added marr.datamapper source code for easy debugging.

Marr.Data/Mapping/MappingHelper.cs

@@ -0,0 +1,185 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Data.Common;
+using Marr.Data.Converters;
+
+namespace Marr.Data.Mapping
+{
+    internal class MappingHelper
+    {
+        private MapRepository _repos;
+        private IDataMapper _db;
+
+        public MappingHelper(IDataMapper db)
+        {
+            _repos = MapRepository.Instance;
+            _db = db;
+        }
+
+        /// <summary>
+        /// Instantiates an entity and loads its mapped fields with the data from the reader.
+        /// </summary>
+        public object CreateAndLoadEntity<T>(ColumnMapCollection mappings, DbDataReader reader, bool useAltName)
+        {
+            return CreateAndLoadEntity(typeof(T), mappings, reader, useAltName);
+        }
+
+        /// <summary>
+        /// Instantiates an entity and loads its mapped fields with the data from the reader.
+        /// </summary>
+        /// <param name="entityType">The entity being created and loaded.</param>
+        /// <param name="mappings">The field mappings for the passed in entity.</param>
+        /// <param name="reader">The open data reader.</param>
+        /// <param name="useAltNames">Determines if the column AltName should be used.</param>
+        /// <returns>Returns an entity loaded with data.</returns>
+        public object CreateAndLoadEntity(Type entityType, ColumnMapCollection mappings, DbDataReader reader, bool useAltName)
+        {
+            // Create new entity
+            object ent = _repos.ReflectionStrategy.CreateInstance(entityType);
+            return LoadExistingEntity(mappings, reader, ent, useAltName);
+        }
+
+        public object LoadExistingEntity(ColumnMapCollection mappings, DbDataReader reader, object ent, bool useAltName)
+        {
+            // Populate entity fields from data reader
+            foreach (ColumnMap dataMap in mappings)
+            {
+                try
+                {
+                    string colName = dataMap.ColumnInfo.GetColumName(useAltName);
+                    int ordinal = reader.GetOrdinal(colName);
+                    object dbValue = reader.GetValue(ordinal);
+
+                    // Handle conversions
+                    IConverter conversion = _repos.GetConverter(dataMap.FieldType);
+                    if (conversion != null)
+                    {
+                        dbValue = conversion.FromDB(dataMap, dbValue);
+                    }
+
+                    _repos.ReflectionStrategy.SetFieldValue(ent, dataMap.FieldName, dbValue);
+                }
+                catch (Exception ex)
+                {
+                    string msg = string.Format("The DataMapper was unable to load the following field: '{0}'.",
+                        dataMap.ColumnInfo.Name);
+
+                    throw new DataMappingException(msg, ex);
+                }
+            }
+
+            PrepareLazyLoadedProperties(ent);
+
+            return ent;
+        }
+
+        private void PrepareLazyLoadedProperties(object ent)
+        {
+            // Handle lazy loaded properties
+            Type entType = ent.GetType();
+            if (_repos.Relationships.ContainsKey(entType))
+            {
+                Func<IDataMapper> dbCreate = () =>
+                {
+                    var db = new DataMapper(_db.ProviderFactory, _db.ConnectionString);
+                    db.SqlMode = SqlModes.Text;
+                    return db;
+                };
+
+                var relationships = _repos.Relationships[entType];
+                foreach (var rel in relationships.Where(r => r.IsLazyLoaded))
+                {
+                    ILazyLoaded lazyLoaded = (ILazyLoaded)rel.LazyLoaded.Clone();
+                    lazyLoaded.Prepare(dbCreate, ent);
+                    _repos.ReflectionStrategy.SetFieldValue(ent, rel.Member.Name, lazyLoaded);
+                }
+            }
+        }
+
+        public T LoadSimpleValueFromFirstColumn<T>(DbDataReader reader)
+        {
+            try
+            {
+                return (T)reader.GetValue(0);
+            }
+            catch (Exception ex)
+            {
+                string firstColumnName = reader.GetName(0);
+                string msg = string.Format("The DataMapper was unable to create a value of type '{0}' from the first column '{1}'.",
+                    typeof(T).Name, firstColumnName);
+
+                throw new DataMappingException(msg, ex);
+            }
+        }
+
+        /// <summary>
+        /// Creates all parameters for a SP based on the mappings of the entity,
+        /// and assigns them values based on the field values of the entity.
+        /// </summary>
+        public void CreateParameters<T>(T entity, ColumnMapCollection columnMapCollection, bool isAutoQuery)
+        {
+            ColumnMapCollection mappings = columnMapCollection;
+
+            if (!isAutoQuery)
+            {
+                // Order columns (applies to Oracle and OleDb only)
+                mappings = columnMapCollection.OrderParameters(_db.Command);
+            }
+
+            foreach (ColumnMap columnMap in mappings)
+            {
+                if (columnMap.ColumnInfo.IsAutoIncrement)
+                    continue;
+
+                var param = _db.Command.CreateParameter();
+                param.ParameterName = columnMap.ColumnInfo.Name;
+                param.Size = columnMap.ColumnInfo.Size;
+                param.Direction = columnMap.ColumnInfo.ParamDirection;
+
+                object val = _repos.ReflectionStrategy.GetFieldValue(entity, columnMap.FieldName);
+
+                param.Value = val == null ? DBNull.Value : val; // Convert nulls to DBNulls
+
+                var repos = MapRepository.Instance;
+
+                IConverter conversion = repos.GetConverter(columnMap.FieldType);
+                if (conversion != null)
+                {
+                    param.Value = conversion.ToDB(param.Value);
+                }
+
+                // Set the appropriate DbType property depending on the parameter type
+                // Note: the columnMap.DBType property was set when the ColumnMap was created
+                repos.DbTypeBuilder.SetDbType(param, columnMap.DBType);
+
+                _db.Command.Parameters.Add(param);
+            }
+        }
+
+        /// <summary>
+        /// Assigns the SP result columns to the passed in 'mappings' fields.
+        /// </summary>
+        public void SetOutputValues<T>(T entity, IEnumerable<ColumnMap> mappings)
+        {
+            foreach (ColumnMap dataMap in mappings)
+            {
+                object output = _db.Command.Parameters[dataMap.ColumnInfo.Name].Value;
+                _repos.ReflectionStrategy.SetFieldValue(entity, dataMap.FieldName, output);
+            }
+        }
+
+        /// <summary>
+        /// Assigns the passed in 'value' to the passed in 'mappings' fields.
+        /// </summary>
+        public void SetOutputValues<T>(T entity, IEnumerable<ColumnMap> mappings, object value)
+        {
+            foreach (ColumnMap dataMap in mappings)
+            {
+                _repos.ReflectionStrategy.SetFieldValue(entity, dataMap.FieldName, Convert.ChangeType(value, dataMap.FieldType));
+            }
+        }
+
+    }
+}