springboot之mybatis分页查询

首先写一个基础的分类bean插件，由下面两个类组成

package com.my.utils;import com.fasterxml.jackson.annotation.JsonFormat;
import org.apache.commons.lang3.StringUtils;
import org.springframework.format.annotation.DateTimeFormat;import java.util.Date;/*** * @author luozejun**/
public class BaseBean {private Integer page ;private Integer rows ;private String sort;private String order;/*** 分页导航*/private Pager pager = new Pager();public Pager getPager() {if(page!=null && rows!=null){pager.setPageId(page);pager.setPageSize(rows);String orderField="";if(StringUtils.isNotBlank(sort)){orderField = sort;}if(StringUtils.isNotBlank(orderField) && StringUtils.isNotBlank(order)){orderField +=" "+ order;}pager.setOrderField(orderField);return pager;}else{return pager;}}public void setPager(Pager pager) {this.pager = pager;}public Integer getPage() {return page;}public void setPage(Integer page) {this.page = page;}public Integer getRows() {return rows;}public void setRows(Integer rows) {this.rows = rows;}public String getSort() {return sort;}public void setSort(String sort) {this.sort = sort;}public String getOrder() {return order;}public void setOrder(String order) {this.order = order;}}

package com.my.utils;/*** <p>* Title: WASU Platform* </p>* <p>* Description: 分页技术的实现。* </p>* <p>* Copyright: 2006-2008* </p>* <p>* Company:* </p>** @author* @version 2.0*/
// oracle,sqlserver,mysql分页技术
public class Pager {//pageprivate Integer pageId ; // 当前页//rowprivate Integer pageSize ; // 页大小private Integer pageOffset = 0;// 当前页起始记录private String orderField;private Integer pageEnd;private boolean orderDirection = true;public Integer getPageEnd() {return pageEnd;}public void setPageEnd(Integer pageEnd) {this.pageEnd = pageEnd;}protected void doPage() {if(pageSize ==null || pageId==null){ return ;}this.pageOffset = (this.pageId - 1) * this.pageSize;}public String getOrderCondition() {String condition = "";if (this.orderField != null && this.orderField.length() != 0) {condition = " order by " + orderField+ (orderDirection ? " " : " desc ");}return condition;}public String getMysqlQueryCondition() {if(pageSize ==null || pageId==null) {return null;}if(pageOffset == null){doPage();}this.pageEnd = pageOffset + pageSize;String condition = "";condition = " limit " + pageOffset + "," + pageSize;return condition;}public String getMysqlQueryStudip() {String condition = " limit " + pageOffset + "," + pageSize;return condition;}public void setOrderDirection(boolean orderDirection) {this.orderDirection = orderDirection;}public boolean isOrderDirection() {return orderDirection;}public void setOrderField(String orderField) {this.orderField = orderField;}public String getOrderField() {return orderField;}public void setPageId(Integer pageId) {this.pageId = pageId;if(pageSize!=null){doPage();this.pageEnd = pageOffset + pageSize;}}public Integer getPageId() {return pageId;}public void setPageOffset(Integer pageOffset) {this.pageOffset = pageOffset;}public Integer getPageOffset() {return pageOffset;}public void setPageSize(Integer pageSize) {this.pageSize = pageSize;if(pageId!=null){doPage();this.pageEnd = pageOffset + pageSize;}}public Integer getPageSize() {return pageSize;}}

再写一个应答类

package com.my.utils;public class ResultEndBean {private Object data;private Integer codeId;private String msg;public ResultEndBean(Object data) {this();setData(data);}public ResultEndBean() {codeId = 0;msg = "success";}public ResultEndBean(boolean flag) {codeId = flag?0:1;msg = flag?"success":"error";}public ResultEndBean(boolean flag, String msg) {codeId = flag?0:1;this.msg = msg;}public ResultEndBean(Integer codeId, String msg, Object data) {this.codeId = codeId;this.msg = msg;this.data = data;}public ResultEndBean(Integer codeId, String msg) {this.codeId = codeId;this.msg = msg;}public ResultEndBean(Integer codeId) {this.codeId = codeId;}public Object getData() {return data;}public void setData(Object data) {this.data = data;}public Integer getCodeId() {return codeId;}public void setCodeId(Integer codeId) {this.codeId = codeId;}public String getMsg() {return msg;}public void setMsg(String msg) {this.msg = msg;}}

处理方式如下：

@RestController
public class UsercopyControl {@AutowiredUsercopyMapper  usercopyMapper;@GetMapping("/page")ResultEndBean GetPage(BaseBean baseBean){Map<String,Object> map = new HashMap<>(4);List<Usercopy> usercopies = usercopyMapper.GetTotal(baseBean);map.put("data", usercopies);return new ResultEndBean(map);}
}

XML编写如下：

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapperPUBLIC "-//mybatis.org//DTD Mapper 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.my.mapper.UsercopyMapper"><select id="GetTotal" parameterType="com.my.utils.BaseBean" resultType = "Usercopy" >SELECT  id,myname,age FROM  user_copy  where 1 = 1<if test="pager.mysqlQueryCondition != null and pager.mysqlQueryCondition != ''" >${pager.mysqlQueryCondition}</if></select>
</mapper>

最后，使用postman测试

********************************遇到一个大坑，name字段一直返回为null，后来发现居然加了一个string 的引用

import com.sun.org.apache.xpath.internal.operations.String;

去掉这个，即OK了

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