public void ResetDbType()
{
NpgsqlParameter p;
//Parameter with an assigned value but no DbType specified
p = new NpgsqlParameter("foo", 42);
p.ResetDbType();
Assert.AreEqual(DbType.Int32, p.DbType, "#A:DbType");
Assert.AreEqual(NpgsqlDbType.Integer, p.NpgsqlDbType, "#A:NpgsqlDbType");
Assert.AreEqual(42, p.Value, "#A:Value");
p.DbType = DbType.DateTime; //assigning a DbType
Assert.AreEqual(DbType.DateTime, p.DbType, "#B:DbType1");
Assert.AreEqual(NpgsqlDbType.Timestamp, p.NpgsqlDbType, "#B:SqlDbType1");
p.ResetDbType();
Assert.AreEqual(DbType.Int32, p.DbType, "#B:DbType2");
Assert.AreEqual(NpgsqlDbType.Integer, p.NpgsqlDbType, "#B:SqlDbtype2");
//Parameter with an assigned NpgsqlDbType but no specified value
p = new NpgsqlParameter("foo", NpgsqlDbType.Integer);
p.ResetDbType();
Assert.AreEqual(DbType.String, p.DbType, "#C:DbType");
Assert.AreEqual(NpgsqlDbType.Text, p.NpgsqlDbType, "#C:NpgsqlDbType");
p.DbType = DbType.DateTime; //assigning a NpgsqlDbType
Assert.AreEqual(DbType.DateTime, p.DbType, "#D:DbType1");
Assert.AreEqual(NpgsqlDbType.Timestamp, p.NpgsqlDbType, "#D:SqlDbType1");
p.ResetDbType();
Assert.AreEqual(DbType.String, p.DbType, "#D:DbType2");
Assert.AreEqual(NpgsqlDbType.Text, p.NpgsqlDbType, "#D:SqlDbType2");
p = new NpgsqlParameter();
p.Value = DateTime.MaxValue;
Assert.AreEqual(DbType.DateTime, p.DbType, "#E:DbType1");
Assert.AreEqual(NpgsqlDbType.Timestamp, p.NpgsqlDbType, "#E:SqlDbType1");
p.Value = null;
p.ResetDbType();
Assert.AreEqual(DbType.String, p.DbType, "#E:DbType2");
Assert.AreEqual(NpgsqlDbType.Text, p.NpgsqlDbType, "#E:SqlDbType2");
p = new NpgsqlParameter("foo", NpgsqlDbType.Varchar);
p.Value = DateTime.MaxValue;
p.ResetDbType();
Assert.AreEqual(DbType.DateTime, p.DbType, "#F:DbType");
Assert.AreEqual(NpgsqlDbType.Timestamp, p.NpgsqlDbType, "#F:NpgsqlDbType");
Assert.AreEqual(DateTime.MaxValue, p.Value, "#F:Value");
p = new NpgsqlParameter("foo", NpgsqlDbType.Varchar);
p.Value = DBNull.Value;
p.ResetDbType();
Assert.AreEqual(DbType.String, p.DbType, "#G:DbType");
Assert.AreEqual(NpgsqlDbType.Text, p.NpgsqlDbType, "#G:NpgsqlDbType");
Assert.AreEqual(DBNull.Value, p.Value, "#G:Value");
p = new NpgsqlParameter("foo", NpgsqlDbType.Varchar);
p.Value = null;
p.ResetDbType();
Assert.AreEqual(DbType.String, p.DbType, "#G:DbType");
Assert.AreEqual(NpgsqlDbType.Text, p.NpgsqlDbType, "#G:NpgsqlDbType");
Assert.IsNull(p.Value, "#G:Value");
}
