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//
// System.Data.SqlClient.DbEnumerator.cs
//
// Author:
// Tim Coleman (tim@timcoleman.com)
//
// Copyright (C) Tim Coleman, 2002
//
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
namespace System.Data.Common {
public class DbEnumerator : IEnumerator
{
#region Fields
IDataReader reader;
bool closeReader;
SchemaInfo[] schema;
FieldNameLookup lookup;
int fieldCount;
#endregion // Fields
#region Constructors
public DbEnumerator (IDataReader reader)
: this (reader, false)
{
}
public DbEnumerator (IDataReader reader, bool closeReader)
{
this.reader = reader;
this.closeReader = closeReader;
this.lookup = new FieldNameLookup ();
this.fieldCount = reader.FieldCount;
LoadSchema (reader.GetSchemaTable ());
}
#endregion // Constructors
#region Properties
public object Current {
get {
object[] values = new object[fieldCount];
reader.GetValues (values);
return new DbDataRecord (schema, values, lookup);
}
}
#endregion // Properties
#region Methods
private void LoadSchema (DataTable schemaTable)
{
schema = new SchemaInfo [fieldCount];
int index = 0;
foreach (DataRow row in schemaTable.Rows) {
SchemaInfo columnSchema = new SchemaInfo ();
lookup.Add ((string) row["ColumnName"]);
columnSchema.AllowDBNull = (bool) row ["AllowDBNull"];
columnSchema.ColumnName = row ["ColumnName"].ToString ();
columnSchema.ColumnOrdinal = (int) row ["ColumnOrdinal"];
columnSchema.ColumnSize = (int) row ["ColumnSize"];
columnSchema.DataTypeName = reader.GetDataTypeName (index);
columnSchema.FieldType = reader.GetFieldType (index);
columnSchema.IsReadOnly = (bool) row ["IsReadOnly"];
columnSchema.TableName = row ["BaseTableName"].ToString ();
if (row ["NumericPrecision"] != DBNull.Value)
columnSchema.NumericPrecision = Convert.ToByte (row ["NumericPrecision"]);
else
columnSchema.NumericPrecision = Convert.ToByte (0);
if (row ["NumericScale"] != DBNull.Value)
columnSchema.NumericScale = Convert.ToByte (row ["NumericScale"]);
else
columnSchema.NumericScale = Convert.ToByte (0);
schema [index] = columnSchema;
index += 1;
}
}
public bool MoveNext ()
{
if (reader.Read ())
return true;
if (closeReader)
reader.Close ();
return false;
}
[EditorBrowsable (EditorBrowsableState.Never)]
public void Reset ()
{
throw new NotSupportedException ();
}
#endregion // Methods
}
}
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