85 lines
2.3 KiB
C#
85 lines
2.3 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Text;
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using Marr.Data.Mapping;
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using System.Data.Common;
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namespace Marr.Data
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{
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public class GroupingKeyCollection : IEnumerable<ColumnMap>
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{
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public GroupingKeyCollection()
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{
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PrimaryKeys = new ColumnMapCollection();
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ParentPrimaryKeys = new ColumnMapCollection();
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}
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public ColumnMapCollection PrimaryKeys { get; private set; }
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public ColumnMapCollection ParentPrimaryKeys { get; private set; }
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public int Count
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{
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get
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{
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return PrimaryKeys.Count + ParentPrimaryKeys.Count;
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}
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}
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/// <summary>
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/// Gets the PK values that define this entity in the graph.
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/// </summary>
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internal string GroupingKey { get; private set; }
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/// <summary>
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/// Returns a concatented string containing the primary key values of the current record.
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/// </summary>
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/// <param name="reader">The open data reader.</param>
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/// <returns>Returns the primary key value(s) as a string.</returns>
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internal KeyGroupInfo CreateGroupingKey(DbDataReader reader)
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{
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StringBuilder pkValues = new StringBuilder();
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bool hasNullValue = false;
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foreach (ColumnMap pkColumn in this)
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{
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object pkValue = reader[pkColumn.ColumnInfo.GetColumName(true)];
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if (pkValue == DBNull.Value)
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hasNullValue = true;
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pkValues.Append(pkValue.ToString());
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}
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GroupingKey = pkValues.ToString();
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return new KeyGroupInfo(GroupingKey, hasNullValue);
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}
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#region IEnumerable<ColumnMap> Members
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public IEnumerator<ColumnMap> GetEnumerator()
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{
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foreach (ColumnMap map in ParentPrimaryKeys)
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{
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yield return map;
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}
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foreach (ColumnMap map in PrimaryKeys)
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{
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yield return map;
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}
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}
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#endregion
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#region IEnumerable Members
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System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
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{
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return this.GetEnumerator();
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}
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#endregion
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}
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}
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