From 9155251867692cb212c26fd5380abc0815c2f44b Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Mon, 21 Feb 2011 12:47:58 +0200
Subject: Factor out active statement cancelling into separate function

---
 odb/mysql/connection-factory.cxx |  2 ++
 odb/mysql/connection.cxx         |  7 +++++++
 odb/mysql/connection.hxx         | 12 ++++++++++++
 odb/mysql/database.cxx           |  2 ++
 odb/mysql/statement.cxx          | 24 ++++++++----------------
 odb/mysql/transaction-impl.cxx   |  7 ++-----
 6 files changed, 33 insertions(+), 21 deletions(-)

diff --git a/odb/mysql/connection-factory.cxx b/odb/mysql/connection-factory.cxx
index 2f1b00c..2d86b82 100644
--- a/odb/mysql/connection-factory.cxx
+++ b/odb/mysql/connection-factory.cxx
@@ -229,7 +229,9 @@ namespace odb
     void connection_pool_factory::
     release (pooled_connection* c)
     {
+      c->clear ();
       c->pool_ = 0;
+
       lock l (mutex_);
 
       // Determine if we need to keep or free this connection.
diff --git a/odb/mysql/connection.cxx b/odb/mysql/connection.cxx
index 98fd427..cfdd26c 100644
--- a/odb/mysql/connection.cxx
+++ b/odb/mysql/connection.cxx
@@ -8,6 +8,7 @@
 
 #include <odb/mysql/database.hxx>
 #include <odb/mysql/connection.hxx>
+#include <odb/mysql/statement.hxx>
 #include <odb/mysql/error.hxx>
 #include <odb/mysql/exceptions.hxx>
 #include <odb/mysql/statement-cache.hxx>
@@ -92,6 +93,12 @@ namespace odb
       }
     }
 
+    void connection::
+    clear_ ()
+    {
+      active_->cancel (); // Should clear itself from active_.
+    }
+
     MYSQL_STMT* connection::
     alloc_stmt_handle ()
     {
diff --git a/odb/mysql/connection.hxx b/odb/mysql/connection.hxx
index 16d3438..89103c7 100644
--- a/odb/mysql/connection.hxx
+++ b/odb/mysql/connection.hxx
@@ -94,6 +94,15 @@ namespace odb
           free_stmt_handles ();
       }
 
+      // Cancel and clear the active statement, if any.
+      //
+      void
+      clear ()
+      {
+        if (active_ != 0)
+          clear_ ();
+      }
+
     public:
       MYSQL_STMT*
       alloc_stmt_handle ();
@@ -109,6 +118,9 @@ namespace odb
       void
       free_stmt_handles ();
 
+      void
+      clear_ ();
+
     private:
       database_type& db_;
       bool failed_;
diff --git a/odb/mysql/database.cxx b/odb/mysql/database.cxx
index 72b18d8..31d6c7b 100644
--- a/odb/mysql/database.cxx
+++ b/odb/mysql/database.cxx
@@ -218,6 +218,8 @@ namespace odb
         throw not_in_transaction ();
 
       connection_type& c (transaction::current ().connection ());
+      c.clear ();
+
       MYSQL* h (c.handle ());
 
       if (mysql_real_query (h, s, static_cast<unsigned long> (n)))
diff --git a/odb/mysql/statement.cxx b/odb/mysql/statement.cxx
index 7ab9c04..b311dbe 100644
--- a/odb/mysql/statement.cxx
+++ b/odb/mysql/statement.cxx
@@ -68,8 +68,7 @@ namespace odb
           data_ (data),
           data_version_ (0)
     {
-      if (statement* a = conn_.active ())
-        a->cancel ();
+      conn_.clear ();
 
       if (mysql_stmt_prepare (stmt_, s.c_str (), s.size ()) != 0)
         translate_error (conn_, stmt_);
@@ -78,8 +77,7 @@ namespace odb
     void select_statement::
     execute ()
     {
-      if (statement* a = conn_.active ())
-        a->cancel ();
+      conn_.clear ();
 
       if (cached_)
         free_result ();
@@ -230,8 +228,7 @@ namespace odb
     insert_statement (connection& conn, const string& s, binding& data)
         : statement (conn), data_ (data), data_version_ (0)
     {
-      if (statement* a = conn_.active ())
-        a->cancel ();
+      conn_.clear ();
 
       if (mysql_stmt_prepare (stmt_, s.c_str (), s.size ()) != 0)
         translate_error (conn_, stmt_);
@@ -240,8 +237,7 @@ namespace odb
     bool insert_statement::
     execute ()
     {
-      if (statement* a = conn_.active ())
-        a->cancel ();
+      conn_.clear ();
 
       if (mysql_stmt_reset (stmt_))
         translate_error (conn_, stmt_);
@@ -284,8 +280,7 @@ namespace odb
           image_ (image),
           image_version_ (0)
     {
-      if (statement* a = conn_.active ())
-        a->cancel ();
+      conn_.clear ();
 
       if (mysql_stmt_prepare (stmt_, s.c_str (), s.size ()) != 0)
         translate_error (conn_, stmt_);
@@ -294,8 +289,7 @@ namespace odb
     void update_statement::
     execute ()
     {
-      if (statement* a = conn_.active ())
-        a->cancel ();
+      conn_.clear ();
 
       if (mysql_stmt_reset (stmt_))
         translate_error (conn_, stmt_);
@@ -338,8 +332,7 @@ namespace odb
     delete_statement (connection& conn, const string& s, binding& cond)
         : statement (conn), cond_ (cond), cond_version_ (0)
     {
-      if (statement* a = conn_.active ())
-        a->cancel ();
+      conn_.clear ();
 
       if (mysql_stmt_prepare (stmt_, s.c_str (), s.size ()) != 0)
         translate_error (conn_, stmt_);
@@ -348,8 +341,7 @@ namespace odb
     unsigned long long delete_statement::
     execute ()
     {
-      if (statement* a = conn_.active ())
-        a->cancel ();
+      conn_.clear ();
 
       if (mysql_stmt_reset (stmt_))
         translate_error (conn_, stmt_);
diff --git a/odb/mysql/transaction-impl.cxx b/odb/mysql/transaction-impl.cxx
index b523568..659dc56 100644
--- a/odb/mysql/transaction-impl.cxx
+++ b/odb/mysql/transaction-impl.cxx
@@ -6,7 +6,6 @@
 #include <odb/mysql/mysql.hxx>
 #include <odb/mysql/database.hxx>
 #include <odb/mysql/connection.hxx>
-#include <odb/mysql/statement.hxx>
 #include <odb/mysql/error.hxx>
 #include <odb/mysql/transaction-impl.hxx>
 
@@ -30,8 +29,7 @@ namespace odb
     void transaction_impl::
     commit ()
     {
-      if (statement* a = connection_->active ())
-        a->cancel ();
+      connection_->clear ();
 
       if (mysql_real_query (connection_->handle (), "commit", 6) != 0)
         translate_error (*connection_);
@@ -44,8 +42,7 @@ namespace odb
     void transaction_impl::
     rollback ()
     {
-      if (statement* a = connection_->active ())
-        a->cancel ();
+      connection_->clear ();
 
       if (mysql_real_query (connection_->handle (), "rollback", 8) != 0)
         translate_error (*connection_);
-- 
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