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From: SRIRAMK@charlie.usd.edu
Date: Fri, 20 May 1994 21:15:03 -0500 (CDT)
To: postgres@postgres.Berkeley.EDU
CC: SRIRAMK@charlie.usd.edu
Message-Id: <940520211503.91c@charlie.usd.edu>
Subject: Retrieving tuples based on match cond in C variable
Resent-To: postgres-redist@postgres.Berkeley.EDU
Resent-Date: Fri, 20 May 94 19:10:35 -0700
Resent-XMts: smtp

I need to retrieve tuples based on search  where the search criteria
to be matched with is contained in a variable.

Essentially I have a class called Body with two attributes - 
msgid of type int4 and line of type text.

I need to retrieve all lines corresponding to a msgid where the msgid
is accepted from the user into a C variable called msgnum.

The function retbody given below is for retrieving tuples whose msgid
attribute matches the variable msgnum 


retbody(msgnum)
int msgnum;   
{
    PortalBuffer *p;
    
    PQsetdb ("maildbtrial1");
    PQexec ("begin");
    PQexec ("retrieve portal g (BODY.line) where BODY.msgid = msgnum "); 

The last line in the above code is incorrect. Please let me know how to 
handle this.

I will similarly require to retrieve  tuples based on substring match
where the condition to be matched is kept in a variable. 

Please let me have the  correct approach for both the above situations.

Thanks

Sriram Kal

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