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The AceQL Java Client SDK allows to wrap the AceQL HTTP APIs and eliminate the tedious works of handling communications errors and parsing JSON results. Android and Java Desktop application developers can access remote SQL databases and/or SQL databases in the cloud by simply including standard JDBC calls in their code, just like they would for a local database.
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/*
 * This file is part of AceQL Client SDK.
 * AceQL Client SDK: Remote JDBC access over HTTP with AceQL HTTP.
 * Copyright (C) 2020,  KawanSoft SAS
 * (http://www.kawansoft.com). All rights reserved.
 *
 * 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 com.aceql.client.test.http;

import static org.junit.Assert.fail;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import org.apache.commons.io.FileUtils;
import org.junit.Test;

import com.aceql.client.jdbc.AceQLConnection;
import com.aceql.client.jdbc.AceQLException;
import com.aceql.client.test.connection.ConnectionBuilder;
import com.aceql.client.test.connection.ConnectionParms;

public class AceQLHttpConnectionTest {

    private AceQLConnection connection = null;

    public Connection getConnection() throws SQLException, IOException {

	if (!new File(ConnectionParms.IN_DIRECTORY).exists()) {
	    new File(ConnectionParms.IN_DIRECTORY).mkdirs();
	}
	if (!new File(ConnectionParms.OUT_DIRECTORY).exists()) {
	    new File(ConnectionParms.OUT_DIRECTORY).mkdirs();
	}

	return ConnectionBuilder.createOnConfig();
    }

    @Test
    public void testConnect() {
	Connection connection = null;
	try {
	    connection = getConnection();
	    assert (connection != null);
	} catch (final Exception e) {
	    fail(e.getMessage());
	}

    }

    @Test
    public void testFailedQuery() {
	String sql = "select * from not_exist_table";
	try {

	    Statement statement = getConnection().createStatement();
	    ResultSet rs = statement.executeQuery(sql);

	    boolean hasRows = false;
	    if (rs.next()) {
		hasRows = true;
	    }

	    assert (!hasRows);
	} catch (final Exception e) {
	    // fail(e.getMessage());
	    assert (e instanceof AceQLException);
	}
    }

    @Test
    public void testAutoCommit() {
	try {
	    final boolean originalState = getConnection().getAutoCommit();
	    getConnection().setAutoCommit(!originalState);
	    assert (originalState != getConnection().getAutoCommit());
	    getConnection().setAutoCommit(originalState);
	    assert (originalState == getConnection().getAutoCommit());
	} catch (final Exception e) {
	    fail(e.getMessage());
	}
    }

    @Test
    public void testHoldability() {
	try {
	    getConnection().setAutoCommit(true);
	    int originalState = getConnection().getHoldability();

	    getConnection().setHoldability(ResultSet.HOLD_CURSORS_OVER_COMMIT);
	    assert (getConnection()
		    .getHoldability() == ResultSet.HOLD_CURSORS_OVER_COMMIT);

	    getConnection().setHoldability(ResultSet.CLOSE_CURSORS_AT_COMMIT);
	    assert (getConnection()
		    .getHoldability() == ResultSet.CLOSE_CURSORS_AT_COMMIT);

	    getConnection().setHoldability(originalState);
	    assert (getConnection().getHoldability() == originalState);
	} catch (final Exception e) {
	    fail(e.getMessage());
	}
    }

    @Test
    public void testTransactionIsolation() {
	try {
	    int originalState = getConnection().getTransactionIsolation();
	    System.out.println("getConnection().getTransactionIsolation(): "
		    + getConnection().getTransactionIsolation());

	    getConnection().setTransactionIsolation(
		    Connection.TRANSACTION_READ_UNCOMMITTED);
	    System.out.println("getConnection().getTransactionIsolation(): "
		    + getConnection().getTransactionIsolation());
	    assert (getConnection()
		    .getTransactionIsolation() == Connection.TRANSACTION_READ_UNCOMMITTED);

	    getConnection().setTransactionIsolation(
		    Connection.TRANSACTION_READ_COMMITTED);
	    System.out.println("getConnection().getTransactionIsolation(): "
		    + getConnection().getTransactionIsolation());
	    assert (getConnection()
		    .getTransactionIsolation() == Connection.TRANSACTION_READ_COMMITTED);

	    getConnection().setTransactionIsolation(
		    Connection.TRANSACTION_REPEATABLE_READ);
	    System.out.println("getConnection().getTransactionIsolation(): "
		    + getConnection().getTransactionIsolation());
	    assert (getConnection()
		    .getTransactionIsolation() == Connection.TRANSACTION_REPEATABLE_READ);

	    getConnection().setTransactionIsolation(
		    Connection.TRANSACTION_SERIALIZABLE);
	    System.out.println("getConnection().getTransactionIsolation(): "
		    + getConnection().getTransactionIsolation());
	    assert (getConnection()
		    .getTransactionIsolation() == Connection.TRANSACTION_SERIALIZABLE);

	    getConnection().setTransactionIsolation(originalState);
	    assert (getConnection().getTransactionIsolation() == originalState);

	} catch (final Exception e) {
	    fail(e.getMessage());
	}
    }

    @Test
    public void testInsert() {
	try {
	    getConnection().setAutoCommit(false);

	    String sql = "delete from customer where customer_id >= 0 ";
	    PreparedStatement preparedStatement = getConnection()
		    .prepareStatement(sql);
	    preparedStatement.executeUpdate();
	    preparedStatement.close();

	    for (int i = 1; i < 10; i++) {
		int customerId = i;

		sql = "insert into customer values (?, ?, ?, ?, ?, ?, ?, ?)";
		preparedStatement = connection.prepareStatement(sql);

		int j = 1;
		preparedStatement.setInt(j++, customerId);
		preparedStatement.setString(j++, null);
		preparedStatement.setString(j++, "Andr?" + customerId);
		preparedStatement.setString(j++, "Smith_" + customerId);
		preparedStatement.setString(j++, customerId + " C?sar Avenue");
		preparedStatement.setString(j++, "Town_" + customerId);
		preparedStatement.setString(j++, customerId + "");
		preparedStatement.setString(j++, customerId + "-12345678");
		int rowCount = preparedStatement.executeUpdate();
		preparedStatement.close();
		assert (rowCount == 1);
	    }

	    getConnection().commit();
	} catch (final Exception e) {
	    fail(e.getMessage());
	}
    }

    @Test
    public void testSelect() {
	try {
	    String sql = "select * from customer order by customer_id limit 3";
	    PreparedStatement preparedStatement = getConnection()
		    .prepareStatement(sql);

	    ResultSet rs = preparedStatement.executeQuery();

	    int cpt = 0;
	    while (rs.next()) {
		cpt++;
		String fname = rs.getString("fname");
		assert (fname.equals("Andr?" + cpt));

		int i = 1;
		System.out.println();
		System.out.println("customer_id   : " + rs.getInt(i++));
		System.out.println("customer_title: " + rs.getString(i++));
		System.out.println("fname         : " + rs.getString(i++));
		System.out.println("lname         : " + rs.getString(i++));
		System.out.println("addressline   : " + rs.getString(i++));
		System.out.println("town          : " + rs.getString(i++));
		System.out.println("zipcode       : " + rs.getString(i++));
		System.out.println("phone         : " + rs.getString(i++));

	    }
	    assert (cpt == 3);

	} catch (final Exception e) {
	    fail(e.getMessage());
	}
    }

    @Test
    public void testSelectPrepStatement() {
	try {
	    String sql = "select * from customer where customer_id = ?";
	    PreparedStatement preparedStatement = getConnection()
		    .prepareStatement(sql);
	    preparedStatement.setInt(1, 3);

	    ResultSet rs = preparedStatement.executeQuery();

	    String fname = null;

	    if (rs.next()) {
		fname = rs.getString("fname");
	    }

	    System.out.println("fname: " + fname);

	    assert (fname.equals("Andr?3"));

	} catch (final Exception e) {
	    fail(e.getMessage());
	}
    }

    @Test
    public void testBlobInsert() {
	try {
	    getConnection().setAutoCommit(false);

	    String sql = "delete from orderlog where customer_id >= 0 ";
	    PreparedStatement preparedStatement = getConnection()
		    .prepareStatement(sql);
	    preparedStatement.executeUpdate();
	    preparedStatement.close();

	    int customerId = 1;
	    int itemId = 1;

	    File file = new File(ConnectionParms.IN_DIRECTORY  + File.separator + "username_koala.jpg");

	    if (!file.exists()) {
		throw new FileNotFoundException("file does not exist:" + file);
	    }

	    sql = "insert into orderlog values (?, ?, ?, ?, ?, ?, ?, ?, ?)";
	    preparedStatement = connection.prepareStatement(sql);

	    InputStream in = new FileInputStream(file);
	    int j = 1;
	    preparedStatement.setInt(j++, customerId);
	    preparedStatement.setInt(j++, itemId);
	    preparedStatement.setString(j++, "description_" + itemId);
	    preparedStatement.setInt(j++, itemId * 1000);
	    preparedStatement.setDate(j++,
		    new java.sql.Date(System.currentTimeMillis()));
	    preparedStatement.setTimestamp(j++,
		    new java.sql.Timestamp(System.currentTimeMillis()));
	    preparedStatement.setBinaryStream(j++, in);
	    preparedStatement.setInt(j++, customerId);
	    preparedStatement.setInt(j++, itemId * 1000);

	    int rowCount = preparedStatement.executeUpdate();

	    assert (rowCount == 1);
	    preparedStatement.close();

	    connection.commit();
	} catch (final Exception e) {
	    fail(e.getMessage());
	}
    }

    @Test
    public void testBlobSelect() {
	try {
	    getConnection().setAutoCommit(false);

	    String sql = "select * from orderlog where customer_id = 1";
	    PreparedStatement preparedStatement = connection
		    .prepareStatement(sql);
	    ResultSet rs = preparedStatement.executeQuery();

	    File file = null;

	    while (rs.next()) {
		int i = 1;
		System.out.println();
		System.out.println("customer_id   : " + rs.getInt(i++));
		System.out.println("item_id       : " + rs.getInt(i++));
		System.out.println("description   : " + rs.getString(i++));
		System.out.println("item_cost     : " + rs.getInt(i++));
		System.out.println("date_placed   : " + rs.getDate(i++));
		System.out.println("date_shipped  : " + rs.getTimestamp(i++));
		System.out.println("jpeg_image    : " + "");

		file = new File(ConnectionParms.OUT_DIRECTORY + File.separator + "downloaded_new_blob.jpg");

		try (InputStream in = rs.getBinaryStream(i++);){
		    FileUtils.copyToFile(in, file);
		}

		System.out.println("is_delivered  : " + rs.getBoolean(i++));
		System.out.println("quantity      : " + rs.getInt(i++));

		System.out.println("Blob Downloaded: " + file);

	    }

	    getConnection().commit();
	    preparedStatement.close();
	    rs.close();

	    assert (file.exists());
	    assert (file.length() > 1);

	    FileUtils.deleteQuietly(file);

	    assert (!file.exists());
	} catch (final Exception e) {
	    fail(e.getMessage());
	}
    }

}