项目实录之集成Mybatis

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阅读本文之前建议先阅读如下两篇文章

• 项目实录之Maven工程搭建

• 项目实录之集成Spring MVC

一、创建数据库和表

先创建数据库wangci,再创建一个表user（仅仅测试用）,完成之后随意插几条数据进去。

CREATE TABLE `user` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT,
  `username` varchar(20) NOT NULL,
  `password` varchar(20) NOT NULL,
  PRIMARY KEY (`id`,`username`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8

二、pom.xml中加入Mybatis和MySQL相关依赖
      

<project xmlns="http://maven.apache.org/POM/4.0.0" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"        
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
http://maven.apache.org/maven-v4_0_0.xsd">        
    <modelVersion>4.0.0</modelVersion>        
    <groupId>wang.wangci</groupId>        
    <artifactId>bottae-parent</artifactId>        
    <packaging>pom</packaging>        
    <version>1.0</version>        
    <name>bottae-parent</name>        
    <url>http://maven.apache.org</url>        
    <modules>
        <module>bottae-common</module>                 
        <module>bottae-dao</module>                
        <module>bottae-service</module>                
        <module>bottae-web</module>        
    </modules>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <spring.version>3.2.3.RELEASE</spring.version>
    </properties>
        <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.0</version>
                <configuration>
                    <source>1.6</source>
                    <target>1.6</target>
                    <encoding>${project.build.sourceEncoding}</encoding>
                </configuration>
            </plugin>
            <!-- jetty插件 -->
            <plugin>
                <groupId>org.mortbay.jetty</groupId>
                <artifactId>jetty-maven-plugin</artifactId>
                <version>8.1.11.v20130520</version>
                <configuration>
                    <scanIntervalSeconds>0</scanIntervalSeconds>
                    <connectors>
                        <connector implementation="org.eclipse.jetty.server.nio.SelectChannelConnector">
                            <port>7777</port>
                        </connector>
                    </connectors>
                </configuration>
            </plugin>
        </plugins>
                <resources>
            <resource>
                <directory>src/main/resources</directory>
                <filtering>true</filtering>
            </resource>
        </resources>
    </build>
    <dependencies>
        <!-- spring start -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context-support</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>${spring.version}</version>
        </dependency>
          <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-beans</artifactId>
        <version>${spring.version}</version>
    </dependency>
           <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-orm</artifactId>
        <version>${spring.version}</version>
    </dependency>
    <!-- spring 依賴jackson -->
    <dependency>
            <groupId>org.codehaus.jackson</groupId>
            <artifactId>jackson-mapper-asl</artifactId>
            <version>1.9.7</version>
        </dependency>
    <!-- spring end -->
    
    <dependency>
            <groupId>javax</groupId>
            <artifactId>javaee-api</artifactId>
            <version>6.0</version>
            <scope>provided</scope>
        </dependency>
        
            <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.25</version>
        </dependency>
        
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.1.1</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.1.1</version>
        </dependency>
        
        <dependency>
            <groupId>com.mchange</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.5-pre8</version>
        </dependency>
    </dependencies>
    
    <profiles>
        <profile>
            <id>DEV</id>
            <properties>
                <dao.jdbc.url>10.236.121.48</dao.jdbc.url>
                <dao.jdbc.port>3306</dao.jdbc.port>
                <dao.jdbc.schema>wangci</dao.jdbc.schema>
                <dao.jdbc.user>root</dao.jdbc.user>
                <dao.jdbc.password>root</dao.jdbc.password>
            </properties>
                <activation>
                    <activeByDefault>true</activeByDefault>
                </activation>
        </profile>
    </profiles>
</project>

 
三、dao层配置
    

1、在dao层resources目录下新建文件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>  
</configuration>

2、在resources目录下新建jdbc.properties文件

c3p0.driverClass=com.mysql.jdbc.Driver
c3p0.jdbcUrl=jdbc:mysql://${dao.jdbc.url}:${dao.jdbc.port}/${dao.jdbc.schema}?useUnicode=
true&characterEncoding=utf8&mysqlEncoding=utf8&zeroDateTimeBehavior=convertToNull
c3p0.user=${dao.jdbc.user}
c3p0.password=${dao.jdbc.password}
c3p0.acquireIncrement=1
c3p0.maxIdleTime=30
c3p0.minPoolSize=10
c3p0.maxPoolSize=100
c3p0.initialPoolSize=10

3、修改context-dao.xml，新增数据库相关配置

<?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:aop="http://www.springframework.org/schema/aop"
    xmlns:tx="http://www.springframework.org/schema/tx" 
    xmlns:jdbc="http://www.springframework.org/schema/jdbc"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="
     http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
     http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
     http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.0.xsd
     http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
     http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">
    <context:annotation-config />
    
        <context:property-placeholder location="classpath:jdbc.properties"
        ignore-unresolvable="true" />
        
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${c3p0.driverClass}"></property>
        <property name="jdbcUrl" value="${c3p0.jdbcUrl}"></property>
        <property name="user" value="${c3p0.user}"></property>
        <property name="password" value="${c3p0.password}"></property>
        <property name="acquireIncrement" value="${c3p0.acquireIncrement}"></property>
        <property name="initialPoolSize" value="${c3p0.initialPoolSize}"></property>
        <property name="maxIdleTime" value="${c3p0.maxIdleTime}"></property>
        <property name="maxPoolSize" value="${c3p0.maxPoolSize}"></property>
        <property name="minPoolSize" value="${c3p0.minPoolSize}"></property>
        <property name="acquireRetryDelay" value="1000"></property>
        <property name="acquireRetryAttempts" value="60"></property>
        <property name="breakAfterAcquireFailure" value="false"></property>
    </bean>
    <bean id="transactionManager"
        class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource" />
    </bean>
    
        <!-- 使用annotation定义事务 @Transactional -->
    <tx:annotation-driven transaction-manager="transactionManager" />
    
    <!-- 配置SqlSessionFactoryBean  -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <property name="configLocation" value="classpath:mybatis-config.xml" />
        <property name="mapperLocations" value="classpath:context/mybatis/*Mapper.xml" />
        <property name="typeAliasesPackage" value="wang.wangci.bottae.dao.mapper" />
    </bean>
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="wang.wangci.bottae.dao.mapper" /> 
    </bean> 
    
</beans>

四、编写代码

1、在dao层新建wang.wangci.bottae.dao.entity.User类
 

package wang.wangci.bottae.dao.entity;
public class User {
    private long id;
    private String username;
    private String password;
    public long getId() {
        return id;
    }
    public void setId(long id) {
        this.id = id;
    }
    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    
}

 
2、dao层新增接口wang.wangci.bottae.dao.mapper.UserMapper

package wang.wangci.bottae.dao.mapper;
import java.util.List;
import org.apache.ibatis.annotations.Param;
import wang.wangci.bottae.dao.entity.User;
public interface UserMapper {
    public List<User> selects();
    
    public User selectById(@Param("id")long id);
    
}

 
3、在dao层resources/context文件夹下新建mybatis文件夹，新建接口UserMapper的映射文件UserMapper.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="wang.wangci.bottae.dao.mapper.UserMapper">
        
    <select id="selects" resultType="wang.wangci.bottae.dao.entity.User">
        SELECT *    FROM user
    </select>
    <select id="selectById" resultType="wang.wangci.bottae.dao.entity.User">
        SELECT *    FROM user WHERE id=#{id}
    </select>
</mapper>

4、在service层新建wang.wangci.bottae.service.UserService接口

package wang.wangci.bottae.service;
import java.util.List;
import wang.wangci.bottae.dao.entity.User;
public interface UserService {
    public List<User> finds();
    
    public User findById(long id);
}

5、在service层新建wang.wangci.bottae.service.impl.UserServiceImpl类

package wang.wangci.bottae.service.impl;
import java.util.List;
import javax.annotation.Resource;
import org.springframework.stereotype.Component;
import wang.wangci.bottae.dao.entity.User;
import wang.wangci.bottae.dao.mapper.UserMapper;
import wang.wangci.bottae.service.UserService;
@Component
public class UserServiceImpl implements UserService {
    
    @Resource
    private UserMapper userMapper;
    @Override
    public List<User> finds() {
        return userMapper.selects();
    }
    @Override
    public User findById(long id) {
        return userMapper.selectById(id);
    }
}

6、在web层新建wang.wangci.bottae.web.controllers.UserController类

package wang.wangci.bottae.web.controllers;
import java.util.List;
import javax.annotation.Resource;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import wang.wangci.bottae.dao.entity.User;
import wang.wangci.bottae.service.UserService;
@Controller
@RequestMapping("/user")
public class UserController {
    @Resource
    private UserService userService;
    
    @ResponseBody
    @RequestMapping("/gets")
    public List<User> gets(){
        return userService.finds(); 
    }
    
    @ResponseBody
    @RequestMapping("/get")
    public User get(@RequestParam long id){
        return userService.findById(id);    
    }
    
    
}

 五、编译运行

命令行下执行下面命令启动服务：

mvn clean install 
cd bottae-web
mvn jetty:run

访问http://localhost:7777/user/gets，如果将数据库user查询出来了，说明成功了
访问http://localhost:7777/user/get?id=1，如果将id为1的user查询出来了，说明成功了 

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项目实录之集成Mybatis

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原文地址：http://my.oschina.net/funga/blog/484987