How to integrate Java I/O streams and database connections?

In Java, I/O streams and database connections are integrated through the following steps: Establishing a database connection Creating a statement object Executing a SQL statement Obtaining a result set Processing data using I/O streams

Java I/O stream and database connection integration

In Java development, it is often necessary to process data from text files or databases. I/O streams and database connections are key technologies to achieve these two functions. This article will explore how to integrate them to read and write data from the database.

Introduction to I/O streams

I/O stream is an abstract class that can read or write data through objects. Java provides two main interfaces, InputStream and OutputStream, which represent input streams and output streams respectively. Specific file I/O operations can be completed through specific implementation classes such as FileReader and FileWriter.

Introduction to database connection

Database connection is the bridge between the application and the database. Java provides a set of APIs through JDBC (Java Database Connectivity) that enable developers to connect with various database systems. Commonly used database connection classes include Connection, Statement and ResultSet.

Integrating I/O streams and database connections

To integrate I/O streams with database connections, you can use the following steps:

1. Establish a database connection: Use the DriverManager class in JDBC to obtain a database connection.
2. Create statement object: Use Connection object to create Statement object, which is used to execute SQL statements.
3. Execute the SQL statement to obtain the result set: Use the Statement object to execute the SQL statement and store the results in the ResultSet object.
4. Use I/O streams to process data: Use ResultSet objects with I/O streams to read data from or write data to the database.

Practical case

The following is a practical case integrating I/O flow and database connection:

import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class FileDBIntegration {

    public static void main(String[] args) {
        // 建立数据库连接
        Connection conn = null;
        Statement stmt = null;
        try {
            conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/database", "user", "password");
            stmt = conn.createStatement();
        } catch (SQLException e) {
            e.printStackTrace();
            return;
        }

        // 读取文件数据
        File file = new File("data.txt");
        try (FileReader reader = new FileReader(file)) {
            int data;
            while ((data = reader.read()) != -1) {
                // 执行SQL语句将数据写入数据库
                String sql = "INSERT INTO table (column) VALUES (" + data + ")";
                stmt.executeUpdate(sql);
            }
        } catch (IOException | SQLException e) {
            e.printStackTrace();
        } finally {
            // 关闭连接和语句对象
            try {
                if (stmt != null) { stmt.close(); }
                if (conn != null) { conn.close(); }
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
}

Conclusion

Through the method introduced in this article, you can integrate I/O streams and database connections to easily read data from text files and write to the database. This integration has a wide range of applications in data processing and file management.

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