The technical characteristics of Apache Derby database engine and embedded JDBC drive
The technical characteristics of Apache Derby database engine and embedded JDBC drive
Apache Derby is a powerful and easy -to -use embedded database engine, which also provides support for standard JDBC interfaces.It is written by Java, so it has good cross -platform characteristics and can run on various operating systems.This article will introduce the technical characteristics of the Apache Derby database engine and embedded JDBC drive, and provide some Java code examples.
1. Embedded database engine:
Apache Derby is a database engine that is completely embedded in the application and does not require additional independent server processes.This means that the application can embed the Derby database as a library file or memory database into the application path of the application and access it through the JDBC interface.The advantage of the embedded engine is to simplify the deployment and configuration of the database, and improve the migability of the application.
2. Lightweight and high performance:
Apache Derby is a lightweight database engine with a small storage space occupation.It uses a compact storage format to optimize the query performance and resource utilization rate.Derby provides high -performance data access to support concurrent operation and transaction processing.This makes Derby perform well in various scale applications.
3. Open source and standard JDBC support:
Apache Derby is an open source project, which is very convenient to integrate with other open source projects and tools.It supports standard JDBC interfaces, allowing any development language connection and operation Derby database that supports JDBC.This allows developers to use familiar APIs and tools to build applications and easily switch to other database engines.
4. Memory database support:
Apache Derby provides support for memory databases, and data can be completely stored in memory to obtain the best read and write performance.Memory databases are very useful in applications that require high -speed reading and writing operations, and data durability is not the main focus.Below is an example of Java code using memory database:
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;
public class InMemoryDatabaseExample {
public static void main(String[] args) {
try {
// Connect the memory database
String url = "jdbc:derby:memory:testDB;create=true";
Connection conn = DriverManager.getConnection(url);
// Create a table
Statement stmt = conn.createStatement();
String createTableSql = "CREATE TABLE employees (id INT, name VARCHAR(50))";
stmt.executeUpdate(createTableSql);
// Insert data
String insertSql = "INSERT INTO employees VALUES (1, 'John Doe')";
stmt.executeUpdate(insertSql);
// Query data
String selectSql = "SELECT * FROM employees";
ResultSet rs = stmt.executeQuery(selectSql);
// Print results
while (rs.next()) {
System.out.println("Id: " + rs.getInt("id") + ", Name: " + rs.getString("name"));
}
// Turn off the connection
rs.close();
stmt.close();
conn.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
The above example demonstrates how to connect to the memory database, create tables, insert data, and query the results.
Summarize:
Apache Derby is a powerful and easy -to -use embedded database engine. It has technical characteristics such as lightweight, high -performance, open source and standard JDBC support.Whether it is building a small application or a large enterprise -level application, Derby is a reliable choice.It is hoped that this article will be helpful to understand the technical characteristics of Apache Derby and embedded JDBC drive.
