How to use WHERE attribute of FINDER tag in service.xml?

[Kravchenko Dmitry，修改在12 年前。]

How to use WHERE attribute of FINDER tag in service.xml?

For example, is it possible to create finder, which receives single parameter P : String and looks for all rows where columns A and B satisfy A=P OR B=P?

In this example I need a finder column to have a name, which differs from any column name in a table. Is it possible?

Is it possible to use wilcard matching in finders, for example, how to find all rows which N field starts from "guest"?

Thanks

[Ravi Kumar Gupta，修改在12 年前。]

I guess its already there.. Like see this

<finder name="G_F_N" return-type="DLFileEntry" unique="true">
			<finder-column name="groupId" />
			<finder-column name="folderId" />
			<finder-column name="name" />
		</finder>

This is supposed to be a finder method with 3 arguments long, long, string.. and below is something that you are referring to(as it seems to me)

<finder name="A_B" return-type="collection">
			<finder-column name="A" />
			<finder-column name="B" />
		</finder>

provided both A and B are type string.. In the implementation according to what you want.. P will be passed as both A and B.. or say whenever you are going to call this finder method call like this..

xxx.findByA_B(P,P);

I am still learning services but I hope this is the way it works.. if not, correct me please..
-Ravi

[Kravchenko Dmitry，修改在12 年前。]

But where are you using WHERE attribute? I was interesting namely in it.

[Amos Fong，修改在12 年前。]

Hi,

Do you mean the where attribute in <finder> as defined in the dtd?

<!--ATTLIST finder
	name CDATA #REQUIRED
	return-type CDATA #REQUIRED
	unique CDATA #IMPLIED
	where CDATA #IMPLIED
	db-index CDATA #IMPLIED
-->

Here is an example from the source code:

		<finder name="L_L_P" return-type="Collection" where="status != 5">
			<finder-column name="layoutSetBranchId" />
			<finder-column name="layoutBranchId" />
			<finder-column name="plid" />
		</finder>

As for wildcards in it, I'm not sure, try a like with %'s

[Kravchenko Dmitry，修改在12 年前。]

So, according to your example, I can't use WHERE to control filtering by finder parameters? It is just an additional filtering which can't refer finder columns?

For example,

        <finder name="People" return-type="Collection" where="age <= askedage">
            <finder-column name="askedage" />
        </finder>

with no 'askedage' column in the table.

[Nagendra Kumar Busam，修改在12 年前。]

I am not sure about WHERE clause, if you want to do wild card you can do it as below

Suppose if you want search for firstNames starting with Brain pass "Brain%" OR if you want firstNames ending with Brain pass "%Brain"

        <finder name="ByFirstName" return-type="Collection">
            <finder-column name="firstName" [b]comparator="LIKE" [ b] />
        </finder>

HTH

[kartik shiroya，修改在8 年前。]

Nagendra Kumar Busam:

I am not sure about WHERE clause, if you want to do wild card you can do it as below

Suppose if you want search for firstNames starting with Brain pass "Brain%" OR if you want firstNames ending with Brain pass "%Brain"

        <finder name="ByFirstName" return-type="Collection">
            <finder-column name="firstName" [b]comparator="LIKE" [ b] />
        </finder>

HTH

Hello Nagendra

If i m putting comparator="LIKE" parameter in finder column then it will search like
Select * from user_ where firstName like "test";

But i am looking for LIKE operator as like below
Select * from user_ where firstName like "%test%";

so how should i have to implement it.

Note: i am not getting for 'b' with square bracket in your comment, please elaborate it.

Regards
Kartik

[David H Nebinger，修改在8 年前。]

kartik shiroya:

But i am looking for LIKE operator as like below
Select * from user_ where firstName like "%test%";

Just surround the value with what you are passing to the finder with the percent signs.

Note: i am not getting for 'b' with square bracket in your comment, please elaborate it.

Formatting tags such as bold are not enforced within code blocks.