後端架構學習-----mybatis（使用mybatis架構遇到的問題）

1、配置檔案沒有注冊（解決：在核心配置檔案中注冊mapper，注冊有三種形式。資源路徑用斜杆，包和類用點）

<mappers>
        <!--每一個mapper.xml檔案都需要在mybatis核心配置檔案中被注冊-->
        <mapper resource="com/zheng/Dao/UserMapper.xml"></mapper>

    </mappers>      

2、綁定接口錯誤（解決：在mapper.xml檔案中，namespace是要實作的接口類）

<mapper namespace="com.zheng.Dao.UserMapper">      

3、方法名不對（解決：id是接口中對應的方法名）

<select id="selectAllUser" resultType="com.zheng.pojo.User">
        select * from mybatis.user
    </select>      

4、傳回類型不對

<select id="selectAllUser" resultType="com.zheng.pojo.User">
        select * from mybatis.user
    </select>      

5、maven導出資源出問題

<!--在build中配置resources，來防止我們資源導出失敗的問題-->
    <build>
        <resources>
            <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>true</filtering>
            </resource>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>true</filtering>
            </resource>
        </resources>
    </build>      

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