Initial (untested) shot at a lua<->QSql wrapper.

1 files changed, 176 insertions, 0 deletions

diff --git a/client/luadb.cc b/client/luadb.cc
new file mode 100644
index 0000000..8666f98
--- /dev/null
+++ b/client/luadb.cc
@@ -0,0 +1,176 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set et sw=2 ts=2: */
+/***************************************************************************
+ *            luadb.cc
+ *
+ *  Sat Aug 28 13:40:58 CEST 2010
+ *  Copyright 2010 Bent Bisballe Nyeng
+ *  deva@aasimon.org
+ ****************************************************************************/
+
+/*
+ *  This file is part of Pracro.
+ *
+ *  Pracro is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  Pracro 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 General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with Pracro; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
+ */
+#include "luadb.h"
+
+#include <QSqlDatabase>
+#include <QSqlQuery>
+
+#include <lauxlib.h>
+
+#include "debug.h"
+
+#define luaL_checkbool(L, i) \
+  (lua_isboolean(L,i) ? lua_toboolean(L,i) : luaL_checkint(L,i))
+
+class DB {
+public:
+  DB(QString driver, QString server, QString database,
+     QString user, QString password = "", int port = -1) {
+    db = QSqlDatabase::addDatabase(driver);
+    db.setHostName(server);
+    if(port != -1) db.setPort(port);
+    db.setDatabaseName(database);
+    db.setUserName(user);
+    if(password != "") db.setPassword(password);
+    db.setConnectOptions("connect_timeout=2000");
+  }
+
+  ~DB() { }
+  
+  void exec(const QString &querystr) {
+    query = db.exec(querystr);
+  }
+
+  bool next()
+  {
+    return query.next();
+  }
+
+  QString value(int idx) {
+    return query.value(idx).toString();
+  }
+
+private:
+  QSqlDatabase db;
+  QSqlQuery query;
+};
+
+typedef struct db_userdata {
+  DB *db;
+} db_userdata;
+
+static int db_value(lua_State *L)
+{
+  db_userdata *dbu;
+
+  dbu = (db_userdata *)luaL_checkudata(L, 1, "DB");
+  luaL_argcheck(L, dbu, 1, "DB expected");
+
+  int idx = luaL_checkinteger(L, 2);
+
+  lua_pushstring(L, dbu->db->value(idx).toStdString().c_str());
+
+  return 1;
+}
+
+static int db_exec(lua_State *L)
+{
+  db_userdata *dbu;
+
+  dbu = (db_userdata *)luaL_checkudata(L, 1, "DB");
+  luaL_argcheck(L, dbu, 1, "DB expected");
+
+  const char *query = luaL_checkstring(L, 2);
+
+  dbu->db->exec(query);
+
+  return 0;
+}
+
+static int db_next(lua_State *L)
+{
+  db_userdata *dbu;
+
+  dbu = (db_userdata *)luaL_checkudata(L, 1, "DB");
+  luaL_argcheck(L, dbu, 1, "DB expected");
+
+  bool more = dbu->db->next();
+
+  lua_pushboolean(L, more);
+
+  return 1;
+}
+
+static int db_new(lua_State *L)
+{
+  db_userdata *dbu;
+  dbu = (db_userdata *)lua_newuserdata(L, sizeof(db_userdata));
+
+  luaL_getmetatable(L, "DB");
+  lua_setmetatable(L, -2);
+
+  dbu->db = new DB("", "", "", "");
+
+  return 1;
+}
+
+static int db_gc(lua_State *L)
+{
+  db_userdata *dbu;
+
+  dbu = (db_userdata *)luaL_checkudata(L, 1, "DB");
+  luaL_argcheck(L, dbu, 1, "DB expected");
+
+  delete dbu->db;
+
+  return 0;
+}
+
+static const struct luaL_Reg db_meths[] = {
+  {"__new", db_new},
+  {"__gc" ,db_gc},
+  {"value", db_value},
+  {"next", db_next},
+  {"exec", db_exec},
+  {NULL, NULL}
+};
+
+void register_db(lua_State *L)
+{
+  luaL_newmetatable(L, "DB");
+  lua_pushliteral(L, "__index");
+  lua_pushvalue(L, -2);
+  lua_rawset(L, -3);
+  luaL_register(L, NULL, db_meths);
+}
+
+/*
+
+Example:
+--------
+db = DB:new(...)
+db.exec('...')
+
+while db.next()
+do
+  val0 = db.value(0)
+  val1 = db.value(1)
+  ...
+end
+
+ */