Add project files.

SaxoniteStandardDbas/Dbas/Data/SaxDbDataItem.cs

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+using Sarand.Net.Standard.Dbas.Data;
+using Sarand.Net.Standard.Base.Core;
+using Sarand.Net.Standard.Base.Dbas;
+using System;
+using System.Collections.Generic;
+using System.Text;
+using Sarand.Net.Standard.Base.Utils;
+
+namespace Saxonite.Net.Standard.Dbas.Data
+{
+	//=======================================================================
+	public abstract class SaxDbDataItem : DbDataItem
+	{
+		//-------------------------------------------------------------------
+		// Definitions.
+		/// <summary>
+		/// Database information - object supplied by main application.
+		/// <para>NB Application may have multiple databases with schema differences.</para>
+		/// <para>Each instance of a DbDataItem must be database specific.</para>
+		/// </summary>
+		public class SlmDatabaseInfo : IDatabaseInfo
+		{
+			// Data members.
+			private readonly List<DbDfnTable> tables;
+			private static readonly String defaultSchemaName = "dbo";
+			// Construction.
+			public SlmDatabaseInfo(String databaseName, List<DbDfnTable> tables)
+			{
+				this.DatabaseName = databaseName;
+				this.tables = tables;
+			}
+			// Properties.
+			public String DatabaseName { get; }
+			public String Context { get { return StringUtil.OnEmpty(DatabaseName, "UnknownDb"); } }
+			// Database schema.
+			public DbDfnTable GetTableDefinition(String schemaName, String tableName)
+			{
+				foreach (DbDfnTable table in tables.FindAll(item => item.Name.EqualsCI(tableName)))
+				{
+					if (StringUtil.OnEmpty(table.Schema, defaultSchemaName).EqualsCI(StringUtil.OnEmpty(schemaName, defaultSchemaName)))
+						return table;
+				}
+				return null;
+			}
+			public bool TableExists(String schemaName, String tableName)
+			{
+				return GetTableDefinition(schemaName, tableName) != null;
+			}
+			public bool ColumnExists(String schemaName, String tableName, String columnName)
+			{
+				DbDfnTable table = GetTableDefinition(schemaName, tableName);
+				if (table == null) return false;
+				return table.HasColumnByName(columnName);
+			}
+			public List<DbDfnColumn> GetColumnsForTable(String schemaName, String tableName)
+			{
+				DbDfnTable table = GetTableDefinition(schemaName, tableName);
+				if (table != null) return table.Columns;
+				return new List<DbDfnColumn>();
+			}
+		}
+
+		//-------------------------------------------------------------------
+		// Construction.
+		protected SaxDbDataItem(IDatabaseInfo dbInfo) : base(dbInfo)
+		{
+		}
+
+		//-------------------------------------------------------------------
+
+		//-------------------------------------------------------------------
+	}
+	//=======================================================================
+}