mysql> update `table_name` set field = replace(field,'.rar','.7z');
table_name:要查询的表名,
field:表里的字段名,
replace(field,'.rar','.7z'); :正则匹配,把field字段里的 .rar 替换为 .7z
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mysql> update `table_name` set field = replace(field,'.rar','.7z');