Oracle database connection source codes

Small example console source codes how to connect to the Oracle database, how to update rows and how to read the table.

Running under Windows

1. clone this repository to your computer
2. install the Oracle database (as a Docker container)
3. prepare the user, the table and rows in the database
4. build and run the example Java code
5. compile and run the example .NET C# code
6. run the example PHP code

1. Cloning to your computer

• install GIT on your computer
• clone this repository to your computer by the GIT command git clone https://github.com/petrfaltus/oracle-database-connection-source-codes.git

2. Installation of the Oracle database (as a Docker container)

• install docker desktop on your computer
• refer the Oracle Database Enterprise Edition image

The subdirectory docker-database contains prepared Windows batches:

• 01-run-database.cmd - pulls the image (the download size is about 2GB) and runs the container at the first time (takes a time until ready)
• 02-switch-database-OFF.cmd - stops the already existing container
• 02-switch-database-ON.cmd - starts the already existing container (takes a time until ready)
• 03-inspect-database.cmd - shows details for already existing container
• 04-exec-connection-to-database.cmd - executes the SQL Plus terminal into running database container
• containers.cmd - lists currently running containers and list of all existing containers

3. Preparing the database

For the connection to the database use either the SQL Plus terminal or the Oracle SQL Developer

Connection using SQL Plus

User sys (default password Oradoc_db1)

CONNECT sys AS SYSDBA;
ALTER SESSION SET "_ORACLE_SCRIPT"=true;

User testuser (default password T3stUs3r!)

CONNECT testuser;
ALTER SESSION SET "_ORACLE_SCRIPT"=true;

Connection using SQL Developer

User sys (default password Oradoc_db1)

User testuser (default password T3stUs3r!)

SQL lines for sys

CREATE USER testuser IDENTIFIED BY "T3stUs3r!";
GRANT ALL PRIVILEGES TO testuser;

SQL lines for testuser

CREATE TABLE CARS
  (
   MANUFACTURER VARCHAR2(40 BYTE) NOT NULL,
   MODEL VARCHAR2(50 BYTE) NOT NULL,
   DOORS NUMBER(2,0) NOT NULL,
   CREATED TIMESTAMP(6) DEFAULT CURRENT_TIMESTAMP,
   UPDATED TIMESTAMP(6),
   REMARK VARCHAR2(80 BYTE),
   ID NUMBER(6,0) GENERATED ALWAYS AS IDENTITY START WITH 1 INCREMENT BY 1 NOT NULL,
   PRIMARY KEY (ID)
  );

CREATE OR REPLACE TRIGGER CARS_UPDATE
  BEFORE UPDATE ON CARS
  FOR EACH ROW
BEGIN
  :NEW.UPDATED := CURRENT_TIMESTAMP;
END;

INSERT INTO CARS (MANUFACTURER, MODEL, DOORS) VALUES ('Hyundai', 'Veloster', 3);
INSERT INTO CARS (MANUFACTURER, MODEL, DOORS) VALUES ('Skoda', 'Fabia', 5);
INSERT INTO CARS (MANUFACTURER, MODEL, DOORS) VALUES ('Volkswagen', 'Passat', 4);
INSERT INTO CARS (MANUFACTURER, MODEL, DOORS) VALUES ('Ford', 'Saloon', 4);
INSERT INTO CARS (MANUFACTURER, MODEL, DOORS) VALUES ('Ford', 'Focus', 5);

CREATE OR REPLACE PACKAGE CALCULATOR AS
  FUNCTION FACTORIAL(N INTEGER) RETURN INTEGER;
  PROCEDURE ADD_AND_SUBTRACT(A INTEGER, B INTEGER, X OUT INTEGER, Y OUT INTEGER);
END;
/

CREATE OR REPLACE PACKAGE BODY CALCULATOR AS
  FUNCTION FACTORIAL(N INTEGER) RETURN INTEGER IS
    RESULT INTEGER := 1;
  BEGIN
    IF N < 0 THEN
      RETURN -1;
    END IF;
    IF N < 2 THEN
      RETURN RESULT;
    END IF;
    FOR IJK IN 2 .. N LOOP
      RESULT := RESULT * IJK;
    END LOOP;
    RETURN RESULT;
  END;
  PROCEDURE ADD_AND_SUBTRACT(A INTEGER, B INTEGER, X OUT INTEGER, Y OUT INTEGER) IS
  BEGIN
    X := A + B;
    Y := A - B;
  END;
END;
/

optional SQL check lines for testuser

SELECT * FROM CARS;

SELECT COUNT(*) FROM CARS;
SELECT COUNT(*) FROM CARS WHERE ID!=1;

SELECT CALCULATOR.FACTORIAL(2) FROM DUAL;
SELECT CALCULATOR.FACTORIAL(3) FROM DUAL;
SELECT CALCULATOR.FACTORIAL(4) FROM DUAL;

SET serveroutput on;
DECLARE
  a INTEGER := 12;
  b INTEGER := 5;
  x INTEGER;
  y INTEGER;
BEGIN
  dbms_output.put_line('a = ' || a);
  dbms_output.put_line('b = ' || b);
  CALCULATOR.ADD_AND_SUBTRACT(a, b, x, y);
  dbms_output.put_line('x = ' || x);
  dbms_output.put_line('y = ' || y);
END;
/

4. The Java client source code

• install Java JDK on your computer
• set the OS environment %JAVA_HOME% variable (must exist "%JAVA_HOME%\bin\java.exe")

4.1. Apache Maven

• install Apache Maven on your computer
• add the Maven directory (where the batch mvn.cmd locates) to the OS environment %PATH% variable

The subdirectory java-maven contains prepared Windows batches:

• 01-build.cmd - cleans, compiles and builds the Maven project
• 02-run.cmd - runs the built Java archive (JAR)
• 03-clean.cmd - cleans the Maven project

4.2. Gradle Build Tool

• install Gradle Build Tool on your computer
• add the Gradle directory (where the batch gradle.bat locates) to the OS environment %PATH% variable

The subdirectory java-gradle contains prepared Windows batches:

• 01-build.cmd - cleans, compiles and builds the Gradle project
• 02-run.cmd - runs the built Java archive (JAR)
• 03-clean.cmd - cleans the Gradle project

5. The .NET C# client source code

• use the csc.exe .NET C# compiler that is the part of Microsoft .NET Framework (part of OS)
• install Oracle Data Provider for .NET on your computer
• check the right Oracle.ManagedDataAccess.dll from Oracle Data Provider for .NET in the csharp\bin directory

The subdirectory csharp contains prepared Windows batches:

• 01-compile.cmd - compiles the source code (contains the path definition to the csc.exe compiler)
• 02-run.cmd - runs the Windows executable
• 03-clean.cmd - deletes the Windows executable

6. The PHP client source code

• install PHP on your computer
• set the OS environment %PHP_HOME% variable (must exist "%PHP_HOME%\php.exe")
• install Microsoft Visual C++ Redistributable for Visual Studio 2015, 2017 and 2019
• install Oracle Instant Client
• copy oci.dll, oraociei19.dll and oraons.dll from Oracle Instant Client to the PHP directory %PHP_HOME%

To the php.ini in the PHP directory %PHP_HOME% add lines

[PHP]
extension_dir = "ext"
extension=pdo_oci

[Date]
date.timezone = Europe/Prague

The subdirectory php contains prepared Windows batch:

• 01-run.cmd - runs the code through the PHP interpreter

Versions

Now in August 2020 I have the computer with Windows 10 Pro 64bit, 12GB RAM and available 50GB free HDD space

Tool	Version	Setting
GIT	2.26.0.windows.1
docker desktop	2.3.0.4 (46911) stable	2 CPUs, 3GB memory, 1GB swap, 48GB disc image size
Oracle Database Enterprise Edition image	12.2.0.1	default password for sys: Oradoc_db1
Oracle SQL Developer	20.2.0
Java JDK	14.0.1	Java(TM) SE Runtime Environment (build 14.0.1+7)
Apache Maven	3.6.3
Gradle Build Tool	6.3
.NET C# compiler	4.8.3752.0
Oracle Data Provider for .NET	12.2	ODP.NET_Managed_ODAC122cR1.zip
PHP	7.4.4	7.4.4-nts-Win32-vc15-x64
Microsoft Visual C++ Redistributable for Visual Studio 2015, 2017 and 2019		VC_redist.x64.exe
Oracle Instant Client	19.6.0.0.0	instantclient-basic-windows.x64-19.6.0.0.0dbru.zip

To do (my plans to the future)