MyBatis与Spring设置callSettersOnNulls

<?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"> 

<!-- 
	如果内网机器报错,请使用下面这种笨办法
 -->
<!-- 
<!DOCTYPE configuration
        PUBLIC "-//www.mybatis.org//DTD Config 3.0//EN"
        "E:/bao/tomcat/apache-tomcat-6.0.14/webapps/pmsys/WEB-INF/classes/mybatis/mybatis-3-config.dtd">
 -->

<configuration>
	<settings>
	  <!-- 只设置需要的,其他使用默认值 -->
	  <!-- 开启缓存,默认就是开启的,2层开关,需要在Mapper文件中也指定 cache 标签才会真正使用缓存 -->
	  <setting name="cacheEnabled" value="true"/>
	  <!-- 在null时也调用 setter,适应于返回Map,3.2版本以上可用 -->
	    <setting name="callSettersOnNulls" value="true"/>
	</settings>
</configuration>

public class SqlSessionFactoryBean 
    implements FactoryBean<SqlSessionFactory>, InitializingBean, 
    ApplicationListener<ApplicationEvent> {

  private static final Log logger = LogFactory.getLog(SqlSessionFactoryBean.class);
  // 这里可以配置configLocation资源
  private Resource configLocation;

  private Resource[] mapperLocations;

  private DataSource dataSource;

  private TransactionFactory transactionFactory;
  // 这里可以配置configurationProperties属性
  private Properties configurationProperties;

  ......

  protected SqlSessionFactory buildSqlSessionFactory() throws IOException {

    Configuration configuration;

    XMLConfigBuilder xmlConfigBuilder = null;
    // 先查找 configLocation 属性
    if (this.configLocation != null) {
      xmlConfigBuilder = new XMLConfigBuilder(this.configLocation.getInputStream(), null, this.configurationProperties);
      configuration = xmlConfigBuilder.getConfiguration();
    } else {
      if (logger.isDebugEnabled()) {
        logger.debug("Property ‘configLocation‘ not specified, using default MyBatis Configuration");
      }
      // 如果找不到configLocation,就只使用 configurationProperties
      configuration = new Configuration();
      configuration.setVariables(this.configurationProperties);
    }

    ......

<!-- myBatis配置 -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
	<property name="dataSource" ref="dataSource" />
	
	<!-- 表示在mybatis.mapping包或以下所有目录中，以 Mapper.xml结尾所有文件 -->
	<property name="mapperLocations">
		<value>classpath:com/cncounter/dao/oracle/**/*Mapper.xml</value>
		<!-- 
		<list>
			<value>classpath:com/cncounter/dao/oracle/res/*Mapper.xml</value>
			<value>classpath:com/cncounter/dao/oracle/user/*Mapper.xml</value>
		</list>
		 -->
	</property>
	<!-- 
	<property name="configLocation">
		<value>classpath:mybatis/mybatis-env-setting.xml</value>
	</property>
	 -->
	<!--  切换一种方式,不配置configLocation  -->
	<property name="configurationProperties">
		<props>
			<prop key="cacheEnabled">true</prop>
			<prop key="callSettersOnNulls">true</prop>
		</props>
	</property>
</bean>

MyBatis与Spring设置callSettersOnNulls

原文：http://blog.csdn.net/renfufei/article/details/39646207