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>
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会报错 如下:
Cause: com.mysql.jdbc.MysqlDataTruncation: Data truncation: Truncated incorrect DOUBLE value: 'good'
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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>
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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
转载自: https://blog.youkuaiyun.com/wjj1996825/article/details/80044786