MyBatis: 自定义ObjectFactory

冷不防 2023-03-03 11:25 12阅读 0赞

1.创建DefaultObjectFactory的子类

package factory;
    
    
    import java.util.List;
    import java.util.Properties;
    
    import org.apache.ibatis.reflection.factory.DefaultObjectFactory;
    
    import tju.MyBtsBasic.domain.Book;
    
    public class AmadeusObjectFactory extends DefaultObjectFactory{
    	String author;
    	
    	static
    	{
    		System.out.println("in my diy object factory......");
    	}
    	
    	@Override
    	public Object create(Class type) {
    	    return super.create(type);
    	  }
    
    	  public Object create(Class type, List constructorArgTypes, List constructorArgs) {
    	    Class<?> classToCreate = resolveInterface(type);
    	    @SuppressWarnings("unchecked")
    	    // we know types are assignable
    	    Object created = super.create(classToCreate, constructorArgTypes, constructorArgs);
    	    advice(created);
    	    return created;
    	  }
    
    	  public void setProperties(Properties properties) {
    	    author=properties.getProperty("author");
    	  }
    	  
    	  public Object advice(Object object)
    	  {
    		  if(Book.class.isAssignableFrom(object.getClass()))
    				  {
    			        Book b=(Book)object;
    			        b.setAuthor(author);
    			        
    			        
    				  }
    		  return object;
    		  
    	  }
    	
    	
    
    }

2.配置自定义ObjectFactory

<?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>
    	
    	<properties resource="db.properties">
    	<property name="password" value="root"/>
    	</properties>
    	
    	
    	<settings>
    		<setting name="logImpl" value="LOG4J"/>
    		
    		<setting name="lazyLoadingEnabled" value="true"/>
    		<setting name="aggressiveLazyLoading" value="false"/>
    		
    		<setting name="defaultExecutorType" value="SIMPLE"/>
    	</settings>
    	
    	<objectFactory type="factory.AmadeusObjectFactory">
    	<property name="author" value="liuxueyuan"/>
    	</objectFactory>
    	
    	<environments default="mysql">
    	
        <environment id="mysql">
                 <transactionManager type="JDBC"></transactionManager>
                 <dataSource type="factory.c3p0DataSourceFactory">
                     <property name="driverClass" value="com.mysql.jdbc.Driver"/>
                     <property name="jdbcUrl" value="jdbc:mysql://127.0.0.1:3306/mybatis"/>
                     <property name="user" value="${username}"/>
                    <property name="password" value="${password}"/>
                     <property name="initialPoolSize" value="5"/>
                     <property name="maxPoolSize" value="20"/>
                     <property name="minPoolSize" value="5"/>
                 </dataSource>
             </environment>
      </environments>
      
      <mappers>
      	
      	<mapper class="tju.MyBtsBasic.mapper.BookMapper"/>
      
      </mappers>
    </configuration>