File Name: javafx application and database operations .zip
- Tools and Technologies used
- Java JDBC CRUD Tutorial: SQL Insert, Select, Update, and Delete Examples
- 20 JavaFX real-world applications
Our JavaFX tutorial is designed for beginners and professionals.
These Modules are part of the Standard subset. For further information on the Standard subset, see chapter "Use the Standard subset". Specify the path of the application to be opened via the parameter Path. Optionally, you can specify a working directory via the parameter Directory. The parameter Arguments allows you to transfer arguments to the application in separate XTestStepValues.
Tools and Technologies used
The examples were created and tested on Ubuntu Linux. It provides methods for querying and updating data in a database. JDBC is oriented towards relational databases. From a technical point of view, the API is as a set of classes in the java.
JDBC is a cornerstone for database programming in Java. Today, it is considered to be very low-level and prone to errors. However, under the hood, these solutions still use JDBC. A database connection is defined with a connection string.
It contains information such as database type, database name, server name, and port number. Each database has its own connection string format. It is possible to specify multiple hosts for a server failover setup. The items in square brackets are optional. If no host is specified, the host name defaults to localhost. If the port for a host is not specified, it defaults to , the default port number for MySQL servers.
This is an example of a MySQL connection string. We connect to the localhost on MySQL standard port The database name is testdb. MySQL is a leading open source database management system. It is a multi user, multithreaded database management system. MySQL is especially popular on the web.
These sites manage millions of queries each day. In this section, we are going to install MySQL server, create a testdb database, and a test user. This command installs the MySQL server and various other packages. While installing the package, we are prompted to enter a password for the MySQL root account. Next, we are going to create a new database user and a new database. We use the mysql client.
We check if the MySQL server is running. If not, we need to start the server. On Ubuntu Linux, this can be done with the sudo service mysql start command. We use the mysql monitor client application to connect to the server.
We connect to the database using the root account. We create a new testdb database. We will use this database throughout the tutorial. We create a new database user. We grant all privileges to this user for all tables of the testdb database.
We also include the exec-maven-plugin for executing Java programs from Maven. If the following program runs OK, then we have everything installed OK. We check the version of the MySQL server. Each driver has a different syntax for the URL. In our case, we provide a host, a port, and a database name. We establish a connection to the database, using the connection URL, user name, and password. The connection is established with the getConnection method. The createStatement method of the connection object creates a Statement object for sending SQL statements to the database.
The executeQuery method of the connection object executes the given SQL statement, which returns a single ResultSet object. The try-with-resources syntax ensures that the resources are cleaned up in the end. A ResultSet object maintains a cursor pointing to its current row of data.
Initially the cursor is positioned before the first row. The next method moves the cursor to the next row. If there are no rows left, the method returns false. The getString method retrieves the value of a specified column.
The first column has index 1. In case of an exception, we log the error message. For this console example, the message is displayed in the terminal. We run the program from the command line. The Manen's -q option runs Maven in quiet mode; i.
Next we are going to create database tables and fill them with data. These tables will be used throughout this tutorial. The tables are of InnoDB type. InnoDB databases support foreign key constraints and transactions. We place a foreign key constraint on the AuthorId column of the Books table. We fill the Authors and Books tables with initial data. Now we will concern ourselves with prepared statements. When we write prepared statements, we use placeholders instead of directly writing the values into the statements.
Prepared statements increase security and performance. Here we create a prepared statement. Prepared statements are faster and guard against SQL injection attacks. The prepared statement is executed. We use the executeUpdate method of the statement object when we don't expect any data to be returned. For the following two examples, we will use the Testing table. We will execute a normal statement and a prepared statement times. We check if there is some difference in execution time. Next we will show how to retrieve data from a database table.
We get all data from the Authors table. We execute a query that selects all columns from the Authors table. We use the executeQuery method. The next method advances the cursor to the next record. It returns false when there are no more rows in the result set. The getInt and getString methods retrieve the value of the designated column in the current row of this ResultSet object as an int and String of the Java programming language.
It is a common practice to put the configuration data outside the program in a separate file. This way the programmers are more flexible. We can change the user, a password or a connection url without needing to recompile the program. It is especially useful in a dynamic environment, where is a need for a lot of testing, debugging, securing data etc.
In Java, the Properties is a class used often for this. We have a db. These are dynamically loaded during the execution of the program. We connect to the testdb database and print the contents of the Authors table to the console. This time, we load the connection properties from a file. They are not hard coded in the proram. The Properties class is created. The data is loaded from the file called db.
In this example, we connect to the database using a data source. The usage of a data source improves application's performance and scalability. Using a datasource has several advantages over the DriverManager : increased portability, connection pooling, and distributed transactions. It is possible to execute multiple SQL statements in one query. In the code example, we retrieve three rows from the Authors table. We enable multiple statements queries in the database URL by setting the allowMultiQueries parameter to true.
We call the execute method of the prepared statement object. The method returns a boolean value indicating if the first result is a ResultSet object. Subsequent results are called using the getMoreResults method.
Java JDBC CRUD Tutorial: SQL Insert, Select, Update, and Delete Examples
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Although the target database system is Oracle Database, but the same techniques can be applied to other database systems as well because of the query syntax used is standard SQL is generally supported by all relational database systems. You need to go through this article article before continuing for better understanding. They are all available under the java. The Oracle Database server listens on the default port at localhost. The following code snippet connects to the database name userid by the user login1 and password pwd1. For Oracle database 11g it is orcl and for oracle database 10g it is xe. Note : Here the column index here is 1-based, the first column will be at index 1, the second at index 2, and so on.
high-level steps to create and deploy a JavaFX application. RIGHTS Programs, software, databases, and related documentation and technical data create, test, debug, and deploy rich client applications that operate consistently across.
20 JavaFX real-world applications
The examples were created and tested on Ubuntu Linux. It provides methods for querying and updating data in a database. JDBC is oriented towards relational databases.
Once a connection is made, you can begin working with the database in the IDE, allowing you to create tables, populate them with data, run SQL statements and queries, and more. Therefore, you can skip ahead to Starting the Server and Creating a Database. If the Database Location field is empty you will need to set the path to the directory that contains your databases.
Closing JavaFX applications
This article essentially shows how this may be done with an example scenario. JavaFX supplies a large array or controls and components that help in building a GUI interface quickly and effectively. It is very easy to develop a desktop application that interacts with the back-end database. Java code is written to fetch records from one or more tables in the database. The JDBC driver acts as an intermediary between the Java program and the database and interprets the volley of information to and fro, so that both the unmatched party, such as the database, and the Java program can reconcile to a workable solution. The database has absolutely no idea about Java code, its syntaxes, or anything about it. It simply understands SQL and can communicate with it only.