要使用Maven实现数据库增删改查功能，您需要在Maven项目中添加数据库驱动依赖，然后编写数据库操作的代码。以下是一个简单的示例：

1、添加mysql数据库驱动依赖到pom.xml文件中：

<dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>8.0.26</version></dependency>

2、编写数据库操作的Java代码：

import java.sql.Connection;import java.sql.DriverManager;import java.sql.PreparedStatement;import java.sql.ResultSet;import java.sql.SQLException;public class DatabaseOperations {private static final String URL = "jdbc:mysql://localhost:3306/mydatabase";private static final String USER = "username";private static final String PASSWORD = "password";public void insertData(String name, String email) {try (Connection conn = DriverManager.getConnection(URL, USER, PASSWORD)) {String sql = "INSERT INTO users (name, email) VALUES (?, ?)";try (PreparedStatement stmt = conn.prepareStatement(sql)) {stmt.setString(1, name);stmt.setString(2, email);stmt.executeUpdate();}} catch (SQLException e) {e.printStackTrace();}}public void updateData(int id, String email) {try (Connection conn = DriverManager.getConnection(URL, USER, PASSWORD)) {String sql = "UPDATE users SET email = ? WHERE id = ?";try (PreparedStatement stmt = conn.prepareStatement(sql)) {stmt.setString(1, email);stmt.setInt(2, id);stmt.executeUpdate();}} catch (SQLException e) {e.printStackTrace();}}public void deleteData(int id) {try (Connection conn = DriverManager.getConnection(URL, USER, PASSWORD)) {String sql = "DELETE FROM users WHERE id = ?";try (PreparedStatement stmt = conn.prepareStatement(sql)) {stmt.setInt(1, id);stmt.executeUpdate();}} catch (SQLException e) {e.printStackTrace();}}public void queryData() {try (Connection conn = DriverManager.getConnection(URL, USER, PASSWORD)) {String sql = "SELECT * FROM users";try (PreparedStatement stmt = conn.prepareStatement(sql); ResultSet rs = stmt.executeQuery()) {while (rs.next()) {int id = rs.getInt("id");String name = rs.getString("name");String email = rs.getString("email");System.out.println("ID: " + id + ", Name: " + name + ", Email: " + email);}}} catch (SQLException e) {e.printStackTrace();}}public static void main(String[] args) {DatabaseOperations db = new DatabaseOperations();db.insertData("Alice", "alice@example.com");db.updateData(1, "alice.new@example.com");db.deleteData(1);db.queryData();}}

这个示例代码演示了如何使用Maven项目实现数据库的增删改查功能。您需要根据自己的数据库连接信息修改URL、USER和PASSWORD参数，然后通过调用不同的方法实现相应的数据库操作。在main方法中，我们创建了DatabaseOperations对象并调用了insertData、updateData、deleteData和queryData方法来执行相应的数据库操作。