Spring和MyBatis的整合
目录
一、导入jar包
二、整体结构
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">
<!-- 自动扫描 -->
<context:component-scan base-package="com.itheima">
<context:exclude-filter type="annotation"
expression="org.springframework.stereotype.Controller" />
</context:component-scan>
<!-- 引入数据库的配置文件 -->
<context:property-placeholder location="conf/druid.properties" />
<!-- 数据库连接池配置 -->
<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事务管理 -->
<bean id="dataSourceTransactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"></property>
</bean>
<!-- 开启基于注解的事务 -->
<tx:annotation-driven transaction-manager="dataSourceTransactionManager"/>
<!--
整合mybatis
目的：1、spring管理所有组件。mapper的实现类。
service==>Dao @Autowired:自动注入mapper；
2、spring用来管理事务，spring声明式事务
-->
<!--创建出SqlSessionFactory对象 -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<!--指定数据源 -->
<property name="dataSource" ref="dataSource"></property>
<property name="typeAliasesPackage" value="com.itheima.entity"></property>
</bean>
<!--自动扫描com/itheima/dao下的所有dao接口，并实现这些接口，可直接在程序中使用dao接口，不需要在获取sqlsession -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer" >
<property name="basePackage" value="com/itheima/dao"></property>
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
</bean>
<!--配置一个可以进行批量执行的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>
<!-- 扫描所有的mapper接口的实现，让这些mapper能够自动注入；
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 configuration
PUBLIC "-//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"/>
<!--显式的指定每个我们需要更改的配置的值，即使他是默认的。防止版本更新带来的问题 -->
<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实体类
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;
@Override
public 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 mapper
PUBLIC "-//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 {
@Autowired
private EmployeeMapper employeeMapper;
public Employee getEmp(int id) {
return employeeMapper.getEmpById(id);
}
public List<Employee> getEmps(){
return employeeMapper.getEmps();
}
@Test
public 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);
}
}
}