Previous articles, we describe a web decoupling layer and the service layer, the focus of our attention only in two layers, but in a real project which will certainly require database access. Therefore, this article describes how the data query logic is added in front of the foundation.
1, environmental constraints
- win10 64 operating system
- idea2018.1.5
- maven-3.0.5
- jdk-8u162-windows-x64
2, software download
Baidu network disk:
Link: https://pan.baidu.com/s/1gfnI8NqUYgYK1g0ULGIV2w
extraction code: q9pl
3, the premise of restraint
- zookeeper and dubbo has been installed and started
- This album will be "05 to create a web service layer [consumer] and start" doing complete
- mysql has been installed, and execute the following sql statement:
use test;
create table t_user(id int ,name varchar(20));
insert into t_user(id,name) values(1,'zhangsan');
insert into t_user(id,name) values(2,'lisi');
insert into t_user(id,name) values(3,'wangwu');
insert into t_user(id,name) values(4,'ali');
insert into t_user(id,name) values(5,'xiaoili');
insert into t_user(id,name) values(6,'zhangli');
4, the steps:
4.1 The first step: Make sure mybatis related jar package has joined rely [Note: the outermost pom.xml]
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>${mybatis.version}</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>${mybatis.spring.version}</version>
</dependency>
<dependency>
<groupId>com.github.miemiedev</groupId>
<artifactId>mybatis-paginator</artifactId>
<version>${mybatis.paginator.version}</version>
</dependency>
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper</artifactId>
<version>${pagehelper.version}</version>
</dependency>
<!-- MySql -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>${mysql.version}</version>
</dependency>
<!-- 连接池 -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>${druid.version}</version>
</dependency>
4.2 Step Two: Create a new fbs-dao
- The following dependencies are added in pom.xml fbs-dao module:
<dependency>
<groupId>net.wanho.fenbushi</groupId>
<artifactId>fbs-pojo</artifactId>
<version>1.0-SNAPSHOT</version>
<scope>compile</scope>
</dependency>
- Fbs-dao in the src / main / java and create a net.wanho.fenbushi.mapper package, the package added UserMapper.java category among
package net.wanho.fenbushi.mapper;
import net.wanho.fenbushi.pojo.User;
import java.util.List;
public interface UserMapper {
List<User> query();
}
- Fbs-dao added UserMapper.xml in which the packet net.wanho.fenbushi.mapper
<?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="net.wanho.fenbushi.mapper.UserMapper">
<select id="query" resultType="net.wanho.fenbushi.pojo.User">
select * from t_user
</select>
</mapper>
- Modify fbs-dao pom.xml is
added build labels:
<build>
<resources>
<resource>
<directory>src/main/java</directory>
<includes>
<include>**/*.xml</include>
</includes>
</resource>
</resources>
</build>
4.3 The third step: Modify fbs-service
- Fbs-service modify the pom.xml, dependent added dao layer
<dependency>
<groupId>net.wanho.fenbushi</groupId>
<artifactId>fbs-dao</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
- Modify fbs-service of net.wanho.fenbushi.service.impl.UserServiceImpl.java
package net.wanho.fenbushi.service.impl;
import net.wanho.fenbushi.mapper.UserMapper;
import net.wanho.fenbushi.pojo.User;
import net.wanho.fenbushi.service.UserService;
import org.springframework.stereotype.Service;
import javax.annotation.Resource;
import java.util.ArrayList;
import java.util.List;
@Service
public class UserServiceImpl implements UserService {
@Resource
private UserMapper userMapper;
@Override
public List<User> queryUsers() {
List<User> list = userMapper.query();
return list;
}
}
- Increase the database, and transaction pages in fbs-service of src / main / resources in the configuration file
applicationContext-dao.xml [Note: The database account password, please change the actual situation]
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
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">
<!--配置数据库连接池,使用的是druid,数据库的实例、账号、密码,请根据实际情况修改-->
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
<property name="url" value="jdbc:mysql://localhost:3306/test"></property>
<property name="username" value="root"></property>
<property name="password" value="zhangli"></property>
</bean>
<!--配置SqlSession的工厂-->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="configLocation" value="classpath:Mybatis-Config.xml"/>
<property name="dataSource" ref="dataSource"></property>
</bean>
<!--配置数据库操作的接口以及xml所在package-->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="net.wanho.fenbushi.mapper"></property>
</bean>
</beans>
applicationContext-trans.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: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.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">
<!--设置事务管理器,引用的是applicationContext-dao.xml中配置的datasource-->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"></property>
</bean>
<!--配置事务通知,引用上面设置的事务管理器
add开头的方法需要事务
其他方法都是只读的
-->
<tx:advice id="advice" transaction-manager="transactionManager">
<tx:attributes>
<tx:method name="add*" propagation="REQUIRED"/>
<tx:method name="update*" propagation="REQUIRED"/>
<tx:method name="delete*" propagation="REQUIRED"/>
<tx:method name="*" read-only="true"/>
</tx:attributes>
</tx:advice>
<!--定义连接点,advisor定义了通知在连接点上执行即织入-->
<aop:config>
<aop:pointcut id="pointcut" expression="execution(* net.wanho.fenbushi.service.*.*(..))"></aop:pointcut>
<aop:advisor advice-ref="advice" pointcut-ref="pointcut"></aop:advisor>
</aop:config>
</beans>
Mybatis-Config.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>
<plugins>
<plugin interceptor="com.github.pagehelper.PageInterceptor">
</plugin>
</plugins>
</configuration>
- Confirm fbs-service layer can load all of the parent container xml file
<!DOCTYPE web-app PUBLIC
"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd" >
<web-app>
<display-name>Archetype Created Web Application</display-name>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext-*.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
</web-app>
4.4 modify fbs-web
Modify fbs-web of net.wanho.fenbushi.controller.UserController.java
5, start the test
Ensure zookeeper start, dubbo start, start fbs-service, and then start fbs-web, point your browser to: HTTP: // localhost:? 8082 / the User / Query pageNum = 1 & pageSize = 2
At this point, we have completed in distributed projects increased data query module.