使用应用程序接口访问openGauss-JDBC

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class OpenGaussJdbcExample {
    private static final String JDBC_DRIVER = "com.opengauss.jdbc.Driver";
    private static final String CONNECTION_URL = "jdbc:opengauss://localhost:54321/exampledb";
    private static final String USER = "exampleuser";
    private static final String PASSWORD = "examplepassword";

    public static void main(String[] args) {
        Connection conn = null;
        Statement stmt = null;
        try {
            // 注册JDBC驱动
            Class.forName(JDBC_DRIVER);

            // 打开连接
            conn = DriverManager.getConnection(CONNECTION_URL, USER, PASSWORD);

            // 执行查询
            stmt = conn.createStatement();
            String sql = "SELECT * FROM some_table";
            ResultSet rs = stmt.executeQuery(sql);

            // 从结果集中提取数据
            while (rs.next()) {
                // 根据列名或列编号获取数据
                int id = rs.getInt("id");
                String name = rs.getString("name");
                // ... 其他数据处理
            }
            // 关闭结果集
            rs.close();

            // 执行更新操作
            // String updateSql = "UPDATE some_table SET ...";
            // int affectedRows = stmt.executeUpdate(updateSql);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            // 关闭资源
            try {
                if (stmt != null) stmt.close();
            } catch (SQLException se2) {
                se2.printStackTrace();
            }
            try {
                if (conn != null) conn.close();
            } catch (SQLException se) {
                se.printStackTrace();
            }
        }
    }
}