added error logging capability for sqlite3,

which is an irrelevant digression, since it already
reports errors on calls

Maybe I will get reports if I fail to finalize a compiled
sql statement before shutting down a database connection,
but the most likely circumstance for this to happen is
on program close, when I am unlikely to be able to see
the log.

src/ISqlit3Impl.cpp

@@ -59,7 +59,13 @@ static auto error_message(int rc, sqlite3* pdb) {
 	return std::string("Sqlite3 Error: ") + sqlite3_errmsg(pdb) + ". Sqlite3 error number=" + std::to_string(rc);
 }
 
-void sqlite3_init() {
+void sqlite3_init(void (*SqliteErrorLogCallback_ptr)(void*, int, const char*)) {
+	//	We are setting up a global Error logging callback for all database connections
+	//	Maybe in future we will need separate call back for each database connection,
+	//	Which sqlite also supports, but do not need to think about it now.
+	if (sqlite3_config(SQLITE_CONFIG_LOG, SqliteErrorLogCallback_ptr, nullptr) != SQLITE_OK) {
+		throw MyException("huh, cannot log?");
+	}
 	if (sqlite3_initialize() != SQLITE_OK) {
 		errorCode = 7;
 		szError = "Fatal Error:  Sqlite library did not init.";

src/ISqlite3.h

@@ -87,7 +87,7 @@ ISqlite3* Sqlite3_create(const char*);//The actual run time object is the derive
 Icompiled_sql* sqlite3_prepare(ISqlite3*, const char *);//The actual run time object is the derived class
 //Which lives a symbol space that is kept separate from wxWidgets C++ space
 
-void sqlite3_init();
+void sqlite3_init(void (*SqliteErrorLogCallback_ptr)(void*, int, const char*));
 extern "C" {
 	int sqlite3_shutdown(void);
 }

src/frame.cpp

@@ -132,6 +132,10 @@ void RecursiveCreateDirectory(wxFileName& fn){
 	}
 }
 
+static void SqliteErrorLogCallback(void* pArg, int iErrCode, const char* zMsg) {
+	wxLogMessage(wxT("SqliteLogMessage (%d) %s\n"), iErrCode, zMsg);
+}
+
 // main frame ctor
 Frame::Frame(const wxString& wxs)
 	: wxFrame(nullptr, myID_MAINFRAME, wxs, wxDefaultPosition, wxDefaultSize, wxDEFAULT_FRAME_STYLE, wxs),
@@ -142,7 +146,7 @@ Frame::Frame(const wxString& wxs)
 		assert(singletonFrame == nullptr);
 		singletonFrame = this;
 		SetIcon(wxICON(AAArho));
-		sqlite3_init();
+		sqlite3_init(&SqliteErrorLogCallback);
 		if (sodium_init() < 0) {
 			szError = "Fatal Error:  Encryption library did not init.";
 			errorCode = 6;