To understand the above-mentioned concepts related to DBUtils, let us write an example which will run a read query. If everything is fine with your application, it will print the following message.
This class supports same methods as QueryRunner but it return Callable objects which can be used later to retrieve the result. Following example will demonstrate how to update a record using AsyncQueryRunner class.
We'll update one of the available record in employee Table. To understand the above-mentioned concepts related to DBUtils, let us write an example which will run an update query in async mode.
ResultSetHandler interface is responsible to convert ResultSets into objects. Following example will demonstrate how to map a record using ResultSetHandler class. We'll read one of the available record in Employee Table.
Following example will demonstrate how to read a record using BeanHandler class. We'll read one of the available record in Employees Table and map it to Employee bean. Following example will demonstrate how to read a list of records using BeanListHandler class. We'll read available records in Employees Table and map them to list of Employee beans. Following example will demonstrate how to read a list of records using ArrayListHandler class. We'll read available records in Employees Table as object[].
Following example will demonstrate how to read a list of records using MapListHandler class. We'll read available records in Employees Table as list of maps. We can create our own custom handler by implementing ResultSetHandler interface or by extending any of the existing implementation of ResultSetHandler.
In case column names in a database table and equivalent javabean object names are not similar then we can map them by using customized BasicRowProcessor object. See the example below. So far, we've using connection object while using QueryRunner. We can also use datasource seemlessly. The following example will demonstrate how to read a record using Read query with the help of QueryRunner and datasource.
We'll read a record from Employees Table. Previous Page. Next Page. Scope of the Package DbUtils is designed to be: Small - you should be able to understand the whole package in a short amount of time.
Transparent - DbUtils doesn't do any magic behind the scenes. You give it a query, it executes it and cleans up for you. Fast - You don't need to create a million temporary objects to work with DbUtils. An object oriented abstraction of general database objects like a Table, Column, or PrimaryKey. A heavyweight framework of any kind - the goal here is to be a straightforward and easy to use JDBC helper library.
Example Usage Please see Examples Page. JDBC drivers are also included as a part of the installation. So, you should not worry about this part. For this tutorial we are going to use MySQL database. When you install any of the above database, its administrator ID is set to root and gives provision to set a password of your choice. There are various database operations like database creation and deletion, which would need administrator ID and password.
If you do not have sufficient privilege to create new users, then you can ask your Database Administrator DBA to create a user ID and password for you. Note: The path to mysqld.
You can also check documentation on how to start and stop your database server. At the time of writing this tutorial, we have downloaded commons-dbutils
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