mybatis(一)--sqlMapConfig.xm文件配置

Dear 丶 2022-04-22 15:28 233阅读 0赞

mybatis最核心的一个文件则是sqlMapConfig.xml文件(也可以不是这个文件)，java程序在创建sqlSessionFactory时，则需要读入这个文件，通过sqlSessionFactoryBuilder().build()方式创建一个sqlSessionFactory，然后通过sqlSessionFactory来进行sqlSessionFactory.openSession()操作来创建一个sqlSession，sqlSession则是面向用户(程序员)操作的入口，具体视图及流程结构图如下表所示：

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一个详细的sqlMapconfig.xml配置如下：

<?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">
    		
    		
    	</properties>
    	
    	<settings>
    	  <setting name="lazyLoadingEnabled" value="true"/>
    	  <setting name="aggressiveLazyLoading" value="false"/>
    	  <setting name="cacheEnabled" value="true" />
    	</settings>
    	
    	
    	<typeAliases>
    		
    		
    		
    		
    		<package name="cn.itcast.mybatis.po"/>
    		
    	</typeAliases>
    	
    	
    	<environments default="development">
    		<environment id="development">
    		
    			<transactionManager type="JDBC" />
    		
    			<dataSource type="POOLED">
    				<property name="driver" value="${jdbc.driver}" />
    				<property name="url" value="${jdbc.url}" />
    				<property name="username" value="${jdbc.username}" />
    				<property name="password" value="${jdbc.password}" />
    			</dataSource>
    		</environment>
    	</environments>
    	
    	<mappers>
    	
    		
    		
    		
    		
    		
    		
    		
    		<package name="cn.itcast.mybatis.mapper"/>
    
    	</mappers>
    	
    	
    </configuration>

别名的配置：

其中 在sqlMapconfig.xml文件中 可以配置别名：

在sqlMapConfig.xml文件中引用该别名:

批量定义别名：

指定包名，mybatis自动扫描包中的po类，自动定义别名，别名就是类名（首字母大写或者小写都可以）

sqlMapConfig.xml文件中配置mapper接口的映射文件  <mappers >  ........</mappers>中进行配置

可以通过加入<mapper resource="mapper/UserMapper.xml">文件来指定一个mapp的xml映射文件

也可以通过加入<mapper class="com.test.mapper.testMapper">来指定一个mapper类，但是得遵循一些规范：需要将mapper接口类名和mapper.xml映射文件名称保持一致，且在一个目录 中  
        上边规范的前提是：使用的是mapper代理方法

也可以扫描整个包 来加载进入该包中所有的mapper.java及mapper.xml文件，是得遵循一些规范：需要将mapper接口类名和mapper.xml映射文件名称保持一致，且在一个目录 中

<package  name="com.test.mapper">

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