How to search record using multidata search in c#

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How to search record using multidata search

I have three data to search a record
Class
Section
Stream

For Exampale

"Select * from tb_StudentInfo where Class="Value" and Section="Value" and Stream="Value"";
this query return correct value

But if One value missing

"Select * from tb_StudentInfo where Class="Value" and Section="null" and Stream="null"";

query return nothing

How to solve this problem???

Posted 13-May-14 0:16am

Manamohan Jha

Updated 13-May-14 0:18am

sankarsan parida

v2

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sankarsan parida · Answer 1 · 2014-05-13T00:22:00

Solution 1

put the query like and check null column with is null

"Select * from tb_StudentInfo where Class="Value" and Section is null  and Stream is null ";

Posted 13-May-14 0:22am

sankarsan parida

Comments

Manamohan Jha 13-May-14 6:29am

how to set "is null" on runtime???

Manamohan Jha 13-May-14 6:30am

Query not working with Access Databse???

[no name] 13-May-14 6:35am

Write a store procedure check with null condition
if(@Section is null and @Stream is null)
{ "Select * from tb_StudentInfo where Class="Value" and Section is null and Stream is null "; }

agent_kruger · Answer 2 · 2014-05-13T00:28:00

sir, try making your query a little dynamic

For eg. for access try this code

"Select * from tb_StudentInfo 
where Class=' & Value & '
 iif(IsNull('Your value')=false,' and Section=' & value,'') & 
 and iif(IsNull('Your value')=false,' and Stream=' & value,'')";

in the above example it will search if the value is null the query becomes this

"Select * from tb_StudentInfo where Class="Value"";

Brahmmam · Answer 3 · 2014-05-13T00:35:00

For ur requirement you may need to build dynamic query

C#

string query="Select * from tb_StudentInfo ";

if(Class!=null&&Section!=null&&Stream!=null)
{
query=query+"where Class="Value" and Section="Value" and Stream="Value"";
}
else if(Section==null&&Stream==null)
{
query=query+"where  Class="Value"";
}
else if(Class==null&&Stream==null)
{
query=query+"where Section="Value"";
}
else if(Class==null&&Section==null)
{
query=query+"where Stream="Value"";
}
else if(Class==null)
{
query=query+"where Section="Value" and Stream="Value"";
}
else if(Section==null)
{
query=query+"where Class="Value" and Stream="Value"";
}
else if(Stream==null)
{
query=query+"where Section="Value" and Class="Value"";
}

Now you can use query variable

How to search record using multidata search in c#

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