(add)[后端](新增多条件、多表关联、动态SQL、分页复杂查询示例)

src/main/java/com/laker/admin/framework/model/PageVO.java

+package com.laker.admin.framework.model;
+
+import cn.hutool.core.collection.CollUtil;
+import cn.hutool.core.util.StrUtil;
+import com.baomidou.mybatisplus.core.metadata.OrderItem;
+import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
+import io.swagger.annotations.ApiModelProperty;
+import lombok.Data;
+
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * 查询参数
+ */
+@Data
+public class PageVO implements Serializable {
+
+    private static final long serialVersionUID = 1L;
+
+    /**
+     * 每页显示条数，默认 10
+     */
+    @ApiModelProperty(value = "每页显示条数，默认 10")
+    private long size = 10;
+    /**
+     * 当前页，默认1，第一页
+     */
+    @ApiModelProperty(value = "当前页，默认1，第一页")
+    private long current = 1;
+
+    /**
+     * 排序字段信息
+     * 排序字段和排序类型
+     * create_time desc,user_no asc.
+     */
+    @ApiModelProperty(value = "排序字段和排序类型，例如：create_time desc,user_no asc.")
+    private String orderBy;
+
+
+    public Page toPage() {
+        Page page = new Page();
+        page.setCurrent(current);
+        page.setSize(size);
+        if (StrUtil.isNotBlank(orderBy)) {
+            List<OrderItem> orders = new ArrayList<>();
+            String[] orderItems = StrUtil.split(orderBy, ",");
+            for (String orderItemStr : orderItems) {
+                String[] orderAndSort = StrUtil.split(orderItemStr, " ");
+                if (CollUtil.size(orderAndSort) != 2) {
+                    continue;
+                }
+                String order = orderAndSort[0];
+                String sort = orderAndSort[1];
+                orders.add(new OrderItem(order, StrUtil.equalsIgnoreCase("ASC", sort)));
+            }
+            page.setOrders(orders);
+        }
+        return page;
+    }
+}

src/main/java/com/laker/admin/module/sys/controller/SysUserController.java

@@ -12,12 +12,14 @@ import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
 import com.laker.admin.config.LakerConfig;
 import com.laker.admin.framework.aop.Metrics;
 import com.laker.admin.framework.model.PageResponse;
+import com.laker.admin.framework.model.PageVO;
 import com.laker.admin.framework.model.Response;
 import com.laker.admin.module.sys.entity.SysRole;
 import com.laker.admin.module.sys.entity.SysUser;
 import com.laker.admin.module.sys.entity.SysUserRole;
 import com.laker.admin.module.sys.pojo.FlowAssigneVo;
 import com.laker.admin.module.sys.pojo.PwdQo;
+import com.laker.admin.module.sys.pojo.UserDto;
 import com.laker.admin.module.sys.service.ISysRoleService;
 import com.laker.admin.module.sys.service.ISysUserRoleService;
 import com.laker.admin.module.sys.service.ISysUserService;
@@ -70,6 +72,14 @@ public class SysUserController {
         return PageResponse.ok(pageList.getRecords(), pageList.getTotal());
     }
 
+    @GetMapping("/pageComplexAll")
+    @ApiOperation(value = "复杂分页查询示例")
+    public PageResponse pageComplexAll(PageVO page, UserDto userDto) {
+        Page roadPage = page.toPage();
+        Page pageList = sysUserService.page(roadPage, userDto.queryWrapper());
+        return PageResponse.ok(pageList.getRecords(), pageList.getTotal());
+    }
+
 
     @GetMapping("/getAll")
     @ApiOperation(value = "获取所有用户")

src/main/java/com/laker/admin/module/sys/pojo/UserDto.java

+package com.laker.admin.module.sys.pojo;
+
+import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
+import io.swagger.annotations.ApiModelProperty;
+import lombok.Data;
+import org.apache.commons.lang.StringUtils;
+
+@Data
+public class UserDto {
+    @ApiModelProperty(value = "用户昵称")
+    private String nickName;
+    @ApiModelProperty(value = "性别")
+    private Integer sex;
+    @ApiModelProperty(value = "关键字")
+    private String keyword;
+
+    public <T> QueryWrapper<T> queryWrapper() {
+        QueryWrapper<T> queryWrapper = new QueryWrapper<>();
+        queryWrapper.eq(StringUtils.isNotEmpty(nickName), "nick_name", nickName);
+        queryWrapper.eq(sex != null, "sex", sex);
+        queryWrapper.and(StringUtils.isNotEmpty(keyword),
+                        likeQueryWrapper -> likeQueryWrapper.like("user_name", keyword)
+                                                .or().like("nick_name", keyword));
+        return queryWrapper;
+    }
+}
\ No newline at end of file