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: