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package com.ssm.mapper ;
import com.ssm.entity.Demo ;
import org.apache.ibatis.annotations.Param ;
import java.util.List ;
//操作mybatis的接口
public interface DemoMapper {
/*
* 约定1: 方法名和mapper.xml中标签的id值相同
* 约定2: 方法的输入参数和mapper.xml中标签的parameterType的类型一致
* 约定3: 方法的返回值和mapper.xml中标签的resultType的类型一致
* 还需: namespace值是接口全类名( 接口中的方法和mapper.xml中SQL标签一一对应)
* 匹配(约定)过程:
* 1.根据接口类名找到mapper.xml文件( namespace=接口全类名)
* 2.根据接口的方法名找到mapper.xml文件中SQL标签( 方法名=SQL标签id值)
* 习惯: SQL映射文件( studentMapper.xml) 和接口放在同一个包下(注意修改config.xml)
*/
//方法的三要素:返回值 方法名(参数列表)
Demo getDemoById ( Integer id ) ;
List < Demo > getDemoAll ( @Param ( "param1" ) int beginPage , @Param ( "param2" ) int limitpage ) ;
void addDemo ( Demo demo ) ;
void updateDemo ( Demo demo ) ;
void deleteDemoById ( Integer id ) ;
void deleteDemoAll ( ) ;
Integer countTotlePage ( ) ;
Demo findDemoByDid ( Integer id ) ;
List < Demo > searchDemoByCondition ( String condition ) ;
List < Demo > findDemoByDId ( Integer did ) ;
}