在学习mybatis时，发现对配置文件的要求严格，这里进行笔记：
1.mapper.xml与conf.xml文件需要文件头，可以在mybatis的文档里查找到
2.配置mapper.xml
1 <?xml version="1.0" encoding="UTF-8"?> 2 <!DOCTYPE mapper 3 PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" 4 "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> 5 <mapper namespace="pers.yjc.work.mapper.personMapper"> 6 <!-- 没有分号 --> 7 <!-- 查询单个person --> 8 <select id="queryPersonById" resultType="pers.yjc.work.entity.Person" parameterType="int"> 9 select * from person where id = #{id} 10 </select> 11 </mapper>
namespace="pers.yjc.work.mapper.personMapper"这里写mapper.xml的路径，注意是用“.”来分割，末尾不加“.xml”
3.配置conf.xml
1 <?xml version="1.0" encoding="UTF-8" ?> 2 <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" 3 "http://mybatis.org/dtd/mybatis-3-config.dtd"> 4 <configuration> 5 <environments default="development"> 6 <environment id="development"> 7 <transactionManager type="JDBC" /> 8 <dataSource type="POOLED"> 9 <property name="driver" value="com.mysql.cj.jdbc.Driver" /> 10 <property name="url" value="jdbc:mysql://localhost:3306/test?serverTimezone=UTC&useSSL=false" /> 11 <property name="username" value="root" /> 12 <property name="password" value="root123" /> 13 </dataSource> 14 </environment> 15 </environments> 16 <mappers> 17 <mapper resource="pers/yjc/work/mapper/personMapper.xml" /> 18 </mappers> 19 </configuration>
<mappers>
<mapper resource="pers/yjc/work/mapper/personMapper.xml" />
</mappers>
这里也写mapper.xml的路径，不过这里就要用“/”分隔，还要加上后缀