New templated query_columns architecture

We also now use the correct separate "role"-base join approach instead of
having a single merged join for each table.

3 files changed, 77 insertions, 62 deletions

diff --git a/odb/mysql/query.cxx b/odb/mysql/query.cxx
index ca858b1..14477d6 100644
--- a/odb/mysql/query.cxx
+++ b/odb/mysql/query.cxx
@@ -84,11 +84,9 @@ namespace odb
     }
 
     void query::
-    append (const string& q, clause_part::kind_type k)
+    append (const string& q)
     {
-      if (k == clause_part::native &&
-          !clause_.empty () &&
-          clause_.back ().kind == clause_part::native)
+      if (!clause_.empty () && clause_.back ().kind == clause_part::native)
       {
         string& s (clause_.back ().part);
 
@@ -105,7 +103,19 @@ namespace odb
         s += q;
       }
       else
-        clause_.push_back (clause_part (k, q));
+        clause_.push_back (clause_part (clause_part::native, q));
+    }
+
+    void query::
+    append (const char* table, const char* column)
+    {
+      string s ("`");
+      s += table;
+      s += "`.`";
+      s += column;
+      s += '`';
+
+      clause_.push_back (clause_part (clause_part::column, s));
     }
 
     void query::
@@ -157,7 +167,7 @@ namespace odb
     }
 
     string query::
-    clause (string const& table) const
+    clause () const
     {
       string r;
 
@@ -173,9 +183,6 @@ namespace odb
             if (last != ' ' && last != '(')
               r += ' ';
 
-            if (i->part[0] == '.')
-              r += table;
-
             r += i->part;
             break;
           }
diff --git a/odb/mysql/query.hxx b/odb/mysql/query.hxx
index 17aa724..57d43a1 100644
--- a/odb/mysql/query.hxx
+++ b/odb/mysql/query.hxx
@@ -107,11 +107,16 @@ namespace odb
       }
 
       explicit
-      query (const std::string& q,
-             clause_part::kind_type k = clause_part::native)
+      query (const std::string& native)
         : binding_ (0, 0)
       {
-        clause_.push_back (clause_part (k, q));
+        clause_.push_back (clause_part (clause_part::native, native));
+      }
+
+      query (const char* table, const char* column)
+        : binding_ (0, 0)
+      {
+        append (table, column);
       }
 
       template <typename T>
@@ -140,7 +145,7 @@ namespace odb
 
     public:
       std::string
-      clause (std::string const& default_table) const;
+      clause () const;
 
       binding&
       parameters_binding () const;
@@ -167,7 +172,7 @@ namespace odb
       query&
       operator+= (const std::string& q)
       {
-        append (q, clause_part::native);
+        append (q);
         return *this;
       }
 
@@ -197,7 +202,10 @@ namespace odb
       append (ref_bind<T>);
 
       void
-      append (const std::string&, clause_part::kind_type);
+      append (const std::string& native);
+
+      void
+      append (const char* table, const char* column);
 
     private:
       void
@@ -364,16 +372,23 @@ namespace odb
     template <typename T, database_type_id ID>
     struct query_column
     {
-      explicit
-      query_column (const char* name)
-          : name_ (name)
+      // Note that we keep shalow copies of the table and column names.
+      //
+      query_column (const char* table, const char* column)
+          : table_ (table), column_ (column)
       {
       }
 
       const char*
-      name () const
+      table () const
       {
-        return name_;
+        return table_;
+      }
+
+      const char*
+      column () const
+      {
+        return column_;
       }
 
       // is_null, is_not_null
@@ -382,7 +397,7 @@ namespace odb
       query
       is_null () const
       {
-        query q (name_, query::clause_part::column);
+        query q (table_, column_);
         q += "IS NULL";
         return q;
       }
@@ -390,7 +405,7 @@ namespace odb
       query
       is_not_null () const
       {
-        query q (name_, query::clause_part::column);
+        query q (table_, column_);
         q += "IS NOT NULL";
         return q;
       }
@@ -426,7 +441,7 @@ namespace odb
       query
       equal (val_bind<T> v) const
       {
-        query q (name_, query::clause_part::column);
+        query q (table_, column_);
         q += "=";
         q.append<T, ID> (v);
         return q;
@@ -443,7 +458,7 @@ namespace odb
       query
       equal (ref_bind<T> r) const
       {
-        query q (name_, query::clause_part::column);
+        query q (table_, column_);
         q += "=";
         q.append<T, ID> (r);
         return q;
@@ -511,7 +526,7 @@ namespace odb
       query
       unequal (val_bind<T> v) const
       {
-        query q (name_, query::clause_part::column);
+        query q (table_, column_);
         q += "!=";
         q.append<T, ID> (v);
         return q;
@@ -528,7 +543,7 @@ namespace odb
       query
       unequal (ref_bind<T> r) const
       {
-        query q (name_, query::clause_part::column);
+        query q (table_, column_);
         q += "!=";
         q.append<T, ID> (r);
         return q;
@@ -596,7 +611,7 @@ namespace odb
       query
       less (val_bind<T> v) const
       {
-        query q (name_, query::clause_part::column);
+        query q (table_, column_);
         q += "<";
         q.append<T, ID> (v);
         return q;
@@ -613,7 +628,7 @@ namespace odb
       query
       less (ref_bind<T> r) const
       {
-        query q (name_, query::clause_part::column);
+        query q (table_, column_);
         q += "<";
         q.append<T, ID> (r);
         return q;
@@ -681,7 +696,7 @@ namespace odb
       query
       greater (val_bind<T> v) const
       {
-        query q (name_, query::clause_part::column);
+        query q (table_, column_);
         q += ">";
         q.append<T, ID> (v);
         return q;
@@ -698,7 +713,7 @@ namespace odb
       query
       greater (ref_bind<T> r) const
       {
-        query q (name_, query::clause_part::column);
+        query q (table_, column_);
         q += ">";
         q.append<T, ID> (r);
         return q;
@@ -766,7 +781,7 @@ namespace odb
       query
       less_equal (val_bind<T> v) const
       {
-        query q (name_, query::clause_part::column);
+        query q (table_, column_);
         q += "<=";
         q.append<T, ID> (v);
         return q;
@@ -783,7 +798,7 @@ namespace odb
       query
       less_equal (ref_bind<T> r) const
       {
-        query q (name_, query::clause_part::column);
+        query q (table_, column_);
         q += "<=";
         q.append<T, ID> (r);
         return q;
@@ -851,7 +866,7 @@ namespace odb
       query
       greater_equal (val_bind<T> v) const
       {
-        query q (name_, query::clause_part::column);
+        query q (table_, column_);
         q += ">=";
         q.append<T, ID> (v);
         return q;
@@ -868,7 +883,7 @@ namespace odb
       query
       greater_equal (ref_bind<T> r) const
       {
-        query q (name_, query::clause_part::column);
+        query q (table_, column_);
         q += ">=";
         q.append<T, ID> (r);
         return q;
@@ -935,9 +950,9 @@ namespace odb
         //
         (void) (sizeof (type_instance<T> () == type_instance<T2> ()));
 
-        query q (name_, query::clause_part::column);
+        query q (table_, column_);
         q += "=";
-        q.append (c.name (), query::clause_part::column);
+        q.append (c.table (), c.column ());
         return q;
       }
 
@@ -949,9 +964,9 @@ namespace odb
         //
         (void) (sizeof (type_instance<T> () != type_instance<T2> ()));
 
-        query q (name_, query::clause_part::column);
+        query q (table_, column_);
         q += "!=";
-        q.append (c.name (), query::clause_part::column);
+        q.append (c.table (), c.column ());
         return q;
       }
 
@@ -963,9 +978,9 @@ namespace odb
         //
         (void) (sizeof (type_instance<T> () < type_instance<T2> ()));
 
-        query q (name_, query::clause_part::column);
+        query q (table_, column_);
         q += "<";
-        q.append (c.name (), query::clause_part::column);
+        q.append (c.table (), c.column ());
         return q;
       }
 
@@ -977,9 +992,9 @@ namespace odb
         //
         (void) (sizeof (type_instance<T> () > type_instance<T2> ()));
 
-        query q (name_, query::clause_part::column);
+        query q (table_, column_);
         q += ">";
-        q.append (c.name (), query::clause_part::column);
+        q.append (c.table (), c.column ());
         return q;
       }
 
@@ -991,9 +1006,9 @@ namespace odb
         //
         (void) (sizeof (type_instance<T> () <= type_instance<T2> ()));
 
-        query q (name_, query::clause_part::column);
+        query q (table_, column_);
         q += "<=";
-        q.append (c.name (), query::clause_part::column);
+        q.append (c.table (), c.column ());
         return q;
       }
 
@@ -1005,14 +1020,15 @@ namespace odb
         //
         (void) (sizeof (type_instance<T> () >= type_instance<T2> ()));
 
-        query q (name_, query::clause_part::column);
+        query q (table_, column_);
         q += ">=";
-        q.append (c.name (), query::clause_part::column);
+        q.append (c.table (), c.column ());
         return q;
       }
 
     private:
-      const char* name_;
+      const char* table_;
+      const char* column_;
     };
 
     //
@@ -1814,13 +1830,6 @@ namespace odb
         : query_selector<T>::type (qc)
     {
     }
-
-    std::string
-    clause () const
-    {
-      return query_selector<T>::type::clause (
-        query_selector<T>::table_name ());
-    }
   };
 }
 
diff --git a/odb/mysql/query.txx b/odb/mysql/query.txx
index 6addb65..c28155d 100644
--- a/odb/mysql/query.txx
+++ b/odb/mysql/query.txx
@@ -15,12 +15,11 @@ namespace odb
     query (const query_column<bool, ID>& c)
         : binding_ (0, 0)
     {
-      clause_.push_back (clause_part (clause_part::column, c.name ()));
-
       // Cannot use IS TRUE here since database type can be a non-
       // integral type.
       //
-      clause_.push_back (clause_part (clause_part::native, "="));
+      append (c.table (), c.column ());
+      append ("=");
       append<bool, ID> (val_bind<bool> (true));
     }
 
@@ -30,7 +29,7 @@ namespace odb
     query query_column<T, ID>::
     in (const T& v1, const T& v2) const
     {
-      query q (name_, query::clause_part::column);
+      query q (table_, column_);
       q += "IN (";
       q.append<T, ID> (val_bind<T> (v1));
       q += ",";
@@ -43,7 +42,7 @@ namespace odb
     query query_column<T, ID>::
     in (const T& v1, const T& v2, const T& v3) const
     {
-      query q (name_, query::clause_part::column);
+      query q (table_, column_);
       q += "IN (";
       q.append<T, ID> (val_bind<T> (v1));
       q += ",";
@@ -58,7 +57,7 @@ namespace odb
     query query_column<T, ID>::
     in (const T& v1, const T& v2, const T& v3, const T& v4) const
     {
-      query q (name_, query::clause_part::column);
+      query q (table_, column_);
       q += "IN (";
       q.append<T, ID> (val_bind<T> (v1));
       q += ",";
@@ -75,7 +74,7 @@ namespace odb
     query query_column<T, ID>::
     in (const T& v1, const T& v2, const T& v3, const T& v4, const T& v5) const
     {
-      query q (name_, query::clause_part::column);
+      query q (table_, column_);
       q += "IN (";
       q.append<T, ID> (val_bind<T> (v1));
       q += ",";
@@ -95,7 +94,7 @@ namespace odb
     query query_column<T, ID>::
     in_range (I begin, I end) const
     {
-      query q (name_, query::clause_part::column);
+      query q (table_, column_);
       q += "IN (";
 
       for (I i (begin); i != end; ++i)