1. 程式人生 > >SpringBoot入門篇--整合mybatis+generator自動生成程式碼+druid連線池+PageHelper分頁外掛

SpringBoot入門篇--整合mybatis+generator自動生成程式碼+druid連線池+PageHelper分頁外掛

我們這一一篇部落格講的是如何整合Springboot和Mybatis框架,然後使用generator自動生成mapper,pojo等檔案。然後再使用阿里巴巴提供的開源連線池druid,這個連線池的好處我就不說了,集合了所有連線池的好處,並且還提供了監控等功能,加大了可擴充套件性等等。

  1. 建立一個springboot專案:

 

 2.可以看到的是我們除了引入web依賴之外還引入了三個依賴,分別是MySQL,JDBC,Mybatis,我們如下觀看一下完整的依賴情況:    

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  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依賴-->
 34         <dependency>
 35             <groupId>org.springframework.boot</groupId>
 36             <artifactId>spring-boot-starter-web</artifactId>
 37         </dependency>
 38 
 39         <!--這個依賴已經包括JDBC依賴-->
 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         <!--資料庫連線-->
 47         <dependency>
 48             <groupId>mysql</groupId>
 49             <artifactId>mysql-connector-java</artifactId>
 50             <scope>runtime</scope>
 51         </dependency>
 52 
 53         <!--需要手動新增的依賴-->
 54         <!--使用durid連線池的依賴-->
 55         <dependency>
 56             <groupId>com.alibaba</groupId>
 57             <artifactId>druid-spring-boot-starter</artifactId>
 58             <version>1.1.1</version>
 59         </dependency>
 60   
 61     <!--熱部署依賴-->
 62     <dependency>
 63        <groupId>org.springframework.boot</groupId>
 64        <artifactId>spring-boot-devtools</artifactId>
 65     </dependency>
 66 
 67     <!--thymeleaf依賴-->
 68     <dependency>
 69        <groupId>org.springframework.boot</groupId>
 70        <artifactId>spring-boot-starter-thymeleaf</artifactId>
 71     </dependency>
 72 
 73 
 74         <!-- 分頁外掛 -->
 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 自動生成程式碼外掛 -->
 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>

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 3.依賴引入完成以後我們再對application.properties配置檔案進行編輯:  

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 1 #設定訪問埠
 2 server.port=80
 3 
 4 #thymeleaf配置,這裡是可以省略的,因為預設配置已經足夠
 5 #關閉快取,及時重新整理頁面,這一點很重要
 6 spring.thymeleaf.cache=false
 7 #註釋的部分是Thymeleaf預設的配置,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 #設定熱部署
16 #開啟熱部署
17 spring.devtools.restart.enabled=true
18 #重啟範圍
19 spring.devtools.restart.additional-paths=src/main/java
20 
21 #設定資料來源
22 #資料庫連線使用者名稱
23 spring.datasource.username=root
24 #資料庫連線密碼
25 spring.datasource.password=123
26 #驅動
27 spring.datasource.driver-class-name= com.mysql.jdbc.Driver
28 #資料庫連線路徑
29 spring.datasource.url=jdbc:mysql://localhost:3306/bysj
30 #連線池型別
31 spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
32 
33 #連線池配置,因為springboot預設是開啟了連線池的,它有預設配置,這一段可以忽略
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 # 配置獲取連線等待超時的時間
39 spring.datasource.maxWait=60000
40 # 配置間隔多久才進行一次檢測,檢測需要關閉的空閒連線,單位是毫秒
41 spring.datasource.timeBetweenEvictionRunsMillis=60000
42 # 配置一個連線在池中最小生存的時間,單位是毫秒
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 # 開啟PSCache,並且指定每個連線上PSCache的大小
49 spring.datasource.poolPreparedStatements=true
50 spring.datasource.maxPoolPreparedStatementPerConnectionSize=20
51 # 配置監控統計攔截的filters,去掉後監控介面sql無法統計,'wall'用於防火牆
52 spring.datasource.filters=stat,wall,log4j
53 # 通過connectProperties屬性來開啟mergeSql功能;慢SQL記錄
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 #全域性的對映,不用在xml檔案寫實體類的全路徑
59 mybatis.type-aliases-package=com.zsl.pojo
60 #開啟駝峰對映
  mybatis.configuration.map-underscore-to-camel-case=true
61 #配置分頁外掛
62 #pagehelper分頁外掛
  pagehelper.helper-dialect=mysql
  pagehelper.reasonable=true
  pagehelper.support-methods-arguments=true
  pagehelper.params=count=countSql
 

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 4. 配置generator自動生成程式碼:檔案放置的位置就在pom.xml檔案裡面一如外掛的位置${basedir}/src/main/resources/generator/generatorConfig.xml

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 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     <!-- 資料庫驅動:選擇你的本地硬碟上面的資料庫驅動包-->
 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             <!-- 是否去除自動生成的註釋 true:是 : false:否 -->
12             <property name="suppressAllComments" value="true"/>
13         </commentGenerator>
14         <!--資料庫連結URL,使用者名稱、密碼 -->
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         <!-- 生成對映檔案的包名和位置-->
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是資料庫中的表名或檢視名 domainObjectName是實體類名-->
34         <table tableName="user" domainObjectName="User" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>
35     </context>
36 </generatorConfiguration>

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  5.建立資料庫以及表格  

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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;

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  6. 操作IDEA生成程式碼:Run-->Edit Configurations

  

  回到下圖所示頁面的時候點選三角即可:

  

  7.檢視專案情況以及生成程式碼:

    7.1:生成的mapper:

     

    7.2:生成的pojo實體類:

     

     7.3生成的mapper的xml檔案:在這裡務必要注意namespace是否正確,請注意檢視這一點

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 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>
   <!--自己寫的-->
   <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>

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    7.4專案的總體結構:

    

    7.5 自己用於測試分頁,駝峰對映,實體類對映等配置的controller,service

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 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     //增加使用者
19     @ResponseBody
20     @RequestMapping("/insertUser")
21     public String insertUser(User user){
22         return userService.insertUser(user);
23     }
24 
25     //查詢所有的使用者
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 }

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 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;//報錯不影響
16     /*
17     * 增加/修改使用者
18     * */
19     @Override
20     public String insertUser(User user) {
21         //增加使用者
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 }

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 注意:在實驗的時候務必要在啟動類上加上MapperScna註解,指定掃描mapper檔案,或者可以在每個mapper檔案上加mapper註解,不過這樣太麻煩了: