MybatisPlus使用queryWrapper如何实现复杂查询

//    mp实现负责查询操作
    @Test
    public void testSelectQuery(){
        //1,创建QueryWrapper对象
        QueryWrapper<User> wrapper = new QueryWrapper<>();
//        2，通过QueryWrapper设置条件
//        ge大于等于  gt大于  le小于等于 lt   eq等于  ne不等于  between  like模糊查询
//        orderByDesc   last拼接
//        查询age>=30的记录 第一个参数 字段的名字，第二个参数设置值
        wrapper.ge("age",30);
        List<User> users = userMapper.selectList(wrapper);
        System.out.println(users);
//        eq
        wrapper.eq("name","Tian");
        List<User> users1 = userMapper.selectList(wrapper);
        System.out.println(users1);
        wrapper.ne("name","Tian");
        List<User> users2 = userMapper.selectList(wrapper);
        System.out.println(users2);
//        between
//        查询年龄20-30
        wrapper.between("age",20,30);
        List<User> users3 = userMapper.selectList(wrapper);
        System.out.println(users3);
//        like
        wrapper.like("Tian","T");
        List<User> users4 = userMapper.selectList(wrapper);
        System.out.println(users4);
//        orderByDesc
        wrapper.orderByAsc("age");
        List<User> users5 = userMapper.selectList(wrapper);
        System.out.println(users5);
//        last 拼接
        wrapper.last("limit 1");
        List<User> users6 = userMapper.selectList(wrapper);
        System.out.println(users6);
//        指定要查询的列
        QueryWrapper<User> select = wrapper.select("id", "name");
    }

package com.maoyan.quickdevelop.common.core.domain;
import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
import com.fasterxml.jackson.annotation.JSONFORMat;
import com.maoyan.quickdevelop.common.core.domain.dqabstract.DqStatusDispose;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import javax.validation.constraints.Email;
import javax.validation.constraints.Size;
import java.io.Serializable;
import java.util.Date;

@Data
@NoArgsConstructor
@AllArgsConstructor
@TableName(value = "dq_user")
public class DqUser extends DqStatusDispose implements Serializable {
    private static final long serialVersionUID = 1L;
    
    
    @TableId(value = "user_id")
    private Long userId;
    
    @TableField(value = "user_name")
    private String userName;
    
    @TableField(value = "nick_name")
    private String nickName;
    
    @Email(message = "邮箱格式不正确")
    @TableField(value = "email")
    private String email;
    
    @Size(min = 0, max = 11, message = "手机号码长度不能超过11个字符")
    @TableField(value = "phone_number")
    private String phonenumber;
    
    @TableField(value = "sex")
    private String sex;
    
    @TableField(value = "avatar")
    private String avatar;
    
    @TableField(value = "passWord")
    private String password;
    
    @TableField(value = "status")
    private String status;
    
    @TableField(value = "delFlag")
    private String delFlag;
    
    @TableField(value = "loginIp")
    private String loginIp;
    
    @TableField(value = "loginDate")
    private Date loginDate;
    
    @TableField(value = "role")
    private String role;
    
    @TableField(value = "signature")
    private String signature;
    
    @jsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")
    private Date createTime;
    
    @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")
    private Date updateTime;
}

    
    public QueryWrapper<T> myAllEq(T object) throws IllegalAccessException,
            NoSuchMethodException,
            InvocationTargetException {
        String getMethodName = "";
        Field field = null;
        Class<?> aClass = object.getClass();
        Field[] declaredFields = aClass.getDeclaredFields();
//        QueryWrapper<T> queryWrapper = new QueryWrapper<>();
        //第一个为serialVersionUID(舍去) i为1 绕过
        //获取object的所有字段
        for (int i = 1; i < declaredFields.length; i++) {
            field = declaredFields[i];
            //类中的成员变量为private,故必须进行此操
            field.setAccessible(true);
//            不能直接获取到值，可以通过构造get方法，或者调用类的get方法来获取值
//            通过StringUtils的containsIgnoreCase方法来获取方法名称
//            通过上面那种方法，有循环嵌套，性能需要优化
//            所以采取拼接get方法名

//获取get方法名称
            getMethodName = "get" + declaredFields[i].getName().substring(0, 1).toUpperCase() + declaredFields[i].getName().substring(1);
            System.out.println(getMethodName);
//            执行get方法获取属性值
            //执行方法
            Method method = aClass.getMethod(getMethodName, null);
            Object getValue = method.invoke(object, null);
            //System.out.println("输出为："+invoke);
//            System.out.println("优化："+"get"+declaredFields[i].getName().substring(0,1).toUpperCase()+declaredFields[i].getName().substring(1));
//            如果值不为空，则添加到eq中
            if (getValue != null) {
                //映射关系
//                return super.eq(,field.get(object));
                //获取其注解的值
//                后面可以采用查询方法注释来解决，不同的查询所需的问题
                System.out.println("表的值：" + field.getAnnotation(TableField.class).value());
                System.out.println("get获取值：" + getValue.toString());
                MyQueryWrapper.this.eq(field.getAnnotation(TableField.class).value(), getValue.toString());
            }
        }
        return MyQueryWrapper.this;
    }

        //获取所有的方法名称
        //但是顺序是与类中的一样，所以可以构建get方法
        //属性名称第一个大写，然后加上get就是，get方法名称
        Method[] methods = aClass.getMethods();
        for (Method method:
             methods) {
            System.out.println(method.getName());
            if (StringUtils.containsIgnoreCase(method.getName(),"get")&&
                    StringUtils.containsIgnoreCase(method.getName(),"username")){
                System.out.println("值为："+method.getName());
            }
        }