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pgSql

語(yǔ)法 to_number(text, text)

例子 select to_number(trim(both 'ibs' from classname), '999999') as cn from bbs order by cn   /*trim(both 'ibs' from classname)去除classname字段中的'ibs'字符*/

mySql

語(yǔ)法 str*1 / str+1 / -str  /*str為varchar的數(shù)字，此處不一定是1，只要是數(shù)字即可*/

hql

語(yǔ)法 to_number(text, text)

例子 select b from BBS b where b.isDeleted=false order by to_number(trim(both 'ibs' from b.className), '999999')

pgSql數(shù)據(jù)類(lèi)型格式化函數(shù)