duifield-sql.c

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/********************************************************************\
 * duifield-sql.c -- Implementation of the SQL Field type           *
 * Copyright (C) 2003 Linas Vepstas <linas@linas.org>               *
 * http://dwi.sourceforge.net                                       *
 *                                                                  *
 * This library is free software; you can redistribute it and/or    *
 * modify it under the terms of the GNU Lesser General Public       *
 * License as published by the Free Software Foundation; either     *
 * version 2.1 of the License, or (at your option) any later version.
 *                                                                  *
 * This library is distributed in the hope that it will be useful,  *
 * but WITHOUT ANY WARRANTY; without even the implied warranty of   *
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the    *
 * GNU Lesser General Public License for more details.              *
 *                                                                  *
 * You should have received a copy of the GNU Lesser General Public *
 * License along with this program; if not, contact:                *
 *                                                                  *
 * Free Software Foundation           Voice:  +1-617-542-5942       *
 * 59 Temple Place - Suite 330        Fax:    +1-617-542-2652       *
 * Boston, MA  02111-1307,  USA       gnu@gnu.org                   *
\********************************************************************/
#include "config.h"

#include <glib.h>
#include <string.h>

#include "dui-initdb.h"
#include "duifield.h"
#include "duifield-sql.h"
#include "duiresolver.h"
#include "perr.h"

/* Data is in a named database field. */
struct sql_field_s
{
    DuiDBRecordSet *recordset;
};

/* Data is compared to a database field. */
struct where_field_s
{
    gchar * compareop;
};

/* =================================================================== */

static void
update_field_clear (DuiField *f)
{
    g_free (f->fieldname);
    f->type = DUI_FIELD_NONE;
}

static void
where_field_clear (DuiField *f)
{
    struct where_field_s * gf = (struct where_field_s *) get_gobj_field (f);
    g_free (f->fieldname);
    g_free (gf->compareop);
    f->type = DUI_FIELD_NONE;
}

/* =================================================================== */

static const gchar *
get_sql_value (DuiField *fs)
{
    const gchar * fieldval = NULL;
    struct sql_field_s * gf = (struct sql_field_s *) get_gobj_field (fs);
    fieldval = dui_recordset_get_value (gf->recordset,
                                        fs->fieldname);
    return fieldval;
}

void
dui_field_set_sql (DuiField *ft, const gchar * fieldname)
{
    struct sql_field_s * gf = (struct sql_field_s *) get_gobj_field (ft);
    ft->type = DUI_FIELD_SQL;
    ft->get_field_value = get_sql_value;
    ft->set_field_value = NULL;
    ft->clear_field = update_field_clear;

    ft->fieldname = g_strdup (fieldname);
    gf->recordset = NULL;
}

void
dui_field_set_where (DuiField *ft, const gchar * fieldname,
                                   const gchar * compareop)
{
    struct where_field_s * gf = (struct where_field_s *) get_gobj_field (ft);
    ft->type = DUI_FIELD_WHERE;
    ft->get_field_value = NULL;
    ft->set_field_value = NULL;
    ft->clear_field = where_field_clear;

    ft->fieldname = g_strdup (fieldname);
    gf->compareop = g_strdup (compareop);
}

const gchar *
dui_field_where_get_op (DuiField *ft)
{
    struct where_field_s * gf;
    if (!ft) return NULL;
    gf = (struct where_field_s *) get_gobj_field (ft);
    /* ft->type is a const char, as is DUI_FIELD_WHERE */
    if (0 != g_ascii_strncasecmp(DUI_FIELD_WHERE, ft->type, 0)) return NULL;
    return gf->compareop;
}

/* =================================================================== */

void
dui_field_resolve_recordset (DuiField *fs, DuiDBRecordSet *rset)
{
    struct sql_field_s * gf = (struct sql_field_s *) get_gobj_field (fs);
    if (!DUI_FIELD_IS_TYPE(fs,DUI_FIELD_SQL)) return;
    gf->recordset = rset;
}

/* ========================== END OF FILE ============================ */

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