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Patch level : 12.0 no-patch

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Files correlati     : include
Commento            : Aggiunta funzione TISAM_recordset::add_between_filter() che passato nome campo, from_val e to_val restituisce between, >= o <= in CampoSQL
This commit is contained in:
Mattia Tollari 2019-03-12 12:54:04 +01:00
parent 18f4c6985c
commit 3260e84ab5
2 changed files with 37 additions and 1 deletions
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30
src/include/recset.cpp
View File

@ -1652,6 +1652,36 @@ const TString& TISAM_recordset::driver_version() const
return tmp; return tmp;
} }
TString& TISAM_recordset::add_between_filter(const TString& field, const TString& from_val, const TString& to_val,
TString from_fld, TString to_fld)
{
// Se from_fld e to_fld sono vuoti vengono valorizzati con il nome del campo preceduti da #DA e #A
if (from_fld.empty() || to_fld.empty())
{
const TString qf = field.find('.') < 0 ? field : field.sub(field.find('.') + 1);
if (from_fld.empty())
from_fld << "#DA" << qf;
if (to_fld.empty())
to_fld << "#A" << qf;
}
TString& ret = get_tmp_string();
if (from_val.full() && to_val.full())
{
ret << "&&(BETWEEN(" << field << ", " << from_fld << ", " << to_fld << "))";
}
else if (from_val.full())
{
ret << "&&(" << field << ">=" << from_fld << ")";
}
else if (to_val.full())
{
ret << "&&(" << field << "<=" << to_fld << ")";
}
return ret;
}
TISAM_recordset::TISAM_recordset(const char* use) TISAM_recordset::TISAM_recordset(const char* use)
: _relation(NULL), _cursor(NULL) : _relation(NULL), _cursor(NULL)
{ {

8
src/include/recset.h
View File

@ -167,6 +167,13 @@ public:
virtual const TString& driver_version() const; virtual const TString& driver_version() const;
virtual const TString& query_text() const { return _use; } virtual const TString& query_text() const { return _use; }
// Utility
/* Ritorna un filtro che può essere:
* from_val && to_val: field between
* solo from_from: field >= from_val
* solo to_from: field <= to_val */
static TString& add_between_filter(const TString& field, const TString& from_val, const TString& to_val, TString from_fld = "", TString to_fld = "");
TISAM_recordset(const char* use); TISAM_recordset(const char* use);
virtual ~TISAM_recordset(); virtual ~TISAM_recordset();
}; };
@ -181,5 +188,4 @@ const TString& logic2table(int logic_num);
int table2logic(const TString& name); int table2logic(const TString& name);
TRecordset* create_recordset(const TString& sql); TRecordset* create_recordset(const TString& sql);
#endif #endif