类型还是匹配下主键类型的好,都去抛强转异常吧.

mybatis-plus-core/src/main/java/com/baomidou/mybatisplus/core/injector/methods/SelectById.java

@@ -37,7 +37,7 @@ public class SelectById extends AbstractMethod {
     public MappedStatement injectMappedStatement(Class<?> mapperClass, Class<?> modelClass, TableInfo tableInfo) {
         SqlMethod sqlMethod = SqlMethod.SELECT_BY_ID;
         SqlSource sqlSource = new RawSqlSource(configuration, String.format(sqlMethod.getSql(), this.sqlSelectColumns(tableInfo, false),
-            tableInfo.getTableName(), tableInfo.getKeyColumn(), tableInfo.getKeyProperty()), Object.class);
+            tableInfo.getTableName(), tableInfo.getKeyColumn(), tableInfo.getKeyProperty()), modelClass);
         return this.addSelectMappedStatement(mapperClass, sqlMethod.getMethod(), sqlSource, modelClass, tableInfo);
     }
 }

mybatis-plus-extension/src/main/java/com/baomidou/mybatisplus/extension/injector/methods/LogicSelectById.java

@@ -37,7 +37,7 @@ public class LogicSelectById extends AbstractLogicMethod {
         SqlMethod sqlMethod = SqlMethod.LOGIC_SELECT_BY_ID;
         SqlSource sqlSource = new RawSqlSource(configuration, String.format(sqlMethod.getSql(), sqlSelectColumns(tableInfo, false),
             tableInfo.getTableName(), tableInfo.getKeyColumn(), tableInfo.getKeyProperty(),
-            tableInfo.getLogicDeleteSql(true, false)), Object.class);
+            tableInfo.getLogicDeleteSql(true, false)), modelClass);
         return addSelectMappedStatement(mapperClass, sqlMethod.getMethod(), sqlSource, modelClass, tableInfo);
     }
 }