init

pgscript/generators/pgsReferenceGen.cpp

@@ -0,0 +1,76 @@
+//////////////////////////////////////////////////////////////////////////
+//
+// pgScript - PostgreSQL Tools
+//
+// Copyright (C) 2002 - 2016, The pgAdmin Development Team
+// This software is released under the PostgreSQL Licence
+//
+//////////////////////////////////////////////////////////////////////////
+
+
+#include "pgAdmin3.h"
+#include "pgscript/generators/pgsReferenceGen.h"
+
+#include "pgscript/expressions/pgsExecute.h"
+#include "pgscript/objects/pgsNumber.h"
+#include "pgscript/objects/pgsRecord.h"
+#include "pgscript/utilities/pgsThread.h"
+
+pgsReferenceGen::pgsReferenceGen(pgsThread *app, const wxString &table,
+                                 const wxString &column, const bool &sequence, const long &seed) :
+	pgsObjectGen(seed), m_app(app), m_table(table), m_column(column),
+	m_sequence(sequence)
+{
+	// We need an empty symbol table for calling pgsExecute.eval(...)
+	pgsVarMap vars;
+
+	// Count the number of lines in the table
+	pgsOperand result = pgsExecute(wxString() << wxT("SELECT count(*) FROM ")
+	                               << m_table, 0, m_app).eval(vars);
+	wxASSERT(result->is_record());
+	wxString value = result->value();
+	if (!value.IsEmpty())
+	{
+		m_nb_rows = pgsMapm::pgs_str_mapm(result->number().value());
+	}
+	else
+	{
+		m_nb_rows = 0;
+	}
+	wxLogScriptVerbose(wxT("REFGEN: Number of rows in %s: %s"), m_table.c_str(),
+	                   pgsMapm::pgs_mapm_str(m_nb_rows).c_str());
+
+	// Create an integer generator with that number of lines
+	m_randomizer = pgsRandomizer(pnew pgsIntegerGen(0, m_nb_rows - 1,
+	                             is_sequence(), m_seed));
+}
+
+bool pgsReferenceGen::is_sequence() const
+{
+	return m_sequence;
+}
+
+wxString pgsReferenceGen::random()
+{
+	// We need an empty symbol table for calling pgsExecute.eval(...)
+	pgsVarMap vars;
+
+	// Choose one line
+	pgsOperand result = pgsExecute(wxString() << wxT("SELECT ") << m_column
+	                               << wxT(" FROM ") << m_table << wxT(" LIMIT 1 OFFSET ")
+	                               << m_randomizer->random(), 0, m_app).eval(vars);
+	wxASSERT(result->is_record());
+
+	// Return the result as a single value
+	return dynamic_cast<const pgsRecord &>(*result).get(0, 0)->value();
+}
+
+pgsReferenceGen::~pgsReferenceGen()
+{
+
+}
+
+pgsReferenceGen *pgsReferenceGen::clone()
+{
+	return pnew pgsReferenceGen(*this);
+}