Add support for native SQL statement execution

New test: mysql/native. New manual section: 3.9, "Executing Native SQL
Statements".

2 files changed, 48 insertions, 3 deletions

diff --git a/odb/mysql/database.cxx b/odb/mysql/database.cxx
index 88899b5..da19ab5 100644
--- a/odb/mysql/database.cxx
+++ b/odb/mysql/database.cxx
@@ -5,9 +5,10 @@
 
 #include <sstream>
 
-#include <odb/transaction.hxx>
-
+#include <odb/mysql/mysql.hxx>
 #include <odb/mysql/database.hxx>
+#include <odb/mysql/transaction.hxx>
+#include <odb/mysql/connection.hxx>
 #include <odb/mysql/connection-factory.hxx>
 #include <odb/mysql/exceptions.hxx>
 
@@ -209,10 +210,50 @@ namespace odb
       details::options::print_usage (os);
     }
 
+    unsigned long long database::
+    execute (const char* s, std::size_t n)
+    {
+      if (!transaction::has_current ())
+        throw not_in_transaction ();
+
+      connection_type& c (transaction::current ().connection ());
+      MYSQL* h (c.handle ());
+
+      if (mysql_real_query (h, s, static_cast<unsigned long> (n)))
+      {
+        unsigned int e (mysql_errno (h));
+
+        if (e == ER_LOCK_DEADLOCK)
+          throw deadlock ();
+        else
+          throw database_exception (h);
+      }
+
+      // Get the affected row count, if any. If the statement has a result
+      // set (e.g., SELECT), we first need to call mysql_store_result().
+      //
+      unsigned long long r (0);
+
+      if (mysql_field_count (h) == 0)
+        r = static_cast<unsigned long long> (mysql_affected_rows (h));
+      else
+      {
+        if (MYSQL_RES* rs = mysql_store_result (h))
+        {
+          r = static_cast<unsigned long long> (mysql_num_rows (rs));
+          mysql_free_result (rs);
+        }
+        else
+          throw database_exception (h);
+      }
+
+      return r;
+    }
+
     transaction_impl* database::
     begin ()
     {
-      if (odb::transaction::has_current ())
+      if (transaction::has_current ())
         throw already_in_transaction ();
 
       return new transaction_impl (*this);
diff --git a/odb/mysql/database.hxx b/odb/mysql/database.hxx
index 6449d23..81f2892 100644
--- a/odb/mysql/database.hxx
+++ b/odb/mysql/database.hxx
@@ -159,6 +159,10 @@ namespace odb
       }
 
     public:
+      virtual unsigned long long
+      execute (const char* statement, std::size_t length);
+
+    public:
       virtual transaction_impl*
       begin ();