通过HSBroker的用户名密码认证实现查询HetuEngine SQL任务

功能简介

通过HSBroker连接方式实现，使用用户名和密码连接到HetuEngine，组装对应的SQL发送到HetuEngine执行。

public class JDBCExampleBroker {    
    private static Properties properties = new Properties();
    private static void init() throws ClassNotFoundException {
        // 认证用的密码写入代码中或者明文存储都有很大的安全风险，建议在配置文件或者环境变量中密文存放，使用时解密，确保安全;
        // 本示例以密码保存在环境变量中来实现身份验证为例，运行本示例前，请先在本地环境中设置环境变量HETUENGINE_PASSWORD
        properties.setProperty("user", "YourUserName");
        String password = System.getenv("HETUENGINE_PASSWORD");
        properties.setProperty("password",password);
        Class.forName("io.XXXsql.jdbc.XXXDriver");
    }
    public static void main(String[] args){
        Connection connection = null;
        ResultSet resultSet = null;
        PreparedStatement statement = null;
        String url = "jdbc:XXX://192.168.1.130:29860,192.168.1.131:29860/hive/default?serviceDiscoveryMode=hsbroker";
        try {
            init();
            String sql = "show tables";
            connection = DriverManager.getConnection(url, properties);
            statement = connection.prepareStatement(sql.trim());
            resultSet = statement.executeQuery();
            Integer colNum = resultSet.getMetaData().getColumnCount();
            while (resultSet.next()) {
                for (int i = 1; i <= colNum; i++) {
                    System.out.println(resultSet.getString(i) + "\t");
                }
            }
        } catch (SQLException | ClassNotFoundException e) {
            e.printStackTrace();
        } finally {
            if (resultSet != null) {
                try {
                    resultSet.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
            if (statement != null) {
                try {
                    statement.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
            if (connection != null) {
                try {
                    connection.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

上述代码中各参数说明如表1所示：