以 [系统管理 -> 租户管理 -> 租户列表] 菜单为例子，讲解它的分页 + 搜索的实现。
1. 前端分页实现
1.1 Vue 界面
界面 tenant/index.vue (opens new window) 相关的代码如下：
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| <template>
<el-form :model="queryParams" ref="queryForm" size="small" :inline="true" v-show="showSearch" label-width="68px">
<el-form-item label="租户名" prop="name">
<el-input v-model="queryParams.name" placeholder="请输入租户名" clearable @keyup.enter.native="handleQuery"/>
</el-form-item>
<el-form-item label="联系人" prop="contactName">
<el-input v-model="queryParams.contactName" placeholder="请输入联系人" clearable @keyup.enter.native="handleQuery"/>
</el-form-item>
<el-form-item label="联系手机" prop="contactMobile">
<el-input v-model="queryParams.contactMobile" placeholder="请输入联系手机" clearable @keyup.enter.native="handleQuery"/>
</el-form-item>
<el-form-item label="租户状态" prop="status">
<el-select v-model="queryParams.status" placeholder="请选择租户状态" clearable>
<el-option v-for="dict in this.getDictDatas(DICT_TYPE.COMMON_STATUS)"
:key="dict.value" :label="dict.label" :value="dict.value"/>
</el-select>
</el-form-item>
<el-form-item>
<el-button type="primary" icon="el-icon-search" @click="handleQuery">搜索</el-button>
<el-button icon="el-icon-refresh" @click="resetQuery">重置</el-button>
</el-form-item>
</el-form>
<el-table v-loading="loading" :data="list">
</el-table>
<pagination v-show="total > 0" :total="total" :page.sync="queryParams.pageNo" :limit.sync="queryParams.pageSize"
@pagination="getList"/>
</template>
<script>
import { getTenantPage } from "@/api/system/tenant";
export default {
name: "Tenant",
components: {},
data() {
return {
loading: true,
showSearch: true,
total: 0,
list: [],
queryParams: {
pageNo: 1,
pageSize: 10,
name: null,
contactName: null,
contactMobile: null,
status: undefined,
},
}
},
created() {
this.getList();
},
methods: {
getList() {
this.loading = true;
let params = {...this.queryParams};
getTenantPage(params).then(response => {
this.list = response.data.list;
this.total = response.data.total;
this.loading = false;
});
},
handleQuery() {
this.queryParams.pageNo = 1;
this.getList();
},
resetQuery() {
this.resetForm("queryForm");
this.handleQuery();
}
}
}
</script>
|
1.2 API 请求
请求
system/tenant.js (
opens new window) 相关的代码如下：
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| import request from '@/utils/request'
export function getTenantPage(query) {
return request({
url: '/system/tenant/page',
method: 'get',
params: query
})
}
|
2.
后端分页实现
2.1
Controller 接口
在
TenantController (
opens new window) 类中，定义 /admin-api/system/tenant/page 接口。代码如下：
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| @Tag(name = "管理后台 - 租户")
@RestController
@RequestMapping("/system/tenant")
public class TenantController {
@Resource
private TenantService tenantService;
@GetMapping("/page")
@Operation(summary = "获得租户分页")
@PreAuthorize("@ss.hasPermission('system:tenant:query')")
public CommonResult<PageResult<TenantRespVO>> getTenantPage(@Valid TenantPageReqVO pageVO) {
PageResult<TenantDO> pageResult = tenantService.getTenantPage(pageVO);
return success(TenantConvert.INSTANCE.convertPage(pageResult));
}
}
|
2.1.1 分页参数 PageParam
分页请求，需要继承 PageParam (opens new window) 类。代码如下：
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| @Schema(description="分页参数")
@Data
public class PageParam implements Serializable {
private static final Integer PAGE_NO = 1;
private static final Integer PAGE_SIZE = 10;
@Schema(description = "页码，从 1 开始", required = true,example = "1")
@NotNull(message = "页码不能为空")
@Min(value = 1, message = "页码最小值为 1")
private Integer pageNo = PAGE_NO;
@Schema(description = "每页条数，最大值为 100", required = true, example = "10")
@NotNull(message = "每页条数不能为空")
@Min(value = 1, message = "每页条数最小值为 1")
@Max(value = 100, message = "每页条数最大值为 100")
private Integer pageSize = PAGE_SIZE;
}
|
分页条件，在子类中进行定义。以 TenantPageReqVO 举例子，代码如下：
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| @Schema(description = "管理后台 - 租户分页 Request VO")
@Data
@EqualsAndHashCode(callSuper = true)
@ToString(callSuper = true)
public class TenantPageReqVO extends PageParam {
@Schema(description = "租户名", example = "芋道")
private String name;
@Schema(description = "联系人", example = "芋艿")
private String contactName;
@Schema(description = "联系手机", example = "15601691300")
private String contactMobile;
@Schema(description = "租户状态（0正常 1停用）", example = "1")
private Integer status;
@DateTimeFormat(pattern = FORMAT_YEAR_MONTH_DAY_HOUR_MINUTE_SECOND)
@Schema(description = "创建时间")
private LocalDateTime[] createTime;
}
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分页结果
PageResult (
opens new window) 类，代码如下：
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| @Schema(description = "分页结果")
@Data
public final class PageResult<T> implements Serializable {
@Schema(description = "数据", required = true)
private List<T> list;
@Schema(description = "总量", required = true)
private Long total;
}
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分页结果的数据 list 的每一项，通过自定义 VO 类，例如说 TenantRespVO (opens new window) 类。
2.2 Mapper 查询
在 TenantMapper (opens new window) 类中，定义 selectPage 查询方法。代码如下：
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| @Mapper
public interface TenantMapper extends BaseMapperX<TenantDO> {
default PageResult<TenantDO> selectPage(TenantPageReqVO reqVO) {
return selectPage(reqVO, new LambdaQueryWrapperX<TenantDO>()
.likeIfPresent(TenantDO::getName, reqVO.getName())
.likeIfPresent(TenantDO::getContactName, reqVO.getContactName())
.likeIfPresent(TenantDO::getContactMobile, reqVO.getContactMobile())
.eqIfPresent(TenantDO::getStatus, reqVO.getStatus())
.betweenIfPresent(TenantDO::getCreateTime, reqVO.getBeginCreateTime(), reqVO.getEndCreateTime())
.orderByDesc(TenantDO::getId));
}
}
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针对 MyBatis Plus 分页查询的二次分装，在 BaseMapperX (opens new window) 中实现，主要是将 MyBatis 的分页结果 IPage，转换成项目的分页结果 PageResult。代码如下图：
分页实现