Why does a Oracle-DB-Connection can not be established with Matlab 2018?

Question

Thomas Anvidalfarei 2018-5-9

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https://ww2.mathworks.cn/matlabcentral/answers/399838-why-does-a-oracle-db-connection-can-not-be-established-with-matlab-2018

编辑： Arpan Badeka 2018-8-29

My function establishes a connection with an oracle database. Executing the following function (sorry, critical variables are defined with * here) with Matlab 2017a a connection can be established. The connection can not be established with Matlab 2018a. Can somebody help me out?

%%Vers. 2017/18
% DB settings
DB = '***';
user = '***';
password = '***';
vendor = 'Oracle';
dbConnStr = ['jdbc:oracle:thin:@(DESCRIPTION=' ...
    '(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=***)' ...
    '(PORT=1521))(ADDRESS=(PROTOCOL=TCP)' ...
    '(HOST=***)(PORT=1521)))'...
    '(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=ORCP)'...
    '(INSTANCE_NAME=MULTITGP)))'];
%%In case add jdbcDriver
jdbcDriverPath = fullfile('jdbc_driver','ojdbc6.jar');                      % jdbc_driver is a folder in pwd with ojdbc6.jar in it
if ~ismember(fullfile(matlabroot,'java','jar',jdbcDriverPath),...
        javaclasspath('-static'))...                                        % static
        &&  ~ismember(fullfile(pwd,jdbcDriverPath),...
        javaclasspath('-dynamic'))                                          % dynamic
    javaaddpath(jdbcDriverPath);
end
%%Establish connection
conn = database(DB,user,password,...
    'Vendor',vendor,...
    'URL',dbConnStr);
%%Connection check
if isopen(conn)
    msgbox('Connection OK');
     close(conn);
else
    msgbox('Connection FAIL')
end

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Sharannya Ranjith 2018-5-11

Can you please verify that the "databasename" field refers to the the instance name of your database and not the schema name?

Also ensure that you have added the full path of the JDBC driver to the classpath.txt file and verify the server name and port number for your Oracle database.

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Answer 1

Arpan Badeka 2018-6-22

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https://ww2.mathworks.cn/matlabcentral/answers/399838-why-does-a-oracle-db-connection-can-not-be-established-with-matlab-2018#answer_325856

编辑：Arpan Badeka 2018-8-29

在 MATLAB Online 中打开

Hi Thomas

The connection command used to setup the connection doesn’t seem to be correct. Please user either of the following commands to setup the connection:

1. 
  datasource = 'dbname';
  username = 'username';
  password = 'pwd';
  driver = 'oracle.jdbc.driver.OracleDriver';
  url = 'jdbc:oracle:thin://host:port/dbname';
    conn = database(datasource,username,password,driver,url)
 2. 
   datasource = 'toy_store';
   conn = database(datasource,username,password,'Vendor','ORACLE', ...
         'Server','dbtbxx','PortNumber',1521, ...
         'DriverType','thin')