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Sql: JoinRef (first iteration)

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git-svn-id: svn://ultimatepp.org/upp/trunk@4264 f0d560ea-af0d-0410-9eb7-867de7ffcac7
This commit is contained in:
cxl 2011-12-07 07:38:09 +00:00
parent 52ba5d1aaa
commit cebc2c14a2
6 changed files with 193 additions and 16 deletions
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81
uppsrc/Sql/IntroSch.cpp Normal file
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#include "Sql.h"
NAMESPACE_UPP
ArrayMap<String, SchTableInfo>& sSchTableInfo()
{
static ArrayMap<String, SchTableInfo> x;
return x;
}
SchTableInfo& SchTableInfo::Column(const char *name)
{
column.Add(name);
ref_table.Add();
ref_column.Add();
return *this;
}
SchTableInfo& SchTableInfo::References(const char *table)
{
ref_table.Top() = table;
return *this;
}
SchTableInfo& SchTableInfo::References(const char *table, const char *column)
{
References(table);
ref_column.Top() = column;
return *this;
}
SchTableInfo& SchDbInfo(const char *table)
{
return sSchTableInfo().GetAdd(table);
}
const SchTableInfo& GetSchTableInfo(const String& table)
{
static SchTableInfo sSchTableInfoZero;
return sSchTableInfo().Get(~table, sSchTableInfoZero);
}
SqlBool Join(const String& tab1, const String& tab2)
{
const SchTableInfo& t1 = GetSchTableInfo(tab1);
const SchTableInfo& t2 = GetSchTableInfo(tab2);
for(int i = 0; i < t1.ref_table.GetCount(); i++)
if(t1.ref_table[i] == tab2)
return SqlId(t1.column[i]).Of(SqlId(tab1)) == SqlId(t2.column[0]).Of(SqlId(tab2));
for(int i = 0; i < t2.ref_table.GetCount(); i++)
if(t2.ref_table[i] == tab1)
return SqlId(t2.column[i]).Of(SqlId(tab2)) == SqlId(t1.column[0]).Of(SqlId(tab1));
return SqlBool::False();
}
SqlBool FindSchJoin(const String& tables)
{
INTERLOCKED {
static VectorMap<String, SqlBool> cache;
if(cache.GetCount() > 20000)
cache.Clear();
int q = cache.Find(tables);
if(q >= 0)
return cache[q];
Vector<String> s = Split(tables, ',');
if(s.GetCount() >= 2) {
String tab1 = s.Top();
for(int i = 0; i < s.GetCount() - 1; i++) {
SqlBool b = Join(tab1, s[i]);
if(!b.IsFalse()) {
cache.Add(tables, b);
return b;
}
}
}
NEVER();
return SqlBool::False();
}
}
END_UPP_NAMESPACE