数组分页
查询出全部数据，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); 实现接口 @Override public List<Student> queryStudentsByArray(int currPage, int pageSize) { //查询全部数据 List<Student> students = studentMapper.queryStudentsByArray(); //从第几条数据开始 int firstIndex = (currPage - 1) * pageSize; //到第几条数据结束 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; }
sql分页
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); 实现类 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); }
拦截器分页
创建拦截器，拦截mybatis接口方法id以ByPage结束的语句
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 说明是一个拦截器 * @Signature 拦截器的签名 * type 拦截的类型 四大对象之一( Executor,ResultSetHandler,ParameterHandler,StatementHandler) * method 拦截的方法 * args 参数,高版本需要加个Integer.class参数,不然会报错 */ @Intercepts({@Signature(type = StatementHandler.class, method = "prepare", args = {Connection.class})}) public class MyPageInterceptor implements Interceptor { //每页显示的条目数 private int pageSize; //当前现实的页数 private int currPage; //数据库类型 private String dbType; @Override public Object intercept(Invocation invocation) throws Throwable { //获取StatementHandler，默认是RoutingStatementHandler StatementHandler statementHandler = (StatementHandler) invocation.getTarget(); //获取statementHandler包装类 MetaObject MetaObjectHandler = SystemMetaObject.forObject(statementHandler); //分离代理对象链 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); } //获取连接对象 //Connection connection = (Connection) invocation.getArgs()[0]; //object.getValue("delegate"); 获取StatementHandler的实现类 //获取查询接口映射的相关信息 MappedStatement mappedStatement = (MappedStatement) MetaObjectHandler.getValue("delegate.mappedStatement"); String mapId = mappedStatement.getId(); //statementHandler.getBoundSql().getParameterObject(); //拦截以.ByPage结尾的请求，分页功能的统一实现 if (mapId.matches(".+ByPage$")) { //获取进行数据库操作时管理参数的handler ParameterHandler parameterHandler = (ParameterHandler) MetaObjectHandler.getValue("delegate.parameterHandler"); //获取请求时的参数 Map<String, Object> paraObject = (Map<String, Object>) parameterHandler.getParameterObject(); //也可以这样获取 //paraObject = (Map<String, Object>) statementHandler.getBoundSql().getParameterObject(); //参数名称和在service中设置到map中的名称一致 currPage = (int) paraObject.get("currPage"); pageSize = (int) paraObject.get("pageSize"); String sql = (String) MetaObjectHandler.getValue("delegate.boundSql.sql"); //也可以通过statementHandler直接获取 //sql = statementHandler.getBoundSql().getSql(); //构建分页功能的sql语句 String limitSql; sql = sql.trim(); limitSql = sql + " limit " + (currPage - 1) * pageSize + "," + pageSize; //将构建完成的分页sql语句赋值个体'delegate.boundSql.sql'，偷天换日 MetaObjectHandler.setValue("delegate.boundSql.sql", limitSql); } //调用原对象的方法，进入责任链的下一级 return invocation.proceed(); } //获取代理对象 @Override public Object plugin(Object o) { //生成object对象的动态代理对象 return Plugin.wrap(o, this); } //设置代理对象的参数 @Override public void setProperties(Properties properties) { //如果项目中分页的pageSize是统一的，也可以在这里统一配置和获取，这样就不用每次请求都传递pageSize参数了。参数是在配置拦截器时配置的。 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")
@ResponseBody
public Page getAllBook(String pageNo,String pageSize,HttpServletRequest request,HttpServletResponse response){
pageNo=pageNo==null?"1":pageNo; //当前页码
pageSize=pageSize==null?"5":pageSize; //页面大小
//获取当前页数据
List<AccountExt> list = bookService.getAllBookByPage(pageNo,pageSize);
//获取总数据大小
int totals = bookService.getAllBook();
//封装返回结果
Page page = new Page();
page.setTotal(totals+"");
page.setRows(list);
return page;
}Page实体类
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; } }
前端
bootstrap-table接受数据格式
{ "total": 3, "rows": [ { "id": 0, "name": "Item 0", "price": "$0" }, { "id": 1, "name": "Item 1", "price": "$1" } ] }
boostrap-table用法
var $table = $('#table'); $table.bootstrapTable({ url: "/${appName}/manager/bookController/getAllBook", method: 'post', contentType: "application/x-www-form-urlencoded", dataType: "json", pagination: true, //分页 sidePagination: "server", //服务端处理分页 pageList: [5, 10, 25], pageSize: 5, pageNumber:1, //toolbar:"#tb", singleSelect: false, queryParamsType : "limit", queryParams: function queryParams(params) { //设置查询参数 var param = { pageNo: params.offset/params.limit+1, //offset为数据开始索引,转换为显示当前页 pageSize: params.limit //页面大小 }; console.info(params); //查看参数是什么 console.info(param); //查看自定义的参数 return param; }, cache: false, //data-locale: "zh-CN", //表格汉化 //search: true, //显示搜索框 columns: [ { checkbox: true }, { title: '消费类型', field: 'cate_name', valign: 'middle' }, { title: '消费金额', field: 'money', valign: 'middle', formatter:function(value,row,index){ if(!isNaN(value)){ //是数字 return value/100; } } }, { title: '备注', field: 'remark', valign: 'middle' }, { title: '消费时间', field: 'time', valign: 'middle' }, { title: '操作', field: '', formatter:function(value,row,index){ var f = '<a href="#" class="btn btn-gmtx-define1" onclick="delBook(\''+ row.id +'\')">删除</a> '; return f; } } ] }); });
RowBounds分页
数据量小时，RowBounds不失为一种好办法。但是数据量大时，实现拦截器就很有必要了。
mybatis接口加入RowBounds参数
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)); }
