89 lines
2.6 KiB
C
89 lines
2.6 KiB
C
#ifndef _RESULTSET_H
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#define _RESULTSET_H
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/*
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* This file is distributed as part of the MariaDB Corporation MaxScale. It is free
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* software: you can redistribute it and/or modify it under the terms of the
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* GNU General Public License as published by the Free Software Foundation,
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* version 2.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 51
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* Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Copyright MariaDB Corporation Ab 2013-2014
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*/
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/**
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* @file resultset.h The MaxScale generic result set mechanism
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*
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* @verbatim
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* Revision History
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*
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* Date Who Description
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* 17/02/15 Mark Riddoch Initial implementation
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*
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* @endverbatim
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*/
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#include <dcb.h>
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/**
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* Column types
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*/
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typedef enum {
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COL_TYPE_VARCHAR = 0x0f,
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COL_TYPE_VARSTRING = 0xfd
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} RESULT_COL_TYPE;
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/**
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* The result set column definition. Each result set has an order linked
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* list of column definitions.
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*/
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typedef struct resultcolumn {
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char *name; /*< Column name */
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int len; /*< Column length */
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RESULT_COL_TYPE type; /*< Column type */
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struct resultcolumn *next; /*< next column */
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} RESULT_COLUMN;
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/**
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* A representation of a row within a result set.
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*/
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typedef struct resultrow {
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int n_cols; /*< No. of columns in row */
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char **cols; /*< The columns themselves */
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} RESULT_ROW;
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struct resultset;
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/**
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* Type of callback function used to supply each row
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*/
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typedef RESULT_ROW * (*RESULT_ROW_CB)(struct resultset *, void *);
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/**
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* The representation of the result set itself.
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*/
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typedef struct resultset {
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int n_cols; /*< No. of columns */
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RESULT_COLUMN *column; /*< Linked list of column definitions */
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RESULT_ROW_CB fetchrow; /*< Fetch a row for the result set */
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void *userdata; /*< User data for the fetch row call */
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} RESULTSET;
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extern RESULTSET *resultset_create(RESULT_ROW_CB, void *);
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extern void resultset_free(RESULTSET *);
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extern int resultset_add_column(RESULTSET *, char *, int, RESULT_COL_TYPE);
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extern void resultset_column_free(RESULT_COLUMN *);
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extern RESULT_ROW *resultset_make_row(RESULTSET *);
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extern void resultset_free_row(RESULT_ROW *);
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extern int resultset_row_set(RESULT_ROW *, int, char *);
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extern void resultset_stream_mysql(RESULTSET *, DCB *);
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extern void resultset_stream_json(RESULTSET *, DCB *);
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#endif
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