用java语言，访问SQLServer或者MySQL数据库，使用 JDBC API构建应用程序，对学生信息表（student）执行以下各种数据库操作：查询表、在表中插入行、在表中更新行、从表中删除行。要求使用PreparedStatement对象查询并修改数据。

好的，这是一个关于Java语言连接SQLServer或MySQL数据库的问题，并对学生信息表执行一些基本的CRUD操作。下面是一个简单的示例代码，演示了如何使用JDBC API连接数据库和执行操作：

import java.sql.*;

public class StudentDatabase {

    // JDBC driver name and database URL
    static final String JDBC_DRIVER = "com.mysql.jdbc.Driver";
    static final String DB_URL = "jdbc:mysql://localhost/STUDENT";

    // Database credentials
    static final String USER = "username";
    static final String PASS = "password";

    public static void main(String[] args) {
        Connection conn = null;
        PreparedStatement stmt = null;

        try {
            // Register JDBC driver
            Class.forName(JDBC_DRIVER);

            // Open a connection
            System.out.println("Connecting to database...");
            conn = DriverManager.getConnection(DB_URL, USER, PASS);

            // Query the student table
            System.out.println("Querying student table...");
            stmt = conn.prepareStatement("SELECT id, name, age FROM student");
            ResultSet rs = stmt.executeQuery();

            // Process the result set
            while (rs.next()) {
                int id = rs.getInt("id");
                String name = rs.getString("name");
                int age = rs.getInt("age");
                System.out.println("ID: " + id + ", Name: " + name + ", Age: " + age);
            }

            // Insert a new student
            System.out.println("Inserting a new student...");
            stmt = conn.prepareStatement("INSERT INTO student (name, age) VALUES (?, ?)");
            stmt.setString(1, "John");
            stmt.setInt(2, 20);
            int rowsInserted = stmt.executeUpdate();
            System.out.println(rowsInserted + " row(s) inserted.");

            // Update a student's age
            System.out.println("Updating a student's age...");
            stmt = conn.prepareStatement("UPDATE student SET age = ? WHERE name = ?");
            stmt.setInt(1, 21);
            stmt.setString(2, "John");
            int rowsUpdated = stmt.executeUpdate();
            System.out.println(rowsUpdated + " row(s) updated.");

            // Delete a student
            System.out.println("Deleting a student...");
            stmt = conn.prepareStatement("DELETE FROM student WHERE name = ?");
            stmt.setString(1, "John");
            int rowsDeleted = stmt.executeUpdate();
            System.out.println(rowsDeleted + " row(s) deleted.");
        } catch (SQLException se) {
            // Handle errors for JDBC
            se.printStackTrace();
        } catch (Exception e) {
            // Handle errors for Class.forName
            e.printStackTrace();
        } finally {
            // Close resources
            try {
                if (stmt != null) stmt.close();
            } catch (SQLException se2) {
            } // nothing we can do
            try {
                if (conn != null) conn.close();
            } catch (SQLException se) {
                se.printStackTrace();
            }
            System.out.println("Goodbye!");
        }
    }
}

这个示例代码使用了MySQL数据库，你需要将代码中的URL、用户名和密码替换成你自己的。另外，你需要将代码中的表名、列名和数据类型替换成你自己的学生信息表的结构。

这个示例代码包含了查询表、插入行、更新行和删除行四种操作，都使用了PreparedStatement对象，可以有效地防止SQL注入攻击。你可以根据自己的需要添加更多的操作。