spring+mybatis

闲话少叙，自由自在

项目简单说明：为了学习springboot特性，特意搭建spring用户改造springboot，项目采用简单的mybatis模式+配置文件方式。

项目目录结构：

 代码详细介绍：

spring 配置文件：applicationContext.xml

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

    <!-- 配置组件包扫描的位置 -->
    <context:component-scan base-package="com.adao" />
    
    <!-- 读取db.properties配置文件到Spring容器中 -->
    <context:property-placeholder location="classpath:db.properties" />
    
    <!-- 配置service的实现类 -->
    <bean name="teaminalService" class="com.adao.service.impl.TeaminalServiceImpl"></bean>
    
    <!-- 配置 阿里巴巴的 druid 数据源（连接池） -->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init"
        destroy-method="close">
        <!-- 基本属性 url、user、password -->
<!--     <property name="driverClassName" value="oracle.jdbc.driver.OracleDriver" />
        <property name="url" value="jdbc:oracle:thin:@192.168.128.59:1521:ORCL" />
        <property name="username" value="coll_platform" />
        <property name="password" value="coll_platform" /> -->
        <!-- 基本属性 url、user、password -->
        <property name="driverClassName" value="${db.driverClassName}" />
        <property name="url" value="${db.url}" />
        <property name="username" value="${db.username}" />
        <property name="password" value="${db.password}" />
        
        <property name="initialSize" value="5" />
        <property name="minIdle" value="1" />
        <property name="maxActive" value="50" />
        <!-- 配置获取连接等待超时的时间 -->
        <property name="maxWait" value="60000" />
        <!-- 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒 -->
        <property name="timeBetweenEvictionRunsMillis" value="60000" />
        <!-- 配置一个连接在池中最小生存的时间，单位是毫秒 -->
        <property name="minEvictableIdleTimeMillis" value="300000" />
        <property name="validationQuery" value="SELECT 1 FROM DUAL" />
        <property name="testWhileIdle" value="true" />
        <property name="testOnBorrow" value="false" />
        <property name="testOnReturn" value="false" />
        <!-- 打开removeAbandoned功能 -->
        <property name="removeAbandoned" value="true" />
        <property name="removeAbandonedTimeout" value="1800" /> <!-- 1800秒，也就是30分钟 -->
        <property name="logAbandoned" value="true" /> <!-- 关闭abanded连接时输出错误日志 -->
        <!-- 打开PSCache，并且指定每个连接上PSCache的大小,mysql 不使用 -->
        <property name="poolPreparedStatements" value="true" />
        <!-- 配置监控统计拦截的filters -->
        <property name="filters" value="stat" />
        <!-- 慢查询sql打印 -->
        <property name="connectionProperties" value="druid.stat.slowSqlMillis=100" />

    </bean>
    
        <!-- sqlSessionFactory给spring托管 -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 数据源 -->
        <property name="dataSource" ref="dataSource"></property>
        <!-- 别名,类名开头变小写 -->
        <property name="typeAliasesPackage"  value="com.adao.pojo"></property>
        <!-- sql映射文件路径 -->
        <!-- classpath *和不加*的区别 -->
        <property name="mapperLocations" value="classpath*:com/adao/mapper/*Mapper.xml"></property>
        <property name="configLocation" value="classpath:mybatis-config.xml"></property>
    </bean>

    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!-- 配置SqlSessionFactoryBean的名称 -->
        <property name="basePackage" value="com.adao.mapper" />
        <!-- 可选，如果不写，Spring启动时候。容器中。自动会按照类型去把SqlSessionFactory对象注入进来 -->
        <!-- <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/> -->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" />
    </bean>

</beans>

数据库配置文件：db.properties

#db config
db.driverClassName=oracle.jdbc.driver.OracleDriver
db.url=jdbc:oracle:thin:@192.168.128.59:1521:ORCL
db.username=coll_platform
db.password=coll_platform

实体类： pojo.Teaminal

package com.adao.pojo;

/**
 * 终端档案
 * 
 */
public class Teaminal {

    private long rtuId; // 终端ID

    private long rtuAddress;// 终端地址

    public long getRtuId() {
        return rtuId;
    }

    public void setRtuId(long rtuId) {
        this.rtuId = rtuId;
    }

    public long getRtuAddress() {
        return rtuAddress;
    }

    public void setRtuAddress(long rtuAddress) {
        this.rtuAddress = rtuAddress;
    }

}

mapper.TeaminalMapper

package com.adao.mapper;

import java.util.List;

import com.adao.pojo.Teaminal;

/**
 * 终端mapper
 * 
 */

public interface TeaminalMapper {
    
    /**
     * 根据ID取终端名称
     * 
     * @param terId
     * @return
     */
    public String getTerNameById(long terId);
    
    public List<Teaminal> list();

    
}

mapper.TeaminalMapper.xml

<?xml version="1.0" encoding="UTF-8" ?> 
<!DOCTYPE mapper PUBLIC "-//ibatis.apache.org//DTD Mapper 3.0//EN" "http://ibatis.apache.org/dtd/ibatis-3-mapper.dtd">

<mapper namespace="com.adao.mapper.TeaminalMapper">
    <!-- 根据ID取终端名称 -->
    <select id="getTerNameById" resultType="String">
        select TERMINAL_NAME
        from T_TERMINAL  where TERMINAL_ID=#{terId}
    </select>

    <select id="list" resultType="Teaminal">
        select * from T_TERMINAL
    </select>    
    
</mapper>

service:TeaminalService

package com.adao.service;

import java.util.List;

import com.adao.pojo.Teaminal;

public interface TeaminalService {

    public List<Teaminal> list();
    
    public String getTerNameById();

}

service:TeaminalServiceImpl

package com.adao.service.impl;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;

import com.adao.mapper.TeaminalMapper;
import com.adao.pojo.Teaminal;
import com.adao.service.TeaminalService;


//@Service
public class TeaminalServiceImpl implements TeaminalService {
 
    /*
     *     问题1 ： UserMapper是接口，如何创建对象？
     *     答： 使用MyBatis的SqlSession 会话对象。
     * 
     *    问题2：SqlSession如何创建？
     *    答： 使用MyBatis的SqlSessionFactory 工厂对象创建
     *
     *    问题3:SqlSessionFactory工厂对象如何创建？
     *
     *    答：在使用Spring之前
     *    开发者自己写代码读取MyBatis配置文件，创建SqlSessionFactory
     *    使用Spring之后，让Spring框架帮我们创建
     *
     *    问题4：SqlSessionFactory 工厂对象Spring框架如何创建出来？
     *
     *    答：MyBatis工厂对象创建的类在 MyBatis框架和Spring集成的桥梁包mybatis-spring-1.3.1.jar
     *      的org.mybatis.spring.SqlSessionFactoryBean 负责创建工厂对象
     *        开发者只需要在Spring配置配置此类就可以创建出来SqlSessionFactory对象 
     * 
     */
     @Autowired
        private TeaminalMapper teaminalMapper;

        @Override
        public List<Teaminal> list(){
             System.out.println("teaminalMapper : " + teaminalMapper);
            return teaminalMapper.list();
        }
        
        @Override
        public String getTerNameById(){

            long terId= Long.parseLong("1437640452317");
            String teaminalName =teaminalMapper.getTerNameById(terId);
            System.out.println(teaminalName);
            return teaminalName;
        }

}

main  测试类

package com.adao;

import java.util.List;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.adao.pojo.Teaminal;
import com.adao.service.TeaminalService;

/**
 * 
 * 
 * @author adao 2020-06-20
 */
public class test01 {
    public static void main(String[] args) {
        ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");
        TeaminalService teaminalService = ac.getBean(TeaminalService.class);// 单例才能这样传类类型
        System.out.println("teaminalService : " + teaminalService);
        List<Teaminal> list = teaminalService.list();
        System.out.println(list.size());

        String teaminalName = teaminalService.getTerNameById();
        System.out.println(teaminalName);
    }
}

数据库数据：

CREATE TABLE "COLL_PLATFORM"."T_TERMINAL"
( "TERMINAL_ID" NUMBER(14,0) NOT NULL ENABLE,
"TERMINAL_ADDRESS" NUMBER(16,0) NOT NULL ENABLE,
"TERMINAL_NAME" VARCHAR2(60) NOT NULL ENABLE,
) SEGMENT CREATION IMMEDIATE
PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 NOCOMPRESS LOGGING
STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)
TABLESPACE "USERS"

 

执行结果：

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原文地址：https://www.cnblogs.com/adao21/p/13167864.html