在公司基础框架的基础之上增加多数据源的支持，公司框架底层是用hibernate的，现增加mybatis作为底层的一个新的数据源。
1、增加jar包
基础框架采用spring版本是3.1，所以需要根据此版本加入对应的mybatis版本，分别加入mybatis-spring-1.0.2.jar和mybatis-3.0.6.jar即可。
2、增加spring的mybatis配置文件
<!-- 数据库连接池，使用阿里巴巴开源数据库连接 -->
<bean id="dataSource3" class="com.alibaba.druid.pool.DruidDataSource"
init-method="init" destroy-method="close">
<property name="driverClassName">
<value>oracle.jdbc.driver.OracleDriver</value>
</property>
<property name="url">
<value>jdbc:oracle:thin:@218.15.22.15:1521:orcl</value>
</property>
<property name="username">
<value>callplat123</value>
</property>
<property name="password">
<value>YRwDHYuisdwtEUgxp3rwf8QhYi40hWE+zIWlr6HcmIZfqFRjk662lESHAt0u3vqWFd4XW65yLkJe6M/tQAT88w==</value>
</property>
<!-- 数据库解密 -->
<property name="connectionProperties" value="config.decrypt=true" />
<property name="filters" value="config" />
<property name="maxActive" value="50" />
<property name="initialSize" value="3" />
<property name="maxWait" value="60000" />
<property name="minIdle" value="3" />
<property name="timeBetweenEvictionRunsMillis" value="60000" />
<property name="minEvictableIdleTimeMillis" value="300000" />
<property name="validationQuery" value="SELECT 'x' from DUAL" />
<property name="testWhileIdle" value="true" />
<property name="testOnBorrow" value="false" />
<property name="testOnReturn" value="false" />
<property name="poolPreparedStatements" value="true" />
<property name="maxPoolPreparedStatementPerConnectionSize" value="50" />
</bean>
<bean id="sessionFactory3" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource3" />
<!-- 配置mybatis 数据源、别名等信息
<property name="configLocation" value="classpath:config/mybatis-config-slave.xml" />
-->
<property name="mapperLocations" value="classpath*:com/mybatis/*/mapping/*.xml" />
</bean>
<!-- DAO接口所在包名，Spring会自动查找其下的类 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.mybatis" />
<property name="sqlSessionFactory" ref="sessionFactory3"/>
</bean>
<!-- 事务配置 -->
<bean id="transactionManager3" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource3" />
</bean>
<!-- 事务规则 -->
<tx:advice id="txAdvice3" transaction-manager="transactionManager3">
<tx:attributes>
<tx:method name="add*" propagation="REQUIRED" />
<tx:method name="save*" propagation="REQUIRED" />
<tx:method name="update*" propagation="REQUIRED" />
<tx:method name="modify*" propagation="REQUIRED" />
<tx:method name="delete*" propagation="REQUIRED" />
<tx:method name="*" read-only="true" />
</tx:attributes>
</tx:advice>
<!-- 仅对service包下面的方法开启事务控制 -->
<aop:config>
<aop:pointcut id="interceptorPointCuts3" expression="execution(* com.mybatis..service.*.*(..))" />
<aop:advisor advice-ref="txAdvice3" pointcut-ref="interceptorPointCuts3" />
</aop:config>
3、根据mysql数据库对应表、表到代码的配置文件及依赖的生成工具jar进行生成代码
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
"http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorConfiguration>
<!-- 数据库驱动-->
<classPathEntry location="mysql-connector-java-3.1.14-bin.jar"/>
<context id="DB2Tables" targetRuntime="MyBatis3">
<commentGenerator>
<property name="suppressDate" value="true"/>
<!-- 是否去除自动生成的注释 true：是 ： false:否 -->
<property name="suppressAllComments" value="true"/>
</commentGenerator>
<!--数据库链接URL，用户名、密码 -->
<jdbcConnection driverClass="com.mysql.jdbc.Driver" connectionURL="jdbc:mysql://127.0.0.1:3306/mybatis?useUnicode=true&characterEncoding=utf8" userId="root" password="root">
</jdbcConnection>
<javaTypeResolver>
<property name="forceBigDecimals" value="false"/>
</javaTypeResolver>
<!-- 生成模型的包名和位置-->
<javaModelGenerator targetPackage="com.cn.hnust.entity" targetProject="src">
<property name="enableSubPackages" value="true"/>
<property name="trimStrings" value="true"/>
</javaModelGenerator>
<!-- 生成映射文件的包名和位置-->
<sqlMapGenerator targetPackage="com.cn.hnust.mapping" targetProject="src">
<property name="enableSubPackages" value="true"/>
</sqlMapGenerator>
<!-- 生成DAO的包名和位置-->
<javaClientGenerator type="XMLMAPPER" targetPackage="com.cn.hnust.dao" targetProject="src">
<property name="enableSubPackages" value="true"/>
</javaClientGenerator>
<!-- 要生成的表 tableName是数据库中的表名或视图名 domainObjectName是实体类名-->
<table tableName="user_t" domainObjectName="User" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>
</context>
</generatorConfiguration>
需要依赖到的工具包为mybatis-generator-core-1.3.2.jar和驱动包mysql-connector-java-3.1.14-bin.jar，将jar和配置文件放在一个目录下并在此目录创建src文件夹，打开命令窗口定位到此目录，敲入命令：java -jar mybatis-generator-core-1.3.2.jar -configfile generatorConfig.xml -overwrite 进行生成对应的代码
4、生成的pojo类和xml文件
package com.cn.hnust.entity;
public class User {
private Integer id;
private String userName;
private String password;
private Integer age;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName == null ? null : userName.trim();
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password == null ? null : password.trim();
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
}
pojo 类
<?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.cn.hnust.dao.UserMapper" >
<resultMap id="BaseResultMap" type="com.cn.hnust.entity.User" >
<id column="id" property="id" jdbcType="INTEGER" />
<result column="user_name" property="userName" jdbcType="VARCHAR" />
<result column="password" property="password" jdbcType="VARCHAR" />
<result column="age" property="age" jdbcType="INTEGER" />
</resultMap>
<sql id="Base_Column_List" >
id, user_name, password, age
</sql>
<select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.Integer" >
select
<include refid="Base_Column_List" />
from user_t
where id = #{id,jdbcType=INTEGER}
</select>
<delete id="deleteByPrimaryKey" parameterType="java.lang.Integer" >
delete from user_t
where id = #{id,jdbcType=INTEGER}
</delete>
<insert id="insert" parameterType="com.cn.hnust.entity.User" >
insert into user_t (id, user_name, password,
age)
values (#{id,jdbcType=INTEGER}, #{userName,jdbcType=VARCHAR}, #{password,jdbcType=VARCHAR},
#{age,jdbcType=INTEGER})
</insert>
<insert id="insertSelective" parameterType="com.cn.hnust.entity.User" >
insert into user_t
<trim prefix="(" suffix=")" suffixOverrides="," >
<if test="id != null" >
id,
</if>
<if test="userName != null" >
user_name,
</if>
<if test="password != null" >
password,
</if>
<if test="age != null" >
age,
</if>
</trim>
<trim prefix="values (" suffix=")" suffixOverrides="," >
<if test="id != null" >
#{id,jdbcType=INTEGER},
</if>
<if test="userName != null" >
#{userName,jdbcType=VARCHAR},
</if>
<if test="password != null" >
#{password,jdbcType=VARCHAR},
</if>
<if test="age != null" >
#{age,jdbcType=INTEGER},
</if>
</trim>
</insert>
<update id="updateByPrimaryKeySelective" parameterType="com.cn.hnust.entity.User" >
update user_t
<set >
<if test="userName != null" >
user_name = #{userName,jdbcType=VARCHAR},
</if>
<if test="password != null" >
password = #{password,jdbcType=VARCHAR},
</if>
<if test="age != null" >
age = #{age,jdbcType=INTEGER},
</if>
</set>
where id = #{id,jdbcType=INTEGER}
</update>
<update id="updateByPrimaryKey" parameterType="com.cn.hnust.entity.User" >
update user_t
set user_name = #{userName,jdbcType=VARCHAR},
password = #{password,jdbcType=VARCHAR},
age = #{age,jdbcType=INTEGER}
where id = #{id,jdbcType=INTEGER}
</update>
</mapper>
mybatis-xml配置文件
5、编写单元测试类进行测试表的增删改查
package com.cn.hnust.test;
import javax.annotation.Resource;
import org.apache.log4j.Logger;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import com.cn.hnust.dao.UserMapper;
import com.cn.hnust.entity.User;
@RunWith(SpringJUnit4ClassRunner.class) //表示继承了SpringJUnit4ClassRunner类
@ContextConfiguration(locations = {"classpath:spring-mybatis.xml"})
public class TestMyBatis {
private static Logger logger = Logger.getLogger(TestMyBatis.class);
@Resource
private UserMapper userMapper;
@Test
public void test() {
logger.info("测试方法");
try {
User user = userMapper.selectByPrimaryKey(new Integer(1));
logger.info("user:"+user);
if(user != null){
System.out.println(user.getUserName()+":"+user.getPassword());
}
user.setAge(100);
user.setUserName("我是中国人");
userMapper.updateByPrimaryKey(user);
} catch (Exception e) {
e.printStackTrace();
logger.error(e);
}
}
}
至此，一个简单SpringMVC3+Mybatis3整合到此结束！
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