mirror of
https://github.com/levinsv/pgadmin3.git
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76 lines
2.3 KiB
C++
76 lines
2.3 KiB
C++
//////////////////////////////////////////////////////////////////////////
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//
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// pgScript - PostgreSQL Tools
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//
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// Copyright (C) 2002 - 2016, The pgAdmin Development Team
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// This software is released under the PostgreSQL Licence
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//
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//////////////////////////////////////////////////////////////////////////
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#include "pgAdmin3.h"
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#include "pgscript/generators/pgsReferenceGen.h"
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#include "pgscript/expressions/pgsExecute.h"
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#include "pgscript/objects/pgsNumber.h"
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#include "pgscript/objects/pgsRecord.h"
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#include "pgscript/utilities/pgsThread.h"
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pgsReferenceGen::pgsReferenceGen(pgsThread *app, const wxString &table,
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const wxString &column, const bool &sequence, const long &seed) :
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pgsObjectGen(seed), m_app(app), m_table(table), m_column(column),
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m_sequence(sequence)
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{
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// We need an empty symbol table for calling pgsExecute.eval(...)
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pgsVarMap vars;
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// Count the number of lines in the table
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pgsOperand result = pgsExecute(wxString() << wxT("SELECT count(*) FROM ")
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<< m_table, 0, m_app).eval(vars);
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wxASSERT(result->is_record());
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wxString value = result->value();
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if (!value.IsEmpty())
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{
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m_nb_rows = pgsMapm::pgs_str_mapm(result->number().value());
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}
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else
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{
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m_nb_rows = 0;
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}
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wxLogScriptVerbose(wxT("REFGEN: Number of rows in %s: %s"), m_table.c_str(),
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pgsMapm::pgs_mapm_str(m_nb_rows).c_str());
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// Create an integer generator with that number of lines
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m_randomizer = pgsRandomizer(pnew pgsIntegerGen(0, m_nb_rows - 1,
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is_sequence(), m_seed));
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}
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bool pgsReferenceGen::is_sequence() const
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{
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return m_sequence;
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}
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wxString pgsReferenceGen::random()
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{
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// We need an empty symbol table for calling pgsExecute.eval(...)
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pgsVarMap vars;
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// Choose one line
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pgsOperand result = pgsExecute(wxString() << wxT("SELECT ") << m_column
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<< wxT(" FROM ") << m_table << wxT(" LIMIT 1 OFFSET ")
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<< m_randomizer->random(), 0, m_app).eval(vars);
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wxASSERT(result->is_record());
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// Return the result as a single value
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return dynamic_cast<const pgsRecord &>(*result).get(0, 0)->value();
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}
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pgsReferenceGen::~pgsReferenceGen()
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{
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}
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pgsReferenceGen *pgsReferenceGen::clone()
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{
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return pnew pgsReferenceGen(*this);
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}
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