Mybatis批量更新

刚接触mybaties  需要执行批量更新。

具体需求是，前端给我一个list,将list中的内容根据id在数据库中跟新数据。

要更新的list实体类为：

public class SysParamEntity {

    private int id;

    private String pcode;

    private String label;

    private String pvalue;

    private String remark;

    private String creater;

    private Date createdDate;

    private String modifier;

    private Date modifiedDate;
}

 要根据id批量跟新pvalue，modifier，modifiedDate，mapper.xml文件如下

    <update id="batchUpdate">
        update direct_bank_sys_param
        <trim prefix="set" suffixOverrides=",">
            <trim prefix="pvalue =case" suffix="end,">
                <foreach collection="list" item="i" index="index">
                    <if test="i.pvalue!=null">
                        when id=#{i.id} then #{i.pvalue}
                    </if>
                </foreach>
            </trim>
            <trim prefix=" modified_date =case"  suffix="end,">
                <foreach collection="list" item="i"  index="index">
                    <if test="i.modifiedDate!=null">
                        when id=#{i.id} then #{i.modifiedDate}
                    </if>
                </foreach>
            </trim>
            <trim prefix=" modifier =case"  suffix="end,">
                <foreach collection="list" item="i"  index="index">
                    <if test="i.modifier!=null">
                        when id=#{i.id} then #{i.modifier}
                    </if>
                </foreach>
            </trim>
        </trim>
        where
        <foreach collection="list" separator="or" item="i" index="index">
            id=#{i.id}
        </foreach>
    </update>