[Java知识库]Spring集成Mybatis(四)

1.创建数据库

create table t_user(
    user_id int primary key auto_increment,
    user_name varchar(20),
    user_age int,
    user_address varchar(30)
)

2.导入依赖文件

<!-- https://mvnrepository.com/artifact/org.springframework/spring-context -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>5.1.5.RELEASE</version>
    </dependency>
    <!-- spring-jdbc -->
    <!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>5.1.5.RELEASE</version>
    </dependency>
    <!-- spring_tx -->
    <!-- https://mvnrepository.com/artifact/org.springframework/spring-tx -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-tx</artifactId>
      <version>5.1.5.RELEASE</version>
    </dependency>
    <!-- MyBatis依赖 -->
    <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.4.6</version>
    </dependency>
    <!-- mybatis-spring 整合包 -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>1.3.1</version>
    </dependency>
    <!-- mysql数据库驱动 -->
    <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.38</version>
    </dependency>
    <!--druid 阿里的连接池-->
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>druid</artifactId>
      <version>1.1.7</version>
    </dependency>

3.通过mybatis-generator-core-1.3.6生成文件

• bean类
• 数据访问接口
• SQL映射文件，复制到项目的指定位置

4.创建数据库链接资源文件

mydata.properties
mydriver = com.mysql.jdbc.Driver
myurl = jdbc:mysql://127.0.0.1:3306/test
myusername = root
mypassword = 123456

?5.配置Spring配置文件【aplicationContext.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"
       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">
    <!--配置自动扫描包-->
    <context:component-scan base-package="com.wangxing.springmybatis"></context:component-scan>
    <!--配置加载mydata.properties-->
    <context:property-placeholder location="classpath:mydata.properties"></context:property-placeholder>
    <!--配置数据源-->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="${mydrivername}"></property>
        <property name="url" value="${myurl}"></property>
        <property name="username" value="${myusername}"></property>
        <property name="password" value="${mypassword}"></property>
    </bean>
    <!--配置SqlSessionFactoryBean-->
    <bean  class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"></property>
        <property name="mapperLocations" value="classpath:UserBeanMapper.xml"></property>
    </bean>
    <!--创建数据访问接口对象-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.wangxing.springmybatis.mapper"></property>
    </bean>
</beans>

6.Service业务处理层代码

package com.wangxing.springmybatis.service.impl;

import com.wangxing.springmybatis.bean.UserBean;
import com.wangxing.springmybatis.bean.UserBeanExample;
import com.wangxing.springmybatis.mapper.UserBeanMapper;
import com.wangxing.springmybatis.service.UserBeanService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
@Service("userService")
public class UserBeanServiceImpl implements UserBeanService {
    @Autowired
    private UserBeanMapper userBeanMapper;

    public void setUserBeanMapper(UserBeanMapper userBeanMapper) {
        this.userBeanMapper = userBeanMapper;
    }

    @Override
    public void insertUser(UserBean userBean) {
        userBeanMapper.insert(userBean);
    }

    @Override
    public void updateUser(UserBean userBean) {
        userBeanMapper.updateByPrimaryKey(userBean);
    }

    @Override
    public void deleteUser(int userid) {
        userBeanMapper.deleteByPrimaryKey(userid);
    }

    @Override
    public UserBean selectUserById(int userid) {
        return userBeanMapper.selectByPrimaryKey(userid);
    }

    @Override
    public List<UserBean> selectUser() {
        return userBeanMapper.selectByExample(null);
    }

    @Override
    public List<UserBean> selectUsernNameAge(UserBean userBean) {
        UserBeanExample userBeanExample=new UserBeanExample();
        UserBeanExample.Criteria criteria=userBeanExample.createCriteria();
        if(userBean.getUserName()!=null && userBean.getUserName().length()>0){
            criteria.andUserNameLike("%"+userBean.getUserName()+"%");
        }
        if(userBean.getUserAge()!=null){
            criteria.andUserAgeEqualTo(userBean.getUserAge());
        }
        List<UserBean> userBeanList=userBeanMapper.selectByExample(userBeanExample);
        return userBeanList;
    }
}

7.测试控制层代码

import com.wangxing.springmybatis.bean.UserBean;
import com.wangxing.springmybatis.service.UserBeanService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;

import java.util.List;

@Controller("userController")
public class UserBeanController {
    @Autowired
    private UserBeanService userBeanService;

    public boolean addUser(UserBean userBean){
            boolean flag=false;
            try{
                userBeanService.insertUser(userBean);
                flag=true;
            }catch (Exception e){
                e.printStackTrace();
            }
            return flag;
    }

    public boolean updateUser(UserBean userBean){
        boolean flag=false;
        try{
            userBeanService.updateUser(userBean);
            flag=true;
        }catch (Exception e){
            e.printStackTrace();
        }
        return flag;
    }

    public UserBean selectUserById(int userid){
        UserBean userBean=null;
        try{
            userBean=userBeanService.selectUserById(userid);
        }catch (Exception e){
            e.printStackTrace();
        }
        return userBean;
    }

    public List<UserBean> selectUser(){
        List<UserBean> userBeanList=null;
        try{
            userBeanList=userBeanService.selectUser();
        }catch (Exception e){
            e.printStackTrace();
        }
        return userBeanList;
    }

    public List<UserBean> selectUserNameAge(UserBean userBean){
        List<UserBean> userBeanList=null;
        try{
            userBeanList=userBeanService.selectUsernNameAge(userBean);
        }catch (Exception e){
            e.printStackTrace();
        }
        return userBeanList;
    }

    public boolean deleteUser(int ids[]){
        boolean  flag=false;
        try{
            for(int id:ids){
                userBeanService.deleteUser(id);
            }
            flag=true;
        }catch (Exception e){
            e.printStackTrace();
        }
        return flag;
    }

无奈源于不够强大

?