mysql语句报错 Data truncation: Truncated incorrect DOUBLE value

mysql 结合mybatis 写update语句用update,set,if标签写了如下一条语句：

<update id="update" parameterType="User">
        UPDATE user
        <set>
            <if test="user_nicheng != null and user_nicheng != ''">
                user_nicheng = #{user_nicheng,jdbcType=VARCHAR} and
            </if>
            <if test="user_phone != null and user_phone != ''">
                user_phone = #{user_phone,jdbcType=VARCHAR} 
            </if>   
        </set>      
        <where>
            <if test="user_name != null and user_name != ''">
                user_name = #{user_name,jdbcType=VARCHAR};
            </if>
        </where>
    </update>

会报错 如下：

Cause: com.mysql.jdbc.MysqlDataTruncation: Data truncation: Truncated incorrect DOUBLE value: 'good'

改成 如下的 sql语句

<update id="update" parameterType="User">
        UPDATE user
        <set>
            <if test="user_nicheng != null and user_nicheng != ''">
                user_nicheng = #{user_nicheng,jdbcType=VARCHAR} ,
            </if>
            <if test="user_phone != null and user_phone != ''">
                user_phone = #{user_phone,jdbcType=VARCHAR} 
            </if>   
        </set>      
        <where>
            <if test="user_name != null and user_name != ''">
                user_name = #{user_name,jdbcType=VARCHAR};
            </if>
        </where>
    </update>

再运行提示更i新成功，原来sql 语句写错了。。。。

正确的写法是：set 标签中的多个if标签拼接，不能用and，应该用 逗号拼接