![]() ![]() ![]() In order to close the connection on a normal or abnormal exit, use the following pattern: try(Connection con = DriverManager. The above code, however, does not close the connection in case of an exception. ![]() Note that a database connection is a precious resource in a program and must be closed properly as above. String jdbcUrl = "jdbc:mysql://localhost/sample?user=testuser&password=securepwd" Static public void main (String args) throws Exception Using this jdbcUrl, here is a complete program to check connectivity. (Including the password like this is NOT a good practice, see below for alternatives.) Notice that we have included all the parameters required for connection, including the hostname ( localhost), username and password. String jdbcUrl = "jdbc:mysql://localhost/sample?user=testuser&password=secrepwd" I created the database and tables using MySQL Workbench, but now I need my program to work on other computers and therefore I need it to check if the database and tables exist, and if not create them on its own. Ĭonnection con = DriverManager.getConnection(jdbcUrl) Īnd what is the jdbcUrl? It indicates the details of the connection, including the server where the database is located, username and so on. I've created a program in Java for a school project. One way to create a database connection is to use the DriverManager. ![]() Try (Connection connection = DriverManager.Now that we have squared away the details of loading the MySQL driver from java, let us get connecting to the database. String url = "jdbc:mysql://localhost:3306/javabase" Create a simple Java class with a main() method to test the connection. So the final URL should look like: jdbc:mysql://localhost:3306/javabase This is by default 3306.ĭatabasename: The name of the database you'd like to connect to. Port: The TCP/IP port where MySQL server listens on. If you encounter connectivity problems and using 127.0.0.1 instead of localhost solved it, then you've a problem in your network/DNS/hosts config. It can also be an IP address like 127.0.0.1. If it's installed at the same machine where you run the Java code, then you can just use localhost. Hostname: The hostname where MySQL server is installed. To connect the MySQL database using Java you need an JDBC URL in the following syntax: jdbc:mysql://hostname:port/databasename Yes, java is the username and password is the password here.ĭetermine the JDBC URL. GRANT ALL ON javabase.* TO IDENTIFIED BY 'password' Simply because using root is a bad practice. CREATE DATABASE javabase DEFAULT CHARACTER SET utf8 COLLATE utf8_unicode_ci Ĭreate a user for Java and grant it access. You of course want World Domination, so let's use UTF-8 as well. In Unix and clones : should be used.Ĭreate a database in MySQL. is just there to add the current directory to the classpath as well so that it can locate and the is the classpath separator as it is in Windows. If you're doing it "plain vanilla" in the command console, then you need to specify the path to the JAR file in the -cp or -classpath argument when executing your Java application. If you're using an IDE like Eclipse or Netbeans, then you can add it to the classpath by adding the JAR file as Library to the Build Path in project's properties. The vendor-specific JDBC driver is a concrete implementation of the JDBC API ( tutorial here). It's by default 3306.ĭownload the JDBC driver and put in classpath, extract the ZIP file and put the containing JAR file in the classpath. Remember the port number whenever you've changed it. Here's a step by step explanation how to install MySQL and JDBC and how to use it:ĭownload and install the MySQL server. ![]()
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