Mybatis笔记（二）
2024-08-26 14:02:13
目录
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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