spring boot mybatis 整合教程
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2022-05-27 15:29:23
本项目使用的环境： 开发工具：Intellij IDEA 2017.1.3 springboot: 1.5.6 jdk：1.8.0_161 maven:3.3.9 额外功能 PageHelper 分页插件 mybatis generator 自动生成代码插件 步骤： 1. 创建一个springboo ......
本项目使用的环境：
- 开发工具：intellij idea 2017.1.3
- springboot: 1.5.6
- ：1.8.0_161
- maven:3.3.9
额外功能
- pagehelper 分页插件
- mybatis generator 自动生成代码插件
步骤：
1. 创建一个springboot项目：
2. 创建项目的文件结构以及jdk的版本
3. 选择项目所需要的依赖
然后点击finish
4. 看一下文件的结构：
5. 查看一下pom.xml：
1 <?xml version="1.0" encoding="utf-8"?>
2 <project xmlns="http://maven.apache.org/pom/4.0.0" xmlns:xsi="http://www.w3.org/2001/xmlschema-instance"
3 xsi:schemalocation="http://maven.apache.org/pom/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
4 <modelversion>4.0.0</modelversion>
5
6 <groupid>com.winter</groupid>
7 <artifactid>springboot-mybatis-demo</artifactid>
8 <version>0.0.1-snapshot</version>
9 <packaging>jar</packaging>
10
11 <name>springboot-mybatis-demo</name>
12 <description>demo project for spring boot</description>
13
14 <parent>
15 <groupid>org.springframework.boot</groupid>
16 <artifactid>spring-boot-starter-parent</artifactid>
17 <version>1.5.6.release</version>
18 <relativepath/> <!-- lookup parent from repository -->
19 </parent>
20
21 <properties>
22 <project.build.sourceencoding>utf-8</project.build.sourceencoding>
23 <project.reporting.outputencoding>utf-8</project.reporting.outputencoding>
24 <java.version>1.7</java.version>
25 </properties>
26
27 <dependencies>
28 <dependency>
29 <groupid>org.mybatis.spring.boot</groupid>
30 <artifactid>mybatis-spring-boot-starter</artifactid>
31 <version>1.3.0</version>
32 </dependency>
33 <dependency>
34 <groupid>org.springframework.boot</groupid>
35 <artifactid>spring-boot-starter-thymeleaf</artifactid>
36 </dependency>
37 <dependency>
38 <groupid>org.springframework.boot</groupid>
39 <artifactid>spring-boot-starter-web</artifactid>
40 </dependency>
41
42 <dependency>
43 <groupid>org.springframework.boot</groupid>
44 <artifactid>spring-boot-starter-test</artifactid>
45 <scope>test</scope>
46 </dependency>
47 <dependency>
48 <groupid>mysql</groupid>
49 <artifactid>mysql-connector-java</artifactid>
50 <version>5.1.35</version>
51 </dependency>
52
53
54 <dependency>
55 <groupid>com.fasterxml.jackson.core</groupid>
56 <artifactid>jackson-core</artifactid>
57 </dependency>
58 <dependency>
59 <groupid>com.fasterxml.jackson.core</groupid>
60 <artifactid>jackson-databind</artifactid>
61 </dependency>
62 <dependency>
63 <groupid>com.fasterxml.jackson.datatype</groupid>
64 <artifactid>jackson-datatype-joda</artifactid>
65 </dependency>
66 <dependency>
67 <groupid>com.fasterxml.jackson.module</groupid>
68 <artifactid>jackson-module-parameter-names</artifactid>
69 </dependency>
70 <!-- 分页插件 -->
71 <dependency>
72 <groupid>com.github.pagehelper</groupid>
73 <artifactid>pagehelper-spring-boot-starter</artifactid>
74 <version>1.1.2</version>
75 </dependency>
76 <!-- alibaba的druid数据库连接池 -->
77 <dependency>
78 <groupid>com.alibaba</groupid>
79 <artifactid>druid-spring-boot-starter</artifactid>
80 <version>1.1.0</version>
81 </dependency>
82 </dependencies>
83
84 <build>
85 <plugins>
86 <plugin>
87 <groupid>org.springframework.boot</groupid>
88 <artifactid>spring-boot-maven-plugin</artifactid>
89 </plugin>
90 <!-- mybatis generator 自动生成代码插件 -->
91 <plugin>
92 <groupid>org.mybatis.generator</groupid>
93 <artifactid>mybatis-generator-maven-plugin</artifactid>
94 <version>1.3.2</version>
95 <configuration>
96 <configurationfile>${basedir}/src/main/resources/generator/generatorconfig.xml</configurationfile>
97 <overwrite>true</overwrite>
98 <verbose>true</verbose>
99 </configuration>
100 </plugin>
101 </plugins>
102 </build>
103
104
105 </project>
6. 项目不使用application.properties文件 而使用更加简洁的application.yml文件：
将原有的resource文件夹下的application.properties文件删除，创建一个新的application.yml配置文件，
文件的内容如下：
1 server: 2 port: 8080 3 4 spring: 5 datasource: 6 name: test 7 url: jdbc:mysql://127.0.0.1:3306/depot 8 username: root 9 password: root 10 # 使用druid数据源 11 type: com.alibaba.druid.pool.druiddatasource 12 driver-class-name: com.mysql.jdbc.driver 13 filters: stat 14 maxactive: 20 15 initialsize: 1 16 maxwait: 60000 17 minidle: 1 18 timebetweenevictionrunsmillis: 60000 19 minevictableidletimemillis: 300000 20 validationquery: select 'x' 21 testwhileidle: true 22 testonborrow: false 23 testonreturn: false 24 poolpreparedstatements: true 25 maxopenpreparedstatements: 20 26 27 ## 该配置节点为独立的节点，有很多同学容易将这个配置放在spring的节点下，导致配置无法被识别 28 mybatis: 29 mapper-locations: classpath:mapping/*.xml #注意：一定要对应mapper映射xml文件的所在路径 30 type-aliases-package: com.winter.model # 注意：对应实体类的路径 31 32 #pagehelper分页插件 33 pagehelper: 34 helperdialect: mysql 35 reasonable: true 36 supportmethodsarguments: true 37 params: count=countsql
7. 创建数据库：
1 create database mytest; 2 3 create table t_user( 4 user_id int not null primary key auto_increment, 5 user_name varchar(255) not null , 6 password varchar(255) not null , 7 phone varchar(255) not null 8 ) engine=innodb auto_increment=1000 default charset=utf8;
8. 使用mybatis generator 自动生成代码：
- 配置pom.xml中generator 插件所对应的配置文件 ${basedir}/src/main/resources/generator/generatorconfig.xml
1 <?xml version="1.0" encoding="utf-8"?> 2 <!doctype generatorconfiguration 3 public "-//mybatis.org//dtd mybatis generator configuration 1.0//en" 4 "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd"> 5 <generatorconfiguration> 6 <!-- 数据库驱动:选择你的本地硬盘上面的数据库驱动包--> 7 <classpathentry location="e:\developer\mybatis-generator-core-1.3.2\lib\mysql-connector-java-5.1.25-bin.jar"/> 8 <context id="db2tables" targetruntime="mybatis3"> 9 <commentgenerator> 10 <property name="suppressdate" value="true"/> 11 <!-- 是否去除自动生成的注释 true：是 ： false:否 --> 12 <property name="suppressallcomments" value="true"/> 13 </commentgenerator> 14 <!--数据库链接url，用户名、密码 --> 15 <jdbcconnection driverclass="com.mysql.jdbc.driver" connectionurl="jdbc:mysql://127.0.0.1/mytest" userid="root" password="root"> 16 </jdbcconnection> 17 <javatyperesolver> 18 <property name="forcebigdecimals" value="false"/> 19 </javatyperesolver> 20 <!-- 生成模型的包名和位置--> 21 <javamodelgenerator targetpackage="com.winter.model" targetproject="src/main/java"> 22 <property name="enablesubpackages" value="true"/> 23 <property name="trimstrings" value="true"/> 24 </javamodelgenerator> 25 <!-- 生成映射文件的包名和位置--> 26 <sqlmapgenerator targetpackage="mapping" targetproject="src/main/resources"> 27 <property name="enablesubpackages" value="true"/> 28 </sqlmapgenerator> 29 <!-- 生成dao的包名和位置--> 30 <javaclientgenerator type="xmlmapper" targetpackage="com.winter.mapper" targetproject="src/main/java"> 31 <property name="enablesubpackages" value="true"/> 32 </javaclientgenerator> 33 <!-- 要生成的表 tablename是数据库中的表名或视图名 domainobjectname是实体类名--> 34 <table tablename="t_user" domainobjectname="user" enablecountbyexample="false" enableupdatebyexample="false" enabledeletebyexample="false" enableselectbyexample="false" selectbyexamplequeryid="false"></table> 35 </context> 36 </generatorconfiguration>
- 点击run-edit configurations
- 添加配置
-
运行
注意！！！同一张表一定不要运行多次，因为mapper的映射文件中会生成多次的代码，导致报错，切记
最后生成的文件以及结构：
9. 生成的文件
usermapper.java
1 package com.winter.mapper;
2
3 import com.winter.model.user;
4
5 public interface usermapper {
6 int deletebyprimarykey(integer userid);
7
8 int insert(user record);
9
10 int insertselective(user record);
11
12 user selectbyprimarykey(integer userid);
13
14 int updatebyprimarykeyselective(user record);
15
16 int updatebyprimarykey(user record);
17 //这个方式我自己加的
18 list<user> selectalluser();
19 }
user.java
1 package com.winter.model;
2
3 public class user {
4 private integer userid;
5
6 private string username;
7
8 private string password;
9
10 private string phone;
11
12 public integer getuserid() {
13 return userid;
14 }
15
16 public void setuserid(integer userid) {
17 this.userid = userid;
18 }
19
20 public string getusername() {
21 return username;
22 }
23
24 public void setusername(string username) {
25 this.username = username == null ? null : username.trim();
26 }
27
28 public string getpassword() {
29 return password;
30 }
31
32 public void setpassword(string password) {
33 this.password = password == null ? null : password.trim();
34 }
35
36 public string getphone() {
37 return phone;
38 }
39
40 public void setphone(string phone) {
41 this.phone = phone == null ? null : phone.trim();
42 }
43 }
对于sql语句这种黄色的背景，真心是看不下去了（解决方案）：
**usermapper.xml **
1 <?xml version="1.0" encoding="utf-8" ?>
2 <!doctype mapper public "-//mybatis.org//dtd mapper 3.0//en" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
3 <mapper namespace="com.winter.mapper.usermapper" >
4 <resultmap id="baseresultmap" type="com.winter.model.user" >
5 <id column="user_id" property="userid" jdbctype="integer" />
6 <result column="user_name" property="username" jdbctype="varchar" />
7 <result column="password" property="password" jdbctype="varchar" />
8 <result column="phone" property="phone" jdbctype="varchar" />
9 </resultmap>
10 <sql id="base_column_list" >
11 user_id, user_name, password, phone
12 </sql>
13 <select id="selectbyprimarykey" resultmap="baseresultmap" parametertype="java.lang.integer" >
14 select
15 <include refid="base_column_list" />
16 from t_user
17 where user_id = #{userid,jdbctype=integer}
18 </select>
19 <!-- 这个方法是我自己加的 -->
20 <select id="selectalluser" resultmap="baseresultmap">
21 select
22 <include refid="base_column_list" />
23 from t_user
24 </select>
25 <delete id="deletebyprimarykey" parametertype="java.lang.integer" >
26 delete from t_user
27 where user_id = #{userid,jdbctype=integer}
28 </delete>
29 <insert id="insert" parametertype="com.winter.model.user" >
30 insert into t_user (user_id, user_name, password,
31 phone)
32 values (#{userid,jdbctype=integer}, #{username,jdbctype=varchar}, #{password,jdbctype=varchar},
33 #{phone,jdbctype=varchar})
34 </insert>
35 <insert id="insertselective" parametertype="com.winter.model.user" >
36 insert into t_user
37 <trim prefix="(" suffix=")" suffixoverrides="," >
38 <if test="userid != null" >
39 user_id,
40 </if>
41 <if test="username != null" >
42 user_name,
43 </if>
44 <if test="password != null" >
45 password,
46 </if>
47 <if test="phone != null" >
48 phone,
49 </if>
50 </trim>
51 <trim prefix="values (" suffix=")" suffixoverrides="," >
52 <if test="userid != null" >
53 #{userid,jdbctype=integer},
54 </if>
55 <if test="username != null" >
56 #{username,jdbctype=varchar},
57 </if>
58 <if test="password != null" >
59 #{password,jdbctype=varchar},
60 </if>
61 <if test="phone != null" >
62 #{phone,jdbctype=varchar},
63 </if>
64 </trim>
65 </insert>
66 <update id="updatebyprimarykeyselective" parametertype="com.winter.model.user" >
67 update t_user
68 <set >
69 <if test="username != null" >
70 user_name = #{username,jdbctype=varchar},
71 </if>
72 <if test="password != null" >
73 password = #{password,jdbctype=varchar},
74 </if>
75 <if test="phone != null" >
76 phone = #{phone,jdbctype=varchar},
77 </if>
78 </set>
79 where user_id = #{userid,jdbctype=integer}
80 </update>
81 <update id="updatebyprimarykey" parametertype="com.winter.model.user" >
82 update t_user
83 set user_name = #{username,jdbctype=varchar},
84 password = #{password,jdbctype=varchar},
85 phone = #{phone,jdbctype=varchar}
86 where user_id = #{userid,jdbctype=integer}
87 </update>
88 </mapper>
10. 打开类springbootmybatisdemoapplication.java，这个是springboot的启动类。我们需要添加点东西：
1 package com.winter;
2
3 import org.mybatis.spring.annotation.mapperscan;
4 import org.springframework.boot.springapplication;
5 import org.springframework.boot.autoconfigure.springbootapplication;
6
7 @springbootapplication
8 @mapperscan("com.winter.mapper")//将项目中对应的mapper类的路径加进来就可以了
9 public class springbootmybatisdemoapplication {
10
11 public static void main(string[] args) {
12 springapplication.run(springbootmybatisdemoapplication.class, args);
13 }
14 }
注意：@mapperscan("com.winter.mapper")这个注解非常的关键，这个对应了项目中mapper（dao）所对应的包路径，很多同学就是这里忘了加导致异常的
11. 到这里所有的搭建工作都完成了，接下来就是测试的工作，没使用junit4进行测试：
首先看一下完成之后的文件的结构：
现在controller，service层的代码都写好：
usercontroller.java
1 package com.winter.controller;
2
3 import com.winter.model.user;
4 import com.winter.service.userservice;
5 import org.springframework.beans.factory.annotation.autowired;
6 import org.springframework.stereotype.controller;
7 import org.springframework.web.bind.annotation.pathvariable;
8 import org.springframework.web.bind.annotation.requestmapping;
9 import org.springframework.web.bind.annotation.responsebody;
10
11 /**
12 * created by administrator on 2017/8/16.
13 */
14 @controller
15 @requestmapping(value = "/user")
16 public class usercontroller {
17
18 @autowired
19 private userservice userservice;
20
21 @responsebody
22 @requestmapping(value = "/add", produces = {"application/json;charset=utf-8"})
23 public int adduser(user user){
24 return userservice.adduser(user);
25 }
26
27 @responsebody
28 @requestmapping(value = "/all/{pagenum}/{pagesize}", produces = {"application/json;charset=utf-8"})
29 public object findalluser(@pathvariable("pagenum") int pagenum, @pathvariable("pagesize") int pagesize){
30
31 return userservice.findalluser(pagenum,pagesize);
32 }
33 }
userservice.java
1 package com.winter.service;
2
3 import com.winter.model.user;
4
5 import java.util.list;
6
7 /**
8 * created by administrator on 2017/8/16.
9 */
10 public interface userservice {
11
12 int adduser(user user);
13
14 list<user> findalluser(int pagenum, int pagesize);
15 }
userserviceimpl.java
1 package com.winter.service.impl;
2
3 import com.github.pagehelper.pagehelper;
4 import com.winter.mapper.usermapper;
5 import com.winter.model.user;
6 import com.winter.service.userservice;
7 import org.springframework.beans.factory.annotation.autowired;
8 import org.springframework.stereotype.service;
9
10 import java.util.list;
11
12 /**
13 * created by administrator on 2017/8/16.
14 */
15 @service(value = "userservice")
16 public class userserviceimpl implements userservice {
17
18 @autowired
19 private usermapper usermapper;//这里会报错，但是并不会影响
20
21 @override
22 public int adduser(user user) {
23
24 return usermapper.insertselective(user);
25 }
26
27 /*
28 * 这个方法中用到了我们开头配置依赖的分页插件pagehelper
29 * 很简单，只需要在service层传入参数，然后将参数传递给一个插件的一个静态方法即可；
30 * pagenum 开始页数
31 * pagesize 每页显示的数据条数
32 * */
33 @override
34 public list<user> findalluser(int pagenum, int pagesize) {
35 //将参数传给这个方法就可以实现物理分页了，非常简单。
36 pagehelper.startpage(pagenum, pagesize);
37 return usermapper.selectalluser();
38 }
39 }
如果强迫症看不下去那个报错：（解决方法）
测试我使用了idea一个很用心的功能。
可以发http请求的插件：
点击左侧的运行按钮就可以发送请求了；
如果返回值正确 说明你已经搭建成功了！！
ps：如果出现mapper注入不了的情况，请检查版本，当前博客的搭建方法只适合1.5.*版本的。
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