基于Java+SSM+Mysql+Maven+HTML实现的员工绩效管理系统设计与实现

由于这个查询涉及到的内容较多，我将给出核心的数据库连接和查询代码示例。

// 导入所需的类库
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.ModelAndView;
import java.util.List;
import java.util.Map;
import javax.annotation.Resource;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.mysql.jdbc.Connection;
import com.mysql.jdbc.PreparedStatement;
import com.mysql.jdbc.ResultSet;
 
@Controller
public class PerformanceController {
 
    // 查询员工绩效信息
    @RequestMapping(value = "/getPerformance", method = RequestMethod.GET)
    public @ResponseBody String getPerformance(HttpServletRequest request) {
        String empId = request.getParameter("empId");
        String sql = "SELECT * FROM performance WHERE emp_id = ?";
 
        try (
                Connection conn = getConnection();
                PreparedStatement pstmt = (PreparedStatement) conn.prepareStatement(sql);
        ) {
            pstmt.setString(1, empId);
            ResultSet rs = pstmt.executeQuery();
 
            List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();
            while (rs.next()) {
                Map<String, Object> map = new HashMap<String, Object>();
                map.put("id", rs.getInt("id"));
                map.put("empId", rs.getString("emp_id"));
                map.put("kpi", rs.getString("kpi"));
                map.put("kra", rs.getString("kra"));
                map.put("weight", rs.getInt("weight"));
                map.put("score", rs.getInt("score"));
                list.add(map);
            }
            return JSON.toJSONString(list);
        } catch (Exception e) {
            e.printStackTrace();
            return "{\"error\":\"" + e.getMessage() + "\"}";
        }
    }
 
    // 获取数据库连接
    private Connection getConnection() throws Exception {
        Class.forName("com.mysql.jdbc.Driver");
        String url = "jdbc:mysql://localhost:3306/your_database_name";
        String username = "your_username";
        String password