From: Andrea Zagli <a.zagli@comune.scandicci.fi.it>
Date: Fri, 15 Nov 2013 08:22:06 +0000 (+0100)
Subject: Added function GdaEx::get_new_id (closes #691).
X-Git-Tag: 0.4.0~8
X-Git-Url: https://saetta.ns0.it/gitweb?a=commitdiff_plain;h=0862c222c301e8e6acc8f788e7856765572e7bf8;p=libgdaex

Added function GdaEx::get_new_id (closes #691).
---

diff --git a/src/gdaex.c b/src/gdaex.c
index 60d5a1e..39e633a 100644
--- a/src/gdaex.c
+++ b/src/gdaex.c
@@ -1,7 +1,7 @@
 /*
  *  gdaex.c
  *
- *  Copyright (C) 2005-2011 Andrea Zagli <azagli@libero.it>
+ *  Copyright (C) 2005-2013 Andrea Zagli <azagli@libero.it>
  *
  *  This file is part of libgdaex.
  *  
@@ -3224,6 +3224,39 @@ const gchar
 	return ret;
 }
 
+guint
+gdaex_get_new_id (GdaEx *gdaex,
+                  const gchar *table_name,
+                  const gchar *id_field_name,
+                  const gchar *where)
+{
+	guint ret;
+
+	gchar *sql;
+	GdaDataModel *dm;
+
+	g_return_val_if_fail (IS_GDAEX (gdaex), 0);
+
+	ret = 1;
+	sql = g_strdup_printf ("SELECT COALESCE (MAX (%s), 0) + 1 FROM %s%s%s",
+	                       id_field_name,
+	                       table_name,
+	                       where != NULL ? " WHERE " : "",
+	                       where != NULL ? where : "");
+	dm = gdaex_query (gdaex, sql);
+	g_free (sql);
+	if (dm != NULL && gda_data_model_get_n_rows (dm) > 0)
+		{
+			ret = gdaex_data_model_get_value_integer_at (dm, 0, 0);
+		}
+	if (dm != NULL)
+		{
+			g_object_unref (dm);
+		}
+
+	return ret;
+}
+
 gchar
 *gdaex_format_money (gdouble number,
                      gint decimals,
diff --git a/src/gdaex.h b/src/gdaex.h
index 8cae732..fd5d420 100644
--- a/src/gdaex.h
+++ b/src/gdaex.h
@@ -1,7 +1,7 @@
 /*
  *  gdaex.h
  *
- *  Copyright (C) 2005-2011 Andrea Zagli <azagli@libero.it>
+ *  Copyright (C) 2005-2013 Andrea Zagli <azagli@libero.it>
  *
  *  This file is part of libgdaex.
  *  
@@ -242,6 +242,11 @@ const gchar *gdaex_get_sql_from_hashtable (GdaEx *gdaex,
                                            GHashTable *keys,
                                            GHashTable *fields);
 
+guint gdaex_get_new_id (GdaEx *gdaex,
+                        const gchar *table_name,
+                        const gchar *id_field_name,
+                        const gchar *where);
+
 gchar *gdaex_format_money (gdouble number,
                      gint decimals,
                      gboolean with_currency_symbol);