完成MyBatis的Demo

Author: fishedee

mybatis/mybatis_1/.idea/workspace.xml

@@ -66,6 +66,12 @@ public void test1(){
         logger.info("country pointer : {}, country2 pointer: {}",System.identityHashCode(country),System.identityHashCode(country2));
         logger.info("country name: {}, country2 name: {}",country.countryName,country2.countryName);
 
+        //这一步有查询数据库,因为selectById和selectById2是不同的方法
+        Country country2_2 = countryMapper.selectById2(1L);
+
+        logger.info("country pointer : {}, country2_2 pointer: {}",System.identityHashCode(country),System.identityHashCode(country2_2));
+        logger.info("country name: {}, country2_2 name: {}",country.countryName,country2_2.countryName);
+
         //但是,在同一个事务里面,用其他方法就不会返回这个对象.
         //所以,一级缓存总是以方法和参数作为缓存的key
         showCountryList();

mybatis/mybatis_1/target/classes/mybatis_test/App.class

@@ -14,5 +14,6 @@
 public interface CountryMapper {
     List<Country> selectAll();
     Country selectById(@Param("id")Long countryId);
+    Country selectById2(@Param("id")Long countryId);
     int insertList(List<Country> countryList);
 }

mybatis/mybatis_2/.idea/workspace.xml

@@ -8,6 +8,9 @@
     <select id="selectById" resultType="Country">
         select id,countryName,countryCode,createTime,modifyTime from t_country where id = #{id};
     </select>
+    <select id="selectById2" resultType="Country">
+        select id,countryName,countryCode,createTime,modifyTime from t_country where id = #{id};
+    </select>
     <insert id="insertList" useGeneratedKeys="true" keyProperty="id">
         insert into t_country(countryName,countryCode) VALUES
         <foreach collection="list" item="country" separator=",">

mybatis/mybatis_3/.idea/workspace.xml

@@ -8,6 +8,9 @@
     <select id="selectById" resultType="Country">
         select id,countryName,countryCode,createTime,modifyTime from t_country where id = #{id};
     </select>
+    <select id="selectById2" resultType="Country">
+        select id,countryName,countryCode,createTime,modifyTime from t_country where id = #{id};
+    </select>
     <insert id="insertList" useGeneratedKeys="true" keyProperty="id">
         insert into t_country(countryName,countryCode) VALUES
         <foreach collection="list" item="country" separator=",">