Support for views; integrated part

1 files changed, 310 insertions, 29 deletions

diff --git a/common/view/test.hxx b/common/view/test.hxx
index 5eba5d5..3ba6745 100644
--- a/common/view/test.hxx
+++ b/common/view/test.hxx
@@ -7,11 +7,13 @@
 #define TEST_HXX
 
 #include <string>
-#include <memory>
+#include <vector>
 #include <cstddef> // std::size_t
-#include <iostream>
 
 #include <odb/core.hxx>
+#include <odb/nullable.hxx>
+
+struct employer;
 
 #pragma db object
 struct country
@@ -31,23 +33,43 @@ struct country
   std::string name;
 };
 
+enum gender_type {male, female};
+
+#pragma db value
+struct measures
+{
+  measures (unsigned short w, unsigned short h) : weight (w), hight (h) {}
+  measures () {}
+
+  unsigned short weight;
+  unsigned short hight;
+};
+
 #pragma db object
 struct person
 {
+  typedef ::measures measures_type;
+
   person (unsigned long i,
           const std::string& fn,
           const std::string& ln,
           unsigned short a,
-          country* l)
-      : id (i), first_name (fn), last_name (ln), age (a), location (l)
+          gender_type g,
+          const measures_type m,
+          country* r,
+          country* n)
+      : id (i),
+        first_name_ (fn),
+        last_name_ (ln),
+        age (a),
+        gender (g),
+        measures (m),
+        residence (r),
+        nationality (n),
+        husband (0)
   {
   }
 
-  ~person ()
-  {
-    delete location;
-  }
-
   person ()
   {
   }
@@ -56,18 +78,57 @@ struct person
   unsigned long id;
 
   #pragma db column ("first")
-  std::string first_name;
+  std::string first_name_;
 
   #pragma db column ("last")
-  std::string last_name;
+  std::string last_name_;
 
   unsigned short age;
 
+  // #pragma db type("INT") - in MySQL test type pragma copying
+  gender_type gender;
+
+  measures_type measures;
+
+  #pragma db not_null
+  country* residence;
+
   #pragma db not_null
-  country* location;
+  country* nationality;
+
+  #pragma db inverse(employees)
+  employer* employed_by;
+
+  // A non-pointer relationship.
+  //
+  odb::nullable<std::string> previous_employer;
+
+  person* husband; // Self-reference.
+};
+
+#pragma db object
+struct employer
+{
+  employer (const std::string& n)
+      : name (n)
+  {
+  }
+
+  employer ()
+  {
+  }
+
+  #pragma db id
+  std::string name;
+  std::size_t head_count;
+  std::vector<person*> employees;
 };
 
-// General view with a custom query.
+//
+// General view with no associated objects.
+//
+
+// Complete suffix query template.
 //
 #pragma db view query("SELECT first, last, age FROM common_view_person")
 struct view1
@@ -77,37 +138,257 @@ struct view1
   unsigned short age;
 };
 
-// Count view.
+// Complete query.
+//
+#pragma db view query("SELECT first, last, age " \
+                      "FROM common_view_person " \
+                      "WHERE age < 31 ORDER BY age")
+struct view1a
+{
+  std::string first;
+  std::string last;
+  unsigned short age;
+};
+
+// Complete placeholder query template.
+//
+#pragma db view query("SELECT first, last, age " \
+                      "FROM common_view_person " \
+                      "WHERE age < 31 AND (?) ORDER BY age")
+struct view1b
+{
+  std::string first;
+  std::string last;
+  unsigned short age;
+};
+
+// Runtime query.
 //
-#pragma db view query("SELECT count(id) FROM common_view_person")
+#pragma db view query()
+struct view1c
+{
+  std::string first;
+  std::string last;
+  unsigned short age;
+};
+
+//
+// Count view plus associated object.
+//
+
+// Complete suffix query.
+//
+#pragma db view object(person) \
+  query("SELECT count(id) FROM common_view_person")
 struct view2
 {
   std::size_t count;
 };
 
-// Aggregate view.
+// Generated query, literal column.
+//
+#pragma db view object(person)
+struct view2a
+{
+  #pragma db column("count(id)")
+  std::size_t count;
+};
+
+// Generated query, qualified literal column.
 //
-#pragma db view query("SELECT last, count(last) " \
-                      "FROM common_view_person "  \
-                      "GROUP BY last")
+#pragma db view object(person)
+struct view2b
+{
+  #pragma db column("count(common_view_person.id)")
+  std::size_t count;
+};
+
+// Generated query, expression column.
+//
+#pragma db view object(person)
+struct view2c
+{
+  #pragma db column("count(" + person::id + ")")
+  std::size_t count;
+};
+
+//
+// Aggregate view plus associated object with a custom alias.
+//
+
+// Complete suffix query.
+//
+#pragma db view object(person = test) \
+  query("SELECT last, count(last) "   \
+        "FROM common_view_person "    \
+        "GROUP BY last")
 struct view3
 {
-  std::string last;
+  std::string last_name;
   std::size_t count;
 };
 
-// JOIN view.
+// Generated query with integrated query condition and placeholder.
 //
-#pragma db view query("SELECT first, last, common_view_country.name " \
-                      "FROM common_view_person "                      \
-                      "LEFT JOIN common_view_country "                \
-                      "ON common_view_person.location = "             \
-                        "common_view_country.code")
+#pragma db view object(person = test) \
+  query((?) + "GROUP BY" + test::last_name_)
+struct view3a
+{
+  // Automatically resolved to test::last_name_.
+  //
+  std::string last_name;
+
+  #pragma db column("count(" + test::last_name_ + ")")
+  std::size_t count;
+};
+
+//
+// JOIN view plus associated objects, some with custom aliases.
+//
+
+// Complete suffix query.
+//
+#pragma db view object(person) object(country = residence)  \
+  query("SELECT first, last, residence.name "               \
+        "FROM common_view_person "                          \
+        "LEFT JOIN common_view_country AS residence "       \
+        "ON common_view_person.residence = residence.code")
 struct view4
 {
-  std::string first;
-  std::string last;
-  std::string location;
+  std::string first_name;
+  std::string last_name;
+  std::string name;
+};
+
+// Generated query.
+//
+#pragma db view object(person) \
+  object(country = residence: person::residence)
+struct view4a
+{
+  std::string first_name;
+  std::string last_name;
+  std::string name;
+};
+
+//
+// JOIN the same object twice.
+//
+#pragma db view object(person) \
+  object(country = residence: person::residence) \
+  object(country = nationality: person::nationality) \
+  query((?) + "ORDER BY" + person::age)
+struct view5
+{
+  std::string first_name;
+  std::string last_name;
+
+  #pragma db column(residence::name)
+  std::string rname;
+
+  #pragma db column(nationality::name)
+  std::string nname;
+};
+
+//
+// JOIN via one(i)-to-many relationship.
+//
+
+// Automatic relationship discovery.
+//
+#pragma db view object(person) object(employer)
+struct view6
+{
+  std::string first_name;
+  std::string last_name;
+
+  #pragma db column(::employer::name)
+  std::string employer;
+};
+
+// Manual relationship specification, left side.
+//
+#pragma db view object(person) object(employer: person::employed_by)
+struct view6a
+{
+  std::string first_name;
+  std::string last_name;
+
+  #pragma db column(::employer::name)
+  std::string employer;
+};
+
+// Manual relationship specification, right side.
+//
+#pragma db view object(person) object(employer: employer::employees)
+struct view6b
+{
+  std::string first_name;
+  std::string last_name;
+
+  #pragma db column(::employer::name)
+  std::string employer;
+};
+
+//
+// JOIN via a custom condition.
+//
+#pragma db view object(person) \
+  object(employer: person::previous_employer == employer::name)\
+  query((?) + "ORDER BY" + person::age)
+struct view7
+{
+  std::string first_name;
+  std::string last_name;
+
+  odb::nullable<std::size_t> head_count;
+};
+
+//
+// Self-JOIN.
+//
+#pragma db view object(person = wife) object(person = husb) \
+  query (wife::husband.is_not_null ())
+struct view8
+{
+  #pragma db column (wife::first_name_)
+  std::string wife_name;
+
+  #pragma db column (husb::first_name_)
+  std::string husb_name;
+};
+
+//
+// Enum mapping.
+//
+#pragma db view object(person)
+struct view9
+{
+  std::string first_name;
+  std::string last_name;
+  gender_type gender;
+};
+
+//
+// Composite in view.
+//
+#pragma db view object(person) query((?) + "ORDER BY" + person::age)
+struct view10
+{
+  std::string last_name;
+  ::measures measures;
+};
+
+//
+// Composite in object.
+//
+#pragma db view object(person) query((?) + "ORDER BY" + person::age)
+struct view11
+{
+  std::string last_name;
+
+  #pragma db column (person::measures.hight)
+  unsigned short hight;
 };
 
 #endif // TEST_HXX