Hi All,
 
I have a question regarding multiple inserts.
The following function inserts for each country found in country table, values into merchant_buyer_country.
 
----------------------------------------------------------------------------------------------------------------------------------------
        CSQLStatement st( sql );
        CSQLStatement st1( sql );
        SQLINTEGER rows;
        long num_codes = 0;
        rows = st.Select( "SELECT * FROM merchant_buyer_country where merchant_id = %lu ",merchant_id );
        if  ( rows )
                return 0;
    char code[4];
        rows = st.Select( "SELECT code FROM country WHERE send IS NOT NULL OR receive IS NOT NULL" );
    SQLBindCol( st.hstmt, 1, SQL_C_CHAR, code, sizeof(code), 0 );
   long i;
   for (i = 0; i < rows; i++ )
   {
          st.Fetch();
          st1.Command("INSERT INTO merchant_buyer_country (merchant_id,country,enabled,group_id)  VALUES(%lu ,'%s', true, %lu )", merchant_id,
 code,group_id);
   }
        st.CloseCursor();
    st1.CloseCursor();
        return 1;
----------------------------------------------------------------------------------------------------------------------------------------
On looking at the log file, I saw separate inserts being performed, and each insert takes about 1 second.
 
insert into merchant_buyer_country (merchant_id,country,enabled,group_id) values(1203,'IN','true',1);
insert into merchant_buyer_country merchant_id,country,enabled,group_id)  values(1203,'US','true',1);
insert into merchant_buyer_country merchant_id,country,enabled,group_id) values (1203,'AR','true',1);
insert into merchant_buyer_country (merchant_id,country,enabled,group_id) values(1203,'AZ','true',1);
insert into merchant_buyer_country merchant_id,country,enabled,group_id) values (1203,'BG','true',1);
insert into merchant_buyer_country merchant_id,country,enabled,group_id) values(1203,'SP','true',1);
.....
 
There are more than 100 countries and this takes a lot of time for the inserts to complete.
Is there a way to write the INSERT as follows?
 
INSERT into merchant_buyer_country (merchant_id,country,enabled,group_id)  values (1203,
(SELECT code FROM country WHERE send IS NOT NULL OR receive IS NOT NULL), 'true',1);
 
I tried this, but I get the following problem:
ERROR:  More than one tuple returned by a subselect used as an _expression_.
 
I know there is a way to this, but I am not sure where I am going wrong. Can someone please help me figure this out.
 
Thanks,
Saranya
 


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