mysql - 如何在mongodb和mysql中搜索搜索到的子字符串中的某个字符串？

Question

我的数据库中的“用户”集合/表数据如下所示:-

{
 _id: 1,
 name: "Vikas",
 subject: "Computers"
},
{
 _id: 2,
 name: "Hello",
 subject: "Computers"
},
{
 _id: 3,
 name: "Abc",
 subject: "Mechanical"
}

以下查询将给出机械数据的结果:-

Mongodb:-

db.test.find({subject:/mech/i}) ->

Mysql:-

select * from test where subject like "%mech%"

但是我想要这样的搜索，如果我搜索“mechanicalData”，那么这不会给出机械数据的结果。

我希望我能够解答我的问题。 提前致谢!

Answer 1

For MongoDB    
db.test.find({subject: /^mech$/i}) //Search exact word
db.test.find({subject: /mech$/i}) //Search word which ending with "mech"
db.test.find({subject: /^mech/i}) //Search word which start with "mech"
db.test.find({subject: /mech/i}) //Search word at any position


For Mysql
select * from test where subject like "mech" //Search exact word
select * from test where subject like "%mech" //Search word which ending with "metch"
select * from test where subject like "mech%" //Search word which start with "metch"
select * from test where subject like "%mech%" //Search word at any position