spring boot集成mybatis,集成使用mybatis拖沓了好久，今天终于可以补起来了。
本篇源码中,同时使用了Spring data JPA 和 Mybatis两种方式.
在使用的过程中一定要注意,JPA和Mybatis可以在同一个方法中调用,但是如果要保证事务一致性,千万不要把JPA的操作和Mybatis的操作放在一个事务中
项目GitHub地址：GitHub地址
spring boot 2.0
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注意点：
1.mybatis是有自动生成实体、Mapper映射类[实际是接口]、Mapper.xml映射文件的插件，插件名字叫【mybatis generator】，这里没有使用。
2.使用mybatis的话，是有两种实现方式的。
1》注解的方式
2》映射文件的方式
其实，注解的方式类似于JPA 的使用注解@Query()的方式。
整个使用下来，还是建议简单的CRUD操作，使用spring-data-JPA进行操作可以节省大量的代码量。
复杂的查询操作，就可以采用mybatis来完成，通过自己写sql语句提高灵活性，当然使用JPA来操作也可以完成。
3.第二点中的注解和映射文件两种方式 可以一起使用。
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下面，分【注解方式】和【映射文件方式】两个大模块进行展示，并
1.pom.xml文件
除了spring boot项目的默认配置之外，再加上mysql的jar和mybatis的jar即可【这里先把mybatis的分页插件pagehelper的jar包加上，留在最后说】【使用这个分页jar包，会导致分页无效，至少在spring boot2.0是无效的】
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<!--mybatis-->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.2</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.github.pagehelper/pagehelper mybatis分页插件-->
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper</artifactId>
<version>5.1.4</version>
</dependency>pagehelper分页插件分页查询无效解决方法
修改之后采用的分页jar包【有效的分页】
<!-- https://mvnrepository.com/artifact/com.github.pagehelper/pagehelper-spring-boot-starter mybatis分页插件-->
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper-spring-boot-starter</artifactId>
<version>1.2.5</version>
</dependency>
2.application.properties配置
server.port=9666
#datasource
spring.datasource.continue-on-error=false
spring.datasource.url=jdbc:mysql://localhost:3306/swapping?useSSL=false&useUnicode=true&characterEncoding=UTF-8
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
#mybatis相关配置
#mybatis映射文件的位置
mybatis.mapper-locations=classpath:mapper/*.xml
#mybatis指定entity位置
mybatis.type-aliases-package=com.sxd.swapping.domain
#mybatis展示sql语句执行
logging.level.com.sxd.swapping.dao.mybatis=debug
==========================注解方式======================
3.实体类
package com.sxd.swapping.base;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Sort;
import javax.persistence.*;
import java.util.*;
import java.util.stream.Collectors;
/**
* 基础bean
*/
@MappedSuperclass
public class BaseBean {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;// 主键 自增
@Column(nullable = false, updatable = false)
private Date createDate;// 创建时间
private Date updateDate;// 修改时间
private String updateId; // 修改人
@Column(nullable = false)
private String createId; // 创建人
@Column(nullable = false)
private String uid; //业务主键
@Transient
private Integer pageNum = 0; //分页 页号
@Transient
private Integer pageSize = 10; //分页 页量
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public Date getCreateDate() {
return createDate;
}
public void setCreateDate(Date createDate) {
this.createDate = createDate;
}
public Date getUpdateDate() {
return updateDate;
}
public void setUpdateDate(Date updateDate) {
this.updateDate = updateDate;
}
public String getUpdateId() {
return updateId;
}
public void setUpdateId(String updateId) {
this.updateId = updateId;
}
public String getCreateId() {
return createId;
}
public void setCreateId(String createId) {
this.createId = createId;
}
public String getUid() {
return uid;
}
public void setUid(String uid) {
this.uid = uid;
}
public Integer getPageNum() {
return pageNum;
}
public void setPageNum(Integer pageNum) {
this.pageNum = pageNum;
}
public Integer getPageSize() {
return pageSize;
}
public void setPageSize(Integer pageSize) {
this.pageSize = pageSize;
}
public void initEntity(){
this.createDate = new Date();
this.createId = UUID.randomUUID().toString();//如果有当前登陆人，则初始化为当前登陆人
this.uid = UUID.randomUUID().toString();
}
public void updateEntity(){
this.updateDate = new Date();
this.updateId = UUID.randomUUID().toString();//如果有当前登陆人，则赋值为当前登陆人
}
/**
* 分页 工具方法
* @return
*/
public PageRequest page(){
return PageRequest.of(pageNum,this.pageSize);
}
/**
* 分页 排序工具方法
*
* 中文字段排序 需要在查询出来后处理 sort无法解决中文排序的问题
* @param map
* @param obj
* @return
* @throws Exception
*/
public PageRequest page(Map<String,Sort.Direction> map,Object obj) throws Exception{
//反射获取实体所有属性
List<String> properties = Arrays.stream(obj.getClass().getDeclaredFields()).map(i->i.getName()).collect(Collectors.toList());
Set<String> keySet = map.keySet();
Sort sort = null;
if (properties.containsAll(keySet)){
for (String str:keySet){
if (sort == null){
sort = Sort.by(map.get(str),str);
}else{
sort = sort.and(Sort.by(map.get(str),str));
}
}
}else{
throw new Exception("排序字段非本实体字段");
}
return PageRequest.of(this.pageNum,this.pageSize,sort);
}
}
package com.sxd.swapping.domain;
import com.sxd.swapping.base.BaseBean;
import lombok.Getter;
import lombok.Setter;
import org.apache.commons.lang3.StringUtils;
import org.springframework.data.jpa.domain.Specification;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Table;
import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Predicate;
import javax.persistence.criteria.Root;
import java.io.Serializable;
import java.util.*;
@Entity
@Table
@Getter
@Setter
public class HuaYangArea extends BaseBean implements Serializable {
private static final long serialVersionUID = -1851783771574739215L;
@Column(nullable = false)
private String areaName;
@Column(nullable = false)
private Long areaPerson;
public static Specification<HuaYangArea> where(HuaYangArea huaYangArea){
return new Specification<HuaYangArea>() {
@Override
public Predicate toPredicate(Root<HuaYangArea> root, CriteriaQuery<?> criteriaQuery, CriteriaBuilder criteriaBuilder) {
//创建查询列表
List<Predicate> predicates = new ArrayList<>();
//字段areaName是否查询
String areaName = huaYangArea.getAreaName();
if (StringUtils.isNotBlank(areaName)){
predicates.add(criteriaBuilder.like(root.get("areaName"),"%"+areaName+"%"));
}
//字段areaPerson是否查询
Long areaPerson = huaYangArea.getAreaPerson();
if (areaPerson != null) {
predicates.add(criteriaBuilder.equal(root.get("areaPerson"),areaPerson));
}
return criteriaQuery.where(predicates.toArray(new Predicate[predicates.size()])).getRestriction();
}
};
}
}
4.自己写的mapper映射类[实际是接口]，等同于dao层【注意@Mapper注解没有加在这个类上，是因为采用了在启动类上加@MapperScan(“Mapper类所在包路径”)的方式】
启动类代码:
package com.sxd.swapping;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.scheduling.annotation.EnableScheduling;
@EnableScheduling
@SpringBootApplication
@MapperScan("com.sxd.swapping.dao.mybatis")
public class SwappingApplication {
public static void main(String[] args) {
SpringApplication.run(SwappingApplication.class, args);
}
}
【重点是看Mapper层的sql语句怎么写】
package com.sxd.swapping.dao.mybatis;
import com.sxd.swapping.domain.HuaYangArea;
import org.apache.ibatis.annotations.*;
import java.util.Date;
import java.util.List;
public interface HuaYangAreaMapper {
/**
* 根据业务主键查询
* @param uid
* @return
*/
@Select("SELECT * FROM hua_yang_area where uid = #{uid}")
@Results({
@Result(property = "areaName",column = "area_name",javaType = String.class),
@Result(property = "areaPerson",column = "area_person",javaType = Long.class),
@Result(property = "createId",column = "create_id",javaType = String.class)
})
HuaYangArea findOne(String uid);
/**
* 根据数据库主键 查询
* @param id
* @return
*/
@Select("SELECT * FROM hua_yang_area WHERE id = #{id}")
@Results({
@Result(property = "areaName",column = "area_name",javaType = String.class),
@Result(property = "areaPerson",column = "area_person",javaType = Long.class),
@Result(property = "createId",column = "create_id",javaType = String.class),
@Result(property = "createDate",column = "create_date",javaType = Date.class),
@Result(property = "updateDate",column = "update_date",javaType = Date.class)
})
HuaYangArea selectById(Long id);
/**
* 模糊查询 方法1
* @param areaName 不传入值 则查到所有
* @return
*/
@Select("SELECT * FROM hua_yang_area WHERE area_name like '%${areaName}%'")
@Results({
@Result(property = "areaName",column = "area_name",javaType = String.class),
@Result(property = "areaPerson",column = "area_person",javaType = Long.class),
@Result(property = "createId",column = "create_id",javaType = String.class),
@Result(property = "createDate",column = "create_date",javaType = Date.class),
@Result(property = "updateDate",column = "update_date",javaType = Date.class)
})
List<HuaYangArea> selectByNameLike(@Param("areaName") String areaName);
/**
* 模糊查询 方法2
* @param areaName 不传入值则 一条也查不到
* @return
*/
@Select("SELECT * FROM hua_yang_area WHERE area_name like CONCAT(CONCAT('%',#{areaName}),'%')")
@Results({
@Result(property = "areaName",column = "area_name",javaType = String.class),
@Result(property = "areaPerson",column = "area_person",javaType = Long.class),
@Result(property = "createId",column = "create_id",javaType = String.class),
@Result(property = "createDate",column = "create_date",javaType = Date.class),
@Result(property = "updateDate",column = "update_date",javaType = Date.class)
})
List<HuaYangArea> selectByNameLike2(String areaName);
/**
* 插入 新增
* @param huaYangArea
* @return
*/
@Insert("INSERT INTO hua_yang_area(create_date,create_id,uid,area_name,area_person) VALUES (#{createDate},#{createId},#{uid},#{areaName},#{areaPerson}) ")
void insert(HuaYangArea huaYangArea);
/**
* 更新 根据数据库主键更新
* @param huaYangArea
*/
@Update("UPDATE hua_yang_area SET update_date=#{updateDate},update_id=#{updateId},area_name=#{areaName},area_person=#{areaPerson} WHERE id=#{id}")
void update(HuaYangArea huaYangArea);
/**
* 删除 根据数据库主键删除
* @param id
*/
@Delete("DELETE FROM hua_yang_area WHERE id=#{id}")
void delete(Long id);
}
5.serviceImpl层【service层需要加@service()注解】
package com.sxd.swapping.service.impl;
import com.sxd.swapping.dao.jpa.HuaYangAreaDao;
import com.sxd.swapping.dao.mybatis.HuaYangAreaMapper;
import com.sxd.swapping.domain.HuaYangArea;
import com.sxd.swapping.service.HuaYangService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Sort;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import java.util.List;
import java.util.Map;
@Service
public class HuaYangServiceImpl implements HuaYangService {
@Autowired
HuaYangAreaMapper huaYangAreaMapper;
@Override
public HuaYangArea getByUidWithMyBatis(String uid) {
return huaYangAreaMapper.findOne(uid);
}
@Override
public HuaYangArea insertWithMybatis(HuaYangArea huaYangArea) {
huaYangAreaMapper.insert(huaYangArea);
return huaYangAreaMapper.findOne(huaYangArea.getUid());
}
@Override
public HuaYangArea updateWithMyBatis(HuaYangArea huaYangArea) {
huaYangAreaMapper.update(huaYangArea);
return huaYangAreaMapper.selectById(huaYangArea.getId());
}
@Override
public void deleteWithMyBatis(Long id) {
huaYangAreaMapper.delete(id);
}
@Override
public HuaYangArea seleteWithMyBatis(Long id) {
return huaYangAreaMapper.selectById(id);
}
@Override
public List<HuaYangArea> selectLikeNameWithMyBatis(String areaName) {
return huaYangAreaMapper.selectByNameLike(areaName);
}
@Override
public List<HuaYangArea> selectLikeNameWithMyBatis2(String areaName) {
return huaYangAreaMapper.selectByNameLike2(areaName);
}
}
6.统一响应体
package com.sxd.swapping.base;
import com.sxd.swapping.util.MyException;
import lombok.Getter;
import lombok.Setter;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.BeanUtils;
import java.beans.PropertyDescriptor;
import java.io.Serializable;
import java.lang.reflect.Method;
import java.util.List;
@Getter
@Setter
public class UniVerResponse<T> implements Serializable {
private static final long serialVersionUID = 137671534756697880L;
/**
* 正确
*/
public static final int SUCCESS_REQUEST = 200;
/**
* 参数错误返回码
*/
public static final int ERROR_PARAMS = 100001;
/**
* 业务错误返回码
*/
public static final int ERROR_BUSINESS = 200001;
/**
* 系统异常返回码
*/
public static final int ERROR_SYS_EXCPTION = 500001;
private boolean success;
private String msg;
private int code;
private T obj;
public void beTrue(T obj){
this.success = true;
this.msg = "successful";
this.code = SUCCESS_REQUEST;
this.obj = obj;
}
public void beFalse(String msg,int code,T obj){
this.success = false;
this.msg = msg;
this.code = code;
this.obj = obj;
}
/**
* 对象多字段判空检查
* 例如simplCheckField(user,"userId","userName")
* @param obj 被检查的对象
* @param propertys 被检查对象中的字段 可多个
* @throws MyException
*/
public static void checkField(Object obj,String...propertys) throws MyException{
if(obj != null && propertys != null && propertys.length > 0){
//字节码
Class<? extends Object> clazz = obj.getClass();
//遍历所有属性
for (int i = 0; i < propertys.length; i++) {
String property = propertys[i];
//内省机制获取属性信息
PropertyDescriptor pd = BeanUtils.getPropertyDescriptor(clazz,property );
if(pd != null){
//获取当前字段的javabean读方法
Method readMethod = pd.getReadMethod();
if(readMethod != null){
Object invoke = null;
try {
invoke = readMethod.invoke(obj);
} catch (Exception e) {
throw new MyException("方法 "+ readMethod.getName() +"无法执行",UniVerResponse.ERROR_SYS_EXCPTION);
}
if(invoke != null){
//String类型单独处理
Class<?> propertyType = pd.getPropertyType();
if("java.lang.String".equals(propertyType.getName())){
if(StringUtils.isBlank((String)invoke)){
throw new MyException("错误 : [ " + property + " ] 不能为空!",UniVerResponse.ERROR_PARAMS);
}
}else if("java.util.List".equals(propertyType.getName())){
List list = (List)invoke;
if(list.size() == 0){
throw new MyException("错误 : [ " + property + " ] 不能为空!",UniVerResponse.ERROR_PARAMS);
}
}
}else{
throw new MyException("错误 : [ " + property + " ] 不能为空!",UniVerResponse.ERROR_PARAMS);
}
}else{
//抛出异常
throw new MyException("在 " + clazz +"中 找不到"+"[ " + property + " ] 的 读方法",UniVerResponse.ERROR_SYS_EXCPTION);
}
}else{
//抛出异常
throw new MyException("在 " + clazz +"中 找不到"+"[ " + property + " ] 属性",UniVerResponse.ERROR_SYS_EXCPTION);
}
}
}
}
/**
* 单一字段判空检查
* 可检查对象的单个属性判空 例如simplCheckField(user,"userId")
* 也可做某个变量的单独判空 例如simplCheckField(userId,"userId")
* @param obj 被检查的对象
* @param property 被检查的对象的字段
* @throws MyException
*/
public static void simplCheckField(Object obj,String property) throws MyException{
if(obj instanceof String){
if(StringUtils.isBlank((String)obj)){
throw new MyException("错误 : [ " + property + " ] 不能为空!",UniVerResponse.ERROR_PARAMS);
}
}else if(obj instanceof List){
List list = (List)obj;
if(list.size() == 0){
throw new MyException("错误 : [ " + property + " ] 不能为空!",UniVerResponse.ERROR_PARAMS);
}
}else{
if(obj == null){
throw new MyException("错误 : [ " + property + " ] 不能为空!",UniVerResponse.ERROR_PARAMS);
}
}
}
}
7.controller层调用即可
package com.sxd.swapping.controller;
import com.sxd.swapping.base.UniVerResponse;
import com.sxd.swapping.domain.HuaYangArea;
import com.sxd.swapping.service.HuaYangService;
import com.sxd.swapping.util.MyException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import java.util.List;
@RestController
@RequestMapping("/huayangMybatis")
public class HuaYangApiWithMyBatis {
@Autowired
HuaYangService huaYangService;
@PostMapping("/insert")
public UniVerResponse<HuaYangArea> insert(@RequestBody HuaYangArea huaYangArea){
UniVerResponse.checkField(huaYangArea,"areaName","areaPerson");
huaYangArea.initEntity();
UniVerResponse<HuaYangArea> response = new UniVerResponse<>();
try {
huaYangArea = huaYangService.insertWithMybatis(huaYangArea);
response.beTrue(huaYangArea);
}catch (Exception e){
throw new MyException("插入失败",UniVerResponse.ERROR_BUSINESS);
}
return response;
}
@PutMapping("/update")
public UniVerResponse<HuaYangArea> update(@RequestBody HuaYangArea huaYangArea){
UniVerResponse.checkField(huaYangArea,"id","areaName","areaPerson");
huaYangArea.updateEntity();
UniVerResponse<HuaYangArea> response = new UniVerResponse<>();
try {
huaYangArea = huaYangService.updateWithMyBatis(huaYangArea);
response.beTrue(huaYangArea);
}catch (Exception e){
throw new MyException("更新失败",UniVerResponse.ERROR_BUSINESS);
}
return response;
}
/**
* 不传入值的查询所有
* @param areaName
* @return
*/
@GetMapping("/findByNameLike")
public UniVerResponse<List<HuaYangArea>> findAll1(String areaName){
UniVerResponse<List<HuaYangArea>> response = new UniVerResponse<>();
try {
response.beTrue(huaYangService.selectLikeNameWithMyBatis(areaName));
}catch (Exception e){
e.printStackTrace();
throw new MyException("查询失败",UniVerResponse.ERROR_BUSINESS);
}
return response;
}
/**
* 不传入值 查不到结果
* @param areaName
* @return
*/
@GetMapping("/findByNameLike2")
public UniVerResponse<List<HuaYangArea>> findAll2(String areaName){
UniVerResponse<List<HuaYangArea>> response = new UniVerResponse<>();
try {
response.beTrue(huaYangService.selectLikeNameWithMyBatis2(areaName));
}catch (Exception e){
e.printStackTrace();
throw new MyException("查询失败",UniVerResponse.ERROR_BUSINESS);
}
return response;
}
/**
* 根据 业务主键获取
* @param uid
* @return
*/
@GetMapping(value = "/oneHuaYang")
public UniVerResponse<HuaYangArea> findOne(String uid){
UniVerResponse.simplCheckField(uid,"uid");
UniVerResponse<HuaYangArea> response = new UniVerResponse<>();
HuaYangArea huaYangArea = huaYangService.getByUidWithMyBatis(uid);
response.beTrue(huaYangArea);
return response;
}
/**
* 根据主键删除
* @param id
* @return
*/
@DeleteMapping(value = "/oneHuaYang")
public UniVerResponse<String> deleteOne(Long id ){
UniVerResponse.simplCheckField(id,"id");
UniVerResponse<String> response = new UniVerResponse<>();
huaYangService.deleteWithMyBatis(id);
response.beTrue("删除成功");
return response;
}
}
========================================================================================================
整体看下来单独采用Mapper映射类[实际是接口]中使用注解的方式，跟使用JPA很相似,但是没有JPA写起来代码量少
========================================================================================================
==========================映射文件方式======================
8.按照配置文件中的配置，在resources下创建mapper文件夹，并创建HuaYangAreaMapper.java同名的HuaYangAreaMapper.xml映射文件
注意，
<mapper namespace="com.sxd.swapping.dao.mybatis.HuaYangAreaMapper">
标签中 标明本mapper映射文件对应的是哪个Mapper类<select
id="findByNameAndPersonAndCreateDate"
parameterType="com.sxd.swapping.domain.HuaYangArea"
resultType="com.sxd.swapping.base.HuaYangModelBean">
每个sql语句是一个单独的标签，
查询有<select>
插入有<insert>
更新有<update>
删除有<delete>
标签基本属性
每一个id对应mapper类中的 一个方法名
parameterType属性标明sql接收的入参是什么类型
resultType属性标明sql操作结果的出参是什么类型
这里分别对应了两个实体类型select
hy.uid uid,
hy.create_date createDate,
hy.update_date updateDate,
hy.area_name areaName,
hy.area_person areaPerson
from
hua_yang_area AS hy
<where>
1=1
<if test="areaName != null">
AND hy.area_name LIKE '%' #{areaName} '%'
</if>
<if test="areaPerson != null">
AND hy.area_person >= #{areaPerson}
</if>
<if test="createDate != null">
AND <![CDATA[hy.create_date >= #{createDate}]]>
</if>
</where>
查询语句
select
数据表字段1 出参实体属性1，
数据表字段2 出参实体属性2
from
数据表名
where
if 入参实体属性1 !=null
数据表字段1 = 入参实体属性1
注意 时间类型的比较 转义字符的 处理完整代码如下：
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.sxd.swapping.dao.mybatis.HuaYangAreaMapper">
<select
id="findByNameAndPersonAndCreateDate"
parameterType="com.sxd.swapping.domain.HuaYangArea"
resultType="com.sxd.swapping.base.HuaYangModelBean">
select
hy.uid uid,
hy.create_date createDate,
hy.update_date updateDate,
hy.area_name areaName,
hy.area_person areaPerson
from
hua_yang_area AS hy
<where>
1=1
<if test="areaName != null">
AND hy.area_name LIKE '%' #{areaName} '%'
</if>
<if test="areaPerson != null">
AND hy.area_person >= #{areaPerson}
</if>
<if test="createDate != null">
AND <![CDATA[hy.create_date >= #{createDate}]]>
</if>
</where>
</select>
</mapper>
9.入参的实体类已经在最上面提供了，出参的Model
package com.sxd.swapping.base;
import lombok.Getter;
import lombok.Setter;
import java.util.Date;
/**
* mybatis 查询返回Model封装
*/
@Getter
@Setter
public class HuaYangModelBean {
private String uid;
private Date createDate;
private Date updateDate;
private String areaName;
private Long areaPerson;
}
10.Mapper映射类[实际是接口]中 就这个方法
11. 分别在service 和controller层调用即可【想看代码 可以看下面分页模块 顺便把这一部分的service层代码 和controller层代码贴出来了】
【这里有一个前台String类型传递给后台Date类型的错误：http://www.cnblogs.com/sxdcgaq8080/p/9055107.html】
==============================================================================================================
映射文件这种方式，就可以很肆意的写SQL了，但是这里考虑到一个问题就是不同数据库的sql语法可能有所不同，所以对于不同数据库的查询，这种方式可移植性就很劣势了。
===============================================================================================================
===========================pagehelper分页插件=====================
最后看一下mybatis分页插件的使用
12.如最上面所说的，分页jar包采用spring boot集成的这个，分页才有效
<!-- https://mvnrepository.com/artifact/com.github.pagehelper/pagehelper-spring-boot-starter mybatis分页插件-->
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper-spring-boot-starter</artifactId>
<version>1.2.5</version>
</dependency>
13.在application.properties增加pagehelper相关的配置
#pagehelper mybatis分页插件
pagehelper.helperDialect=mysql
pagehelper.reasonable=true
pagehelper.supportMethodsArguments=true
pagehelper.params=count=countSql
pagehelper.returnPageInfo=check
14.映射文件mapper.xml不变更，mapper映射类[实际是接口]依旧是上面的那个方法
15.service层新增一个返回PageInfo<实体>方法
import com.github.pagehelper.PageInfo;
List<HuaYangModelBean> findByNameAndPersonAndCreateDateWithMyBatisFile(HuaYangArea huaYangArea);
PageInfo<HuaYangModelBean> findByNameAndPersonAndCreateDateWithMyBatisFileAndpagehelper(HuaYangArea huaYangArea);service的实现
import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
@Override
public List<HuaYangModelBean> findByNameAndPersonAndCreateDateWithMyBatisFile(HuaYangArea huaYangArea) {
return huaYangAreaMapper.findByNameAndPersonAndCreateDate(huaYangArea);
}
@Override
public PageInfo<HuaYangModelBean> findByNameAndPersonAndCreateDateWithMyBatisFileAndpagehelper(HuaYangArea huaYangArea) {
PageHelper.startPage(huaYangArea.getPageNum(),huaYangArea.getPageSize());
List<HuaYangModelBean> list = huaYangAreaMapper.findByNameAndPersonAndCreateDate(huaYangArea);
PageInfo<HuaYangModelBean> pageInfo = new PageInfo<>(list);
return pageInfo;
}
16.设置分页统一响应体
package com.sxd.swapping.base;
import lombok.AllArgsConstructor;
import lombok.Getter;
import lombok.NoArgsConstructor;
import lombok.Setter;
import java.util.ArrayList;
import java.util.List;
/**
* 分页 统一响应体
* @param <T>
*/
@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
public class PageResponse<T> {
private boolean success;
private String msg;
private int code;
private int pageNum;
private int pageSize;
private long total;
private List<T> rows = new ArrayList<T>();
public void beTrue(long total,List<T> rows){
this.success = true;
this.msg = "successful";
this.code = UniVerResponse.SUCCESS_REQUEST;
this.total = total;
this.rows = rows;
}
public void beTrue(int pageNum,int pageSize,long total,List<T> rows){
this.success = true;
this.msg = "successful";
this.code = UniVerResponse.SUCCESS_REQUEST;
this.pageNum = pageNum;
this.pageSize = pageSize;
this.total = total;
this.rows = rows;
}
public void beFalse(String msg,int code){
this.success = false;
this.msg = msg;
this.code = code;
this.total = 0;
this.rows = null;
}
}
17.controller层调用
/**
* 根据 三个字段 查询
* 使用mybatis映射文件
* @param huaYangArea
* @return
*/
@GetMapping(value = "/findBy3")
public UniVerResponse<List<HuaYangModelBean>> findByNameAndPersonAndCreateDate(HuaYangArea huaYangArea){
UniVerResponse.checkField(huaYangArea,"areaName","areaPerson","createDate");
UniVerResponse<List<HuaYangModelBean>> response = new UniVerResponse<>();
try {
List<HuaYangModelBean> list = huaYangService.findByNameAndPersonAndCreateDateWithMyBatisFile(huaYangArea);
response.beTrue(list);
}catch (Exception e){
throw new MyException("查询错误",UniVerResponse.ERROR_BUSINESS,e);
}
return response;
}
/**
* 根据三个字段 映射文件 查询
*
* 分页查询
* @param huaYangArea
* @return
*/
@GetMapping(value = "/findBy3Page")
public PageResponse<HuaYangModelBean> findByNameAndPersonAndCreateDatePage(HuaYangArea huaYangArea){
UniVerResponse.checkField(huaYangArea,"areaName","areaPerson","createDate","pageNum","pageSize");
PageResponse<HuaYangModelBean> response = new PageResponse<>();
try {
PageInfo<HuaYangModelBean> pageInfo = huaYangService.findByNameAndPersonAndCreateDateWithMyBatisFileAndpagehelper(huaYangArea);
response.beTrue(pageInfo.getPageNum(),pageInfo.getPageSize(),pageInfo.getTotal(),pageInfo.getList());
}catch (Exception e){
throw new MyException("查询错误",UniVerResponse.ERROR_BUSINESS,e);
}
return response;
}
18.测试查询，分页 的pageNum = 0 和pageNum = 1都是返回第一页的数据
满足条件的 总共13条数据，
查询pageNum = 0 pageSize = 10
查询 参数如下：
查询语句打印日志如下：
2018-05-18 14:05:19.469 DEBUG 8188 --- [nio-9666-exec-8] H.findByNameAndPersonAndCreateDate_COUNT : ==> Preparing: select count(0) from (select hy.uid uid, hy.create_date createDate, hy.update_date updateDate, hy.area_name areaName, hy.area_person areaPerson from hua_yang_area AS hy WHERE 1=1 AND hy.area_name LIKE '%' ? '%' AND hy.area_person >= ? AND hy.create_date >= ?) tmp_count
2018-05-18 14:05:19.470 DEBUG 8188 --- [nio-9666-exec-8] H.findByNameAndPersonAndCreateDate_COUNT : ==> Parameters: 华阳(String), 7000(Long), 2018-05-16 00:00:00.0(Timestamp)
2018-05-18 14:05:19.471 DEBUG 8188 --- [nio-9666-exec-8] H.findByNameAndPersonAndCreateDate_COUNT : <== Total: 1
2018-05-18 14:05:19.472 DEBUG 8188 --- [nio-9666-exec-8] s.d.m.H.findByNameAndPersonAndCreateDate : ==> Preparing: select hy.uid uid, hy.create_date createDate, hy.update_date updateDate, hy.area_name areaName, hy.area_person areaPerson from hua_yang_area AS hy WHERE 1=1 AND hy.area_name LIKE '%' ? '%' AND hy.area_person >= ? AND hy.create_date >= ? LIMIT ?
2018-05-18 14:05:19.473 DEBUG 8188 --- [nio-9666-exec-8] s.d.m.H.findByNameAndPersonAndCreateDate : ==> Parameters: 华阳(String), 7000(Long), 2018-05-16 00:00:00.0(Timestamp), 10(Integer)
2018-05-18 14:05:19.476 DEBUG 8188 --- [nio-9666-exec-8] s.d.m.H.findByNameAndPersonAndCreateDate : <== Total: 10查询结果如下：
=============================================================================================================
查询pageNum = 1 pageSize = 10
查询 参数如下：
查询语句日志打印如下：
2018-05-18 14:03:38.142 DEBUG 8188 --- [nio-9666-exec-3] H.findByNameAndPersonAndCreateDate_COUNT : ==> Preparing: select count(0) from (select hy.uid uid, hy.create_date createDate, hy.update_date updateDate, hy.area_name areaName, hy.area_person areaPerson from hua_yang_area AS hy WHERE 1=1 AND hy.area_name LIKE '%' ? '%' AND hy.area_person >= ? AND hy.create_date >= ?) tmp_count
2018-05-18 14:03:38.143 DEBUG 8188 --- [nio-9666-exec-3] H.findByNameAndPersonAndCreateDate_COUNT : ==> Parameters: 华阳(String), 7000(Long), 2018-05-16 00:00:00.0(Timestamp)
2018-05-18 14:03:38.145 DEBUG 8188 --- [nio-9666-exec-3] H.findByNameAndPersonAndCreateDate_COUNT : <== Total: 1
2018-05-18 14:03:38.146 DEBUG 8188 --- [nio-9666-exec-3] s.d.m.H.findByNameAndPersonAndCreateDate : ==> Preparing: select hy.uid uid, hy.create_date createDate, hy.update_date updateDate, hy.area_name areaName, hy.area_person areaPerson from hua_yang_area AS hy WHERE 1=1 AND hy.area_name LIKE '%' ? '%' AND hy.area_person >= ? AND hy.create_date >= ? LIMIT ?
2018-05-18 14:03:38.147 DEBUG 8188 --- [nio-9666-exec-3] s.d.m.H.findByNameAndPersonAndCreateDate : ==> Parameters: 华阳(String), 7000(Long), 2018-05-16 00:00:00.0(Timestamp), 10(Integer)
2018-05-18 14:03:38.151 DEBUG 8188 --- [nio-9666-exec-3] s.d.m.H.findByNameAndPersonAndCreateDate : <== Total: 10结果都是下面这样：
显示pageNum 都是 为1
=============================================================================================================
查询pageNum = 2 pageSize = 10
查询参数如下：
查询语句日志打印如下：
2018-05-18 14:02:31.734 DEBUG 8188 --- [nio-9666-exec-1] H.findByNameAndPersonAndCreateDate_COUNT : ==> Preparing: select count(0) from (select hy.uid uid, hy.create_date createDate, hy.update_date updateDate, hy.area_name areaName, hy.area_person areaPerson from hua_yang_area AS hy WHERE 1=1 AND hy.area_name LIKE '%' ? '%' AND hy.area_person >= ? AND hy.create_date >= ?) tmp_count
2018-05-18 14:02:31.753 DEBUG 8188 --- [nio-9666-exec-1] H.findByNameAndPersonAndCreateDate_COUNT : ==> Parameters: 华阳(String), 7000(Long), 2018-05-16 00:00:00.0(Timestamp)
2018-05-18 14:02:31.766 DEBUG 8188 --- [nio-9666-exec-1] H.findByNameAndPersonAndCreateDate_COUNT : <== Total: 1
2018-05-18 14:02:31.772 DEBUG 8188 --- [nio-9666-exec-1] s.d.m.H.findByNameAndPersonAndCreateDate : ==> Preparing: select hy.uid uid, hy.create_date createDate, hy.update_date updateDate, hy.area_name areaName, hy.area_person areaPerson from hua_yang_area AS hy WHERE 1=1 AND hy.area_name LIKE '%' ? '%' AND hy.area_person >= ? AND hy.create_date >= ? LIMIT ?, ?
2018-05-18 14:02:31.772 DEBUG 8188 --- [nio-9666-exec-1] s.d.m.H.findByNameAndPersonAndCreateDate : ==> Parameters: 华阳(String), 7000(Long), 2018-05-16 00:00:00.0(Timestamp), 10(Integer), 10(Integer)
2018-05-18 14:02:31.774 DEBUG 8188 --- [nio-9666-exec-1] s.d.m.H.findByNameAndPersonAndCreateDate : <== Total: 3
查询结果如下：
=============================================================================================================
查询pageNum = 3 pageSize = 10
查询参数如下：
查询语句打印日志如下：
2018-05-18 14:11:52.633 DEBUG 8188 --- [nio-9666-exec-8] H.findByNameAndPersonAndCreateDate_COUNT : ==> Preparing: select count(0) from (select hy.uid uid, hy.create_date createDate, hy.update_date updateDate, hy.area_name areaName, hy.area_person areaPerson from hua_yang_area AS hy WHERE 1=1 AND hy.area_name LIKE '%' ? '%' AND hy.area_person >= ? AND hy.create_date >= ?) tmp_count
2018-05-18 14:11:52.634 DEBUG 8188 --- [nio-9666-exec-8] H.findByNameAndPersonAndCreateDate_COUNT : ==> Parameters: 华阳(String), 7000(Long), 2018-05-16 00:00:00.0(Timestamp)
2018-05-18 14:11:52.636 DEBUG 8188 --- [nio-9666-exec-8] H.findByNameAndPersonAndCreateDate_COUNT : <== Total: 1
2018-05-18 14:11:52.638 DEBUG 8188 --- [nio-9666-exec-8] s.d.m.H.findByNameAndPersonAndCreateDate : ==> Preparing: select hy.uid uid, hy.create_date createDate, hy.update_date updateDate, hy.area_name areaName, hy.area_person areaPerson from hua_yang_area AS hy WHERE 1=1 AND hy.area_name LIKE '%' ? '%' AND hy.area_person >= ? AND hy.create_date >= ? LIMIT ?, ?
2018-05-18 14:11:52.639 DEBUG 8188 --- [nio-9666-exec-8] s.d.m.H.findByNameAndPersonAndCreateDate : ==> Parameters: 华阳(String), 7000(Long), 2018-05-16 00:00:00.0(Timestamp), 10(Integer), 10(Integer)
2018-05-18 14:11:52.641 DEBUG 8188 --- [nio-9666-exec-8] s.d.m.H.findByNameAndPersonAndCreateDate : <== Total: 3查询结果如下：
==================================================================================
好了 spring boot 2.0+mybatis 暂时告一段落。
来源：oschina
链接：https://my.oschina.net/u/4265407/blog/3972914