Analysis of the application principle of HikaricP framework in the Java library
HikaricP is a lightweight, high -performance Java connection pool framework, which is widely used in the Java class library.This article will analyze the application principle of the HikaricP framework in the Java class library.
1. The concept and application of the connection pool
The connection pool is a common database connection management mechanism.In the traditional database connection management method, each time you connect the database, you need to create a new connection object, which will cause frequent operations to create and destroy the connection. Such overhead is very large.The mechanism of the connection pool is to create a certain number of database connections when the application starts and save them in a connection pool. The application can be obtained directly from the connection pool when the database is connected.Reuse in the connection pool.
2. Features of HikaricP framework
HikaricP is a high -performance connection pool framework, which has the following characteristics:
-The quickly start and connect acquisition: HikaricP's start and connection acquisition speed is very fast. It optimizes the performance of connection acquisition by using the thread pool technology in the Java packet packet.
-A resource occupation small: Compared to other connection pool frameworks, HikaricP occupies less memory resources.Its code is small, but it still has high performance and reliability.
-Orior monitoring and management: HikaricP can automatically monitor the state of connection and automatically re -connect.It also provides some configuration parameters that can be customized according to actual needs.
3. The application principle of HikaricP
The application principle of HikaricP can be briefly summarized as the following steps:
-Netalized connection pool: When the application starts, create a connection pool object according to the configuration file, and initialize a certain number of database connections.These connection objects will be preserved in a connection pool.
-Coloning connection: When the application requires the database connection, obtain the connection object directly from the connection pool. If there is no available connection in the connection pool, it will wait until the connection is released.
-Add using connection: The application uses the obtained connection object for database operation.
-Huye connection: After the application is used, the connection object is placed back to the connection pool for other applications.
The following is a sample code fragment that shows how to use HikaricP to connect to the MySQL database:
import com.zaxxer.hikari.HikariConfig;
import com.zaxxer.hikari.HikariDataSource;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public class HikariExample {
public static void main(String[] args) {
HikariConfig config = new HikariConfig();
config.setJdbcUrl("jdbc:mysql://localhost:3306/mydatabase");
config.setUsername("username");
config.setPassword("password");
HikariDataSource dataSource = new HikariDataSource(config);
try (Connection connection = dataSource.getConnection()) {
String sql = "SELECT * FROM users";
try (PreparedStatement statement = connection.prepareStatement(sql);
ResultSet resultSet = statement.executeQuery()) {
while (resultSet.next()) {
System.out.println("User: " + resultSet.getString("username"));
}
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
dataSource.close();
}
}
}
The above code example demonstrates the use of HikaricP to connect to the MySQL database and perform query operations.By configured the connection parameters in the Hikariconfig object, and then use the HikaridataSource object to obtain the connection to perform the database operation.
In summary, the application principle of the HikaricP framework in the Java class library is to provide fast and efficient database connection to obtain and reuse function through the management mechanism and high -performance implementation of the connection pool.Through reasonable configuration and use, it can help improve the performance and reliability of the application.
