https://github.com/isghe/oracle-java-examples
simple oracle java examples
https://github.com/isghe/oracle-java-examples
betterway connection correctway database example-codes examples goodway helloworld java ojdbc7 oracle sql transaction wrongway
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simple oracle java examples
- Host: GitHub
- URL: https://github.com/isghe/oracle-java-examples
- Owner: isghe
- Created: 2019-10-27T12:37:16.000Z (over 5 years ago)
- Default Branch: master
- Last Pushed: 2021-12-03T14:48:07.000Z (over 3 years ago)
- Last Synced: 2025-02-16T21:43:00.106Z (3 months ago)
- Topics: betterway, connection, correctway, database, example-codes, examples, goodway, helloworld, java, ojdbc7, oracle, sql, transaction, wrongway
- Language: Java
- Homepage:
- Size: 313 KB
- Stars: 0
- Watchers: 2
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- Funding: .github/FUNDING.yml
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README
# Oracle Java Examples
Simple examples, showing how to connect to ORACLE DB, with Java `ojdbc` driver, and how to make inserts without polluting ORACLE environment.
It's important to understand that polluting the ORACLE environment, without closing the opened connection, at the end, it will lock the system.
## Table of contents
* [Examples](#examples)
* [Compatibility](#compatibility)
* [Install](#install)
* [Configure](#configure)
* [Compile](#compile)
* [Run](#run)
* [Monitor](#monitor)
* [Disclaimer](#disclaimer)
* [Donations](#donations)
## Examples
The examples are:
* `HelloWorld`:
Just a simple query to table `DUAL`;
* `WrongWay`:
Inserts data in table `TEST_INSERT`, in wrong way: opens the connection for each insert, without closing the connection. Because of that it's polluting the ORACLE environment with tons of SESSIONS_PER_USER, until the system resources run out!
* `CorrectWay`:
Just closes the balanced connection with the open ones. At least it's not polluting the ORACLE environment; but it's unnecessary opening and closing the connection for each insert;
* `GoodWay`:
Opens the connection to ORACLE only one time, closing it only one time at the end of the program;
* `BetterWay`:
One connection, one commit.
## Compatibility
Tested on:
* `macOS Mojave 10.14.6`
* java: `1.8.0_66`
* javac: `1.8.0_66`
* `Oracle Linux Server 7.5`
* `Oracle Database 18c Express Edition`
* java: `1.8.0_151`
* javac `1.8.0_151`
## Install
Download `ojdbc7.jar` from [jdbc-drivers-12c-downloads](https://www.oracle.com/database/technologies/jdbc-drivers-12c-downloads.html) and copy it in `lib/` folder.
To run the examples `WrongWay`, `CorrectWay`, `GoodWay`, `BetterWay`, execute the script in `sql/create-table_test_insert.sql`; it will create the table `TEST_INSERT` in your DB.
## Configure
Copy `Configure/Credentials-template.java` to `Configure/Credentials.java` and modify the credentials you need (url, user and password).
## Compile
`$ cd examples/HelloWorld`
`$ . ../../script/compile.sh`
## Run
`. ../../script/run.sh`
## Monitor
To monitor the SESSIONS_PER_USER execute the query in `sql/sessions_per_user.sql`
MonitorWrongWay,: 61 SESSIONS_PER_USER polluting ORACLE environment:
MonitorCorrectWay: just 3 SESSIONS_PER_USER:
## Disclaimer
Don't use this repo in production, it's only an academic collection of examples; production is on another layer.
Use at your own risk.
## Donations
Donations are welcome at Bitcoin address: `1Java1MmYqF3hTQmvwjtT3k8Dbc6HHd7Tv`
Almaty, Kazakistan, 28 Ottobre 2019
Isidoro Ghezzi