结构:
Paste_Image.pngjar包:
Paste_Image.png配置文件:
myBatis-conf.xml
<?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>
<typeAliases>
<typeAlias type="com.xxjqr.entity.Dept" alias="Dept"/>
</typeAliases>
<mappers>
<mapper resource="com/xxjqr/entity/DeptMapper.xml"/>
</mappers>
</configuration>
applicationContext.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:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd">
<!-- 开启注解扫描 -->
<context:component-scan base-package="com.xxjqr"></context:component-scan>
<!-- 加载Proerties配置文件 -->
<context:property-placeholder location="classpath:com/xxjqr/dao/db.properties"/>
<!-- 配置数据源 -->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="driverClass" value="${driverClass}"></property>
<property name="jdbcUrl" value="${jdbcUrl}"></property>
<property name="user" value="${user}"></property>
<property name="password" value="${password}"></property>
</bean>
<!-- 配置sqlSession工厂 -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"></property>
<property name="configLocation" value="classpath:myBatis-conf.xml"></property>
</bean>
<!-- 配置sqlSessionTemplate -->
<bean id="sqlSessionTemplate" class="org.mybatis.spring.SqlSessionTemplate">
<constructor-arg name="sqlSessionFactory" ref="sqlSessionFactory"></constructor-arg>
</bean>
</beans>
DeptMapper.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.xxjqr.entity.DeptMapper"><!-- 当前包+文件名 -->
<resultMap type="Dept" id="deptResultMap">
<id column="dept_id" property="deptId"/>
<result column="dept_name" property="deptName"/>
<result column="dept_address" property="deptAddress"/>
</resultMap>
<insert id="insertDept" parameterType="Dept">
insert into dept_t(dept_name,dept_address) values(#{deptName},#{deptAddress})
</insert>
</mapper>
类:
package com.xxjqr.dao.impl;
import javax.annotation.Resource;
import org.mybatis.spring.SqlSessionTemplate;
import org.springframework.stereotype.Repository;
import com.xxjqr.dao.DeptDao;
import com.xxjqr.entity.Dept;
import lombok.Data;
@Repository("deptDao")
@Data
public class DeptDaoImpl implements DeptDao {
@Resource
private SqlSessionTemplate sqlSessionTemplate;
public int insertDept(Dept dept) {
//命名空间+sqlId
return sqlSessionTemplate.insert("com.xxjqr.entity.DeptMapper.insertDept",dept);
}
}
package com.xxjqr.service.impl;
import javax.annotation.Resource;
import org.springframework.stereotype.Service;
import com.xxjqr.dao.DeptDao;
import com.xxjqr.entity.Dept;
import com.xxjqr.service.DeptService;
import lombok.Data;
@Service("deptService")
@Data
public class DeptServiceImpl implements DeptService {
@Resource
private DeptDao deptDao;
public int insertDept(Dept dept) {
deptDao.insertDept(dept);
return 0;
}
}
package com.xxjqr.Test;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.xxjqr.entity.Dept;
import com.xxjqr.service.DeptService;
public class App {
@Test
public void testInsertDept(){
ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml",App.class);
DeptService deptService = (DeptService)ac.getBean("deptService");
Dept dept = new Dept();
dept.setDeptName("开发部");
dept.setDeptAddress("贵州");
System.out.println("受影响行数:"+deptService.insertDept(dept));
}
}
优化
1. 优化别名
myBatis-conf.xml中修改
2. 优化sql映射文件的加载
myBatis-conf.xml中
applicationContext.xml中修改
Paste_Image.png
3. 优化dao实现
<?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:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd">
<!-- 开启注解扫描 -->
<context:component-scan base-package="com.xxjqr"></context:component-scan>
<!-- 加载Proerties配置文件 -->
<context:property-placeholder location="classpath:db.properties"/>
<!-- 配置数据源(使用MapperScannerConfigurer后就不能使用这种方式了???) -->
<!-- <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"> -->
<!-- <property name="driverClass" value="${driverClass}"></property> -->
<!-- <property name="jdbcUrl" value="${jdbcUrl}"></property> -->
<!-- <property name="user" value="${user}"></property> -->
<!-- <property name="password" value="${password}"></property> -->
<!-- </bean> -->
<!-- 配置数据源,记得去掉myBatis-config.xml的数据源相关配置 -->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="driverClass" value="com.mysql.jdbc.Driver" />
<property name="jdbcUrl" value="jdbc:mysql://localhost:3306/mybatis01" />
<property name="user" value="root" />
<property name="password" value="221121" />
</bean>
<!-- 配置sqlSession工厂 -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"></property>
<property name="configLocation" value="classpath:myBatis-conf.xml"></property>
<!-- 配置扫描式加载SQL映射文件 -->
<property name="mapperLocations" value="classpath:com/xxjqr/entity/*.xml"/>
</bean>
<!-- 配置事务管理器 -->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"></property>
</bean>
<!-- 转换器 (可以省略dao的实现类) -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="sqlSessionFactory" ref="sqlSessionFactory"/>
<property name="basePackage" value="com.xxjqr.dao"/>
</bean>
<!-- 使用该配置可以生成
basepack包下的所有Mapper.xml中命名空间 对应 dao接口的代理对象;并注入到spring容器中
sql的id就应该是dao接口中定义的方法名 -->
</beans>
<?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.xxjqr.entity.DeptMapper"> -->
<!-- mapper的namespace应该对应的是dao接口 -->
<mapper namespace="com.xxjqr.dao.DeptDao">
<resultMap type="Dept" id="deptResultMap">
<id column="dept_id" property="deptId"/>
<result column="dept_name" property="deptName"/>
<result column="dept_address" property="deptAddress"/>
</resultMap>
<!-- id对应的是dao接口定义的方法 -->
<insert id="insertDept" parameterType="Dept">
insert into dept_t(dept_name,dept_address) values(#{deptName},#{deptAddress})
</insert>
</mapper>
使用该配置后,就无需Dao接口的实现了,因为框架会自动将dao接口的代理对象并注入到spring容器中;
DeptServiceImpl会通过@Autowired将代理对象注入到“dao接口”引用
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