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How To Use Java SQL Developer With AJAX To Connect To Angular

Hello developer! It’s no secret that creating large, dynamic applications so that they can query the database is a rather time-consuming process even for an experienced developer. The technologies that you can see in the title of this article ‘How To Use Java SQL Developer With AJAX To Connect To Angular’ may sound scary, but I will try to make sure that everyone understands what is at stake. I decided to approach the issue of how to connect your Angular application to an Oracle database using JAVA very seriously and therefore I wrote about everything in detail in this article. Let’s start from the beginning and understand all the information about technologies that you need to use.

The first question that may arise is ‘What is the Java SQL Developer and why I need to use it in such a case?’ Oracle SQL Developer is a graphical tool that improves performance and simplifies database development tasks. The presence of an embedded Java virtual machine in Oracle is an additional feature in relation to the base distribution. You can connect to any target Oracle database schema using standard Oracle database authentication. It is written in the Java programming language and supports all technologies that use it. SQL Developer allows you to view database objects, run various SQL statements, create and edit database objects, import and export data, and create all kinds of reports. You can connect to any target Oracle database schema using standard Oracle database authentication. When you connect once, you can perform operations on objects in the database. Oracle Corporation provides the product free for developers. It natively supports work with Oracle Database, there are plug-ins that provide connection from the environment to other database management systems, in particular, access to IBM DB2, Microsoft Access, Microsoft SQL Server and others is implemented. SQL Developer requires Java SE to run, so you must have the Java Development Kit (JDK) installed on your computer, free Java development kit that includes a standard compiler, Java class libraries, and the JRE. The disadvantages of SQL Developer include a somewhat unusual interface (based on Java graphical components) and high resource consumption (especially in terms of RAM). In addition, on Windows, all SQL Developer settings (including, for example, custom report and snippet definitions) are stored not in the registry, but in XML files in the user profile, which must also be taken into account. Oracle SQL Developer provides direct editing capabilities for records in database tables. To do this, select the Edit command from the context menu for the table in the Connections window, and then go to the Data tab. Oracle SQL Developer provides a means of transferring information between different data sources, such as from a SQL Server database to Oracle. The means for performing such a transfer are concentrated in the Migration menu. It can be concluded that for the Angular application, which contains a database, the use of this technology is simply necessary. 

The use and development of AJAX has become very popular among developers. In fact, AJAX is not a new technology, since both JavaScript and XML have been around for quite some time, and AJAX is a synthesis of these technologies. AJAX is most often associated with the term Web 2.0 and touted as the newest Web application. With AJAX, there is no need to refresh the entire page every time, as only a specific part of it is updated. It is much more convenient, since you do not have to wait long, and more economical, since not everyone has unlimited Internet. True, in this case, the developer needs to make sure that the user is aware of what is happening on the page. This can be done using loading indicators, text messages that there is an exchange of data with the server. It should also be understood that not all browsers support AJAX (older versions of browsers and text browsers). Plus JavaScript can be disabled by the user. Therefore, you should not abuse the use of technology and resort to alternative methods of presenting information on the website. There are two ways to exchange data with the server. The first way is a GET request. In this request, you are accessing a document on the server by passing arguments to it via the URL itself. In this case, on the client side, it will be logical to use the JavaScript escape function so that some data does not interrupt the request. As it was stated, AJAX uses asynchronous data transfer. This means that while the data is being transferred, the user can perform other actions he needs. At this time, you should notify the user that some data exchange is in progress, otherwise the user will think that something has happened wrong and may leave the site, or re-call the function “frozen”, in his opinion.

Let’s move on to the main question of this article about the way to connect your Angular application to the Oracle database. It is possible to do such an operation with the help of RESTful web service. Angular uses RESTful web services to query and store data. RESTful Web Service is a Web Service based on the REST framework.  REST architecture has proven itself over the past 16 years in the practice of the web. Since web services are part of the web, many companies / developers / researchers have decided to use the REST architecture in the case of web services, which will improve the scalability of components, ensure security, independent deployment, etc. In your case, you can use the Spring framework to create RESTful web services and send and receive data using POST / GET calls (To create a resource on the server, you need to use the POST  / To get a resource, use GET). In fact, the Spring Framework is just a dependency injection container, with a few convenient layers (for example: database access, proxies, aspect-oriented programming, RPC, MVC web framework). This all allows you to create Java applications faster and more conveniently. Implementing a RESTful web service is up to you. It can be done in any technology stack.
To put it all together on your Angular application, write this:


app.controller (‘AppName’, function ($scope, $http){
      $scope.datas = [ ];

      $http.get (‘URI from Web Service’)
      .success (function (retorno){ 
            $scope.datas = retorno.msg;

 })
        .error (function (error){
            console.log (error);

  });

  });

How to check connection to Oracle database using Java?


DriverManager#getConnection it itself tries to establish a connection to the given URL database. DriverManager tries to select a suitable driver from a set of registered JDBC drivers. and thorws SQLException if a database access error occurs. You can check if your connection is valid or not with the Connection function#isValid(int timeout) returns true if the connection has not been closed and is still valid. Also you can have an array of IP addresses of your database server and iterate over them. For each unsuccessful connection attempt, you can go to the next ip-address from the array and try again. If the connection is successful, you break the loop there and use the current connection that was established.

Conclusion

After reading thе article ‘How To Use Java SQL Developer With AJAX To Connect To Angular’, you should have an idea of how to connect the Angular application to the Oracle-based database. It’s not so hard if you first understand all the technologies involved and how they work or maybe you can hire an expert angular developer. Thanks for reading!

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