02 2021 档案

curl post bin文件
摘要：curl \ -H 'Accept-Encoding:gzip' \ -X POST \ --data-binary @/var/req_raw_eeeeeeeeeeeeeeee.eeeeeeee \ "https://aaa.bb.com/api/ccc/dddd?app=aaaaaaa&uuid 阅读全文
posted @ 2021-02-26 17:00 chenzechao 阅读(119) 评论(0) 推荐(0) 编辑
数据库对字符串中空格敏感情况
摘要：select * from ( select '1 ' as table_name,count(1) as cnt union all select '2 ' as table_name,count(1) as cnt union all select '3 ' as table_name,coun 阅读全文
posted @ 2021-02-24 10:58 chenzechao 阅读(111) 评论(0) 推荐(0) 编辑
mysql执行计划中的key_len计算
摘要：key_len的长度计算公式： varchr(10)变长字段且允许NULL : 10*(Character Set：utf8=3,gbk=2,latin1=1)+1(NULL)+2(变长字段) varchr(10)变长字段且不允许NULL : 10*(Character Set：utf8=3,gbk 阅读全文
posted @ 2021-02-02 17:30 chenzechao 阅读(103) 评论(0) 推荐(0) 编辑

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