[hyena/sqlite] [Hyena.Data.Sqlite] Ensure statement is readable

[Gabriel Burt <gburt src gnome org>]

commit 3d1cee6dee0a13247d74473c2d9e06ae6230c48e
Author: Gabriel Burt <gabriel burt gmail com>
Date:   Wed Nov 10 20:53:01 2010 -0600

    [Hyena.Data.Sqlite] Ensure statement is readable

 Hyena.Data.Sqlite/Hyena.Data.Sqlite/Sqlite.cs |   15 +++++++++++++--
 1 files changed, 13 insertions(+), 2 deletions(-)
---
diff --git a/Hyena.Data.Sqlite/Hyena.Data.Sqlite/Sqlite.cs b/Hyena.Data.Sqlite/Hyena.Data.Sqlite/Sqlite.cs
index f0f88a6..19adbbd 100644
--- a/Hyena.Data.Sqlite/Hyena.Data.Sqlite/Sqlite.cs
+++ b/Hyena.Data.Sqlite/Hyena.Data.Sqlite/Sqlite.cs
@@ -163,6 +163,7 @@ namespace Hyena.Data.Sqlite
         QueryReader reader;
         bool disposed;
 
+        internal bool Reading { get; set; }
         internal IntPtr Ptr { get { return ptr; } }
         internal bool Bound { get { return bound; } }
         internal Connection Connection { get { return connection; } }
@@ -196,6 +197,13 @@ namespace Hyena.Data.Sqlite
             reader = new QueryReader () { Statement = this };
         }
 
+        internal void CheckReading ()
+        {
+            CheckDisposed ();
+            if (!Reading)
+                throw new InvalidOperationException ("Statement is not readable");
+        }
+
         internal void CheckDisposed ()
         {
             if (disposed)
@@ -278,6 +286,7 @@ namespace Hyena.Data.Sqlite
         private void Reset ()
         {
             CheckError (Native.sqlite3_reset (ptr));
+            Reading = false;
         }
 
         public IEnumerator<IDataReader> GetEnumerator ()
@@ -349,8 +358,10 @@ namespace Hyena.Data.Sqlite
 
             int code = Native.sqlite3_step (Ptr);
             if (code == ROW) {
+                Statement.Reading = true;
                 return true;
             } else {
+                Statement.Reading = false;
                 Statement.CheckError (code);
                 return false;
             }
@@ -358,7 +369,7 @@ namespace Hyena.Data.Sqlite
 
         public object this[int i] {
             get {
-                Statement.CheckDisposed ();
+                Statement.CheckReading ();
                 int type = Native.sqlite3_column_type (Ptr, i);
                 switch (type) {
                     case SQLITE_INTEGER:
@@ -379,7 +390,7 @@ namespace Hyena.Data.Sqlite
 
         public object this[string columnName] {
             get {
-                Statement.CheckDisposed ();
+                Statement.CheckReading ();
                 if (columns == null) {
                     columns = new Dictionary<string, int> ();
                     for (int i = 0; i < FieldCount; i++) {