srv_orderby

Return an order-by list to a client.

CS_RETCODE srv_orderby(spp, numcols, collistp)

SRV_PROC    *spp;
CS_INT           numcols;
CS_INT          *collistp;

numcols: The number of columns in the order-by list. Because the columns are passed as an array of CS_INTs, numcols is really the number of elements in the collistp array.

collistp: A pointer to the array of column numbers. The size of this array is numcols.

**Table 3-77: Return values (srv_orderby)**
Returns	To indicate
CS_SUCCEED	The routine completed successfully.
CS_FAIL	The routine failed.

#include  <ospublic.h>

/*

** Local Prototype

*/

CS_RETCODE   ex_srv_orderby PROTOTYPE((

SRV_PROC     *spp

));

/*

** EX_SRV_ORDERBY

**

**    Example routine using srv_orderby to define and return to a

 **    client application the order-by list for a simple SQL

 **    command.

**    This example uses the SQL command:

**

**        “select a,b,c,d from my_tab

 **         order by c,a”

**

** Arguments:

**    spp    A pointer to the internal thread control structure.

**

** Returns:

**    CS_SUCCEED      Order-by list was successfully defined.

**    CS_FAIL         An error was detected..

*/

CS_RETCODE            ex_srv_orderby(spp)

SRV_PROC              *spp;

    /* There are two columns specified in the order-by clause. */

    CS_INT        collist[2];

    CS_INT        numcols;

    /* Initialization. */

    numcols = 2;

/*

    ** Initialize the collist array in the order the

     ** columns occur in the order-by clause.

**

    ** “c” is the 1st column specified in the order-by,

     ** and is the 3rd column specified in the select-list.

*/

    collist[0] = (CS_INT)3;

/*

    ** “a” is the 2nd column specified in the order-by,

     ** and is the 1st column specified in the select-list.

*/

    collist[1] = (CS_INT)1;

/*

    ** Define the order-by list.

*/

    if (srv_orderby(spp, numcols, collist) != CS_SUCCEED)

        return(CS_FAIL);

    return(CS_SUCCEED);

srv_orderby is necessary only if you want to mimic Adaptive Server’s feature of returning order-by information.
srv_orderby allows an Open Server application to return information about sort order to a client. In the SQL command:
```
select a, b, c, d
```
```
 order by c, a
```
The sort order is column c followed by column a. The application returns this information to the client by listing column 3 followed by column 1 in the column number array.
The first column in a select list is column 1.
srv_orderby must be called after a call to srv_desc&fmt and before a call to srv_bind.