myssql数据库表名转驼峰

 

1.数据库的表名，字段命名一般用下划线分隔，在编程时一般使用的是驼峰命名

2.myssql没有INITCAP函数，以下写法支持四个下划线，可以自己扩展

 

说明：YOU_TABLE_NAME 替换为需要转驼峰的表名

    YOU_TABLE_SCHEMA 替换为TABLE_SCHEMA

-- 变量赋值
select @tbl := 'YOU_TABLE_NAME',@scha := 'YOU_TABLE_SCHEMA';
-- 表名转驼峰且首字母大写
select CONCAT(
-- _分割之后的第一段
UPPER(substr(SUBSTRING_INDEX(LOWER(t.TABLE_NAME),'_',1),1,1)),
substr(SUBSTRING_INDEX(LOWER(t.TABLE_NAME),'_',1),2),
-- _分割之后的第二段
substr(UPPER(t.TABLE_NAME),length(SUBSTRING_INDEX(t.TABLE_NAME,'_',1)) + 2,1),
substr(LOWER(t.TABLE_NAME),length(SUBSTRING_INDEX(t.TABLE_NAME,'_',1)) + 3,length(SUBSTRING_INDEX(t.TABLE_NAME,'_',2)) - length(SUBSTRING_INDEX(t.TABLE_NAME,'_',1))-2),
-- _分割之后的第三段
substr(UPPER(t.TABLE_NAME),length(SUBSTRING_INDEX(t.TABLE_NAME,'_',2)) + 2,1),
substr(LOWER(t.TABLE_NAME),length(SUBSTRING_INDEX(t.TABLE_NAME,'_',2)) + 3,length(SUBSTRING_INDEX(t.TABLE_NAME,'_',3)) - length(SUBSTRING_INDEX(t.TABLE_NAME,'_',2))-2),
-- _分割之后的第四段
substr(UPPER(t.TABLE_NAME),length(SUBSTRING_INDEX(t.TABLE_NAME,'_',3)) + 2,1),
substr(LOWER(t.TABLE_NAME),length(SUBSTRING_INDEX(t.TABLE_NAME,'_',3)) + 3,length(SUBSTRING_INDEX(t.TABLE_NAME,'_',4)) - length(SUBSTRING_INDEX(t.TABLE_NAME,'_',3))-2),
-- _分割之后的第五段
substr(UPPER(t.TABLE_NAME),length(SUBSTRING_INDEX(t.TABLE_NAME,'_',4)) + 2,1),
substr(LOWER(t.TABLE_NAME),length(SUBSTRING_INDEX(t.TABLE_NAME,'_',4)) + 3,length(SUBSTRING_INDEX(t.TABLE_NAME,'_',5)) - length(SUBSTRING_INDEX(t.TABLE_NAME,'_',4))-2)
)
from information_schema.`TABLES` t where t.TABLE_SCHEMA = @scha and t.TABLE_NAME = @tbl;


-- 表名转驼峰且首字母小写
select CONCAT(
-- _分割之后的第一段
SUBSTRING_INDEX(LOWER(t.TABLE_NAME),'_',1),
-- _分割之后的第二段
substr(UPPER(t.TABLE_NAME),length(SUBSTRING_INDEX(t.TABLE_NAME,'_',1)) + 2,1),
substr(LOWER(t.TABLE_NAME),length(SUBSTRING_INDEX(t.TABLE_NAME,'_',1)) + 3,length(SUBSTRING_INDEX(t.TABLE_NAME,'_',2)) - length(SUBSTRING_INDEX(t.TABLE_NAME,'_',1))-2),
-- _分割之后的第三段
substr(UPPER(t.TABLE_NAME),length(SUBSTRING_INDEX(t.TABLE_NAME,'_',2)) + 2,1),
substr(LOWER(t.TABLE_NAME),length(SUBSTRING_INDEX(t.TABLE_NAME,'_',2)) + 3,length(SUBSTRING_INDEX(t.TABLE_NAME,'_',3)) - length(SUBSTRING_INDEX(t.TABLE_NAME,'_',2))-2),
-- _分割之后的第四段
substr(UPPER(t.TABLE_NAME),length(SUBSTRING_INDEX(t.TABLE_NAME,'_',3)) + 2,1),
substr(LOWER(t.TABLE_NAME),length(SUBSTRING_INDEX(t.TABLE_NAME,'_',3)) + 3,length(SUBSTRING_INDEX(t.TABLE_NAME,'_',4)) - length(SUBSTRING_INDEX(t.TABLE_NAME,'_',3))-2),
-- _分割之后的第五段
substr(UPPER(t.TABLE_NAME),length(SUBSTRING_INDEX(t.TABLE_NAME,'_',4)) + 2,1),
substr(LOWER(t.TABLE_NAME),length(SUBSTRING_INDEX(t.TABLE_NAME,'_',4)) + 3,length(SUBSTRING_INDEX(t.TABLE_NAME,'_',5)) - length(SUBSTRING_INDEX(t.TABLE_NAME,'_',4))-2)
)
from information_schema.`TABLES` t where t.TABLE_SCHEMA = @scha and t.TABLE_NAME = @tbl;