Apache Derby database engine and embedded JDBC drive technical principles
Apache Derby is a memory -based database management system (RDBMS) written by Java.It can provide high -efficiency and reliability for storing and managing data.Derby is an open source project that is maintained and developed by Apache Software Foundation (ASF).The embedded JDBC driver is a Java library provided by the Derby database to interact with the Derby database.
Technical principle:
1. Derby database engine: Derby database engine is the core component of the Derby database. It is responsible for data storage, indexing, transaction management, and query.Derby uses a multi -layer architecture based on Apache Harmony, which realizes ACID (atomic, consistency, isolation and persistence) to ensure the integrity and reliability of data.Derby also supports standard SQL syntax and relational database operations, including creating tables, insert data, query, update, and deletion.
2. Dead of JDBC driver: Derby provides an embedded JDBC driver. It is a pure Java library to interact with the Derby database in the application.The JDBC driver is connected to the Derby database through the Java application and executes related SQL statements and operations.Compared with the traditional client-server mode, the embedded JDBC driver allows applications to directly access the Derby database in the same JVM, reducing network overhead and improving performance.
The example code of the use JDBC driver Derby database is as follows:
import java.sql.*;
public class DerbyExample {
public static void main(String[] args) {
try {
// Connect to Derby database
Class.forName("org.apache.derby.jdbc.EmbeddedDriver");
Connection connection = DriverManager.getConnection("jdbc:derby:myDB;create=true");
// Create a table
Statement statement = connection.createStatement();
statement.execute("CREATE TABLE Customer (id INT, name VARCHAR(100))");
// Insert data
statement.executeUpdate("INSERT INTO Customer VALUES (1, 'John')");
statement.executeUpdate("INSERT INTO Customer VALUES (2, 'Jane')");
// Query data
ResultSet resultSet = statement.executeQuery("SELECT * FROM Customer");
while (resultSet.next()) {
int id = resultSet.getInt("id");
String name = resultSet.getString("name");
System.out.println("ID: " + id + ", Name: " + name);
}
// Turn off the connection
connection.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
The above code first loads the Derby embedded driver, and then connects to the Derby database with the method of `DriverManager.getConnection ()`.Next, by creating and executing the SQL statement, we created a table called Customer and inserted two records.Finally, we execute the Select statement to query and output the results.Finally, turn off the connection to the database by calling the method by calling `Connection.close ()`.
Summarize:
The technical principles of Apache Derby database engine and embedded JDBC drive are the key to achieving efficient and reliable data storage and management.By understanding Derby's architecture and using an example code that uses the embedded JDBC driver to interact with Derby database, developers can better use these two technologies to build a powerful Java application and manage databases.
