SpringMVC+Mybatis全套增删改(小白入门)

作者：刘佳乐

• 2020.6.27

先到官网了解mybatis的语法：https://mybatis.org/mybatis-3/zh/index.html

一、创建如下所示项目

二、在src下的cn.kgc.vo包下创建 Dept.java

package cn.kgc.vo;
public class Dept {

  private long deptno;
  private String dname;
  private String loc;


  public long getDeptno() {
    return deptno;
  }

  public void setDeptno(long deptno) {
    this.deptno = deptno;
  }


  public String getDname() {
    return dname;
  }

  public void setDname(String dname) {
    this.dname = dname;
  }


  public String getLoc() {
    return loc;
  }

  public void setLoc(String loc) {
    this.loc = loc;
  }

}

三、在src下的cn.kgc.mapper包下创建 DeptMapper.java

package cn.kgc.mapper;

import cn.kgc.vo.Dept;
import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;

import java.util.List;

public interface DeptMapper {
    @Select("select * from dept")
    List<Dept> selectDept();

    @Insert("insert into dept(dname) values (#{dname})")
    int insertDept(Dept dept);

    @Update("update dept set dname=#{dname} values deptno=#{deptno}")
    int updateDept(Dept dept);

    @Delete("delete  from dept where deptno=#{deptno}")
    int deleteDept(Integer deptno);
}

四、在src下的cn.kgc.service包下创建 DeptService.java

package cn.kgc.service;

import cn.kgc.vo.Dept;

import java.util.List;

public interface DeptService {
    List<Dept> showDept();

    int add(Dept dept);

    int edit(Dept dept);

    int del(Integer deptno);
}

五、在src下的cn.kgc.service包下创建 DeptServiceImpl.java

package cn.kgc.service;

import cn.kgc.mapper.DeptMapper;
import cn.kgc.vo.Dept;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

@Service
@Transactional
public class DeptServiceImpl implements DeptService {

    @Autowired
    private DeptMapper deptMapper;

    @Override
    public List<Dept> showDept() {
        return deptMapper.selectDept();
    }
    @Override
    public int add(Dept dept) {
        return deptMapper.insertDept(dept);
    }
    @Override
    public int edit(Dept dept) {
        return deptMapper.updateDept(dept);
    }
    @Override
    public int del(Integer deptno) {
        return deptMapper.deleteDept(deptno);
    }
}

六、在src下的cn.kgc.controller包下创建 CenterController.java

package cn.kgc.controller;

import cn.kgc.mapper.DeptMapper;
import cn.kgc.vo.Dept;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@RestController
public class CenterController  {

    @Autowired
    private DeptMapper deptMapper;

    @GetMapping("/data.do")
    public List<Dept> showDept() {
        return deptMapper.selectDept();
    }
    
    @PostMapping("/add.do")
    public int add(Dept dept) {
        return deptMapper.insertDept(dept);
    }
    
    @PostMapping("/edit.do")
    public int edit(Dept dept) {
        return deptMapper.updateDept(dept);
    }

    @GetMapping("/del.do")
    public int del(Integer deptno) {
        return deptMapper.deleteDept(deptno);
    }
}

七、在Webapp下的WEB-INF下创建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>
  <filter>
    <filter-name>character</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <init-param>
      <param-name>encoding</param-name>
      <param-value>UTF-8</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>character</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
  
  <servlet>
    <servlet-name>springMVC</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    
  </servlet>
  <servlet-mapping>
    <servlet-name>springMVC</servlet-name>
    <url-pattern>*.do</url-pattern>
  </servlet-mapping>
  
  
</web-app>

八、在Webapp下的WEB-INF下创建springMVC-servlet.xml.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:contex="http://www.springframework.org/schema/context"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx"
       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.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
        http://www.springframework.org/schema/mvc
       http://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <!--1、全局扫描包-->
    <contex:component-scan base-package="cn.kgc"/>
    <!--2、mvc注解驱动-->
    <mvc:annotation-driven/>
    <!--3、驱动管理数据源-->
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://localhost:3306/kh85"/>
        <property name="username" value="root"/>
        <property name="password" value="root"/>
    </bean>
    <!--4、sqlsessionfactybean-->
    <bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
    </bean>
    <!--5、数据源事务管理-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"/>
    </bean>
    <!--6、事务注解驱动-->
    <tx:annotation-driven/>
    <!--7、映射扫描参数-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="cn.kgc.mapper"/>
    </bean>
</beans>

九、运行如下(没有写页面)