() {
            public void call() throws SQLException {
                prep.execute();
            }
        };
        t.execute();
        Thread.sleep(100);
        prep.cancel();
        SQLException e = (SQLException) t.getException();
        assertTrue(e != null);
        assertEquals(ErrorCode.STATEMENT_WAS_CANCELED, e.getErrorCode());
        prep.setInt(1, 1);
        prep.setInt(2, 1);
        ResultSet rs = prep.executeQuery();
        assertTrue(rs.next());
        assertEquals(0, rs.getInt(1));
        assertFalse(rs.next());
    }

    private static void testCoalesce(Connection conn) throws SQLException {
        Statement stat = conn.createStatement();
        stat.executeUpdate("create table test(tm timestamp)");
        stat.executeUpdate("insert into test values(current_timestamp)");
        PreparedStatement prep = conn.prepareStatement("update test set tm = coalesce(?,tm)");
        prep.setTimestamp(1, new java.sql.Timestamp(System.currentTimeMillis()));
        prep.executeUpdate();
        stat.executeUpdate("drop table test");
    }

    private void testPreparedStatementMetaData(Connection conn) throws SQLException {
        PreparedStatement prep = conn.prepareStatement("select * from table(x int = ?, name varchar = ?)");
        ResultSetMetaData meta = prep.getMetaData();
        assertEquals(2, meta.getColumnCount());
        assertEquals("INTEGER", meta.getColumnTypeName(1));
        assertEquals("VARCHAR", meta.getColumnTypeName(2));
        prep = conn.prepareStatement("call 1");
        meta = prep.getMetaData();
        assertEquals(1, meta.getColumnCount());
        assertEquals("INTEGER", meta.getColumnTypeName(1));
    }

    private void testArray(Connection conn) throws SQLException {
        PreparedStatement prep = conn.prepareStatement("select * from table(x int = ?) order by x");
        prep.setObject(1, new Object[] { new BigDecimal("1"), "2" });
        ResultSet rs = prep.executeQuery();
        rs.next();
        assertEquals("1", rs.getString(1));
        rs.next();
        assertEquals("2", rs.getString(1));
        assertFalse(rs.next());
    }

    private void testUUID(Connection conn) throws SQLException {
        Statement stat = conn.createStatement();
        stat.execute("create table test_uuid(id uuid primary key)");
        UUID uuid = new UUID(-2, -1);
        PreparedStatement prep = conn.prepareStatement("insert into test_uuid values(?)");
        prep.setObject(1, uuid);
        prep.execute();
        ResultSet rs = stat.executeQuery("select * from test_uuid");
        rs.next();
        assertEquals("ffffffff-ffff-fffe-ffff-ffffffffffff", rs.getString(1));
        Object o = rs.getObject(1);
        assertEquals("java.util.UUID", o.getClass().getName());
        stat.execute("drop table test_uuid");
    }

    private void testUUIDGeneratedKeys(Connection conn) throws SQLException {
        Statement stat = conn.createStatement();
        stat.execute("CREATE TABLE TEST_UUID(id UUID DEFAULT random_UUID() PRIMARY KEY)");
        stat.execute("INSERT INTO TEST_UUID() VALUES()");
        ResultSet rs = stat.getGeneratedKeys();
        rs.next();
        byte[] data = rs.getBytes(1);
        assertEquals(16, data.length);
        stat.execute("INSERT INTO TEST_UUID VALUES(random_UUID())");
        rs = stat.getGeneratedKeys();
        assertFalse(rs.next());
        stat.execute("DROP TABLE TEST_UUID");
    }

    /**
     * A trigger that creates a sequence value.
     */
    public static class SequenceTrigger implements Trigger {

        public void fire(Connection conn, Object[] oldRow, Object[] newRow) throws SQLException {
            conn.setAutoCommit(false);
            conn.createStatement().execute("call next value for seq");
        }

        public void init(Connection conn, String schemaName, String triggerName, String tableName, boolean before,
                int type) {
            // ignore
        }

        public void close() {
            // ignore
        }

        public void remove() {
            // ignore
        }

    }

    private void testScopedGeneratedKey(Connection conn) throws SQLException {
        Statement stat = conn.createStatement();
        Trigger t = new SequenceTrigger();
        stat.execute("create table test(id identity)");
        stat.execute("create sequence seq start with 1000");
        stat.execute("create trigger test_ins after insert on test call \"" + t.getClass().getName() + "\"");
        stat.execute("insert into test values(null)");
        ResultSet rs = stat.getGeneratedKeys();
        rs.next();
        assertEquals(1, rs.getLong(1));
        stat.execute("insert into test values(100)");
        rs = stat.getGeneratedKeys();
        rs.next();
        assertEquals(100, rs.getLong(1));
        stat.execute("drop sequence seq");
        stat.execute("drop table test");
    }

    private void testSetObject(Connection conn) throws SQLException {
        Statement stat = conn.createStatement();
        stat.execute("CREATE TABLE TEST(C CHAR(1))");
        PreparedStatement prep = conn.prepareStatement("INSERT INTO TEST VALUES(?)");
        prep.setObject(1, 'x');
        prep.execute();
        stat.execute("DROP TABLE TEST");
        stat.execute("CREATE TABLE TEST(ID INT, DATA BINARY, JAVA OTHER)");
        prep = conn.prepareStatement("INSERT INTO TEST VALUES(?, ?, ?)");
        prep.setInt(1, 1);
        prep.setObject(2, 11);
        prep.setObject(3, null);
        prep.execute();
        prep.setInt(1, 2);
        prep.setObject(2, 101, Types.OTHER);
        prep.setObject(3, 103, Types.OTHER);
        prep.execute();
        PreparedStatement p2 = conn.prepareStatement("SELECT * FROM TEST ORDER BY ID");
        ResultSet rs = p2.executeQuery();
        rs.next();
        Object o = rs.getObject(2);
        assertTrue(o instanceof byte[]);
        assertTrue(rs.getObject(3) == null);
        rs.next();
        o = rs.getObject(2);
        assertTrue(o instanceof byte[]);
        o = rs.getObject(3);
        assertTrue(o instanceof Integer);
        assertEquals(103, ((Integer) o).intValue());
        assertFalse(rs.next());
        stat.execute("DROP TABLE TEST");
    }

    private void testDate(Connection conn) throws SQLException {
        PreparedStatement prep = conn.prepareStatement("SELECT ?");
        Timestamp ts = Timestamp.valueOf("2001-02-03 04:05:06");
        prep.setObject(1, new java.util.Date(ts.getTime()));
        ResultSet rs = prep.executeQuery();
        rs.next();
        Timestamp ts2 = rs.getTimestamp(1);
        assertEquals(ts.toString(), ts2.toString());
    }

    private void testPreparedSubquery(Connection conn) throws SQLException {
        Statement s = conn.createStatement();
        s.executeUpdate("CREATE TABLE TEST(ID IDENTITY, FLAG BIT)");
        s.executeUpdate("INSERT INTO TEST(ID, FLAG) VALUES(0, FALSE)");
        s.executeUpdate("INSERT INTO TEST(ID, FLAG) VALUES(1, FALSE)");
        PreparedStatement u = conn.prepareStatement("SELECT ID, FLAG FROM TEST ORDER BY ID");
        PreparedStatement p = conn.prepareStatement("UPDATE TEST SET FLAG=true WHERE ID=(SELECT ?)");
        p.clearParameters();
        p.setLong(1, 0);
        assertEquals(1, p.executeUpdate());
        p.clearParameters();
        p.setLong(1, 1);
        assertEquals(1, p.executeUpdate());
        ResultSet rs = u.executeQuery();
        assertTrue(rs.next());
        assertEquals(0, rs.getInt(1));
        assertTrue(rs.getBoolean(2));
        assertTrue(rs.next());
        assertEquals(1, rs.getInt(1));
        assertTrue(rs.getBoolean(2));

        p = conn.prepareStatement("SELECT * FROM TEST WHERE EXISTS(SELECT * FROM TEST WHERE ID=?)");
        p.setInt(1, -1);
        rs = p.executeQuery();
        assertFalse(rs.next());
        p.setInt(1, 1);
        rs = p.executeQuery();
        assertTrue(rs.next());

        s.executeUpdate("DROP TABLE IF EXISTS TEST");
    }

    private void testParameterMetaData(Connection conn) throws SQLException {
        PreparedStatement prep = conn.prepareStatement("SELECT ?, ?, ? FROM DUAL");
        ParameterMetaData pm = prep.getParameterMetaData();
        assertEquals("java.lang.String", pm.getParameterClassName(1));
        assertEquals("VARCHAR", pm.getParameterTypeName(1));
        assertEquals(3, pm.getParameterCount());
        assertEquals(ParameterMetaData.parameterModeIn, pm.getParameterMode(1));
        assertEquals(Types.VARCHAR, pm.getParameterType(1));
        assertEquals(0, pm.getPrecision(1));
        assertEquals(0, pm.getScale(1));
        assertEquals(ResultSetMetaData.columnNullableUnknown, pm.isNullable(1));
        assertEquals(pm.isSigned(1), true);
        assertThrows(ErrorCode.INVALID_VALUE_2, pm).getPrecision(0);
        assertThrows(ErrorCode.INVALID_VALUE_2, pm).getPrecision(4);
        prep.close();
        assertThrows(ErrorCode.OBJECT_CLOSED, pm).getPrecision(1);

        Statement stat = conn.createStatement();
        stat.execute("CREATE TABLE TEST3(ID INT, NAME VARCHAR(255), DATA DECIMAL(10,2))");
        PreparedStatement prep1 = conn.prepareStatement("UPDATE TEST3 SET ID=?, NAME=?, DATA=?");
        PreparedStatement prep2 = conn.prepareStatement("INSERT INTO TEST3 VALUES(?, ?, ?)");
        checkParameter(prep1, 1, "java.lang.Integer", 4, "INTEGER", 10, 0);
        checkParameter(prep1, 2, "java.lang.String", 12, "VARCHAR", 255, 0);
        checkParameter(prep1, 3, "java.math.BigDecimal", 3, "DECIMAL", 10, 2);
        checkParameter(prep2, 1, "java.lang.Integer", 4, "INTEGER", 10, 0);
        checkParameter(prep2, 2, "java.lang.String", 12, "VARCHAR", 255, 0);
        checkParameter(prep2, 3, "java.math.BigDecimal", 3, "DECIMAL", 10, 2);
        PreparedStatement prep3 = conn.prepareStatement("SELECT * FROM TEST3 WHERE ID=? AND NAME LIKE ? AND ?>DATA");
        checkParameter(prep3, 1, "java.lang.Integer", 4, "INTEGER", 10, 0);
        checkParameter(prep3, 2, "java.lang.String", 12, "VARCHAR", 0, 0);
        checkParameter(prep3, 3, "java.math.BigDecimal", 3, "DECIMAL", 10, 2);
        stat.execute("DROP TABLE TEST3");
    }

    private void checkParameter(PreparedStatement prep, int index,
            String className, int type, String typeName, int precision, int scale) throws SQLException {
        ParameterMetaData meta = prep.getParameterMetaData();
        assertEquals(className, meta.getParameterClassName(index));
        assertEquals(type, meta.getParameterType(index));
        assertEquals(typeName, meta.getParameterTypeName(index));
        assertEquals(precision, meta.getPrecision(index));
        assertEquals(scale, meta.getScale(index));
    }

    private void testLikeIndex(Connection conn) throws SQLException {
        Statement stat = conn.createStatement();
        stat.execute("CREATE TABLE TEST(ID INT PRIMARY KEY, NAME VARCHAR(255))");
        stat.execute("INSERT INTO TEST VALUES(1, 'Hello')");
        stat.execute("INSERT INTO TEST VALUES(2, 'World')");
        stat.execute("create index idxname on test(name);");
        PreparedStatement prep, prepExe;

        prep = conn.prepareStatement("EXPLAIN SELECT * FROM TEST WHERE NAME LIKE ?");
        assertEquals(1, prep.getParameterMetaData().getParameterCount());
        prepExe = conn.prepareStatement("SELECT * FROM TEST WHERE NAME LIKE ?");
        prep.setString(1, "%orld");
        prepExe.setString(1, "%orld");
        ResultSet rs = prep.executeQuery();
        rs.next();
        String plan = rs.getString(1);
        assertTrue(plan.indexOf(".tableScan") >= 0);
        rs = prepExe.executeQuery();
        rs.next();
        assertEquals("World", rs.getString(2));
        assertFalse(rs.next());

        prep.setString(1, "H%");
        prepExe.setString(1, "H%");
        rs = prep.executeQuery();
        rs.next();
        String plan1 = rs.getString(1);
        assertTrue(plan1.indexOf("IDXNAME") >= 0);
        rs = prepExe.executeQuery();
        rs.next();
        assertEquals("Hello", rs.getString(2));
        assertFalse(rs.next());

        stat.execute("DROP TABLE IF EXISTS TEST");
    }

    private void testCasewhen(Connection conn) throws SQLException {
        Statement stat = conn.createStatement();
        stat.execute("CREATE TABLE TEST(ID INT)");
        stat.execute("INSERT INTO TEST VALUES(1),(2),(3)");
        PreparedStatement prep;
        ResultSet rs;
        prep = conn.prepareStatement("EXPLAIN SELECT COUNT(*) FROM TEST " +
                "WHERE CASEWHEN(ID=1, ID, ID)=? GROUP BY ID");
        prep.setInt(1, 1);
        rs = prep.executeQuery();
        rs.next();
        String plan = rs.getString(1);
        trace(plan);
        rs.close();
        prep = conn
                .prepareStatement("EXPLAIN SELECT COUNT(*) FROM TEST " +
                        "WHERE CASE ID WHEN 1 THEN ID WHEN 2 THEN ID ELSE ID END=? GROUP BY ID");
        prep.setInt(1, 1);
        rs = prep.executeQuery();
        rs.next();
        plan = rs.getString(1);
        trace(plan);

        prep = conn.prepareStatement("SELECT COUNT(*) FROM TEST WHERE CASEWHEN(ID=1, ID, ID)=? GROUP BY ID");
        prep.setInt(1, 1);
        rs = prep.executeQuery();
        assertTrue(rs.next());
        assertEquals(1, rs.getInt(1));
        assertFalse(rs.next());

        prep = conn
                .prepareStatement("SELECT COUNT(*) FROM TEST WHERE CASE ID WHEN 1 THEN ID WHEN 2 THEN ID ELSE ID END=? GROUP BY ID");
        prep.setInt(1, 1);
        rs = prep.executeQuery();
        assertTrue(rs.next());
        assertEquals(1, rs.getInt(1));
        assertFalse(rs.next());

        prep = conn.prepareStatement("SELECT * FROM TEST WHERE ? IS NULL");
        prep.setString(1, "Hello");
        rs = prep.executeQuery();
        assertFalse(rs.next());
        assertThrows(ErrorCode.UNKNOWN_DATA_TYPE_1, conn).
                prepareStatement("select ? from dual union select ? from dual");
        prep = conn.prepareStatement("select cast(? as varchar) from dual union select ? from dual");
        assertEquals(2, prep.getParameterMetaData().getParameterCount());
        prep.setString(1, "a");
        prep.setString(2, "a");
        rs = prep.executeQuery();
        rs.next();
        assertEquals("a", rs.getString(1));
        assertEquals("a", rs.getString(1));
        assertFalse(rs.next());

        stat.execute("DROP TABLE TEST");
    }

    private void testSubquery(Connection conn) throws SQLException {
        Statement stat = conn.createStatement();
        stat.execute("CREATE TABLE TEST(ID INT)");
        stat.execute("INSERT INTO TEST VALUES(1),(2),(3)");
        PreparedStatement prep = conn.prepareStatement("select x.id, ? from "
                + "(select * from test where id in(?, ?)) x where x.id*2 <>  ?");
        assertEquals(4, prep.getParameterMetaData().getParameterCount());
        prep.setInt(1, 0);
        prep.setInt(2, 1);
        prep.setInt(3, 2);
        prep.setInt(4, 4);
        ResultSet rs = prep.executeQuery();
        rs.next();
        assertEquals(1, rs.getInt(1));
        assertEquals(0, rs.getInt(2));
        assertFalse(rs.next());
        stat.execute("DROP TABLE TEST");
    }

    private void testDataTypes(Connection conn) throws SQLException {
        conn.createStatement(ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY);
        conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE);
        Statement stat = conn.createStatement();
        PreparedStatement prep;
        ResultSet rs;
        trace("Create tables");
        stat.execute("CREATE TABLE T_INT(ID INT PRIMARY KEY,VALUE INT)");
        stat.execute("CREATE TABLE T_VARCHAR(ID INT PRIMARY KEY,VALUE VARCHAR(255))");
        stat.execute("CREATE TABLE T_DECIMAL_0(ID INT PRIMARY KEY,VALUE DECIMAL(30,0))");
        stat.execute("CREATE TABLE T_DECIMAL_10(ID INT PRIMARY KEY,VALUE DECIMAL(20,10))");
        stat.execute("CREATE TABLE T_DATETIME(ID INT PRIMARY KEY,VALUE DATETIME)");
        prep = conn.prepareStatement("INSERT INTO T_INT VALUES(?,?)", ResultSet.TYPE_FORWARD_ONLY,
                ResultSet.CONCUR_READ_ONLY);
        prep.setInt(1, 1);
        prep.setInt(2, 0);
        prep.executeUpdate();
        prep.setInt(1, 2);
        prep.setInt(2, -1);
        prep.executeUpdate();
        prep.setInt(1, 3);
        prep.setInt(2, 3);
        prep.executeUpdate();
        prep.setInt(1, 4);
        prep.setNull(2, Types.INTEGER);
        prep.executeUpdate();
        prep.setInt(1, 5);
        prep.setBigDecimal(2, new java.math.BigDecimal("0"));
        prep.executeUpdate();
        prep.setInt(1, 6);
        prep.setString(2, "-1");
        prep.executeUpdate();
        prep.setInt(1, 7);
        prep.setObject(2, new Integer(3));
        prep.executeUpdate();
        prep.setObject(1, "8");
        // should throw an exception
        prep.setObject(2, null);
        // some databases don't allow calling setObject with null (no data type)
        prep.executeUpdate();
        prep.setInt(1, 9);
        prep.setObject(2, -4, Types.VARCHAR);
        prep.executeUpdate();
        prep.setInt(1, 10);
        prep.setObject(2, "5", Types.INTEGER);
        prep.executeUpdate();
        prep.setInt(1, 11);
        prep.setObject(2, null, Types.INTEGER);
        prep.executeUpdate();
        prep.setInt(1, 12);
        prep.setBoolean(2, true);
        prep.executeUpdate();
        prep.setInt(1, 13);
        prep.setBoolean(2, false);
        prep.executeUpdate();
        prep.setInt(1, 14);
        prep.setByte(2, (byte) -20);
        prep.executeUpdate();
        prep.setInt(1, 15);
        prep.setByte(2, (byte) 100);
        prep.executeUpdate();
        prep.setInt(1, 16);
        prep.setShort(2, (short) 30000);
        prep.executeUpdate();
        prep.setInt(1, 17);
        prep.setShort(2, (short) (-30000));
        prep.executeUpdate();
        prep.setInt(1, 18);
        prep.setLong(2, Integer.MAX_VALUE);
        prep.executeUpdate();
        prep.setInt(1, 19);
        prep.setLong(2, Integer.MIN_VALUE);
        prep.executeUpdate();

        assertTrue(stat.execute("SELECT * FROM T_INT ORDER BY ID"));
        rs = stat.getResultSet();
        assertResultSetOrdered(rs, new String[][] { { "1", "0" }, { "2", "-1" }, { "3", "3" }, { "4", null },
                { "5", "0" }, { "6", "-1" }, { "7", "3" }, { "8", null }, { "9", "-4" }, { "10", "5" }, { "11", null },
                { "12", "1" }, { "13", "0" }, { "14", "-20" }, { "15", "100" }, { "16", "30000" }, { "17", "-30000" },
                { "18", "" + Integer.MAX_VALUE }, { "19", "" + Integer.MIN_VALUE }, });

        prep = conn.prepareStatement("INSERT INTO T_DECIMAL_0 VALUES(?,?)");
        prep.setInt(1, 1);
        prep.setLong(2, Long.MAX_VALUE);
        prep.executeUpdate();
        prep.setInt(1, 2);
        prep.setLong(2, Long.MIN_VALUE);
        prep.executeUpdate();
        prep.setInt(1, 3);
        prep.setFloat(2, 10);
        prep.executeUpdate();
        prep.setInt(1, 4);
        prep.setFloat(2, -20);
        prep.executeUpdate();
        prep.setInt(1, 5);
        prep.setFloat(2, 30);
        prep.executeUpdate();
        prep.setInt(1, 6);
        prep.setFloat(2, -40);
        prep.executeUpdate();

        rs = stat.executeQuery("SELECT VALUE FROM T_DECIMAL_0 ORDER BY ID");
        checkBigDecimal(rs, new String[] { "" + Long.MAX_VALUE, "" + Long.MIN_VALUE, "10", "-20", "30", "-40" });
    }

    private void testGetMoreResults(Connection conn) throws SQLException {
        Statement stat = conn.createStatement();
        PreparedStatement prep;
        ResultSet rs;
        stat.execute("CREATE TABLE TEST(ID INT)");
        stat.execute("INSERT INTO TEST VALUES(1)");

        prep = conn.prepareStatement("SELECT * FROM TEST");
        // just to check if it doesn't throw an exception - it may be null
        prep.getMetaData();
        assertTrue(prep.execute());
        rs = prep.getResultSet();
        assertFalse(prep.getMoreResults());
        assertEquals(-1, prep.getUpdateCount());
        // supposed to be closed now
        assertThrows(ErrorCode.OBJECT_CLOSED, rs).next();
        assertEquals(-1, prep.getUpdateCount());

        prep = conn.prepareStatement("UPDATE TEST SET ID = 2");
        assertFalse(prep.execute());
        assertEquals(1, prep.getUpdateCount());
        assertFalse(prep.getMoreResults(Statement.CLOSE_CURRENT_RESULT));
        assertEquals(-1, prep.getUpdateCount());
        // supposed to be closed now
        assertThrows(ErrorCode.OBJECT_CLOSED, rs).next();
        assertEquals(-1, prep.getUpdateCount());

        prep = conn.prepareStatement("DELETE FROM TEST");
        prep.executeUpdate();
        assertFalse(prep.getMoreResults());
        assertEquals(-1, prep.getUpdateCount());
    }

    private void testObject(Connection conn) throws SQLException {
        Statement stat = conn.createStatement();
        ResultSet rs;
        stat.execute("CREATE TABLE TEST(ID INT PRIMARY KEY, NAME VARCHAR(255))");
        stat.execute("INSERT INTO TEST VALUES(1, 'Hello')");
        PreparedStatement prep = conn
                .prepareStatement("SELECT ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ? FROM TEST");
        prep.setObject(1, new Boolean(true));
        prep.setObject(2, "Abc");
        prep.setObject(3, new BigDecimal("10.2"));
        prep.setObject(4, new Byte((byte) 0xff));
        prep.setObject(5, new Short(Short.MAX_VALUE));
        prep.setObject(6, new Integer(Integer.MIN_VALUE));
        prep.setObject(7, new Long(Long.MAX_VALUE));
        prep.setObject(8, new Float(Float.MAX_VALUE));
        prep.setObject(9, new Double(Double.MAX_VALUE));
        prep.setObject(10, java.sql.Date.valueOf("2001-02-03"));
        prep.setObject(11, java.sql.Time.valueOf("04:05:06"));
        prep.setObject(12, java.sql.Timestamp.valueOf("2001-02-03 04:05:06.123456789"));
        prep.setObject(13, new java.util.Date(java.sql.Date.valueOf("2001-02-03").getTime()));
        prep.setObject(14, new byte[] { 10, 20, 30 });
        prep.setObject(15, new Character('a'), Types.OTHER);
        prep.setObject(16, "2001-01-02", Types.DATE);
        // converting to null seems strange...
        prep.setObject(17, "2001-01-02", Types.NULL);
        prep.setObject(18, "3.725", Types.DOUBLE);
        prep.setObject(19, "23:22:21", Types.TIME);
        prep.setObject(20, new java.math.BigInteger("12345"), Types.OTHER);
        rs = prep.executeQuery();
        rs.next();
        assertTrue(rs.getObject(1).equals(new Boolean(true)));
        assertTrue(rs.getObject(2).equals("Abc"));
        assertTrue(rs.getObject(3).equals(new BigDecimal("10.2")));
        assertTrue(rs.getObject(4).equals((byte) 0xff));
        assertTrue(rs.getObject(5).equals(new Short(Short.MAX_VALUE)));
        assertTrue(rs.getObject(6).equals(new Integer(Integer.MIN_VALUE)));
        assertTrue(rs.getObject(7).equals(new Long(Long.MAX_VALUE)));
        assertTrue(rs.getObject(8).equals(new Float(Float.MAX_VALUE)));
        assertTrue(rs.getObject(9).equals(new Double(Double.MAX_VALUE)));
        assertTrue(rs.getObject(10).equals(java.sql.Date.valueOf("2001-02-03")));
        assertEquals("04:05:06", rs.getObject(11).toString());
        assertTrue(rs.getObject(11).equals(java.sql.Time.valueOf("04:05:06")));
        assertTrue(rs.getObject(12).equals(java.sql.Timestamp.valueOf("2001-02-03 04:05:06.123456789")));
        assertTrue(rs.getObject(13).equals(java.sql.Timestamp.valueOf("2001-02-03 00:00:00")));
        assertEquals(new byte[] { 10, 20, 30 }, (byte[]) rs.getObject(14));
        assertTrue(rs.getObject(15).equals('a'));
        assertTrue(rs.getObject(16).equals(java.sql.Date.valueOf("2001-01-02")));
        assertTrue(rs.getObject(17) == null && rs.wasNull());
        assertTrue(rs.getObject(18).equals(new Double(3.725)));
        assertTrue(rs.getObject(19).equals(java.sql.Time.valueOf("23:22:21")));
        assertTrue(rs.getObject(20).equals(new java.math.BigInteger("12345")));

        // } else if(x instanceof java.io.Reader) {
        // return session.createLob(Value.CLOB,
        // TypeConverter.getInputStream((java.io.Reader)x), 0);
        // } else if(x instanceof java.io.InputStream) {
        // return session.createLob(Value.BLOB, (java.io.InputStream)x, 0);
        // } else {
        // return ValueBytes.get(TypeConverter.serialize(x));

        stat.execute("DROP TABLE TEST");

    }

    private void testIdentity(Connection conn) throws SQLException {
        Statement stat = conn.createStatement();
        stat.execute("CREATE SEQUENCE SEQ");
        stat.execute("CREATE TABLE TEST(ID INT)");
        PreparedStatement prep;
        prep = conn.prepareStatement("INSERT INTO TEST VALUES(NEXT VALUE FOR SEQ)");
        prep.execute();
        ResultSet rs = prep.getGeneratedKeys();
        rs.next();
        assertEquals(1, rs.getInt(1));
        assertFalse(rs.next());
        prep = conn.prepareStatement("INSERT INTO TEST VALUES(NEXT VALUE FOR SEQ)", Statement.RETURN_GENERATED_KEYS);
        prep.execute();
        rs = prep.getGeneratedKeys();
        rs.next();
        assertEquals(2, rs.getInt(1));
        assertFalse(rs.next());
        prep = conn.prepareStatement("INSERT INTO TEST VALUES(NEXT VALUE FOR SEQ)", new int[] { 1 });
        prep.execute();
        rs = prep.getGeneratedKeys();
        rs.next();
        assertEquals(3, rs.getInt(1));
        assertFalse(rs.next());
        prep = conn.prepareStatement("INSERT INTO TEST VALUES(NEXT VALUE FOR SEQ)", new String[] { "ID" });
        prep.execute();
        rs = prep.getGeneratedKeys();
        rs.next();
        assertEquals(4, rs.getInt(1));
        assertFalse(rs.next());
        stat.execute("DROP TABLE TEST");
    }

    private int getLength() {
        return getSize(LOB_SIZE, LOB_SIZE_BIG);
    }

    private void testBlob(Connection conn) throws SQLException {
        trace("testBlob");
        Statement stat = conn.createStatement();
        PreparedStatement prep;
        ResultSet rs;
        stat.execute("CREATE TABLE T_BLOB(ID INT PRIMARY KEY,V1 BLOB,V2 BLOB)");
        trace("table created");
        prep = conn.prepareStatement("INSERT INTO T_BLOB VALUES(?,?,?)");

        prep.setInt(1, 1);
        prep.setBytes(2, null);
        prep.setNull(3, Types.BINARY);
        prep.executeUpdate();

        prep.setInt(1, 2);
        prep.setBinaryStream(2, null, 0);
        prep.setNull(3, Types.BLOB);
        prep.executeUpdate();

        int length = getLength();
        byte[] big1 = new byte[length];
        byte[] big2 = new byte[length];
        for (int i = 0; i < big1.length; i++) {
            big1[i] = (byte) ((i * 11) % 254);
            big2[i] = (byte) ((i * 17) % 251);
        }

        prep.setInt(1, 3);
        prep.setBytes(2, big1);
        prep.setBytes(3, big2);
        prep.executeUpdate();

        prep.setInt(1, 4);
        ByteArrayInputStream buffer;
        buffer = new ByteArrayInputStream(big2);
        prep.setBinaryStream(2, buffer, big2.length);
        buffer = new ByteArrayInputStream(big1);
        prep.setBinaryStream(3, buffer, big1.length);
        prep.executeUpdate();
        try {
            buffer.close();
            trace("buffer not closed");
        } catch (IOException e) {
            trace("buffer closed");
        }

        prep.setInt(1, 5);
        buffer = new ByteArrayInputStream(big2);
        prep.setObject(2, buffer, Types.BLOB, 0);
        buffer = new ByteArrayInputStream(big1);
        prep.setObject(3, buffer);
        prep.executeUpdate();

        rs = stat.executeQuery("SELECT ID, V1, V2 FROM T_BLOB ORDER BY ID");

        rs.next();
        assertEquals(1, rs.getInt(1));
        assertTrue(rs.getBytes(2) == null && rs.wasNull());
        assertTrue(rs.getBytes(3) == null && rs.wasNull());

        rs.next();
        assertEquals(2, rs.getInt(1));
        assertTrue(rs.getBytes(2) == null && rs.wasNull());
        assertTrue(rs.getBytes(3) == null && rs.wasNull());

        rs.next();
        assertEquals(3, rs.getInt(1));
        assertEquals(big1, rs.getBytes(2));
        assertEquals(big2, rs.getBytes(3));

        rs.next();
        assertEquals(4, rs.getInt(1));
        assertEquals(big2, rs.getBytes(2));
        assertEquals(big1, rs.getBytes(3));

        rs.next();
        assertEquals(5, rs.getInt(1));
        assertEquals(big2, rs.getBytes(2));
        assertEquals(big1, rs.getBytes(3));

        assertFalse(rs.next());
    }

    private void testClob(Connection conn) throws SQLException {
        trace("testClob");
        Statement stat = conn.createStatement();
        PreparedStatement prep;
        ResultSet rs;
        stat.execute("CREATE TABLE T_CLOB(ID INT PRIMARY KEY,V1 CLOB,V2 CLOB)");
        StringBuilder asciiBuffer = new StringBuilder();
        int len = getLength();
        for (int i = 0; i < len; i++) {
            asciiBuffer.append((char) ('a' + (i % 20)));
        }
        String ascii1 = asciiBuffer.toString();
        String ascii2 = "Number2 " + ascii1;
        prep = conn.prepareStatement("INSERT INTO T_CLOB VALUES(?,?,?)");

        prep.setInt(1, 1);
        prep.setString(2, null);
        prep.setNull(3, Types.CLOB);
        prep.executeUpdate();

        prep.clearParameters();
        prep.setInt(1, 2);
        prep.setAsciiStream(2, null, 0);
        prep.setCharacterStream(3, null, 0);
        prep.executeUpdate();

        prep.clearParameters();
        prep.setInt(1, 3);
        prep.setCharacterStream(2, new StringReader(ascii1), ascii1.length());
        prep.setCharacterStream(3, null, 0);
        prep.setAsciiStream(3, new ByteArrayInputStream(ascii2.getBytes()), ascii2.length());
        prep.executeUpdate();

        prep.clearParameters();
        prep.setInt(1, 4);
        prep.setNull(2, Types.CLOB);
        prep.setString(2, ascii2);
        prep.setCharacterStream(3, null, 0);
        prep.setNull(3, Types.CLOB);
        prep.setString(3, ascii1);
        prep.executeUpdate();

        prep.clearParameters();
        prep.setInt(1, 5);
        prep.setObject(2, new StringReader(ascii1));
        prep.setObject(3, new StringReader(ascii2), Types.CLOB, 0);
        prep.executeUpdate();

        rs = stat.executeQuery("SELECT ID, V1, V2 FROM T_CLOB ORDER BY ID");

        rs.next();
        assertEquals(1, rs.getInt(1));
        assertTrue(rs.getCharacterStream(2) == null && rs.wasNull());
        assertTrue(rs.getAsciiStream(3) == null && rs.wasNull());

        rs.next();
        assertEquals(2, rs.getInt(1));
        assertTrue(rs.getString(2) == null && rs.wasNull());
        assertTrue(rs.getString(3) == null && rs.wasNull());

        rs.next();
        assertEquals(3, rs.getInt(1));
        assertEquals(ascii1, rs.getString(2));
        assertEquals(ascii2, rs.getString(3));

        rs.next();
        assertEquals(4, rs.getInt(1));
        assertEquals(ascii2, rs.getString(2));
        assertEquals(ascii1, rs.getString(3));

        rs.next();
        assertEquals(5, rs.getInt(1));
        assertEquals(ascii1, rs.getString(2));
        assertEquals(ascii2, rs.getString(3));

        assertFalse(rs.next());
        assertTrue(prep.getWarnings() == null);
        prep.clearWarnings();
        assertTrue(prep.getWarnings() == null);
        assertTrue(conn == prep.getConnection());
    }

    private void checkBigDecimal(ResultSet rs, String[] value) throws SQLException {
        for (String v : value) {
            assertTrue(rs.next());
            java.math.BigDecimal x = rs.getBigDecimal(1);
            trace("v=" + v + " x=" + x);
            if (v == null) {
                assertTrue(x == null);
            } else {
                assertTrue(x.compareTo(new java.math.BigDecimal(v)) == 0);
            }
        }
        assertTrue(!rs.next());
    }

}
