目錄

一、導(dǎo)入jar包

二、整體結(jié)構(gòu)

三、ApplicationContext的配置

四、druid.properties的配置

五、mybatis-config.xml的配置

六、Employee實體類

七、EmployeeMapper

?八、EmployeeMapper.xml

九、EmployService

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一、導(dǎo)入jar包

二、整體結(jié)構(gòu)

三、ApplicationContext的配置

<?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:tx="http://www.springframework.org/schema/tx"xmlns:mybatis-spring="http://mybatis.org/schema/mybatis-spring"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://mybatis.org/schema/mybatis-spring http://mybatis.org/schema/mybatis-spring.xsd"><!-- 自動掃描 --><context:component-scan base-package="com.itheima"><context:exclude-filter type="annotation"expression="org.springframework.stereotype.Controller" /></context:component-scan> ?<!-- 引入數(shù)據(jù)庫的配置文件 --><context:property-placeholder location="conf/druid.properties" /><!-- 數(shù)據(jù)庫連接池配置 --><bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"><property name="driverClassName" value="${driverClassName}"></property><property name="url" value="${url}"></property><property name="username" value="${username}"></property><property name="password" value="${password}"></property></bean> ?<!-- spring事務(wù)管理 --><bean id="dataSourceTransactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"><property name="dataSource" ref="dataSource"></property></bean> ?<!-- 開啟基于注解的事務(wù) --><tx:annotation-driven transaction-manager="dataSourceTransactionManager"/> ?<!--整合mybatis目的：1、spring管理所有組件。mapper的實現(xiàn)類。service==>Dao ? @Autowired:自動注入mapper；2、spring用來管理事務(wù)，spring聲明式事務(wù)--><!--創(chuàng)建出SqlSessionFactory對象 --><bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"><!--指定數(shù)據(jù)源 --><property name="dataSource" ref="dataSource"></property><property name="typeAliasesPackage" value="com.itheima.entity"></property></bean><!--自動掃描com/itheima/dao下的所有dao接口，并實現(xiàn)這些接口，可直接在程序中使用dao接口，不需要在獲取sqlsession --><bean class="org.mybatis.spring.mapper.MapperScannerConfigurer" ><property name="basePackage" value="com/itheima/dao"></property><property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/></bean><!--配置一個可以進(jìn)行批量執(zhí)行的sqlSession --><bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate"><constructor-arg name="sqlSessionFactory" ref="sqlSessionFactory"></constructor-arg><constructor-arg name="executorType" value="BATCH"></constructor-arg></bean><!-- 掃描所有的mapper接口的實現(xiàn)，讓這些mapper能夠自動注入；base-package：指定mapper接口的包名--><mybatis-spring:scan base-package="com.itheima.dao"/> </beans>

四、druid.properties的配置

driverClassName=com.mysql.jdbc.Driver url=jdbc:mysql://127.0.0.1:3306/mybatis username=root password=root initialSize=5 maxActive=10 maxWait=3000 minIdle=3

五、mybatis-config.xml的配置

<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE configurationPUBLIC "-//mybatis.org//DTD Config 3.0//EN""http://mybatis.org/dtd/mybatis-3-config.dtd"> <configuration><settings><setting name="mapUnderscoreToCamelCase" value="true"/><setting name="jdbcTypeForNull" value="NULL"/><!--顯式的指定每個我們需要更改的配置的值，即使他是默認(rèn)的。防止版本更新帶來的問題 --><setting name="cacheEnabled" value="true"/><setting name="lazyLoadingEnabled" value="true"/><setting name="aggressiveLazyLoading" value="false"/></settings><databaseIdProvider type="DB_VENDOR"><property name="MySQL" value="mysql"/><property name="Oracle" value="oracle"/><property name="SQL Server" value="sqlserver"/></databaseIdProvider></configuration>

六、Employee實體類

package com.itheima.entity; ? import java.io.Serializable; ? public class Employee implements Serializable { ?private static final long serialVersionUID = 1L;private Integer id;private String name;private String gender;private String email;private String did; ?@Overridepublic String toString() {return "Employee{" +"id=" + id +", name='" + name + '\'' +", gender='" + gender + '\'' +", email='" + email + '\'' +", did='" + did + '\'' +'}';} ?public Employee() {} ?public Employee(Integer id, String name, String gender, String email, String did) {this.id = id;this.name = name;this.gender = gender;this.email = email;this.did = did;} ?public static long getSerialVersionUID() {return serialVersionUID;} ?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 String getGender() {return gender;} ?public void setGender(String gender) {this.gender = gender;} ?public String getEmail() {return email;} ?public void setEmail(String email) {this.email = email;} ?public String getDid() {return did;} ?public void setDid(String did) {this.did = did;} } ?

七、EmployeeMapper

package com.itheima.dao; ? import com.itheima.entity.Employee; import org.springframework.stereotype.Repository; ? import java.util.List; ? @Repository public interface EmployeeMapper { ?public Employee getEmpById(Integer id); ?public List<Employee> getEmps(); ? }

?八、EmployeeMapper.xml

<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE mapperPUBLIC "-//mybatis.org//DTD Mapper 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="com.itheima.dao.EmployeeMapper"> ?<resultMap id="myEmpById" type="com.itheima.entity.Employee"><id property="id" column="id"></id><result property="name" column="id"></result><result property="gender" column="gender"></result><result property="email" column="email"></result><result property="did" column="did"></result></resultMap><!-- public Employee getEmpById(Integer id); --><select id="getEmpById" resultMap="myEmpById">SELECT * FROM tb1_employee WHERE id=#{id}</select><!--public List<Employee> getEmps(); --><select id="getEmps" resultType="com.itheima.entity.Employee">SELECT * FROM tb1_employee</select> </mapper>

九、EmployService

package com.itheima.service; ? import com.itheima.dao.EmployeeMapper; import com.itheima.entity.Employee; import org.junit.Test; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import org.springframework.stereotype.Service; ? import java.util.List; ? @Service public class EmployeeService { ?@Autowiredprivate EmployeeMapper employeeMapper; ?public Employee getEmp(int id) {return employeeMapper.getEmpById(id);} ?public List<Employee> getEmps(){return employeeMapper.getEmps();} ?@Testpublic void test01(){ApplicationContext context=new ClassPathXmlApplicationContext("conf/ApplicationContext.xml");EmployeeService employeeService=(EmployeeService)context.getBean("employeeService"); ?Employee emp = employeeService.getEmp(3);System.out.println(emp);System.out.println("---------------");List<Employee> emps = employeeService.getEmps();for(Employee employee:emps){System.out.println(employee);}} }

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