java連線oracle執行sql語句

一個簡單的示例

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
 
public class OracleJdbcExample {
    public static void main(String[] args) {
        // Oracle資料庫的JDBC URL，使用者名稱和密碼
        String url = "jdbc:oracle:thin:@localhost:1521:orcl";
        String username = "your_username";
        String password = "your_password";
 
        Connection conn = null;
        Statement stmt = null;
 
        try {
            // 載入Oracle JDBC驅動程式
            Class.forName("oracle.jdbc.driver.OracleDriver");
 
            // 建立連線
            conn = DriverManager.getConnection(url, username, password);
 
            // 建立Statement物件來執行SQL語句
            stmt = conn.createStatement();
 
            // 執行SQL查詢並獲取結果
            String sql = "SELECT * FROM your_table";
            ResultSet rs = stmt.executeQuery(sql);
 
            // 處理結果
            while (rs.next()) {
                // 根據你的表結構獲取資料
                int id = rs.getInt("id");
                String name = rs.getString("name");
                // ... 其他欄位
                System.out.println("ID: " + id + ", Name: " + name);
            }
 
            // 關閉結果集
            rs.close();
 
            // 執行更新操作
            String updateSql = "UPDATE your_table SET column_name = 'value' WHERE condition";
            int affectedRows = stmt.executeUpdate(updateSql);
            System.out.println("Affected Rows: " + affectedRows);
        } catch (ClassNotFoundException | SQLException e) {
            e.printStackTrace();
        } finally {
            // 關閉Statement和Connection
            try {
                if (stmt != null) stmt.close();
                if (conn != null) conn.close();
            } catch (SQLException se) {
                se.printStackTrace();
            }
        }
    }
}