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This article mainly explains the "methods and steps of using JDBC to connect to the database". The content of the explanation in the article is simple and clear, and it is easy to learn and understand. Please follow the editor's way of thinking to study and learn "the methods and steps of using JDBC to connect to the database".

Introduction to JDBC

The full name of JDBC is: JavaDataBaseConnectivity (java Database connection), which can provide uniform access to a variety of databases. JDBC is a set of database access programming interface developed by sun and a kind of SQL-level API. It is written by java language, so it has good cross-platform characteristics. Database applications written with JDBC can run on any platform that supports java, without having to write different applications on different platforms.

The main functions of JDBC are as follows:

(1) establish a link to a database or other data source

(2) send SQL commands to the database

(3) processing the returned results of the database

Common classes and interfaces in JDBC

Connect to the database (Connection), create operation instructions (Statement), execute query instructions (executeQuery), obtain query results (ResultSet), etc.

Driver Management Class (DriverManager)

The DriverManager class is the management class of JDBC that acts between the user and the driver. It tracks the available drivers and establishes a connection between the database and the corresponding drivers. In addition, the driver Manager class also handles display transactions such as driver login time limits and login and tracking messages. For simple applications, the average programmer needs to use the only method directly in this class when DriverManager.getConnection (). This method establishes a link to the database. JDBC allows users to call DriverManager methods getDriver (), getDrivers () and registerDriver () and Driver methods connect ().

Declaration class (Statement)

The Statement object is used to send SQL statements to the database. There are actually three kinds of Statement objects that act as package containers for executing SQL statements on a given link: Statement, PreparedStatement (which inherits from Statement), and CallableStatement (which inherits from PreparedStatement). They are all designed to send specific types of SQL statements:

(1) the Statement object is used to execute simple SQL statements without parameters; the Statement interface provides basic methods for executing statements and getting results.

(2) PerparedStatement object is used to execute precompiled SQL statements with or without IN parameters; PeraredStatement API adds methods to handle IN parameters

(3) the CallableStatement object is used to perform calls to stored procedures in the database; CallableStatement adds methods to handle OUT parameters.

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