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add a test to reproduce problem of enum type handler
MyBatis cannot find the type handler for an enum when 1. the enum value has methods, 2. no parameterType is provided in corresponding insert mappers
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‎src/test/java/org/apache/ibatis/submitted/enum_with_method/CreateDB.sql

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--
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-- Copyright 2009-2019 the original author or authors.
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--
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-- Licensed under the Apache License, Version 2.0 (the "License");
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-- you may not use this file except in compliance with the License.
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-- You may obtain a copy of the License at
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--
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-- http://www.apache.org/licenses/LICENSE-2.0
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--
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-- Unless required by applicable law or agreed to in writing, software
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-- distributed under the License is distributed on an "AS IS" BASIS,
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-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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-- See the License for the specific language governing permissions and
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-- limitations under the License.
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--
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drop table users if exists;
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create table users (
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id int,
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name varchar(20),
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cur varchar(20)
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);
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insert into users (id, name, cur) values(1, 'User1', 'RMB');

‎src/test/java/org/apache/ibatis/submitted/enum_with_method/Currency.java

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/*
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* Copyright 2009-2019 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.ibatis.submitted.enum_with_method;
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import java.math.BigDecimal;
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public enum Currency {
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Dollar {
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@Override
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public BigDecimal getExchange() {
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return null;
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}
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},
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RMB {
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@Override
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public BigDecimal getExchange() {
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return null;
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}
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};
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public abstract BigDecimal getExchange();
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}

‎src/test/java/org/apache/ibatis/submitted/enum_with_method/EnumWithMethodTest.java

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/*
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* Copyright 2009-2019 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.ibatis.submitted.enum_with_method;
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import java.io.Reader;
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import org.apache.ibatis.BaseDataTest;
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import org.apache.ibatis.io.Resources;
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import org.apache.ibatis.session.SqlSession;
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import org.apache.ibatis.session.SqlSessionFactory;
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import org.apache.ibatis.session.SqlSessionFactoryBuilder;
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import org.junit.jupiter.api.Assertions;
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import org.junit.jupiter.api.BeforeAll;
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import org.junit.jupiter.api.Test;
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class EnumWithMethodTest {
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private static SqlSessionFactory sqlSessionFactory;
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@BeforeAll
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static void setUp() throws Exception {
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// create an SqlSessionFactory
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try (Reader reader = Resources
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.getResourceAsReader("org/apache/ibatis/submitted/enum_with_method/mybatis-config.xml")) {
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sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
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}
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// populate in-memory database
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BaseDataTest.runScript(sqlSessionFactory.getConfiguration().getEnvironment().getDataSource(),
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"org/apache/ibatis/submitted/enum_with_method/CreateDB.sql");
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}
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@Test
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void shouldGetAUser() {
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try (SqlSession sqlSession = sqlSessionFactory.openSession()) {
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Mapper mapper = sqlSession.getMapper(Mapper.class);
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User user = mapper.getUser(1);
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Assertions.assertEquals("User1", user.getName());
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}
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}
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@Test
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void shouldInsertAUser() {
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try (SqlSession sqlSession = sqlSessionFactory.openSession()) {
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Mapper mapper = sqlSession.getMapper(Mapper.class);
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User user = new User();
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user.setId(2);
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user.setName("User2");
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user.setCur(Currency.Dollar);
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mapper.insertUser(user);
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}
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}
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}

‎src/test/java/org/apache/ibatis/submitted/enum_with_method/Mapper.java

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/*
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* Copyright 2009-2019 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.ibatis.submitted.enum_with_method;
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public interface Mapper {
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User getUser(Integer id);
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void insertUser(User user);
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}

‎src/test/java/org/apache/ibatis/submitted/enum_with_method/Mapper.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<!--
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Copyright 2009-2019 the original author or authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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<!DOCTYPE mapper
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PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
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"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
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<mapper namespace="org.apache.ibatis.submitted.enum_with_method.Mapper">
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<select id="getUser" resultType="org.apache.ibatis.submitted.enum_with_method.User">
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select *
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from users
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where id = #{id}
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</select>
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<!-- without parameterType="org.apache.ibatis.submitted.enum_with_method.User" -->
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<insert id="insertUser">
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insert into users
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values (#{id}, #{name}, #{cur})
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</insert>
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</mapper>

‎src/test/java/org/apache/ibatis/submitted/enum_with_method/User.java

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/*
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* Copyright 2009-2019 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.ibatis.submitted.enum_with_method;
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public class User {
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private Integer id;
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private String name;
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private Currency cur;
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public Integer getId() {
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return id;
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}
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public void setId(Integer id) {
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this.id = id;
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}
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public String getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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public Currency getCur() {
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return cur;
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}
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public void setCur(Currency cur) {
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this.cur = cur;
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}
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}

‎src/test/java/org/apache/ibatis/submitted/enum_with_method/mybatis-config.xml

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<?xml version="1.0" encoding="UTF-8" ?>
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<!--
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Copyright 2009-2019 the original author or authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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<!DOCTYPE configuration
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PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
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"http://mybatis.org/dtd/mybatis-3-config.dtd">
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<configuration>
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<environments default="development">
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<environment id="development">
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<transactionManager type="JDBC">
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<property name="" value="" />
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</transactionManager>
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<dataSource type="UNPOOLED">
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<property name="driver" value="org.hsqldb.jdbcDriver" />
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<property name="url" value="jdbc:hsqldb:mem:enumwithmethod" />
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<property name="username" value="sa" />
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</dataSource>
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</environment>
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</environments>
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<mappers>
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<mapper class="org.apache.ibatis.submitted.enum_with_method.Mapper" />
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</mappers>
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</configuration>

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