1.數(shù)組分頁(yè)

查詢出全部數(shù)據(jù)，然后再list中截取需要的部分。

mybatis接口

List<Student> queryStudentsByArray();

xml配置文件

<select id="queryStudentsByArray" resultMap="studentmapper">select * from student</select>

service

接口 List<Student> queryStudentsByArray(int currPage, int pageSize); 實(shí)現(xiàn)接口@Overridepublic List<Student> queryStudentsByArray(int currPage, int pageSize) {//查詢?nèi)繑?shù)據(jù)List<Student> students = studentMapper.queryStudentsByArray();//從第幾條數(shù)據(jù)開始int firstIndex = (currPage - 1) * pageSize;//到第幾條數(shù)據(jù)結(jié)束int lastIndex = currPage * pageSize;return students.subList(firstIndex, lastIndex); //直接在list中截取}

controller

@ResponseBody@RequestMapping("/student/array/{currPage}/{pageSize}")public List<Student> getStudentByArray(@PathVariable("currPage") int currPage, @PathVariable("pageSize") int pageSize) {List<Student> student = StuServiceIml.queryStudentsByArray(currPage, pageSize);return student;}

2.sql分頁(yè)

mybatis接口

List<Student> queryStudentsBySql(Map<String,Object> data);

xml文件

<select id="queryStudentsBySql" parameterType="map" resultMap="studentmapper">select * from student limit #{currIndex} , #{pageSize} </select>

service

接口 List<Student> queryStudentsBySql(int currPage, int pageSize); 實(shí)現(xiàn)類 public List<Student> queryStudentsBySql(int currPage, int pageSize) {Map<String, Object> data = new HashedMap();data.put("currIndex", (currPage-1)*pageSize);data.put("pageSize", pageSize);return studentMapper.queryStudentsBySql(data);}

3.攔截器分頁(yè)

創(chuàng)建攔截器，攔截mybatis接口方法id以ByPage結(jié)束的語句

package com.autumn.interceptor; ? import org.apache.ibatis.executor.Executor; import org.apache.ibatis.executor.parameter.ParameterHandler; import org.apache.ibatis.executor.resultset.ResultSetHandler; import org.apache.ibatis.executor.statement.StatementHandler; import org.apache.ibatis.mapping.MappedStatement; import org.apache.ibatis.plugin.*; import org.apache.ibatis.reflection.MetaObject; import org.apache.ibatis.reflection.SystemMetaObject; ? import java.sql.Connection; import java.util.Map; import java.util.Properties; ? /*** @Intercepts 說明是一個(gè)攔截器* @Signature 攔截器的簽名* type 攔截的類型 四大對(duì)象之一( Executor,ResultSetHandler,ParameterHandler,StatementHandler)* method 攔截的方法* args 參數(shù),高版本需要加個(gè)Integer.class參數(shù),不然會(huì)報(bào)錯(cuò)*/ @Intercepts({@Signature(type = StatementHandler.class, method = "prepare", args = {Connection.class})}) public class MyPageInterceptor implements Interceptor { ?//每頁(yè)顯示的條目數(shù)private int pageSize;//當(dāng)前現(xiàn)實(shí)的頁(yè)數(shù)private int currPage;//數(shù)據(jù)庫(kù)類型private String dbType; ? ?@Overridepublic Object intercept(Invocation invocation) throws Throwable {//獲取StatementHandler，默認(rèn)是RoutingStatementHandlerStatementHandler statementHandler = (StatementHandler) invocation.getTarget();//獲取statementHandler包裝類MetaObject MetaObjectHandler = SystemMetaObject.forObject(statementHandler); ?//分離代理對(duì)象鏈while (MetaObjectHandler.hasGetter("h")) {Object obj = MetaObjectHandler.getValue("h");MetaObjectHandler = SystemMetaObject.forObject(obj);} ?while (MetaObjectHandler.hasGetter("target")) {Object obj = MetaObjectHandler.getValue("target");MetaObjectHandler = SystemMetaObject.forObject(obj);} ?//獲取連接對(duì)象//Connection connection = (Connection) invocation.getArgs()[0]; ? ?//object.getValue("delegate"); 獲取StatementHandler的實(shí)現(xiàn)類 ?//獲取查詢接口映射的相關(guān)信息MappedStatement mappedStatement = (MappedStatement) MetaObjectHandler.getValue("delegate.mappedStatement");String mapId = mappedStatement.getId(); ?//statementHandler.getBoundSql().getParameterObject(); ?//攔截以.ByPage結(jié)尾的請(qǐng)求，分頁(yè)功能的統(tǒng)一實(shí)現(xiàn)if (mapId.matches(".+ByPage$")) {//獲取進(jìn)行數(shù)據(jù)庫(kù)操作時(shí)管理參數(shù)的handlerParameterHandler parameterHandler = (ParameterHandler) MetaObjectHandler.getValue("delegate.parameterHandler");//獲取請(qǐng)求時(shí)的參數(shù)Map<String, Object> paraObject = (Map<String, Object>) parameterHandler.getParameterObject();//也可以這樣獲取//paraObject = (Map<String, Object>) statementHandler.getBoundSql().getParameterObject(); ?//參數(shù)名稱和在service中設(shè)置到map中的名稱一致currPage = (int) paraObject.get("currPage");pageSize = (int) paraObject.get("pageSize"); ?String sql = (String) MetaObjectHandler.getValue("delegate.boundSql.sql");//也可以通過statementHandler直接獲取//sql = statementHandler.getBoundSql().getSql(); ?//構(gòu)建分頁(yè)功能的sql語句String limitSql;sql = sql.trim();limitSql = sql + " limit " + (currPage - 1) * pageSize + "," + pageSize; ?//將構(gòu)建完成的分頁(yè)sql語句賦值個(gè)體'delegate.boundSql.sql'，偷天換日MetaObjectHandler.setValue("delegate.boundSql.sql", limitSql);}//調(diào)用原對(duì)象的方法，進(jìn)入責(zé)任鏈的下一級(jí)return invocation.proceed();} ? ?//獲取代理對(duì)象@Overridepublic Object plugin(Object o) {//生成object對(duì)象的動(dòng)態(tài)代理對(duì)象return Plugin.wrap(o, this);} ?//設(shè)置代理對(duì)象的參數(shù)@Overridepublic void setProperties(Properties properties) {//如果項(xiàng)目中分頁(yè)的pageSize是統(tǒng)一的，也可以在這里統(tǒng)一配置和獲取，這樣就不用每次請(qǐng)求都傳遞pageSize參數(shù)了。參數(shù)是在配置攔截器時(shí)配置的。String limit1 = properties.getProperty("limit", "10");this.pageSize = Integer.valueOf(limit1);this.dbType = properties.getProperty("dbType", "mysql");} }

配置文件SqlMapConfig.xml

<configuration><plugins><plugin interceptor="com.autumn.interceptor.MyPageInterceptor"><property name="limit" value="10"/><property name="dbType" value="mysql"/></plugin></plugins></configuration>

mybatis配置

<!--接口--> List<AccountExt> getAllBookByPage(@Param("currPage")Integer pageNo,@Param("pageSize")Integer pageSize); <!--xml配置文件--><sql id="getAllBooksql" >acc.id, acc.cateCode, cate_name, user_id,u.name as user_name, money, remark, time</sql><select id="getAllBook" resultType="com.autumn.pojo.AccountExt" >select<include refid="getAllBooksql" />from account as acc</select>

service

public List<AccountExt> getAllBookByPage(String pageNo,String pageSize) {return accountMapper.getAllBookByPage(Integer.parseInt(pageNo),Integer.parseInt(pageSize));}

controller

@RequestMapping("/getAllBook")@ResponseBodypublic Page getAllBook(String pageNo,String pageSize,HttpServletRequest request,HttpServletResponse response){pageNo=pageNo==null?"1":pageNo; //當(dāng)前頁(yè)碼pageSize=pageSize==null?"5":pageSize; //頁(yè)面大小//獲取當(dāng)前頁(yè)數(shù)據(jù)List<AccountExt> list = bookService.getAllBookByPage(pageNo,pageSize);//獲取總數(shù)據(jù)大小int totals = bookService.getAllBook();//封裝返回結(jié)果Page page = new Page();page.setTotal(totals+"");page.setRows(list);return page;}

Page實(shí)體類

package com.autumn.pojo;import java.util.List;/*** Created by Autumn on 2018/6/21.*/ public class Page {private String pageNo = null;private String pageSize = null;private String total = null;private List rows = null;public String getTotal() {return total;}public void setTotal(String total) {this.total = total;}public List getRows() {return rows;}public void setRows(List rows) {this.rows = rows;}public String getPageNo() {return pageNo;}public void setPageNo(String pageNo) {this.pageNo = pageNo;}public String getPageSize() {return pageSize;}public void setPageSize(String pageSize) {this.pageSize = pageSize;}}

4.RowBounds分頁(yè)

數(shù)據(jù)量小時(shí)，RowBounds不失為一種好辦法。但是數(shù)據(jù)量大時(shí)，實(shí)現(xiàn)攔截器就很有必要了。

mybatis接口加入RowBounds參數(shù)

public List<UserBean> queryUsersByPage(String userName, RowBounds rowBounds);

service

@Override@Transactional(isolation = Isolation.READ_COMMITTED, propagation = Propagation.SUPPORTS)public List<RoleBean> queryRolesByPage(String roleName, int start, int limit) {return roleDao.queryRolesByPage(roleName, new RowBounds(start, limit));}

總結(jié)

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