SpringBoot入门篇--整合mybatis+generator自动生成代码+druid连接池+PageHelper分页插件

  我们这一一篇博客讲的是如何整合Springboot和Mybatis框架,然后使用generator自动生成mapper,pojo等文件。然后再使用阿里巴巴提供的开源连接池druid,这个连接池的好处我就不说了,集合了所有连接池的好处,并且还提供了监控等功能,加大了可扩展性等等。

  1. 创建一个springboot项目:

 

 2.可以看到的是我们除了引入web依赖之外还引入了三个依赖,分别是MySQL,JDBC,Mybatis,我们如下观看一下完整的依赖情况:    

  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.example</groupId>
  7     <artifactId>springboot-mybatis02</artifactId>
  8     <version>0.0.1-SNAPSHOT</version>
  9     <packaging>jar</packaging>
 10 
 11     <name>springboot-mybatis02</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>2.0.1.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>1.8</java.version>
 25     </properties>
 26 
 27     <dependencies>
 28         <dependency>
 29             <groupId>org.springframework.boot</groupId>
 30             <artifactId>spring-boot-starter-jdbc</artifactId>
 31         </dependency>
 32 
 33         <!--web依赖-->
 34         <dependency>
 35             <groupId>org.springframework.boot</groupId>
 36             <artifactId>spring-boot-starter-web</artifactId>
 37         </dependency>
 38 
 39         <!--这个依赖已经包括JDBC依赖-->
 40         <dependency>
 41             <groupId>org.mybatis.spring.boot</groupId>
 42             <artifactId>mybatis-spring-boot-starter</artifactId>
 43             <version>1.3.2</version>
 44         </dependency>
 45 
 46         <!--数据库连接-->
 47         <dependency>
 48             <groupId>mysql</groupId>
 49             <artifactId>mysql-connector-java</artifactId>
 50             <scope>runtime</scope>
 51         </dependency>
 52 
 53         <!--需要手动添加的依赖-->
 54         <!--使用durid连接池的依赖-->
 55         <dependency>
 56             <groupId>com.alibaba</groupId>
 57             <artifactId>druid-spring-boot-starter</artifactId>
 58             <version>1.1.1</version>
 59         </dependency>
 60   
 61     <!--热部署依赖-->
 62     <dependency>
 63        <groupId>org.springframework.boot</groupId>
 64        <artifactId>spring-boot-devtools</artifactId>
 65     </dependency>
 66 
 67     <!--thymeleaf依赖-->
 68     <dependency>
 69        <groupId>org.springframework.boot</groupId>
 70        <artifactId>spring-boot-starter-thymeleaf</artifactId>
 71     </dependency>
 72 
 73 
 74         <!-- 分页插件 -->
 75         <dependency>
 76             <groupId>com.github.pagehelper</groupId>
 77             <artifactId>pagehelper-spring-boot-starter</artifactId>
 78             <version>4.1.6</version>
 79         </dependency>
 80 
 81         <dependency>
 82             <groupId>org.springframework.boot</groupId>
 83             <artifactId>spring-boot-starter-test</artifactId>
 84             <scope>test</scope>
 85         </dependency>
 86     </dependencies>
 87 
 88     <build>
 89         <plugins>
 90             <plugin>
 91                 <groupId>org.springframework.boot</groupId>
 92                 <artifactId>spring-boot-maven-plugin</artifactId>
 93             </plugin>
 94 
 95             <!-- mybatis generator 自动生成代码插件 -->
 96             <plugin>
 97                 <groupId>org.mybatis.generator</groupId>
 98                 <artifactId>mybatis-generator-maven-plugin</artifactId>
 99                 <version>1.3.2</version>
100                 <configuration>
101                     <configurationFile>${basedir}/src/main/resources/generator/generatorConfig.xml</configurationFile>
102                     <overwrite>true</overwrite>
103                     <verbose>true</verbose>
104                 </configuration>
105             </plugin>
106         </plugins>
107     </build>
108 
109 
110 </project>

 3.依赖引入完成以后我们再对application.properties配置文件进行编辑:  

 1 #设置访问端口
 2 server.port=80
 3 
 4 #thymeleaf配置,这里是可以省略的,因为默认配置已经足够
 5 #关闭缓存,及时刷新页面,这一点很重要
 6 spring.thymeleaf.cache=false
 7 #注释的部分是Thymeleaf默认的配置,如有其它需求可以自行更改
 8 #spring.thymeleaf.prefix=classpath:/templates/
 9 #spring.thymeleaf.suffix=.html
10 #spring.thymeleaf.mode=HTML5
11 #spring.thymeleaf.encoding=UTF-8
12 #spring.thymeleaf.servlet.content-type=text/html
13 
14 
15 #设置热部署
16 #开启热部署
17 spring.devtools.restart.enabled=true
18 #重启范围
19 spring.devtools.restart.additional-paths=src/main/java
20 
21 #设置数据源
22 #数据库连接用户名
23 spring.datasource.username=root
24 #数据库连接密码
25 spring.datasource.password=123
26 #驱动
27 spring.datasource.driver-class-name= com.mysql.jdbc.Driver
28 #数据库连接路径
29 spring.datasource.url=jdbc:mysql://localhost:3306/bysj
30 #连接池类型
31 spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
32 
33 #连接池配置,因为springboot默认是开启了连接池的,它有默认配置,这一段可以忽略
34 # 初始化大小,最小,最大
35 spring.datasource.initialSize=5
36 spring.datasource.minIdle=5
37 spring.datasource.maxActive=20
38 # 配置获取连接等待超时的时间
39 spring.datasource.maxWait=60000
40 # 配置间隔多久才进行一次检测,检测需要关闭的空闲连接,单位是毫秒
41 spring.datasource.timeBetweenEvictionRunsMillis=60000
42 # 配置一个连接在池中最小生存的时间,单位是毫秒
43 spring.datasource.minEvictableIdleTimeMillis=300000
44 spring.datasource.validationQuery=SELECT 1 FROM DUAL
45 spring.datasource.testWhileIdle=true
46 spring.datasource.testOnBorrow=false
47 spring.datasource.testOnReturn=false
48 # 打开PSCache,并且指定每个连接上PSCache的大小
49 spring.datasource.poolPreparedStatements=true
50 spring.datasource.maxPoolPreparedStatementPerConnectionSize=20
51 # 配置监控统计拦截的filters,去掉后监控界面sql无法统计,'wall'用于防火墙
52 spring.datasource.filters=stat,wall,log4j
53 # 通过connectProperties属性来打开mergeSql功能;慢SQL记录
54 spring.datasource.connectionProperties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500
55 
56 #配置mybatis
57 mybatis.mapper-location=classpath:mapping/*.xml
58 #全局的映射,不用在xml文件写实体类的全路径
59 mybatis.type-aliases-package=com.zsl.pojo
60 #开启驼峰映射
  mybatis.configuration.map-underscore-to-camel-case=true
61 #配置分页插件 62 #pagehelper分页插件   pagehelper.helper-dialect=mysql
  pagehelper.reasonable=true
  pagehelper.support-methods-arguments=true
  pagehelper.params=count=countSql

 4. 配置generator自动生成代码:文件放置的位置就在pom.xml文件里面一如插件的位置${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="C:\mysql-connector-java-5.1.41.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://localhost/bysj" userId="root" password="123">
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.zsl.pojo" 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.zsl.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="user" domainObjectName="User" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>
35     </context>
36 </generatorConfiguration>

  5.创建数据库以及表格  

CREATE DATABASE bysj;

CREATE TABLE user(
  user_id INT NOT NULL PRIMARY KEY AUTO_INCREMENT,
  user_name VARCHAR(255) NOT NULL ,
  password VARCHAR(255) NOT NULL ,
  phone VARCHAR(255) NOT NULL
) ENGINE=INNODB AUTO_INCREMENT=1000 DEFAULT CHARSET=utf8;

 

  6. 操作IDEA生成代码:Run-->Edit Configurations

  

  回到下图所示页面的时候点击三角即可:

  

  7.查看项目情况以及生成代码:

    7.1:生成的mapper:

     

    7.2:生成的pojo实体类:

     

     7.3生成的mapper的xml文件:在这里务必要注意namespace是否正确,请注意查看这一点

 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.zsl.mapper.UserMapper" >
 4   <resultMap id="BaseResultMap" type="com.zsl.pojo.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>
   <!--自己写的-->
   <select id="selectAllUser" resultType="user">
     select
    <include refid="Base_Column_List" />
    from user;
   </select>
13 <select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.Integer" > 14 select 15 <include refid="Base_Column_List" /> 16 from user 17 where user_id = #{userId,jdbcType=INTEGER} 18 </select> 19 <delete id="deleteByPrimaryKey" parameterType="java.lang.Integer" > 20 delete from user 21 where user_id = #{userId,jdbcType=INTEGER} 22 </delete> 23 <insert id="insert" parameterType="com.zsl.pojo.User" > 24 insert into user (user_id, user_name, password, 25 phone) 26 values (#{userId,jdbcType=INTEGER}, #{userName,jdbcType=VARCHAR}, #{password,jdbcType=VARCHAR}, 27 #{phone,jdbcType=VARCHAR}) 28 </insert> 29 <insert id="insertSelective" parameterType="com.zsl.pojo.User" > 30 insert into user 31 <trim prefix="(" suffix=")" suffixOverrides="," > 32 <if test="userId != null" > 33 user_id, 34 </if> 35 <if test="userName != null" > 36 user_name, 37 </if> 38 <if test="password != null" > 39 password, 40 </if> 41 <if test="phone != null" > 42 phone, 43 </if> 44 </trim> 45 <trim prefix="values (" suffix=")" suffixOverrides="," > 46 <if test="userId != null" > 47 #{userId,jdbcType=INTEGER}, 48 </if> 49 <if test="userName != null" > 50 #{userName,jdbcType=VARCHAR}, 51 </if> 52 <if test="password != null" > 53 #{password,jdbcType=VARCHAR}, 54 </if> 55 <if test="phone != null" > 56 #{phone,jdbcType=VARCHAR}, 57 </if> 58 </trim> 59 </insert> 60 <update id="updateByPrimaryKeySelective" parameterType="com.zsl.pojo.User" > 61 update user 62 <set > 63 <if test="userName != null" > 64 user_name = #{userName,jdbcType=VARCHAR}, 65 </if> 66 <if test="password != null" > 67 password = #{password,jdbcType=VARCHAR}, 68 </if> 69 <if test="phone != null" > 70 phone = #{phone,jdbcType=VARCHAR}, 71 </if> 72 </set> 73 where user_id = #{userId,jdbcType=INTEGER} 74 </update> 75 <update id="updateByPrimaryKey" parameterType="com.zsl.pojo.User" > 76 update user 77 set user_name = #{userName,jdbcType=VARCHAR}, 78 password = #{password,jdbcType=VARCHAR}, 79 phone = #{phone,jdbcType=VARCHAR} 80 where user_id = #{userId,jdbcType=INTEGER} 81 </update> 82 </mapper>

    7.4项目的总体结构:

    

    7.5 自己用于测试分页,驼峰映射,实体类映射等配置的controller,service

 1 package com.zsl.controller;
 2 
 3 import com.zsl.pojo.User;
 4 import com.zsl.service.impl.UserServiceImpl;
 5 import org.springframework.stereotype.Controller;
 6 import org.springframework.web.bind.annotation.RequestMapping;
 7 import org.springframework.web.bind.annotation.ResponseBody;
 8 
 9 import javax.annotation.Resource;
10 import java.util.List;
11 
12 @Controller
13 public class Userontroller {
14 
15     @Resource
16     private UserServiceImpl userService;
17 
18     //增加用户
19     @ResponseBody
20     @RequestMapping("/insertUser")
21     public String insertUser(User user){
22         return userService.insertUser(user);
23     }
24 
25     //查询所有的用户
26     @ResponseBody
27     @RequestMapping("/selectAllUser")
28     public String getAllUser(){
29         List<User> list = userService.selectAllUser();
30         System.out.println(list.size());
31         System.out.println(list);
32         System.out.println(list.get(1).getUserId());
33         return null;
34     }
35 }

 1 package com.zsl.service.impl;
 2 
 3 import com.zsl.mapper.UserMapper;
 4 import com.zsl.pojo.User;
 5 import com.zsl.service.UserService;
 6 import org.springframework.beans.factory.annotation.Autowired;
 7 import org.springframework.stereotype.Service;
 8 
 9 import java.util.List;
10 
11 @Service
12 public class UserServiceImpl implements UserService {
13 
14     @Autowired
15     private UserMapper userMapper;//报错不影响
16     /*
17     * 增加/修改用户
18     * */
19     @Override
20     public String insertUser(User user) {
21         //增加用户
22         if(user.getUserId() == null){
23             Integer i = userMapper.insert(user);
24             if(i != 0 && i != null){
25                 return "success";
26             }
27         }
28         return null;
29     }
30 
31     @Override
32     public List<User> selectAllUser() {
33         //PageHelper.startPage(1, 3);
34         List<User> list = userMapper.selectAllUser();
35         return list;
36     }
37 }

 注意:在实验的时候务必要在启动类上加上MapperScna注解,指定扫描mapper文件,或者可以在每个mapper文件上加mapper注解,不过这样太麻烦了: 

 

posted @ 2018-04-10 15:27  GoNewLife  阅读(18869)  评论(2编辑  收藏  举报