From bcf5fce175953bec0fd2725968828850a74d8539 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Mon, 7 Nov 2011 15:00:06 +0200
Subject: Add support for SQL statement tracing

---
 odb/connection.hxx | 31 ++++++++++++++++++++++++++++++-
 1 file changed, 30 insertions(+), 1 deletion(-)

(limited to 'odb/connection.hxx')

diff --git a/odb/connection.hxx b/odb/connection.hxx
index db8635c..fdf5036 100644
--- a/odb/connection.hxx
+++ b/odb/connection.hxx
@@ -51,6 +51,30 @@ namespace odb
     virtual unsigned long long
     execute (const char* statement, std::size_t length) = 0;
 
+    // SQL statement tracing.
+    //
+  public:
+    typedef odb::tracer tracer_type;
+
+    void
+    tracer (tracer_type&);
+
+    void
+    tracer (tracer_type*);
+
+    tracer_type*
+    tracer () const;
+
+   public:
+    // Store the transaction-spacific tracer in the connection. If we
+    // were to store it in the transaction, then in order to check if
+    // it was set, we would need to get the transaction instance using
+    // the current() API. But that requires a TLS lookup, which can be
+    // slow.
+    //
+    tracer_type*
+    transaction_tracer () const;
+
   public:
     virtual
     ~connection ();
@@ -62,8 +86,13 @@ namespace odb
     connection (const connection&);
     connection& operator= (const connection&);
 
-  private:
+  protected:
     database_type& database_;
+    tracer_type* tracer_;
+
+  protected:
+    friend class transaction;
+    tracer_type* transaction_tracer_;
   };
 }
 
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