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

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>