From 0f9cfacd6cc45f78f1453a8eeb7ffa542dc5dc48 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Wed, 15 Jul 2015 18:43:03 +0200
Subject: Implement SQLite incremental BLOB/TEXT I/O

---
 odb/sqlite/statement.hxx | 68 ++++++++++++++++++++----------------------------
 1 file changed, 28 insertions(+), 40 deletions(-)

(limited to 'odb/sqlite/statement.hxx')

diff --git a/odb/sqlite/statement.hxx b/odb/sqlite/statement.hxx
index 1be0cab..7344daf 100644
--- a/odb/sqlite/statement.hxx
+++ b/odb/sqlite/statement.hxx
@@ -30,7 +30,8 @@ namespace odb
   {
     class connection;
 
-    class LIBODB_SQLITE_EXPORT statement: public odb::statement
+    class LIBODB_SQLITE_EXPORT statement: public odb::statement,
+                                          public active_object
     {
     public:
       typedef sqlite::connection connection_type;
@@ -72,7 +73,7 @@ namespace odb
                  statement_kind sk,
                  const binding* process,
                  bool optimize)
-        : conn_ (conn)
+          : active_object (conn)
       {
         init (text.c_str (), text.size (), sk, process, optimize);
       }
@@ -82,7 +83,7 @@ namespace odb
                  statement_kind sk,
                  const binding* process,
                  bool optimize)
-        : conn_ (conn)
+          : active_object (conn)
       {
         init (text, std::strlen (text), sk, process, optimize);
       }
@@ -93,13 +94,15 @@ namespace odb
                  statement_kind sk,
                  const binding* process,
                  bool optimize)
-        : conn_ (conn)
+          : active_object (conn)
       {
         init (text, text_size, sk, process, optimize);
       }
 
     protected:
-      void
+      // Return true if we bound any stream parameters.
+      //
+      bool
       bind_param (const bind*, std::size_t count);
 
       // Extract row columns into the bound buffers. If the truncated
@@ -110,6 +113,21 @@ namespace odb
       bool
       bind_result (const bind*, std::size_t count, bool truncated = false);
 
+      // Stream (so to speak) parameters.
+      //
+      struct stream_data
+      {
+        std::string db;
+        std::string table;
+        long long rowid;
+      };
+
+      void
+      stream_param (const bind*, std::size_t count, const stream_data&);
+
+      friend void
+      update_hook (void*, const char*, const char*, long long);
+
       // Active state.
       //
     protected:
@@ -146,10 +164,12 @@ namespace odb
         return r;
       }
 
-    protected:
-      friend class sqlite::connection;
+      // The active_object interface.
+      //
+      virtual void
+      clear ();
 
-      connection_type& conn_;
+    protected:
       auto_handle<sqlite3_stmt> stmt_;
 
 #if SQLITE_VERSION_NUMBER < 3005003
@@ -165,38 +185,6 @@ namespace odb
             statement_kind,
             const binding* process,
             bool optimize);
-
-      // Doubly-linked list of active statements.
-      //
-    protected:
-      void
-      list_add ()
-      {
-        next_ = conn_.statements_;
-        conn_.statements_ = this;
-
-        if (next_ != 0)
-          next_->prev_ = this;
-      }
-
-      void
-      list_remove ()
-      {
-        (prev_ == 0 ? conn_.statements_ : prev_->next_) = next_;
-
-        if (next_ != 0)
-          next_->prev_ = prev_;
-
-        prev_ = 0;
-        next_ = this;
-      }
-
-      // prev_ == 0 means we are the first element.
-      // next_ == 0 means we are the last element.
-      // next_ == this means we are not on the list (prev_ should be 0).
-      //
-      statement* prev_;
-      statement* next_;
     };
 
     class LIBODB_SQLITE_EXPORT generic_statement: public statement
-- 
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