常用SQL语句写法（一）

<resultMap id="userResult" type="com.cloudwalk.shark.model.User">
    <id property="id" column="ID" jdbcType="INTEGER"></id>
    <result property="userName" column="user_name" jdbcType="VARCHAR"></result>
</resultMap>

<insert id="insertUser" parameterType="com.cloudwalk.shark.model.User">
    INSERT INTO
      t_shark_user(ID,USER_NAME)
    VALUES
    (
      #{id},#{userName}
    )
</insert>

<select id="findUserByName" parameterType="java.lang.String" resultMap="userResult">
    select id,user_name as userName from t_shark_user
    where  1=1
    <if test=" _parameter !=null and _parameter  !='' " >
        and user_name = #{name,jdbcType=VARCHAR}
    </if>
</select>

<select id="queryUserByName" parameterType="java.util.ArrayList" resultMap="userResult">
    select id,user_name as userName from t_shark_user
    where  user_name in
    <if test=" list !=null and list.size>0  !='' " >
        <foreach collection="list" item="userName" index="index" open="(" close=")" separator=",">
            #{userName}
        </foreach>
    </if>
</select>