Ns_PdDbGetRow

Overview

Send to client a row associated with the column count.

Syntax

    void Ns_PdDbGetRow(void *handle, char *columnCount);

Description

This function should retrieve from the DBMS the row associated with the columnCount column and send this data to the client. For example:

    if (status == DB_END_DATA) {
    	Ns_PdSendData(END_DATA, strlen(END_DATA));
    } else {
    	Ns_PdSendRowInfo(rowInfo);
    }

If the get-row operation was successful, this function should call Ns_PdSendString with an OK_STATUS and then send the data with Ns_PdDbSendData. On failure, the function should use Ns_PdSendString to return an error.

Psuedo-code Example

    /* Things italicized would be your DBMS-specific structures and 
calls. */
    void
    Ns_PdDbGetRow(void *handle, char *columnCount) {
        DBMSState  *state = (DBMSState *) handle;
        Ns_PdRowInfo      *rowInfo;
        int                ncols;
        Ns_PdLog(Trace, "getrow(%s):", columnCount);
        ncols = atoi(columnCount);
        if ((rowInfo = Ns_PdNewRowInfo(ncols)) == NULL) {
            char            errbuf[ERRBUF_SIZE];
            sprintf(errbuf,
                "DBMS proxy daemon could not allocate memory for 
row(%d)", ncols);
            Ns_PdSendString(errbuf);
        } else {
            int             status;
            Ns_PdSetRowInfoNumColumns(rowInfo, ncols);
            if ((status = DBMSGetRow(state, rowInfo)) == NS_ERROR) {
                Ns_PdSendException(state->exceptionCode, 
    state->exceptionMsg);
            } else {
                Ns_PdSendString(OK_STATUS);
                if (status == DB_END_DATA) {
                    Ns_PdSendData(END_DATA, strlen(END_DATA));
                } else {
                    Ns_PdSendRowInfo(rowInfo);
                }
            }
            Ns_PdFreeRowInfo(rowInfo, 0);
        }
    }

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