Can you please tell us how set this prefetch attribute in following lines.

Hi all,

How to fetch certain number of tuples from a postgres table.

Same I am doing in oracle using following lines by setting prefetch attribute.

For oracle
// Prepare query
if( OCIStmtPrepare( myOciStatement, myOciError, (text *)aSqlStatement,
// Get statement type
OCIAttrGet( (void *)myOciStatement, OCI_HTYPE_STMT, &statement_type, 0, OCI_ATTR_STMT_TYPE, myOciError );
// Set prefetch count
OCIAttrSet( myOciStatement, OCI_HTYPE_STMT, &prefetch, 0, OCI_ATTR_PREFETCH_ROWS, myOciError );
// Execute query
status = OCIStmtExecute( myOciServerCtx, myOciStatement, myOciError, iters, 0, NULL, NULL, OCI_DEFAULT );

For Postgres

Can you please tell us how set this prefetch attribute in following lines. Is PQexec returns all the rows from the table?

mySqlResultsPG = PQexec(connection, aSqlStatement);
if((PQresultStatus(mySqlResultsPG) == PGRES_FATAL_ERROR ) || (PQstatus(connection) != CONNECTION_OK)){}
if ((PQresultStatus(mySqlResultsPG) == PGRES_COMMAND_OK) || (PQresultStatus(mySqlResultsPG) == PGRES_TUPLES_OK))
{
myNumColumns = PQnfields(mySqlResultsPG);
myTotalNumberOfRowsInQueryResult = PQntuples(mySqlResultsPG);
myCurrentRowNum = 0 ;
}

Regards

Tarkeshwar