///<summary>
/// Sets value of the specified <see cref="ResultProperty"/> on the target object
/// when a 'select' attribute exists and fills an <see cref="IList"/> property
/// on the <see cref="ResultProperty"/> are empties.
/// </summary>
/// <param name="request">The request.</param>
/// <param name="resultMap">The result map.</param>
/// <param name="mapping">The ResultProperty.</param>
/// <param name="target">The target.</param>
/// <param name="reader">The current <see cref="IDataReader"/></param>
/// <param name="keys">The keys</param>
public void Set(RequestScope request, IResultMap resultMap,
ResultProperty mapping, ref object target, IDataReader reader, object keys)
{
// Get the select statement
IMappedStatement selectStatement = request.MappedStatement.ModelStore.GetMappedStatement(mapping.Select);
PostBindind postSelect = new PostBindind();
postSelect.Statement = selectStatement;
postSelect.Keys = keys;
postSelect.Target = target;
postSelect.ResultProperty = mapping;
if (mapping.IsLazyLoad)
{
object values = mapping.LazyFactory.CreateProxy(request.MappedStatement.ModelStore.DataMapper, selectStatement, keys, target, mapping.SetAccessor);
//为target类的mapping属性设置值为values
mapping.Set(target, values);
}
else
{
if (mapping.SetAccessor.MemberType.GetGenericTypeDefinition() == typeof(IList<>))
{
postSelect.Method = PostBindind.ExecuteMethod.ExecuteQueryForGenericIList;
}
//将postSelect类对象添加到队列中
request.DelayedLoad.Enqueue(postSelect);
}
}
///<summary>
/// Sets value of the specified <see cref="ResultProperty"/> on the target object
/// when a 'select' attribute exists and fills an object property.
/// on the <see cref="ResultProperty"/> are empties.
/// </summary>
/// <param name="request">The request.</param>
/// <param name="resultMap">The result map.</param>
/// <param name="mapping">The ResultProperty.</param>
/// <param name="target">The target.</param>
/// <param name="reader">The current <see cref="IDataReader"/></param>
/// <param name="keys">The keys</param>
public void Set(RequestScope request, IResultMap resultMap,
ResultProperty mapping, ref object target, IDataReader reader, object keys)
{
// Get the select statement
IMappedStatement selectStatement = request.MappedStatement.ModelStore.GetMappedStatement(mapping.Select);
PostBindind postSelect = new PostBindind();
postSelect.Statement = selectStatement;
postSelect.Keys = keys;
postSelect.Target = target;
postSelect.ResultProperty = mapping;
if (mapping.IsLazyLoad)
{
object values = mapping.LazyFactory.CreateProxy(
request.MappedStatement.ModelStore.DataMapper,
selectStatement, keys, target, mapping.SetAccessor);
mapping.Set(target, values);
}
else
{
postSelect.Method = PostBindind.ExecuteMethod.ExecuteQueryForObject;
request.DelayedLoad.Enqueue(postSelect);
}
}
/// <summary>
/// Gets the value of the specified <see cref="ResultProperty"/> that must be set on the target object.
/// </summary>
/// <param name="request">The request.</param>
/// <param name="resultMap">The result map.</param>
/// <param name="mapping">The mapping.</param>
/// <param name="reader">The reader.</param>
/// <param name="target">The target object</param>
public object Get(RequestScope request, IResultMap resultMap, ResultProperty mapping, ref object target, IDataReader reader)
{
// The property is a IList
IList list = null;
// Get the IList property 获取target类属性mapping.PropertyName的值
object property = ObjectProbe.GetMemberValue(target, mapping.PropertyName,
request.DataExchangeFactory.AccessorFactory);
if (property == null)// Create the list if need
{
property = mapping.ListFactory.CreateInstance(null);
mapping.Set(target, property);
}
list = (IList)property;
object result = null;
//返回的结果中包含其他类对象的情况
IResultMap propertyRresultMap = mapping.NestedResultMap.ResolveSubMap(reader);
if (propertyRresultMap.GroupByProperties.Count > 0)
{
string uniqueKey = GetUniqueKey(propertyRresultMap, reader);
// Gets the [key, result object] already build
IDictionary<string, object> buildObjects = request.GetUniqueKeys(propertyRresultMap);
if (buildObjects != null && buildObjects.ContainsKey(uniqueKey))
{
// Unique key is already known, so get the existing result object and process additional results.
result = buildObjects[uniqueKey];
//In some cases (nested groupings) our object may be null, so there is
//no point in going on
if (result != null)
{
// process resulMapping attribute which point to a groupBy attribute
for (int index = 0; index < propertyRresultMap.Properties.Count; index++)
{
ResultProperty resultProperty = propertyRresultMap.Properties[index];
if (resultProperty.PropertyStrategy is GroupByStrategy)
{
// 跳到PropertyStrategy中的类
resultProperty.PropertyStrategy.Set(request, propertyRresultMap, resultProperty, ref result, reader, null);
}
}
}
result = SKIP;
}
else if (uniqueKey == null || buildObjects == null || !buildObjects.ContainsKey(uniqueKey))
{
// Unique key is NOT known, so create a new result object and then process additional results.
//在ResultMapStrategy类中实现对target类mapping属性的赋值
result = resultMapStrategy.Get(request, resultMap, mapping, ref target, reader);
if (buildObjects == null)
{
buildObjects = new Dictionary<string, object>();
request.SetUniqueKeys(propertyRresultMap, buildObjects);
}
buildObjects[uniqueKey] = result;
}
}
else // Last resultMap have no groupBy attribute
{
if (propertyRresultMap.KeyPropertyNames.Count > 0)
{
result = circularResultMapStrategy.Get(request, resultMap, mapping, ref target, reader);
}
else
{
//在ResultMapStrategy类中实现对target类mapping属性的赋值
result = resultMapStrategy.Get(request, resultMap, mapping, ref target, reader);
}
}
if ((result != null) && (result != SKIP))
{
list.Add(result);
}
return result;
}
///<summary>
/// Sets value of the specified <see cref="ResultProperty"/> on the target object
/// when a 'select' attribute exists
/// on the <see cref="ResultProperty"/> are empties.
/// </summary>
/// <param name="request">The request.</param>
/// <param name="resultMap">The result map.</param>
/// <param name="mapping">The ResultProperty.</param>
/// <param name="target">The target.</param>
/// <param name="reader">The reader.</param>
/// <param name="selectKeys">The keys</param>
public void Set(RequestScope request, IResultMap resultMap,
ResultProperty mapping, ref object target, IDataReader reader, object selectKeys)
{
string paramString = mapping.ColumnName;
object keys = null;
bool wasNull = false;
#region Finds the select keys.
if (paramString.IndexOf(',')>0 || paramString.IndexOf('=')>0) // composite parameters key
{
IDictionary keyMap = new Hashtable();
keys = keyMap;
// define which character is seperating fields
char[] splitter = {'=',','};
string[] paramTab = paramString.Split(splitter);
if (paramTab.Length % 2 != 0)
{
throw new DataMapperException("Invalid composite key string format in '"+mapping.PropertyName+". It must be: property1=column1,property2=column2,...");
}
IEnumerator enumerator = paramTab.GetEnumerator();
while (!wasNull && enumerator.MoveNext())
{
string hashKey = ((string)enumerator.Current).Trim();
if (paramString.Contains("="))// old 1.x style multiple params
{
enumerator.MoveNext();
}
object hashValue = reader.GetValue(reader.GetOrdinal(((string)enumerator.Current).Trim()));
keyMap.Add(hashKey, hashValue );
wasNull = (hashValue == DBNull.Value);
}
}
else // single parameter key
{
keys = reader.GetValue(reader.GetOrdinal(paramString));
wasNull = reader.IsDBNull(reader.GetOrdinal(paramString));
}
#endregion
if (wasNull)
{
// set the value of an object property to null
mapping.Set(target, null);
}
else // Collection object or .Net object
{
selectStrategy.Set(request, resultMap, mapping, ref target, reader, keys);
}
}
/// <summary>
/// Sets the value to the result property.
/// </summary>
/// <param name="mapping"></param>
/// <param name="target"></param>
/// <param name="dataBaseValue"></param>
public override void SetData(ref object target, ResultProperty mapping, object dataBaseValue)
{
Type targetType = target.GetType();
if ((targetType != parameterClass)
&& !targetType.IsSubclassOf(parameterClass)
&& !parameterClass.IsAssignableFrom(targetType))
{
throw new ArgumentException("Could not set value in class '" + target.GetType() + "' for property '" + mapping.PropertyName + "' of type '" + mapping.MemberType + "'");
}
if ( mapping.IsComplexMemberName)
{
ObjectProbe.SetMemberValue(target, mapping.PropertyName, dataBaseValue,
DataExchangeFactory.ObjectFactory,
DataExchangeFactory.AccessorFactory);
}
else
{
mapping.Set(target, dataBaseValue);
}
}