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Make float database operations more consistent.

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We don't use floats in GnuCash, we use doubles (and those as little as
possible), but dbd-sqlite3 is broken in that it stores only floats.
Simply casting floats to doubles introduces bogus additional digits
that can cause round-trip tests to fail. Instead convert floats to
doubles by multiplying by 10E6, rounding, then dividing by 10E6.
This commit is contained in:
John Ralls
2018-06-02 16:16:41 -07:00
parent 3e052e8dac
commit 9db60ca63c
5 changed files with 9 additions and 7 deletions
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6
libgnucash/backend/dbi/gnc-dbisqlresult.cpp
View File

@@ -30,6 +30,7 @@ extern "C"
/* For direct access to dbi data structs, sadly needed for datetime */
#include <dbi/dbi-dev.h>
}
#include <cmath>
#include <gnc-datetime.hpp>
#include "gnc-dbisqlresult.hpp"
#include "gnc-dbisqlconnection.hpp"
@@ -109,7 +110,7 @@ GncDbiSqlResult::IteratorImpl::get_int_at_col(const char* col) const
return dbi_result_get_longlong (m_inst->m_dbi_result, col);
}
float
double
GncDbiSqlResult::IteratorImpl::get_float_at_col(const char* col) const
{
auto type = dbi_result_get_field_type (m_inst->m_dbi_result, col);
@@ -118,8 +119,9 @@ GncDbiSqlResult::IteratorImpl::get_float_at_col(const char* col) const
(attrs & DBI_DECIMAL_SIZEMASK) != DBI_DECIMAL_SIZE4)
throw (std::invalid_argument{"Requested float from non-float column."});
auto locale = gnc_push_locale (LC_NUMERIC, "C");
auto retval = dbi_result_get_float(m_inst->m_dbi_result, col);
auto interim = dbi_result_get_float(m_inst->m_dbi_result, col);
gnc_pop_locale (LC_NUMERIC, locale);
double retval = static_cast<double>(round(interim * 1000000.0)) / 1000000.0;
return retval;
}

2
libgnucash/backend/dbi/gnc-dbisqlresult.hpp
View File

@@ -54,7 +54,7 @@ protected:
virtual GncSqlRow& operator++(int) { return ++(*this); };
virtual GncSqlResult* operator*() { return m_inst; }
virtual int64_t get_int_at_col (const char* col) const;
virtual float get_float_at_col (const char* col) const;
virtual double get_float_at_col (const char* col) const;
virtual double get_double_at_col (const char* col) const;
virtual std::string get_string_at_col (const char* col)const;
virtual time64 get_time64_at_col (const char* col) const;