added: TextStream a class similar to std::ostringstream

but with a Clear() method
       the dynamic allocated buffer can be easily reused
added: DbTextStream a special version of a stream
       used to create a database string query
       everything is escaped by default
added: DbBase a base class with some basic methods for communicating
       with the database
added: DbConn a class for managing connection to the database
changed: some refactoring in Db class       



git-svn-id: svn://ttmath.org/publicrep/winix/trunk@655 e52654a7-88a9-db11-a3e9-0013d4bc506e

core/textstream.cpp

@@ -0,0 +1,126 @@
+/*
+ * This file is a part of Winix
+ * and is not publicly distributed
+ * 
+ * Copyright (c) 2010, Tomasz Sowa
+ * All rights reserved.
+ * 
+ */
+ 
+#include "textstream.h"
+
+
+
+
+void TextStream::Clear()
+{
+	buffer.clear();
+}
+
+const std::string & TextStream::Str() const
+{
+	return buffer;
+}
+
+
+const char * TextStream::CStr() const
+{
+	return buffer.c_str();
+}
+
+
+
+TextStream & TextStream::operator<<(const char * str)
+{
+	buffer += str;
+
+return *this;
+}
+
+TextStream & TextStream::operator<<(const std::string * str)
+{
+	buffer += *str;
+
+return *this;
+}
+
+TextStream & TextStream::operator<<(const std::string & str)
+{
+	buffer += str;
+
+return *this;
+}
+
+TextStream & TextStream::operator<<(char v)
+{
+	buffer += v;
+
+return *this;
+}
+
+
+TextStream & TextStream::operator<<(int v)
+{
+char buf[50];
+
+	sprintf(buf, "%d", v);
+	buffer += buf;
+
+return *this;
+}
+
+
+TextStream & TextStream::operator<<(long v)
+{
+char buf[50];
+
+	sprintf(buf, "%ld", v);
+	buffer += buf;
+
+return *this;
+}
+
+
+TextStream & TextStream::operator<<(unsigned int v)
+{
+char buf[50];
+
+	sprintf(buf, "%u", v);
+	buffer += buf;
+
+return *this;
+}
+
+
+TextStream & TextStream::operator<<(unsigned long v)
+{
+char buf[50];
+
+	sprintf(buf, "%lu", v);
+	buffer += buf;
+
+return *this;
+}
+
+
+TextStream & TextStream::operator<<(double v)
+{
+char buf[50];
+
+	sprintf(buf, "%f", v);
+	buffer += buf;
+
+return *this;
+}
+
+
+TextStream & TextStream::operator<<(const void * v)
+{
+char buf[50];
+
+	sprintf(buf, "%p", v);
+	buffer += buf;
+
+return *this;
+}
+