IUserDao.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.itheima.dao.IUserDao">

    <!-- 配置 查詢結果的列名和實體類的屬性名的對應關係 -->
    <resultMap id="userMap" type="uSeR">
        <!-- 主鍵欄位的對應 -->
        <id property="userId" column="id"></id>
        <!--非主鍵欄位的對應-->
        <result property="userName" column="username"></result>
        <result property="userAddress" column="address"></result>
        <result property="userSex" column="sex"></result>
        <result property="userBirthday" column="birthday"></result>
    </resultMap>

    <!-- 瞭解的內容：抽取重複的sql語句-->
    <sql id="defaultUser">
        select * from user
    </sql>

    <!-- 查詢所有 -->
    <select id="findAll" resultMap="userMap">
        <include refid="defaultUser"></include>
    </select>

    <!-- 根據id查詢使用者 -->
    <select id="findById" parameterType="INT" resultMap="userMap">
        select * from user where id = #{uid}
    </select>

    <!-- 根據名稱模糊查詢 -->
    <select id="findByName" parameterType="string" resultMap="userMap">
          select * from user where username like #{name}
   </select>

    <!-- 根據queryVo的條件查詢使用者 -->
    <select id="findUserByVo" parameterType="com.itheima.domain.QueryVo" resultMap="userMap">
        select * from user where username like #{user.userName}
    </select>

    <!-- 根據條件查詢
    <select id="findUserByCondition" resultMap="userMap" parameterType="user">
        select * from user where 1=1
        <if test="userName != null">
          and username = #{userName}
        </if>
        <if test="userSex != null">
            and sex = #{userSex}
        </if>
    </select>-->

    <select id="findUserByCondition" resultMap="userMap" parameterType="user">
        select * from user
        <where>
            <if test="userName != null">
                and username = #{userName}
            </if>
            <if test="userSex != null">
                and sex = #{userSex}
            </if>
        </where>
    </select>

    <!-- 根據queryvo中的Id集合實現查詢使用者列表 -->
    <select id="findUserInIds" resultMap="userMap" parameterType="queryvo">
        <include refid="defaultUser"></include>
        <where>
            <if test="ids != null and ids.size()>0">
                <foreach collection="ids" open="and id in (" close=")" item="uid" separator=",">
                    #{uid}
                </foreach>
            </if>
        </where>
    </select>
</mapper>

-----------------

sqlmapconfig.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <!-- 配置properties-->
    <properties resource="jdbcConfig.properties"></properties>

    <!--使用typeAliases配置別名，它只能配置domain中類的別名 -->
    <typeAliases>
        <package name="com.itheima.domain"></package>
    </typeAliases>

    <!--配置環境-->
    <environments default="mysql">
        <!-- 配置mysql的環境-->
        <environment id="mysql">
            <!-- 配置事務 -->
            <transactionManager type="JDBC"></transactionManager>

            <!--配置連線池-->
            <dataSource type="POOLED">
                <property name="driver" value="${jdbc.driver}"></property>
                <property name="url" value="${jdbc.url}"></property>
                <property name="username" value="${jdbc.username}"></property>
                <property name="password" value="${jdbc.password}"></property>
            </dataSource>
        </environment>
    </environments>
    <!-- 配置對映檔案的位置 -->
    <mappers>
        <package name="com.itheima.dao"></package>
    </mappers>
</configuration>