By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I am trying to retrieve the data from database and display it out in jSON format. I am using MySQl as a database. Below is the data result from Database table with select query:.

I need help to display the data in correct JSON format. Any suggestions are always welcome. Learn more. Retrieving Data from Database and show in the json format Ask Question. Asked 1 year, 11 months ago.

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Active 1 year, 11 months ago. Viewed times. Below is my java code in JsonServlet. IOException; import java. PrintWriter; import java. Connection; import java. DriverManager; import java. PreparedStatement; import java. ResultSet; import javax. ServletException; import javax.

WebServlet; import javax. HttpServlet; import javax. HttpServletRequest; import javax.

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HttpServletResponse; import org. Keren Caelen 1, 2 2 gold badges 16 16 silver badges 35 35 bronze badges.You must be logged to download. Click here to login. No, I'd like to download without make the donation.

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JSON is quite simple, easy and light-weight format for exchanging and storing data from and to database. The number of columns should not be less than the required fields in the JSON file.

how to retrieve data from database in json format using java

In my case, I have created a table with the required fields as shown below:. Once you have created a database having table with the required fields, the next step is to connect that database with the PHP file. For this, a PHP file is to be made, which is given as:. Please Fix the Issue! Once connection is made and a database is selected, then you can go further for the next operation, otherwise an error will be displayed for fixing the issues.

This function reads the contents of the given file to a string. The next step is to fetch the decoded values and store it in variables of PHP. This can be done by fetching one-by-one and storing it in different variables. It is important to note that the names of table columns in the database should be written correctly as present in the database otherwise the data will not be inserted in the database.

Once you are done with the above defined steps, then there should not be any problem in inserting JSON data in database. Run the above code and you will get the output as follow:. Refresh your database and you will see that data is inserted successfully.

The output for the database will be as follow:. You can see in the above snapshot that the data is inserted properly in the relevant columns.

how to retrieve data from database in json format using java

If you want to add more data in the columns of the table, change the data in the JSON file or add another JSON file with different name and run the code again. The next step is the reverse of the above i. In this part, we are going to extract the data that is being stored in database and put in the provided JSON file. This process is among the most widely used processes by web developers now a day. For this to start, you should have a database created with proper table and columns as discussed above.

This process also needs few steps to be kept in mind for making it convenient for the successful occurrence of such process. Let's start with defining each step one by one:. As defined above, the first and foremost task is to connect your database with the PHP. I am using the same database and same database connection as discussed above. After proper connection, the next steps will take place otherwise an error message will be displayed. The code for connection is as given brlow:.

Now after fetching the data, the data is to be stored in PHP arrays. For this, create a variable and assign an empty array to that variable.Comment 1. A lot of enterprise data is stored in relational databases and accessed via SQL queries. Many web services are little more than HTTP-based wrappers around such queries. Unfortunately, transforming query results to JSON so it can be consumed by a client application often involves numerous inefficient steps, such as binding each row to a data object and loading the entire data set into memory before serializing it back to the caller.

This type of approach has a negative impact on performance and scalabilty.

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Each row requires multiple heap allocations and constructor invocations, increasing latency and CPU load. Worse, the caller does not receive a response until the entire data set has been processed. Further, since each response is loaded entirely into memory, high-volume applications require a large amount of RAM, and can only scale through the addition of more physical hardware.

Eventually, the garbage collector has to run, slowing down the entire system. A much more efficient approach is to stream response data. Instead of copying the query results into an in-memory data structure before sending the response, the web service can write a row of data to the output stream each time a row is read from the result set.

This allows a client to begin receiving the data as soon as it is available, significantly reducing latency. Also, because no intermediate data structures are created, CPU and memory load is reduced, allowing each server to handle a higher number of concurrent requests.

Finally, because fewer heap allocations are required, the garbage collector needs to run much less frequently, resulting in fewer system pauses. It allows developers to create and access web services using a convenient, RPC-like metaphor while preserving fundamental REST principles such as statelessness and uniform resource access.

Arguments are provided either via the query string or in the request body, like an HTML form. Results are generally returned as JSON, although operations that do not return a value are also supported. For example, the following request might retrieve the sum of two numbers, whose values are specified by the a and b query arguments:. Service operations are defined by adding public methods to a concrete service implementation. The RPC annotation is used to flag a method as remotely accessible.

This annotation associates an HTTP verb and a resource path with the method. All public annotated methods automatically become available for remote execution when the service is published. For example, the following class might be used to implement the simple addition operation discussed in the previous section:.

They may be used with any request type, but elements must be a supported simple type; e.

how to retrieve data from database in json format using java

Methods may return any numeric or boolean type, CharSequencejava.MySQL 5. Normalization is a technique used to optimize the database structure. If you have clear relational data requirements, use appropriate single-value fields. JSON should be used sparingly as a last resort. JSON value fields cannot be indexed, so avoid using it on columns which are updated or searched regularly. In addition, fewer client applications support JSON, and the technology is newer and possibly less stable than other types.

Consider a shop selling books. A book table will have an ID, ISBNtitle, publisher, number of pages and other relational data which applies to all books. Presume we want to add any number of category tags to any book. We could achieve this in SQL using:. Note that JSON columns cannot have a default value, be used as a primary key, be referenced as a foreign key or have an index. For example, our book tags can be passed as an array:. It returns 1 when a match is found, e.

It is passed the JSON document being searched, 'one' to find the first match or 'all' to find all matches, and a search string, e. A JSON path targets values and can be used to extract or modify parts of a document. For a more complex example, presume we have a user table with JSON profile data, e. These include:.JSON JavaScript Object Notation is a lightweight, text-based, language-independent data exchange format that is easy for humans and machines to read and write.

JSON can represent two structured types: objects and arrays. An array is an ordered sequence of zero or more values. The values can be strings, numbers, booleans, null, and these two structured types. Below is a simple example from Wikipedia that shows JSON representation of an object that describes a person. Getting Started : You need to download the json-simple Hence in our output file, order is not preserved.

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See your article appearing on the GeeksforGeeks main page and help other Geeks. Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above. Writing code in comment? Please use ide. How to set Precision for Double values in Java? Improved By : ankitjainst. Load Comments.

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FileNotFoundException; import java. PrintWriter; import java. LinkedHashMap; import java. Map; import org. JSONArray; import org. FileReader; import java. Iterator; import java. JSONObject; import org.Post a Comment. Wednesday, 20 February I created a person table here that contains the name, skill, and age of the three information.

How to read JSON data in Spring Boot and write to a database

I have saved two dumping data in this table that are retrieved in JSON format, copy-paste the following data into the table. Last see simply search for call buttons. When you select any person and click this button, the full data display in the table format will be selected using the Ajax process.

See below simple table creating by plugin bootstrap and we set up and display person data in this table. See the second division tag holding the value of two data attributes. When you have select any person name and press on the search button then ajax function has occurred, send your request to 'getData. We assign the JSON object to retrieve able table records in else condition.

The name, skill, and age are JSON objects. Unless you don't import the integrated object from JSON, it won't work.

No comments:. Newer Post Older Post Home. Subscribe to: Post Comments Atom. Now next in this web PHP makes it easy t Our website registered user save own records in Welcome back friends, this is my continuing post from the previous tutorial, well the previous tutorial we build Login and Register proj Popular Posts. The JSP is Hi, if you want to manage different role based users are login access in the single login form and go to own account.

JSON with Java

This tutorial hel Three select options Toggle switc Meet Me On Social.Simplify data security, automation, server-to-server file transfers, and more. Strong encryption and authentication technology for critical file transfers. Asymmetric cryptology for protecting confidential files at rest and in motion.

Simple and secure interfaces for user-to-user file sharing and collaboration. Build automated workflows to move files effortlessly between internal systems, users, and trading partners. Reverse and forward proxy solution for keeping sensitive files out of the DMZ. Explore how GoAnywhere MFTaaS gives you the power to securely transfer files while we take care of setup, hosting, and management. Those RowSets can then be used to insert the data into a database or translate the data to another file type such as XML, Excel, fixed-width, or CSV with no coding required.

Start a free trial and test it out for 30 days. JSON is represented in a logical, organized, and easy-to-access manner. For example, you could have a JSON file that contains customer information along with a list of the products the customer ordered. The customer information can be parsed into one RowSet and the list of products into another RowSet. The following image represents a simple JSON input file and will be referred to throughout this tutorial:.

To begin, create a new Project following the Getting Started with Projects tutorial. On the RowSet element, specify a value for the Variable Name attribute. Click the Add button and select Column.

On the Column element, specify values for the Index and Value attributes. Click the Add button in the sub-menu and select Add Same. Repeat the last two steps to add additional columns and elements from the JSON file. Are you trying to convert JSON data to other data formats?

How to Query a Database and Write the Data to JSON

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how to retrieve data from database in json format using java

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