mybatis IDEA——自定义分页和分页插件的使用
PageHelper实现了通用的分页查询，其支持的数据有，mysql、Oracle、DB2、PostgreSQL等主流的数据库。
使用说明：https://github.com/pagehelper/Mybatis-PageHelper/blob/master/wikis/en/HowToUse.md
导入依赖
com.github.pagehelper
pagehelper
5.1.4
mybatis-config.xml中配置
plugins在配置文件中的位置必须符合要求，否则会报错，顺序如下:
properties?, settings?, typeAliases?, typeHandlers?, objectFactory?,objectWrapperFactory?, plugins?, environments?, databaseIdProvider?, mappers?
接口
Long getTotalRowCount(String keywords);
Page getUsersByPage(int pageIndex, int pageSize);
Page getUsersByPage(String keywords, int pageIndex, int pageSize);
PageInfo getUsersByPage2(int pageIndex, int pageSize);
PageInfo getUsersByPage2(String keywords, int pageIndex, int pageSize); xml
实体类
package com.etc.entity;
import java.util.List;
public class Page {
/**
* 每页条数
*/
private int pageSize = 10;
/**
* 第几页
*/
private int pageIndex = 1;
/**
* 总的记录数
*/
private long totalRowCount;
/**
* 数据
*/
private List data;
/**
* 是否有上一页
*/
private boolean hasPrevPage;
/**
* 是否有下一页
*/
private boolean hasNextPage;
/**
* @return the pageSize
*/
public int getPageSize() {
return pageSize;
}
/**
* @param pageSize the pageSize to set
*/
public void setPageSize(int pageSize) {
this.pageSize = pageSize;
}
/**
* @return the pageIndex
*/
public int getPageIndex() {
return pageIndex;
}
/**
* @param pageIndex the pageIndex to set
*/
public void setPageIndex(int pageIndex) {
this.pageIndex = pageIndex;
}
/**
* @return the totalRowCount
*/
public long getTotalRowCount() {
return totalRowCount;
}
/**
* @param totalRowCount the totalRowCount to set
*/
public void setTotalRowCount(long totalRowCount) {
this.totalRowCount = totalRowCount;
}
/**
* @return the data
*/
public List getData() {
return data;
}
/**
* @param data the data to set
*/
public void setData(List data) {
this.data = data;
}
/**
* @return the totalPageCount
*/
public long getTotalPageCount() {
if(this.totalRowCount % this.pageSize == 0){
return this.totalRowCount / this.pageSize;
}else{
return this.totalRowCount / this.pageSize + 1;
}
}
/**
* @return the hasPrevPage
*/
public boolean getHasPrevPage() {
//什么情况下有上一页，如果当前页>1
return this.pageIndex > 1;
}
/**
* @return the hasNextPage
*/
public boolean getHasNextPage() {
//如果当前页和总的页数一样，则没有下一页，其它情况都有下一页
return this.pageIndex == this.getTotalPageCount() ? false : true;
}
public Page(){
}
/**
* 有参构造方法
* @param pageSize 每页的条数
* @param pageIndex 当前页码
* @param totalRowCount 总的记录数
* @param data 数据
*/
public Page(int pageSize, int pageIndex, long totalRowCount, List data) {
super();
this.pageSize = pageSize;
this.pageIndex = pageIndex;
this.totalRowCount = totalRowCount;
this.data = data;
}
}
servie实现类
@Override
public Long getTotalRowCount(String keywords){
return userDao.getTotalRowCount(keywords);
}
@Override
public Page getUsersByPage(int pageIndex, int pageSize){
int startIndex = (pageIndex - 1) * pageSize;
List users = userDao.getUsersByPage(null,startIndex,pageSize);
Long totalRowCount = userDao.getTotalRowCount(null);
com.etc.entity.Page page = new com.etc.entity.Page(pageIndex,pageSize,totalRowCount,users);
return page;
}
@Override
public Page getUsersByPage(String keywords, int pageIndex, int pageSize){
int startIndex = (pageIndex - 1) * pageSize;
List users = userDao.getUsersByPage(keywords,startIndex,pageSize);
Long totalRowCount = userDao.getTotalRowCount(keywords);
com.etc.entity.Page page = new com.etc.entity.Page(pageIndex,pageSize,totalRowCount,users);
return page;
}
@Override
public PageInfo getUsersByPage2(int pageIndex, int pageSize){
PageHelper.startPage(pageIndex,pageSize,true);
List users = userDao.getUsersByPage2(null);
PageInfo pageInfo = new PageInfo<>(users);
return pageInfo;
}
@Override
public PageInfo getUsersByPage2(String keywords, int pageIndex, int pageSize){
PageHelper.startPage(pageIndex,pageSize,true);
List users = userDao.getUsersByPage2(keywords);
PageInfo pageInfo = new PageInfo<>(users);
return pageInfo;
} 测试类
@Test
/**
* 自定义分页类，没有传递关键词参数
*/
public void testGetUsersByPageWithoutKeywords(){
com.etc.entity.Page page = userService.getUsersByPage(3,2);
System.out.println(page);
}
@Test
/**
* 自定义分页类，有传递关键词参数
*/
public void testGetUsersByPageWithKeywords(){
com.etc.entity.Page page = userService.getUsersByPage("e",2,1);
System.out.println(page);
}
@Test
/**
* 使用分页插件，没有传递关键词参数
*/
public void testGetUsersByPage2WithoutKeywords(){
com.github.pagehelper.PageInfo page = userService.getUsersByPage2(3,2);
System.out.println(page);
}
@Test
/**
* 使用分页插件，传递关键词参数
*/
public void testGetUsersByPage2WithKeywords(){
com.github.pagehelper.PageInfo page = userService.getUsersByPage2("e",2,1);
System.out.println(page);
}
} 自定义分页查询jsp页面
当前是第${page.pageIndex}页,共${page.totalPageCount }页，总记录数为${page.totalRowCount }条。