DbLib: Fixes for MySQL ODBC driver

SQLSetConnectAttr crashes for this driver, and SQLSetStmtAttr is the ODBC3 way anyway.

common/database/database_connection.cpp

@@ -449,11 +449,11 @@ bool DATABASE_CONNECTION::SelectAll( const std::string& aTable, std::vector<ROW>
         return false;
     }
 
-    if( !results.first() )
-        return false;
-
     try
     {
+        if( !results.first() )
+            return false;
+
         do
         {
             ROW result;

thirdparty/nanodbc/nanodbc/nanodbc.cpp

@@ -995,15 +995,6 @@ public:
         if (!success(rc) && (event_handle == nullptr || rc != SQL_STILL_EXECUTING))
             NANODBC_THROW_DATABASE_ERROR(dbc_, SQL_HANDLE_DBC);
 
-        int cursorType = SQL_CURSOR_KEYSET_DRIVEN;
-        NANODBC_CALL_RC(
-                SQLSetConnectAttr,
-                rc,
-                dbc_,
-                SQL_ATTR_CURSOR_TYPE,
-                (SQLPOINTER)(std::intptr_t)cursorType,
-                0);
-
         connected_ = success(rc);
 
         return rc;
@@ -1054,15 +1045,6 @@ public:
         if (!success(rc) && (event_handle == nullptr || rc != SQL_STILL_EXECUTING))
             NANODBC_THROW_DATABASE_ERROR(dbc_, SQL_HANDLE_DBC);
 
-        int cursorType = SQL_CURSOR_KEYSET_DRIVEN;
-        NANODBC_CALL_RC(
-                SQLSetConnectAttr,
-                rc,
-                dbc_,
-                SQL_ATTR_CURSOR_TYPE,
-                (SQLPOINTER)(std::intptr_t)cursorType,
-                0);
-
         connected_ = success(rc);
 
         return rc;
@@ -1452,6 +1434,18 @@ public:
 #endif
 
         RETCODE rc;
+
+        int cursorType = SQL_CURSOR_KEYSET_DRIVEN;
+        NANODBC_CALL_RC(
+                SQLSetStmtAttr,
+                rc,
+                stmt_,
+                SQL_ATTR_CURSOR_TYPE,
+                (SQLPOINTER)(std::intptr_t)cursorType,
+                0);
+        if (!success(rc) && rc != SQL_STILL_EXECUTING)
+            NANODBC_THROW_DATABASE_ERROR(stmt_, SQL_HANDLE_STMT);
+
         NANODBC_CALL_RC(
             NANODBC_FUNC(SQLPrepare),
             rc,