一、环境
开发工具：idea
jdk：1.7
mysql：5
框架：spring+springmvc+mybatis
使用maven来管理项目
二、与ssm整合
- 第一步：在pom.xml引入PageHelper的依赖
<!-- 引入mybatis的 pagehelper 分页插件 -->
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper</artifactId>
<version>5.1.2</version>
</dependency>
- 第二步：在mybatis的全局配置文件中配置PageHelper分页插件
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd"> <configuration> <!-- 引入 pageHelper插件 --> <!--注意这里要写成PageInterceptor, 5.0之前的版本都是写PageHelper, 5.0之后要换成PageInterceptor--> <plugins> <plugin interceptor="com.github.pagehelper.PageInterceptor"> <!--reasonable：分页合理化参数，默认值为false,直接根据参数进行查询。 当该参数设置为 true 时，pageNum<=0 时会查询第一页， pageNum>pages（超过总数时），会查询最后一页。--> <!--<property name="reasonable" value="true"/>--> </plugin> </plugins> </configuration>
三、使用
例如：实现对用户的多条件查询
- User实体类
package com.szfore.model;
import java.util.Date;
import java.util.List;
public class User {
private Integer id;
private String uname;
private String pwd;
private String name;
private Integer sex;
private String phone;
private String company;
private String jobtitle;
private String birth;
private Date createdate;
private Date lastlogintime;
private List<Role> roleList;
public List<Role> getRoleList() {
return roleList;
}
public void setRoleList(List<Role> roleList) {
this.roleList = roleList;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getUname() {
return uname;
}
public void setUname(String uname) {
this.uname = uname == null ? null : uname.trim();
}
public String getPwd() {
return pwd;
}
public void setPwd(String pwd) {
this.pwd = pwd == null ? null : pwd.trim();
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name == null ? null : name.trim();
}
public Integer getSex() {
return sex;
}
public void setSex(Integer sex) {
this.sex = sex;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone == null ? null : phone.trim();
}
public String getCompany() {
return company;
}
public void setCompany(String company) {
this.company = company == null ? null : company.trim();
}
public String getJobtitle() {
return jobtitle;
}
public void setJobtitle(String jobtitle) {
this.jobtitle = jobtitle == null ? null : jobtitle.trim();
}
public String getBirth() {
return birth;
}
public void setBirth(String birth) {
this.birth = birth == null ? null : birth.trim();
}
public Date getCreatedate() {
return createdate;
}
public void setCreatedate(Date createdate) {
this.createdate = createdate;
}
public Date getLastlogintime() {
return lastlogintime;
}
public void setLastlogintime(Date lastlogintime) {
this.lastlogintime = lastlogintime;
}
}
View Code
- UserMapper 注意：mapper中就按不分页的那种写法就好
package com.szfore.dao;
import com.szfore.model.User;
import com.szfore.model.UserExample;
import java.util.List;
import org.apache.ibatis.annotations.Param;
import org.springframework.stereotype.Repository;
@Repository
public interface UserMapper {
/**
* 多条件分页查询
* @param userParam
* @return
*/
public List<User> queryByPage(User userParam);
}
- UserMapper.xml 注意：sql中就不要写limit了，pageHelp会自己处理，sql就按不分页的那种写法就好
<!--多条件分页查询用户-->
<select id="queryByPage" resultMap="userAndRolesMap">
SELECT
*
FROM
`user`
WHERE
<if test="id != null and id != ''">
AND id = #{id}
</if>
<if test="uname != null and uname != ''">
AND uname = #{uname}
</if>
<if test="name != null and name != ''">
AND name like '%${name}%'
</if>
<if test="phone != null and phone != ''">
AND phone like '%${phone}%'
</if>
<if test="company != null and company != ''">
AND company like '%${company}%'
</if>
<if test="jobtitle != null and jobtitle != ''">
AND jobTitle like '%${jobtitle}%'
</if>
<if test="birth != null and birth != ''">
AND birth like '%${birth}%'
</if>
</select>
- UserServiceImpl
package com.szfore.service.impl;
import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import com.szfore.dao.MenuMapper;
import com.szfore.dao.UserMapper;
import com.szfore.dao.UserRoleMapper;
import com.szfore.model.*;
import com.szfore.service.IUserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import javax.servlet.http.HttpSession;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
@Service
public class UserServiceImpl implements IUserService{
@Autowired
private UserMapper userMapper;
@Autowired
private MenuMapper menuMapper;
@Autowired
private UserRoleMapper userRoleMapper;
/**
* 多条件分页查询用户
* @param userParam
* @param pageNum
* @param pageSize
* @return
*/
public Json queryByPage(User userParam,Integer pageNum,Integer pageSize) {
//利用PageHelper分页查询 注意：这个一定要放在第一行,否则无法进行分页,对紧随其后第一个sql语句有效
PageHelper.startPage(pageNum, pageSize);
List<User> userList = userMapper.queryByPage(userParam);
PageInfo<User> pageInfo = new PageInfo<User>(userList);
Json json = new Json();
json.setMsg("成功！");
json.setObj(pageInfo);
json.setSuccess(true);
return json;
}
}
说明：PageInfo是PageHelper自带的分页对象类，详情如下：
当前页 private int pageNum; 每页的数量 private int pageSize; 当前页的数量 private int size; //由于startRow和endRow不常用，这里说个具体的用法 //可以在页面中"显示startRow到endRow 共size条数据" 当前页面第一个元素在数据库中的行号 private int startRow; 当前页面最后一个元素在数据库中的行号 private int endRow; 总记录数 private long total; 总页数 private int pages; 结果集 private List<T> list; 第一页 private int firstPage; 前一页 private int prePage; 是否为第一页 private boolean isFirstPage = false; 是否为最后一页 private boolean isLastPage = false; 是否有前一页 private boolean hasPreviousPage = false; 是否有下一页 private boolean hasNextPage = false; 导航页码数 private int navigatePages; 所有导航页号 private int[] navigatepageNums;View Code