mybatis 3.2.7 与 spring mvc 3.x、logback整合
github上有一个Mybatis-Spring的项目,专门用于辅助完成mybatis与spring的整合,大大简化了整合难度,使用步骤:
准备工作:
maven依赖项:
<properties>
<java-version>1.6</java-version>
<spring.version>3.2.8.RELEASE</spring.version>
</properties>
<dependencies> <!-- Spring -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${spring.version}</version>
</dependency> <dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-expression</artifactId>
<version>${spring.version}</version>
</dependency> <dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>${spring.version}</version>
</dependency> <dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${spring.version}</version>
</dependency> <dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring.version}</version>
</dependency> <dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-oxm</artifactId>
<version>${spring.version}</version>
</dependency> <dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>${spring.version}</version>
</dependency> <dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>${spring.version}</version>
</dependency> <dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>${spring.version}</version>
</dependency> <dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.7.3</version>
</dependency> <dependency>
<groupId>aopalliance</groupId>
<artifactId>aopalliance</artifactId>
<version>1.0</version>
</dependency> <!-- json -->
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-mapper-asl</artifactId>
<version>1.9.3</version>
</dependency> <dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-jaxrs</artifactId>
<version>1.9.9-redhat-2</version>
</dependency> <!-- logback -->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.7.7</version>
</dependency> <dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-core</artifactId>
<version>1.1.2</version>
</dependency> <dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
<version>1.1.2</version>
</dependency> <dependency>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
<version>1.1.3</version>
</dependency> <!-- Servlet -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
<scope>provided</scope>
</dependency> <!-- oracle -->
<dependency>
<groupId>com.oracle</groupId>
<artifactId>ojdbc6</artifactId>
<version>11.2.0.3</version>
</dependency> <!-- mybatis -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.2.2</version>
</dependency> <dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.2.7</version>
</dependency> </dependencies>
一、先创建entity类
package com.cnblogs.yjmyzz.entity; import java.io.Serializable; public class BasCarrierEntity implements Serializable { private static final long serialVersionUID = -971818065984481747L; private int recId;
private int cyear;
private String carrier; public int getRecId() {
return recId;
} public void setRecId(int recId) {
this.recId = recId;
} public int getCyear() {
return cyear;
} public void setCyear(int cyear) {
this.cyear = cyear;
} public String getCarrier() {
return carrier;
} public void setCarrier(String carrier) {
this.carrier = carrier;
} public String toString() {
return "recid:" + recId + ",cyear:" + cyear + ",carrier:" + carrier;
} }
这是一个POJO类,没有任何花头.
二、创建Mapper接口
package com.cnblogs.yjmyzz.mybatis.mapper; import com.cnblogs.yjmyzz.entity.BasCarrierEntity; public interface CarrierMapper { BasCarrierEntity getCarrierById(int recId); void insertCarrier(BasCarrierEntity entity); void deleteCarrier(BasCarrierEntity entity); }
相当于传统ORM数据库应用里的DAO层接口
三、定义sql映射文件 BasCarrier.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.cnblogs.yjmyzz.mybatis.mapper.CarrierMapper"> <cache /> <select id="getCarrierById" resultType="BasCarrierEntity"
parameterType="int">
select t.recid recId,t.cyear cyear,t.carrier carrier
from T_BAS_CARRIER t where
t.recid = #{recId}
</select> <insert id="insertCarrier" parameterType="BasCarrierEntity">
<selectKey keyProperty="recId" order="BEFORE" resultType="int">
select seq_t_bas_carrier.nextval as recId from dual
</selectKey>
insert into
t_bas_carrier(recid,cyear,carrier)
values(#{recId,jdbcType=NUMERIC},#{cyear,jdbcType=NUMERIC},#{carrier,jdbcType=VARCHAR})
</insert> <delete id="deleteCarrier" parameterType="BasCarrierEntity">
delete from
t_bas_carrier where 1=1
<if test="carrier != null">
and carrier like #{carrier}
</if>
</delete> </mapper>
以上这三板斧是必不可少的,注:xml中sql语句的id要与mapper接口中的方法名完全相同,这样不用其它任何额外配置,运行时,mybatis就能自动将接口中的方法与sql关联起来。
四、Spring-Database.xml 配置文件
<?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"
default-autowire="byName"> <bean id="dataSource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="oracle.jdbc.driver.OracleDriver" />
<property name="url" value="${db-url}" />
<property name="username" value="${db-username}" />
<property name="password" value="${db-password}" />
</bean> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<!-- mybatis主配置文件,不能与后面的mapperLocations/typeAliasesPackage同时使用 -->
<!-- <property name="configLocation" value="classpath:mybatis-config.xml"></property> -->
<property name="dataSource" ref="dataSource" />
<!-- mapper中的类型别名 -->
<property name="typeAliasesPackage" value="com.cnblogs.yjmyzz.entity"></property>
<!-- mybatis 映射sql xml路径 -->
<property name="mapperLocations" value="classpath:mybatis/**/*.xml"></property>
</bean> <!-- 扫描指定包下的Mapper,自动创建mapper bean实例 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.cnblogs.yjmyzz.mybatis.mapper" />
</bean> <!-- 事务管理 -->
<bean id="transactionManager"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource" />
</bean> <tx:advice id="txAdvice" transaction-manager="transactionManager">
<tx:attributes>
<!-- 仅do开头的Service层方法,发生Exception异常时,才会事务回滚 -->
<tx:method name="do*" read-only="false" rollback-for="java.lang.Exception" />
<!-- 其它方法,只读事务,不回滚 -->
<tx:method name="*" propagation="SUPPORTS" read-only="true" />
</tx:attributes>
</tx:advice> <aop:config>
<!-- 仅拦截service层方法 -->
<aop:pointcut id="pc"
expression="execution(* com.cnblogs.yjmyzz.service..*.*(..))" />
<aop:advisor pointcut-ref="pc" advice-ref="txAdvice" />
</aop:config> <!-- <tx:annotation-driven /> -->
</beans>
真正属于mybatis专用的配置是22-35行,其它都是些db开发的常规配置。
事务这里有一个要特别注意的问题:因为Spring/SpringMVC的父子容器问题,默认情况下@Service的xxxService并不具备增加事务处理能力,需要做点特殊配置
a) spring-mvc servlet的配置文件里,参考下面配置:
<context:component-scan base-package="com.cnblogs.yjmyzz">
<context:exclude-filter type="annotation"
expression="org.springframework.stereotype.Service" />
</context:component-scan>
即:将@Service所对应的Service类排除掉,因为Spring-MVC compent-scan注入的只是普通的bean,不具备增加事务处理能力,所以要排除掉.
b) spring 主配置文件里,参考下面配置:
<context:component-scan base-package="com.cnblogs.yjmyzz">
</context:component-scan>
这样处理后,compent-scan扫描到的Service类,就交由Spring,而非Spring-MVC来注入了。
另外还有一个事务自动提交的问题,虽然在配置中已经明确指定了仅Service层do开头的方法,才支持可写事务,其它方法都是只读事务,但如果你运行一下会发现,其它非do开头的方法如果执行一条insert语句,仍然会提交成功。
造成这个的原因在于datasource,这里我们采用的是org.springframework.jdbc.datasource.DriverManagerDataSource数据源,这种数据源不支持defaultAutoCommit属性,如果不想使用自动提交,可以把datasource节点换成
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close">
<property name="driverClassName" value="oracle.jdbc.driver.OracleDriver" />
<property name="url" value="${db-url}" />
<property name="username" value="${db-username}" />
<property name="password" value="${db-password}" />
<property name="defaultAutoCommit" value="false" />
<property name="initialSize" value="2" />
<property name="maxActive" value="5" />
<property name="maxWait" value="60000" />
</bean>
注意第7行,defaultAutoCommit设置成false即可
如果使用Oracle,事务这里还有一个小坑,read-only不管设置成true/false,效果都是一样的,原因见:http://docs.oracle.com/cd/B19306_01/java.102/b14355/apxtips.htm
Transaction Isolation Levels and Access Modes
Read-only connections are supported by the Oracle server, but not by the Oracle JDBC drivers.
即:使用oracle jdbc驱动时,不支持read-only属性
五、mybatis在eclipse控制台显示sql语句的问题
mybatis支持多种日志组件,默认顺序如下:
• SLF4J
• Apache Commons Logging
• Log4j 2
• Log4j
• JDK logging
而上一篇刚学习的logback组件,正好是SLF4J的实现之一,所以如果采用logback来记录日志,mybatis不用做任何额外配置,将logback.xml扔在resource目录下即可
<?xml version="1.0" encoding="UTF-8" ?>
<configuration scan="true" scanPeriod="1800 seconds"
debug="false"> <property name="USER_HOME" value="logs" />
<property scope="context" name="FILE_NAME" value="mybatis-logback" /> <timestamp key="byDay" datePattern="yyyy-MM-dd" /> <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
</pattern>
</encoder>
</appender> <appender name="file"
class="ch.qos.logback.core.rolling.RollingFileAppender">
<file>${USER_HOME}/${FILE_NAME}.log</file> <rollingPolicy class="ch.qos.logback.core.rolling.FixedWindowRollingPolicy">
<fileNamePattern>${USER_HOME}/${byDay}/${FILE_NAME}-${byDay}-%i.log.zip
</fileNamePattern>
<minIndex>1</minIndex>
<maxIndex>10</maxIndex>
</rollingPolicy> <triggeringPolicy
class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy">
<maxFileSize>5MB</maxFileSize>
</triggeringPolicy>
<encoder>
<pattern>%-4relative [%thread] %-5level %logger{35} - %msg%n
</pattern>
</encoder> </appender> <logger name="com.cnblogs.yjmyzz" level="debug" additivity="true">
<appender-ref ref="file" />
<!-- <appender-ref ref="STDOUT" /> -->
</logger> <root level="debug">
<appender-ref ref="STDOUT" />
</root>
</configuration>
注:log的level要设置成DEBUG。
logback与spring mvc整合的方法,上一篇已经讲过,就不再重复了,这里只给出web.xml的配置
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<context-param>
<param-name>logbackConfigLocation</param-name>
<param-value>classpath:logback.xml</param-value>
</context-param>
<listener>
<listener-class>com.cnblogs.yjmyzz.util.LogbackConfigListener</listener-class>
</listener> <context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:root-context.xml</param-value>
</context-param>
<filter>
<filter-name>CharacterEncodingFilter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>utf-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>CharacterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<servlet>
<servlet-name>appServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:servlet-context.xml</param-value>
</init-param>
<load-on-startup>0</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>appServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping> </web-app>
示例源码:Spring-MVC-REST-MyBatis.zip
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