java获取mysql数据库主键

import java.sql.*;

public class GetPrimaryKey {
    public static void main(String[] args) {
        Connection connection = null;
        PreparedStatement preparedStatement = null;
        ResultSet resultSet = null;
        try {
            // 1. 加载数据库驱动
            Class.forName("com.mysql.cj.jdbc.Driver");
            
            // 2. 建立数据库连接
            String url = "jdbc:mysql://localhost:3306/mydatabase";
            String username = "your_username";
            String password = "your_password";
            connection = DriverManager.getConnection(url, username, password);
            
            // 3. 准备SQL语句
            String sql = "SELECT COLUMN_NAME FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA = ? AND TABLE_NAME = ? AND COLUMN_KEY = 'PRI'";
            
            // 4. 执行SQL语句
            preparedStatement = connection.prepareStatement(sql);
            preparedStatement.setString(1, "mydatabase"); // 替换为你的数据库名
            preparedStatement.setString(2, "mytable"); // 替换为你的表名
            resultSet = preparedStatement.executeQuery();
            
            // 5. 处理结果集
            while (resultSet.next()) {
                String primaryKey = resultSet.getString("COLUMN_NAME");
                System.out.println("Primary key: " + primaryKey);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            // 6. 关闭资源
            try {
                if (resultSet != null) resultSet.close();
                if (preparedStatement != null) preparedStatement.close();
                if (connection != null) connection.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
}

import org.hibernate.annotations.GenericGenerator;
import javax.persistence.*;

@Entity
@Table(name = "mytable")
public class MyEntity {
    @Id
    @GeneratedValue(generator = "uuid")
    @GenericGenerator(name = "uuid", strategy = "org.hibernate.id.UUIDGenerator")
    private String id;
    
    // 其他属性和方法
}