![]() ![]() I hope this Java MySQL UPDATE example (using a Java PreparedStatement) makes sense. One way to confirm that our data was successfully updated in our MySQL database.How to close the MySQL database connection.How to execute the Java PreparedStatement. ![]() How to set the field values for a PreparedStatement.How to write a MySQL UPDATE query for use with a PreparedStatement.In "real world" Java database programs I almost always use the Spring JDBC libraries to access a database, but when you're first getting started, or working on small programs, I think it's important to see examples like this so you can understand how things work under the covers. Java MySQL UPDATE example using PreparedStatement - summary | id | first_name | last_name | date_created | is_admin | num_points | Where you will see some output like this: Java MySQL UPDATE example - resultsĪfter this Java MySQL UPDATE query runs, you can verify that it worked by looking at the data from the MySQL command prompt, running a SELECT query like this: Update users set num_points = 6000 where id = 2 īut because this is a sample program, I decided to show the query this way. Specifically, in this example, you'd probably already know the "id" for the user Fred, and when you go to update Fred's data, you would normally do it like this: Typically in a database program like this you'll end up updating rows based on the primary key of the database table. Note that this SQL UPDATE query is a little unusual, but not totally uncommon. PreparedStatement preparedStmt = conn.prepareStatement(query) String query = "update users set num_points = ? where first_name = ?" create the java mysql update preparedstatement String myUrl = "jdbc:mysql://localhost/test" Ĭonnection conn = DriverManager.getConnection(myUrl, "root", "") create a java mysql database connection Public class JavaMysqlPreparedStatementUpdateExample * MySQL database, called from a Java program. * Demonstrates the use of a SQL UPDATE statement against a Note that in this example my MySQL database username is "root", my password is blank, and the MySQL database is running on the same computer where this program is run, so the database host name is "localhost". I've tried to document the following Java MySQL UPDATE example so you can see these steps. Catch any exceptions that may come up during the process.Set the fields on our Java PreparedStatement object.Create a SQL UPDATE statement, using the Java PreparedStatement syntax.Create a Java Connection to our MySQL database.To do so, we just need to follow these steps: Given that MySQL database table design, let's assume that we just want to update one record in this table. A Java MySQL UPDATE PreparedStatement example Other than that, this MySQL database table is relatively normal, though it is greatly simplified. In particular, the field num_points is a little unusual, but I made it up so I could show an int data type in this table, and I was thinking of those websites where points are awarded for giving correct answers. Insert into users (first_name, last_name) values ('Barney', 'Rubble') Ī few of these fields are a little contrived, but I wanted to show several different data types in one table, so this is what I came up with. Insert into users (first_name, last_name) values ('Fred', 'Flinstone') To keep it simple - but also show several different data types - I've created the following MySQL database table: The first thing we need for our Java UPDATE example is a sample MySQL database table. I just worked up a Java MySQL UPDATE example, using the Java PreparedStatement class, and a sample MySQL database table we can work with. Java MySQL FAQ: Can you share an example of a Java MySQL UPDATE example (using a Java PreparedStatement object)?
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