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  • Mybatis笔记(二)

    MyBatis

    逆向工程

    MyBatis Generator

    • 代码生成器
    • 可以根据指定的表快速生成对应的映射文件,接口,以及Bean类
    • 支持基本的增删改查,以及QBC风格的条件查询
    • 但是一些复杂的表连接还是需要我们自己来去编写

    使用

    1.下载

    https://github.com/mybatis/generator/releases

    2.把相关jar导入到工程当中

    3.创建generatorConfig.xml

    <?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE generatorConfiguration
    	PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
    	"http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
    
    <generatorConfiguration>
    	<!--
    		targetRuntime:设置自动生成的版本
    		MyBatis3:
    		MyBatis3Simple:简单增删改查
    	-->
    	<context id="DB2Tables" targetRuntime="MyBatis3">
    		<!--
    		   不要生成日期和备注
    		-->
    		<commentGenerator>
    			<property name="suppressDate" value="true"/>
    			<property name="suppressAllComments" value="true" />
    		</commentGenerator>
    
    		<jdbcConnection driverClass="com.mysql.jdbc.Driver"
    						connectionURL="jdbc:mysql://localhost:3306/mybatis?characterEncoding=utf-8"
    						userId="root"
    						password="1234">
    		</jdbcConnection>
    
    		<!--
    		配置domain生成策略
    		targetProject:把自动生成的domian放在哪个工程里面
    		targetPackage:哪个包下
    
    		-->
    		<javaModelGenerator targetPackage="com.le.domain" targetProject=".src">
    			<property name="enableSubPackages" value="true" />
    			<property name="trimStrings" value="true" />
    		</javaModelGenerator>
    
    		<!--
    			配置mapper的生成策略
    			targetPackage:把自动生成的mapper放在哪个工程里面
    			targetProject:哪个包下
    		-->
    		<sqlMapGenerator targetPackage="com.le.mapper"  targetProject=".src">
    			<property name="enableSubPackages" value="true" />
    		</sqlMapGenerator>
    		<!--
    			mapper接口生成策略
    		-->
    		<javaClientGenerator type="XMLMAPPER" targetPackage="com.le.mapper"  targetProject=".src">
    			<property name="enableSubPackages" value="true" />
    		</javaClientGenerator>
    
    		<table tableName="customer" domainObjectName="Customer" ></table>
    		<table tableName="teacher" domainObjectName="Teacher" ></table>
    		<table tableName="student" domainObjectName="Student" ></table>
    
    	</context>
    </generatorConfiguration>
    

    4.编写生成代码

    List<String> warnings = new ArrayList<String>();
    boolean overwrite = true;
    File configFile = new File("./src/generatorConfig.xml");
    ConfigurationParser cp = new ConfigurationParser(warnings);
    Configuration config = cp.parseConfiguration(configFile);
    DefaultShellCallback callback = new DefaultShellCallback(overwrite);
    MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config, callback, warnings);
    myBatisGenerator.generate(null);
    

    分页插件

    1.下载分页插件

    https://github.com/pagehelper/Mybatis-PageHelper/blob/master/README_zh.md

    2.配置分页插件

    <plugins>
    	<plugin interceptor="com.github.pagehelper.PageInterceptor"></plugin>
    </plugins>
    

    3.使用分页插件

    在查询之前设置分页
    	 Page<Object> page = PageHelper.startPage(1, 5);
    查询数据之后添加
    	PageInfo<Customer> pageInfo = new PageInfo<>(customers, 5);
    属性介绍
    	System.out.println("当前页:"+pageInfo.getPageNum());
    	System.out.println("每页显示记录数:"+pageInfo.getPageSize());
    	System.out.println("总页数:"+pageInfo.getPages());
    	System.out.println("总记录数:"+pageInfo.getTotal());
    	System.out.println("是否有上一页:"+pageInfo.isHasPreviousPage());
    	System.out.println("是否有下一页:"+pageInfo.isHasNextPage());
    	System.out.println("导航页面:"+ Arrays.toString(pageInfo.getNavigatepageNums()));
    

    SSM整合(spring与springMVC)

    1.创建web动态工程

    2.导入spring包与配置文件

    相关jar包

    ant-1.9.6.jar
    ant-launcher-1.9.6.jar
    asm-5.2.jar
    cglib-3.2.5.jar
    com.springsource.org.aopalliance-1.0.0.jar
    com.springsource.org.apache.commons.logging-1.1.1.jar
    com.springsource.org.apache.log4j-1.2.15.jar
    com.springsource.org.aspectj.weaver-1.6.8.RELEASE.jar
    commons-logging-1.2.jar
    druid-1.0.15.jar
    javassist-3.22.0-GA.jar
    lombok.jar
    mybatis-3.4.6.jar
    mybatis-spring-1.3.2.jar
    mysql-connector-java-5.1.7-bin.jar
    ognl-3.1.16.jar
    slf4j-api-1.7.25.jar
    slf4j-log4j12-1.7.25.jar
    spring-aop-5.0.7.RELEASE.jar
    spring-aspects-5.0.7.RELEASE.jar
    spring-beans-5.0.7.RELEASE.jar
    spring-context-5.0.7.RELEASE.jar
    spring-core-5.0.7.RELEASE.jar
    spring-expression-5.0.7.RELEASE.jar
    spring-jdbc-5.0.7.RELEASE.jar
    spring-orm-5.0.7.RELEASE.jar
    spring-test-5.0.7.RELEASE.jar
    spring-tx-5.0.7.RELEASE.jar
    spring-web-5.0.7.RELEASE.jar
    

    applicationContext.xml

    <?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
    	   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    	   xmlns:context="http://www.springframework.org/schema/context"
    	   xmlns:aop="http://www.springframework.org/schema/aop"
    	   xmlns:tx="http://www.springframework.org/schema/tx"
    	   xsi:schemaLocation="http://www.springframework.org/schema/beans
    		http://www.springframework.org/schema/beans/spring-beans.xsd
    		http://www.springframework.org/schema/context
    		http://www.springframework.org/schema/context/spring-context.xsd
    	http://www.springframework.org/schema/aop
    	http://www.springframework.org/schema/aop/spring-aop.xsd
    	 http://www.springframework.org/schema/tx
    		http://www.springframework.org/schema/tx/spring-tx.xsd
    ">
    	<!--注解扫描-->
    	<context:component-scan base-package="com.le"/>
    </beans>
    

    3.在web.xml当中配置spring监听器

    <!--Spring的核心监听器-->
    <listener>
    	<listener-class>
    		org.springframework.web.context.ContextLoaderListener
    	</listener-class>
    </listener>
    <!--
    	加载Spring的配置文件的路径的
    	默认加载的/WEB-INF/applicationContext.xml
     -->
    <context-param>
    	<param-name> contextConfigLocation</param-name>
    	<param-value>classpath:applicationContext.xml</param-value>
    </context-param>
    

    4.添加springMVC相关jar包

    spring-webmvc-5.0.7.RELEASE.jar
    

    5.添加springMVC配置文件

    <?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
    	   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    	   xmlns:context="http://www.springframework.org/schema/context"
    	   xmlns:mvc="http://www.springframework.org/schema/mvc"
    	   xsi:schemaLocation="http://www.springframework.org/schema/beans
    	http://www.springframework.org/schema/beans/spring-beans.xsd
    	http://www.springframework.org/schema/context
    	http://www.springframework.org/schema/context/spring-context.xsd
    	http://www.springframework.org/schema/mvc
    	http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
    	">
    	<!--注解扫描-->
    	<context:component-scan base-package="com.le">
    		<!--只扫描控制器-->
    		<context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    	</context:component-scan>
    	<!--静态资源访问-->
    	<mvc:default-servlet-handler/>
    	<mvc:annotation-driven />
    	<!--配置视图解析器-->
    	<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    		<property name="prefix" value="/WEB-INF/view/"/>
    		<property name="suffix" value=".jsp"/>
    	</bean>
    </beans>
    

    6.在web.xml当中配置springMVC前端控制器和编码

    <!-- 解决post乱码问题 -->
    <filter>
    	<filter-name>encoding</filter-name>
    	<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    	<!-- 设置编码参是UTF8 -->
    	<init-param>
    		<param-name>encoding</param-name>
    		<param-value>UTF-8</param-value>
    	</init-param>
    </filter>
    <filter-mapping>
    	<filter-name>encoding</filter-name>
    	<url-pattern>/*</url-pattern>
    </filter-mapping>
    
    
    <!-- 配置SpringMVC前端控制器 -->
    <servlet>
    <servlet-name>mySpringMVC</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <!-- 指定SpringMVC配置文件 -->
    <!-- SpringMVC的配置文件的默认路径是/WEB-INF/${servlet-name}-servlet.xml -->
    <init-param>
    	<param-name>contextConfigLocation</param-name>
    	<param-value>classpath:springmvc.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
    <servlet-name>mySpringMVC</servlet-name>
    <!-- 拦截所有,不包括jsp,包含.js .png.css     建议使用  -->
    <url-pattern>/</url-pattern>
    </servlet-mapping>
    

    7.测试springMVC

    创建form表单

    <form action="${pageContext.request.contextPath}/addcustomer">
    	客户名称:<input type="text"> <br>
    	客户职业:<input type="text"/> <br>
    	客户电话: <input type="text"/> <br>
    	客户邮件: <input type="text"/> <br>
    	<input type="submit" value="添加">
    </form>
    

    创建CustomterController处理业务

    package com.le.web;
    
    import com.le.domain.Customer;
    import com.le.service.CustomerService;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.RequestMapping;
    
    @Controller
    public class CustomerController {
        /*注入业务层*/
        @Autowired
        private CustomerService customerService;
    
        @RequestMapping("addCustomer")
        public String addCustomer(Customer customer){
            /*接收参数*/
            System.out.println("来到了web层"+customer);
            /*把数据保存到数据库当中*/
            /*调用业务层 保存到数据库当中*/
            customerService.saveCustomer(customer);
            return "result";
        }
    }			
    
    package com.le.service;
    
    import com.le.domain.Customer;
    import com.le.mapper.CustomerMapper;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Service;
    import org.springframework.transaction.annotation.Transactional;
    
    @Service("CustomerService")
    @Transactional
    public class CustomerServiceImpl implements CustomerService {
        @Autowired
        private CustomerMapper customerMapper;
    
        @Override
        public void saveCustomer(Customer customer) {
            System.out.println("来到了业务层 保存 customer"+customer);
            /*调用dao层*/
            customerMapper.insertCustomer(customer);
        }
    }
    
    package com.le.mapper;
    
    import com.le.domain.Customer;
    
    public interface CustomerMapper {
        public void insertCustomer(Customer customer);
    }
    
    <?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.le.mapper.CustomerMapper">
        <insert id="insertCustomer">
            insert into `customer`(cust_name,cust_profession,cust_phone,email)
            values (#{cust_name},#{cust_profession},#{cust_phone},#{email})
        </insert>
    </mapper>
    

    8.添加Mybatis相关jar包

    ant-1.9.6.jar
    ant-launcher-1.9.6.jar
    asm-5.2.jar
    cglib-3.2.5.jar
    commons-logging-1.2.jar
    javassist-3.22.0-GA.jar
    junit-4.9.jar
    log4j-1.2.17.jar
    log4j-api-2.3.jar
    log4j-core-2.3.jar
    lombok.jar
    mybatis-3.4.6.jar
    mysql-connector-java-5.1.7-bin.jar
    ognl-3.1.16.jar
    slf4j-api-1.7.25.jar
    slf4j-log4j12-1.7.25.jar
    

    9.添加Mybatis配置文件和数据库属性文件

    sqlMapConfig.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="STDOUT_LOGGING"/>
    	</settings>
    	<typeAliases>
    		<!-- 批量别名定义,扫描整个包下的类,别名为类名(大小写不敏感) -->
    		<package name="com.le.domain" />
    	</typeAliases>
    </configuration>
    

    db.properties

    jdbc.driver=com.mysql.jdbc.Driver
    jdbc.url=jdbc:mysql://localhost:3306/mybatis?characterEncoding=utf-8
    jdbc.username=root
    jdbc.password=1234
    

    9.创建CustomerMapper

    <?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.le.mapper">
    </mapper>
    

    10.在applicationContext.xml配置文件中添加Mybatis数据库相关配置信息

    <!--加载数据库属性文件-->
    <context:property-placeholder location="classpath:db.properties"/>
    <!--连接池-->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
    	<property name="driverClassName" value="${jdbc.driver}" />
    	<!--属性文件当中的名称不能和name名称一样-->
    	<property name="url" value="${jdbc.url}" />
    	<property name="username" value="${jdbc.username}" />
    	<property name="password" value="${jdbc.password}" />
    </bean>
    <!-- 配置事务管理器 -->
    <bean id="transactionManager"
    	  class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
    	<!-- 数据源 -->
    	<property name="dataSource" ref="dataSource" />
    </bean>
    
    <!-- 开启注解事务 -->
    <tx:annotation-driven transaction-manager="transactionManager"/>
    <!-- Mybatis的工厂 -->
    <bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
    <property name="dataSource" ref="dataSource"/>
    <!-- 核心配置文件的位置 -->
    <property name="configLocation" value="classpath:sqlMapConfig.xml"/>
    <!--配置mapper映射文件的路径-->
    <property name="mapperLocations" value="classpath:com/le/mapper/*.xml"/>
    </bean>
    
    <!-- 配置Mapper扫描 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
    <!-- 配置Mapper扫描包 -->
    <property name="basePackage" value="com.le.mapper" />
    </bean>
    
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  • 原文地址:https://www.cnblogs.com/mumuyinxin/p/10967843.html
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