一、Mybatis简介
MyBatis是一个优秀的持久层框架，它对jdbc的操作数据库的过程进行封装，使开发者只需要关注 SQL 本身，而不需要花费精力去处理例如注册驱动、创建connection、创建statement、手动设置参数、结果集检索等jdbc繁杂的过程代码。
MyBatis让程序将主要精力放在sql上，通过mybatis提供的映射方式，自由灵活生成（半自动化，大部分需要程序员编写sql）满足需要sql语句，这比Hibernate、NHibernate以及EF等重量级ORM框架生成的SQL语句要搞笑很多。
MyBatis可以将向 preparedStatement中的输入参数自动进行输入映射，将查询结果集灵活映射成java对象。
Mybatis通过xml或注解的方式将要执行的各种statement（statement、preparedStatemnt、CallableStatement）配置起来，并通过java对象和statement中的sql进行映射生成最终执行的sql语句，最后由mybatis框架执行sql并将结果映射成java对象并返回。
二、Druid简介
Druid是阿里巴巴开源平台上一个数据库连接池实现，它结合了C3P0、DBCP、PROXOOL等DB池的优点，同时加入了日志监控，可以很好的监控DB池连接和SQL的执行情况，可以说是针对监控而生的DB连接池，据说是目前最好的连接池。
三、项目配置
1、项目结构
2、db.properties
jdbc.driverClassName=com.mysql.jdbc.Driver jdbc.url=jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&useSSL=true&serverTimezone=GMT%2B8 jdbc.username=root jdbc.password=yan748712
3、web.xml
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd" > <web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0"> <display-name>upms-server</display-name> <!-- Spring的配置--> <context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath*:spring-servlet.xml</param-value> </context-param> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <!-- springMVC的核心控制器 --> <servlet> <servlet-name>springMVC</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath*:springMVC-servlet.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>springMVC</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> <!-- druid --> <servlet> <servlet-name>DruidStatView</servlet-name> <servlet-class>com.alibaba.druid.support.http.StatViewServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>DruidStatView</servlet-name> <url-pattern>/druid/*</url-pattern> </servlet-mapping> <filter> <filter-name>druidWebStatFilter</filter-name> <filter-class>com.alibaba.druid.support.http.WebStatFilter</filter-class> <init-param> <param-name>exclusions</param-name> <param-value>/public/*,*.js,*.css,/druid*,*.jsp,*.swf</param-value> </init-param> <init-param> <param-name>principalSessionName</param-name> <param-value>sessionInfo</param-value> </init-param> <init-param> <param-name>profileEnable</param-name> <param-value>true</param-value> </init-param> </filter> <filter-mapping> <filter-name>druidWebStatFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> </web-app>
4、spring-servlet.xml
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd "> <bean id="propertyConfigure" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"> <property name="locations"> <list> <value>classpath*:db.properties</value> </list> </property> </bean> <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close"> <property name="driverClassName" value="${jdbc.driverClassName}" /> <property name="url" value="${jdbc.url}" /> <property name="username" value="${jdbc.username}" /> <property name="password" value="${jdbc.password}" /> <!-- 配置初始化大小、最小、最大 --> <property name="initialSize" value="1" /> <property name="minIdle" value="1" /> <property name="maxActive" value="10" /> <!-- 配置获取连接等待超时的时间 --> <property name="maxWait" value="10000" /> <!-- 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 --> <property name="timeBetweenEvictionRunsMillis" value="60000" /> <!-- 配置一个连接在池中最小生存的时间，单位是毫秒 --> <property name="minEvictableIdleTimeMillis" value="300000" /> <property name="testWhileIdle" value="true" /> <!-- 这里建议配置为TRUE，防止取到的连接不可用 --> <property name="testOnBorrow" value="true" /> <property name="testOnReturn" value="false" /> <!-- 打开PSCache，并且指定每个连接上PSCache的大小 --> <property name="poolPreparedStatements" value="true" /> <property name="maxPoolPreparedStatementPerConnectionSize" value="20" /> <!-- 这里配置提交方式，默认就是TRUE，可以不用配置 --> <property name="defaultAutoCommit" value="true" /> <!-- 验证连接有效与否的SQL，不同的数据配置不同 --> <property name="validationQuery" value="select 1 " /> <property name="filters" value="stat" /> </bean> <!-- 配置MyBatis的SqlSession --> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="dataSource" /> <!-- 配置MyBatis的配置的文件 --> <property name="configLocation" value="classpath:mybatis.xml"></property> <property name="typeAliasesPackage" value="com.ework.upms.entity"></property> <!-- 指定Mybatis映射文件，*.xml 会匹配所有xml文件 --> <property name="mapperLocations" value="classpath:mapper/*.xml"></property> </bean> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="basePackage" value="com.ework.upms.server.mapper" /> <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property> </bean> <!-- 开启事务 --> <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="dataSource" /> </bean> <!-- 可通过注解控制事务 --> <tx:annotation-driven transaction-manager="transactionManager" /> </beans>
5、springMVC-servlet.xml
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd"> <!-- 下面是配置扫描包的位置,包名为com.ework.upms.server,也就是说,我们的试图解析器应该放在com.ework.upms.server包下. --> <context:component-scan base-package="com.ework.upms.server"/> <mvc:annotation-driven /> <mvc:resources location="/static/" mapping="/static/**" /> <!-- 处理静态资源文件，303校验等等（标配，必须写） --> <mvc:default-servlet-handler/> <!-- Thymeleaf 视图解析器 --> <bean id="viewResolver" class="org.thymeleaf.spring4.view.ThymeleafViewResolver"> <property name="templateEngine" ref="templateEngine" /> <property name="characterEncoding" value="UTF-8" /> </bean> <!-- 模板解析器 --> <bean id="templateResolver" class="org.thymeleaf.spring4.templateresolver.SpringResourceTemplateResolver"> <property name="prefix" value="/WEB-INF/templates/" /> <property name="suffix" value=".html" /> <property name="templateMode" value="HTML5" /> <property name="cacheable" value="false" /> </bean> <!-- 模板引擎 --> <bean id="templateEngine" class="org.thymeleaf.spring4.SpringTemplateEngine"> <property name="templateResolver" ref="templateResolver" /> </bean> </beans>
6、父pom.xml
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.ework</groupId> <artifactId>ework-upms</artifactId> <packaging>pom</packaging> <version>1.0.0</version> <modules> <module>ework-upms-server</module> <module>ework-upms-client</module> <module>ework-upms-rpc-api</module> <module>ework-common</module> <module>ework-upms-rpc-service</module> <module>ework-upms-entity</module> </modules> <properties> <ework-upms.version>1.0.0</ework-upms.version> <spring.version>4.3.20.RELEASE</spring.version> <thymeleaf.version>3.0.6.RELEASE</thymeleaf.version> <!--mybatis相关--> <mybatis.version>3.4.6</mybatis.version> <mybatis-spring.version>1.3.1</mybatis-spring.version> <mysql.version>5.1.40</mysql.version> <pagehelper.version>5.1.2</pagehelper.version> <druid.version>1.0.29</druid.version> </properties> <!-- 依赖声明 --> <dependencyManagement> <dependencies> <!-- SpringMVC 依赖配置--> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>${spring.version}</version> </dependency> <!-- SpringMVC 依赖配置--> <!-- Thymeleaf 依赖配置--> <dependency> <groupId>org.thymeleaf</groupId> <artifactId>thymeleaf-spring4</artifactId> <version>${thymeleaf.version}</version> </dependency> <!-- Thymeleaf 依赖配置--> <!--数据访问相关配置--> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-tx</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>${mybatis.version}</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>${mysql.version}</version> </dependency> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>${mybatis-spring.version}</version> </dependency> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>${druid.version}</version> </dependency> <dependency> <groupId>com.github.pagehelper</groupId> <artifactId>pagehelper</artifactId> <version>${pagehelper.version}</version> </dependency> <!--数据访问相关配置--> <dependency> <groupId>com.ework</groupId> <artifactId>ework-upms-entity</artifactId> <version>${ework-upms.version}</version> </dependency> </dependencies> </dependencyManagement> </project>
7、pom.xml
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <parent> <artifactId>ework-upms</artifactId> <groupId>com.ework</groupId> <version>1.0.0</version> </parent> <modelVersion>4.0.0</modelVersion> <artifactId>ework-upms-server</artifactId> <packaging>war</packaging> <name>ework-upms-server Maven Webapp</name> <!-- FIXME change it to the project's website --> <url>http://www.upms.com</url> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <maven.compiler.source>1.7</maven.compiler.source> <maven.compiler.target>1.7</maven.compiler.target> </properties> <dependencies> <!-- junit --> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.11</version> <scope>test</scope> </dependency> <!-- junit --> <!-- SpringMVC 依赖配置--> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> </dependency> <!-- SpringMVC 依赖配置--> <!-- Thymeleaf 依赖配置--> <dependency> <groupId>org.thymeleaf</groupId> <artifactId>thymeleaf-spring4</artifactId> </dependency> <!-- Thymeleaf 依赖配置--> <!--数据访问相关配置--> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> </dependency> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> </dependency> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> </dependency> <dependency> <groupId>com.github.pagehelper</groupId> <artifactId>pagehelper</artifactId> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-tx</artifactId> </dependency> <!--数据访问相关配置--> <dependency> <groupId>com.ework</groupId> <artifactId>ework-upms-entity</artifactId> </dependency> </dependencies> <build> <finalName>ework-upms-server</finalName> <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) --> <plugins> <plugin> <artifactId>maven-clean-plugin</artifactId> <version>3.1.0</version> </plugin> <!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging --> <plugin> <artifactId>maven-resources-plugin</artifactId> <version>3.0.2</version> </plugin> <plugin> <artifactId>maven-compiler-plugin</artifactId> <version>3.8.0</version> </plugin> <plugin> <artifactId>maven-surefire-plugin</artifactId> <version>2.22.1</version> </plugin> <plugin> <artifactId>maven-war-plugin</artifactId> <version>3.2.2</version> </plugin> <plugin> <artifactId>maven-install-plugin</artifactId> <version>2.5.2</version> </plugin> <plugin> <artifactId>maven-deploy-plugin</artifactId> <version>2.8.2</version> </plugin> </plugins> </pluginManagement> </build> </project>
8、mybatis.xml
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd"> <configuration> <settings> <!--<setting name="logImpl" value="SLF4J"/>--> <setting name="logImpl" value="STDOUT_LOGGING"/> </settings> <!-- 引入 pageHelper插件 --> <!--注意这里要写成PageInterceptor, 5.0之前的版本都是写PageHelper, 5.0之后要换成PageInterceptor--> <plugins> <plugin interceptor="com.github.pagehelper.PageInterceptor"> <!--reasonable：分页合理化参数，默认值为false。 当该参数设置为 true 时，pageNum<=0 时会查询第一页， pageNum>pages（超过总数时），会查询最后一页。 默认false 时，直接根据参数进行查询。--> <property name="reasonable" value="true"/> </plugin> </plugins> </configuration>
9、UpmsMenuMapper.xml
<?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.ework.upms.server.mapper.UpmsMenuMapper"> <resultMap type="UpmsMenu" id="UpmsMenuResult"> <result property="id" column="id" /> <result property="name" column="name" /> </resultMap> <sql id="selectMenuVo"> select id,name from tab_upms_menu </sql> <select id="selectMenuAll" resultMap="UpmsMenuResult"> <include refid="selectMenuVo"/> </select> </mapper>
10、UpmsMenu.java
package com.ework.upms.entity; import java.io.Serializable; /** * @Author: 颜士国 * @Date: 2019-09-01 16:06 */ public class UpmsMenu implements Serializable { private static final long serialVersionUID = 1L; /** 菜单ID */ private String id; /** 菜单名称 */ private String name; /** 请求地址 */ private String url; public String getId() { return id; } public void setId(String id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getUrl() { return url; } public void setUrl(String url) { this.url = url; } }
11、IndexController.java
package com.ework.upms.server.controller; import com.ework.upms.entity.UpmsMenu; import com.ework.upms.server.mapper.UpmsMenuMapper; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.ui.ModelMap; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import java.util.List; /** * @Author: 颜士国 * @Date: 2019-09-01 13:52 */ @Controller public class IndexController { @Autowired private UpmsMenuMapper menuMapper; @RequestMapping(value = "/index", method = RequestMethod.GET) public String index(ModelMap mmap) { List<UpmsMenu> upmsMenus = menuMapper.selectMenuAll(); mmap.put("menus", upmsMenus); return "index"; } @RequestMapping(value = "", method = RequestMethod.GET) public String defaultView(ModelMap mmap) { List<UpmsMenu> upmsMenus = menuMapper.selectMenuAll(); mmap.put("menus", upmsMenus); return "index"; } }
三、运行效果图
四、mybatis打印的Sql语句
大功告成