Unit08： Spring集成mybatis

Posted 2020-09-03 唐胜伟

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　　　　Unit08： Spring集成mybatis　　　　

1. Spring集成mybatis

(1)方式一

step1. 导包。
spring-webmvc,mybatis,mybatis-spring, ojdbc,dbcp,spring-jdbc,junit。

step2. 添加spring的配置文件。
注：集成之后，不再需要mybatis的配置文件了，之前的配置信息用一个bean(SqlSessionFactoryBean)来代替。

step3.实体类。
step4.映射文件。
step5.Mapper映射器。
step6.配置MapperScannerConfigurer。

注：该bean负责调用SqlSession的getMapper方法，获得符合Mapper映射器要求的对象。并且会将这些对象放到spring 容器里面（默认的id是首字母小写之后的接口名，比如Mapper 映射器名为EmpDAO,则默认的id是empDAO,也可以使用@Repository 来修改默认的id）。
注：如果只扫描特定的映射器，可以做如下两步。
step1.开发一个注解，比如@MyBatisRepository,并且，将该注解添加到需要扫描的映射器上面。

注入annotationClass属性值。

代码：

src/main/java

annotations

package annotations;

public @interface MyBatisRepository {

}

MyBatisRepository.java

dao

package dao;

import java.util.List;
import java.util.Map;

import org.springframework.stereotype.Repository;

import annotations.MyBatisRepository;
import entity.Employee;
import entity.Employee2;

/**
 * Mapper映射器
 *
 */
@Repository("empDAO")
@MyBatisRepository
public interface EmployeeDAO {
    public void save(Employee e);
    public List<Employee> findAll();
    public Employee findById(int id);
    public void modify(Employee e);
    public void delete(int id);
    public Map findById2(int id);
    public Employee2 findById3(int id);
}

EmployeeDAO.java

entity

package entity;

public class Employee {
    private Integer id;
    private String name;
    private Integer age;
    
    @Override
    public String toString() {
        return "Employee [id=" + id + ", name=" + name + ", age=" + age + "]";
    }
    public Integer getId() {
        return id;
    }
    public void setId(Integer id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public Integer getAge() {
        return age;
    }
    public void setAge(Integer age) {
        this.age = age;
    }
    
}

Employee.java

package entity;

public class Employee2 {
    private Integer empNo;
    private String ename;
    private Integer age;
    
    @Override
    public String toString() {
        return "Employee2 [empNo=" + empNo + ", ename=" + ename + ", age=" + age + "]";
    }
    
    public void setEmpNo(Integer empNo) {
        this.empNo = empNo;
    }
    public void setEname(String ename) {
        this.ename = ename;
    }
    public void setAge(Integer age) {
        this.age = age;
    }
    
}

Employee2.java

<?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="dao.EmployeeDAO">
    <!-- 
        id:要求唯一
        parameterType:参数类型，要写类的完整的名称。
     -->
    <insert id="save" 
        parameterType="entity.Employee">
        INSERT INTO emp_czh 
        VALUES(emp_czh_seq.nextval,#{name},#{age})
    </insert>
    
    <!-- 
        resultType:返回类型，要写类的完整的名称。
     -->
    <select id="findAll" 
        resultType="entity.Employee">
        SELECT * FROM emp_czh
    </select>
    
    <select id="findById" 
        parameterType="int" 
        resultType="entity.Employee">
        SELECT * FROM emp_czh
        WHERE id = #{id1}
    </select>
    
    <update id="modify" 
        parameterType="entity.Employee">
        UPDATE emp_czh SET name = #{name},
        age = #{age} WHERE id = #{id}
    </update>
    
    <delete id="delete" parameterType="int">
        DELETE FROM emp_czh WHERE id = #{id1}
    </delete>
    
    <!-- 返回Map类型的结果 -->
    <!-- 
        map是java.util.Map的简写形式
     -->
    <select id="findById2" parameterType="int"
        resultType="map">
        SELECT * FROM emp_czh WHERE id = #{id1}
    </select>
    
    <!-- 
        resultMap告诉mybatis表的字段名
        与实体类的属性名的对应关系。
        （如果表的字段名与属性名相同，则不用写了）
     -->
    <resultMap type="entity.Employee2" 
        id="empResultMap">
        <result property="empNo" column="id"/>
        <result property="ename" column="name"/>
    </resultMap>
    
    <select id="findById3" parameterType="int"
        resultMap="empResultMap">
        SELECT * FROM emp_czh WHERE id = #{id1}
    </select>
</mapper>

EmpMapper.xml

src/mian/resources

# db connection parameters
# key=value
driver=oracle.jdbc.driver.OracleDriver
url=jdbc:oracle:thin:@192.168.201.227:1521:orcl
user=openlab
pwd=open123
# datasource parameters
initSize=1
maxSize=1

db.properties

<?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:jdbc="http://www.springframework.org/schema/jdbc"  
    xmlns:jee="http://www.springframework.org/schema/jee" 
    xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:aop="http://www.springframework.org/schema/aop" 
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:util="http://www.springframework.org/schema/util"
    xmlns:jpa="http://www.springframework.org/schema/data/jpa"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd
        http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.2.xsd
        http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.2.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
        http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
        http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.2.xsd">
    <!-- 读取db.properties文件 -->
    <util:properties id="db" 
    location="classpath:db.properties"/>
    <!-- 配置连接池 -->
    <bean id="ds" 
    class="org.apache.commons.dbcp.BasicDataSource"       
       destroy-method="close">       
      <property name="driverClassName" 
          value="#{db.driver}" />      
      <property name="url" 
          value="#{db.url}" />      
      <property name="username" 
          value="#{db.user}" />      
      <property name="password" 
          value="#{db.pwd}" />      
    </bean> 
    <!-- 配置SqlSessionFactoryBean -->
    <bean id="ssfb" 
        class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 注入连接池 -->
        <property name="dataSource" ref="ds"/>
        <!-- 注入映射文件的位置信息 -->
        <property name="mapperLocations"
        value="classpath:entity/*.xml"/>
    </bean>
    <!-- 配置MapperScannerConfigurer -->
    <bean 
    class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!-- 注入要扫描的包名 -->
        <property name="basePackage"
        value="dao"/>
        <!-- 只扫描带有该注解的映射器 -->
        <property name="annotationClass"
        value="annotations.MyBatisRepository"/>
    </bean>
</beans>

spring-mybatis.xml

src/test/java

test

package test;

import java.util.List;

import org.junit.Before;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import dao.EmployeeDAO;
import entity.Employee;

public class TestCase {
    private EmployeeDAO dao;
    @Before
    public void init(){
        ApplicationContext ac = 
            new ClassPathXmlApplicationContext(
                "spring-mybatis.xml");
        dao = ac.getBean("empDAO",
                EmployeeDAO.class);
    }
    @Test
    public void test1(){
        List<Employee> emps = 
                dao.findAll();
        System.out.println(emps);
    }
    @Test
    public void test2(){
        Employee e = new Employee();
        e.setName("Rod Johnson");
        e.setAge(40);
        dao.save(e);
    }
}

TestCase.java

  <dependencies>
      <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-webmvc</artifactId>
          <version>3.2.8.RELEASE</version>
      </dependency>
      <dependency>
          <groupId>org.mybatis</groupId>
          <artifactId>mybatis</artifactId>
          <version>3.2.8</version>
      </dependency>
      <dependency>
          <groupId>org.mybatis</groupId>
          <artifactId>mybatis-spring</artifactId>
          <version>1.2.2</version>
      </dependency>
      <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-jdbc</artifactId>
          <version>3.2.8.RELEASE</version>
      </dependency>
      <dependency>
          <groupId>com.oracle</groupId>
          <artifactId>ojdbc14</artifactId>
          <version>10.2.0.4.0</version>
      </dependency>
      <dependency>
          <groupId>commons-dbcp</groupId>
          <artifactId>commons-dbcp</artifactId>
          <version>1.4</version>
      </dependency>
      <dependency>
          <groupId>junit</groupId>
          <artifactId>junit</artifactId>
          <version>4.12</version>
      </dependency>
  </dependencies>

pom.xml

(2)方式二