/// <summary>
/// Executes a db command and fills in a list of objects with the result data
/// </summary>
/// <typeparam name="ReturnType">The type of object to return</typeparam>
/// <param name="objectType">The type of object to return.</param>
/// <param name="command">The command to execute</param>
/// <returns></returns>
protected virtual IEnumerable <ReturnType> ExecuteCommandLoadList <ReturnType>(Type objectType, IDbCommand command)
{
DatabaseTypeInfo ti = TypeInformationParser.GetTypeInfo(objectType);
using (IQueryData dt = ExecuteCommands.ExecuteCommandQuery(command, Connection))
{
if (dt.QuerySuccessful)
{
foreach (IQueryRow row in dt)
{
ReturnType toAdd;
if (objectType.IsSystemType())
{
toAdd = (ReturnType)Connection.CLRConverter.ConvertToType(row.GetDataForRowField(0), typeof(ReturnType));
}
else
{
toAdd = (ReturnType)BuildObject(row, ti);
}
yield return(toAdd);
}
}
}
}
/// <summary>
/// This function will return an IQueryable appropriate for using with LINQ
/// </summary>
/// <typeparam name="T">The type to query</typeparam>
/// <returns></returns>
public virtual IQueryable <T> Query <T>()
{
IQueryable <T> toReturn = new Query <T>(Connection.GetQueryProvider(this));
DatabaseTypeInfo ti = TypeInformationParser.GetTypeInfo(typeof(T));
if (ti.QueryPredicate != null)
{
toReturn = ti.QueryPredicate.Invoke(toReturn);
}
return(toReturn);
}
/// <summary>
/// Returns the key value for an object
/// </summary>
/// <param name="type">The type to check</param>
/// <param name="item">The object to extract from</param>
/// <returns></returns>
public virtual object GetKeyForItemType(Type type, object item)
{
IEnumerable <DataFieldInfo> fields = TypeInformationParser.GetPrimaryKeys(type);
if (fields.Count() > 1)
{
throw new DataStoreException("This Type contains more than one key");
}
if (fields.Count() < 1)
{
throw new DataStoreException("This type does not contain a key");
}
return(fields.ElementAt(0).Getter(item));
}
public async Task <IQueryable <T> > Query <T>()
{
var tTask = Task.Run(() => TypeInformationParser.GetTypeInfo(typeof(T)));
var rTask = Task.Run(() => new Query <T>(Connection.GetQueryProvider(_dstore)));
DatabaseTypeInfo ti = await tTask;
IQueryable <T> toReturn = await rTask;
if (ti.QueryPredicate != null)
{
toReturn = ti.QueryPredicate.Invoke(toReturn);
}
return(toReturn);
}
protected async Task <bool> ProcessCommandAsync(object item, IDbCommand command, bool FailIfNoRecords = false)
{
return(await ProcessCommandAsync(r =>
{
var en = r.GetQueryEnumerator();
if (en.MoveNext())
{
var task = SetFieldDataAsync(TypeInformationParser.GetTypeInfo(item.GetType()), en.Current, item);
return true;
}
else
{
return false;
}
}, command, FailIfNoRecords));
}
/// <summary>
/// Executes a db command and fills in the object, if needed i.e. primary keys on insert etc
/// </summary>
/// <param name="item">The item being queried with</param>
/// <param name="command">The db command</param>
/// <param name="FailIfNoRecords">if set to <c>true</c> and there is no records in the result set, no further processing will be done</param>
/// <returns></returns>
protected virtual bool ProcessCommand(object item, IDbCommand command, bool FailIfNoRecords)
{
return(ProcessCommand(r =>
{
var en = r.GetQueryEnumerator();
if (en.MoveNext())
{
SetFieldData(TypeInformationParser.GetTypeInfo(item.GetType()), en.Current, item);
return true;
}
else
{
return false;
}
}, command, FailIfNoRecords));
}
/// <summary>
/// Loads an object.
/// </summary>
/// <param name="item">The type to load.</param>
/// <param name="key">The primary field</param>
/// <returns></returns>
public virtual object LoadObject(Type item, object key)
{
DatabaseTypeInfo ti = TypeInformationParser.GetTypeInfo(item);
if (ti.PrimaryKeys.Count == 1)
{
object toReturn = CreateObjectSetKey(item, key, ti);
if (!LoadObject(toReturn))
{
toReturn = null;
}
return(toReturn);
}
else
{
throw new DataStoreException("This method is only valid when the item contains (1) key");
}
}
public async Task <object> LoadObject(Type item, object key, bool LoadAllFields = false)
{
DatabaseTypeInfo ti = TypeInformationParser.GetTypeInfo(item);
if (ti.PrimaryKeys.Count == 1)
{
object toReturn = CreateObjectSetKey(item, key, ti);
if (!await LoadObject(toReturn, LoadAllFields))
{
toReturn = null;
}
return(toReturn);
}
else
{
throw new DataStoreException("This method is only valid when the item contains (1) key");
}
}
/// <summary>
/// Executes a db command and fills in a list of objects when done, if needed i.e. primary keys on insert etc
/// </summary>
/// <param name="items">The items.</param>
/// <param name="command">The db command</param>
/// <param name="FailIfNoRecords">if set to <c>true</c> and there is no records in the result set, no further processing will be done</param>
/// <returns></returns>
protected virtual bool ProcessCommand(IList items, IDbCommand command, bool FailIfNoRecords)
{
return(ProcessCommand(dt =>
{
if (items.Count > 0)
{
Type t = items[0].GetType();
IEnumerator <IQueryRow> rows = dt.GetQueryEnumerator();
for (int i = 0; i < items.Count; i++)
{
rows.MoveNext();
SetFieldData(TypeInformationParser.GetTypeInfo(t), rows.Current, items[i]);
}
return true;
}
return false;
}, command, FailIfNoRecords));
}
public override bool InsertObject(object item)
{
DatabaseTypeInfo ti = TypeInformationParser.GetTypeInfo(item.GetType());
EventHandler <CommandExecutingEventArgs> inserting = (sender, e) =>
{
if (ti.PrimaryKeys.Count == 1)
{
SqlCeCommand cmd = new SqlCeCommand("SELECT @@Identity;");
cmd.Connection = (SqlCeConnection)e.RawConnection;
object data = cmd.ExecuteScalar();
ti.PrimaryKeys[0].Setter(item, Connection.CLRConverter.ConvertToType(data, ti.PrimaryKeys[0].PropertyType));
}
};
this.ExecuteCommands.CommandExecuted += inserting;
bool result = base.InsertObject(item);
this.ExecuteCommands.CommandExecuted -= inserting;
return(result);
}
public async Task <IEnumerable <ReturnType> > ExecuteCommandLoadList <ReturnType>(Type objectType, IDbCommand command)
{
List <ReturnType> toReturn = new List <ReturnType>();
using (IQueryData dt = await Task.Run(() => ExecuteCommands.ExecuteCommandQuery(command, Connection)))
{
if (dt.QuerySuccessful)
{
DatabaseTypeInfo ti = TypeInformationParser.GetTypeInfo(objectType);
foreach (IQueryRow row in dt)
{
if (objectType.IsSystemType())
{
toReturn.Add((ReturnType)Connection.CLRConverter.ConvertToType(row.GetDataForRowField(0), typeof(ReturnType)));
}
else
{
toReturn.Add((ReturnType)await BuildObjectAsync(row, ti));
}
}
}
return(toReturn);
}
}
/// <summary>
/// Creates an object and inits the primary key field
/// </summary>
/// <param name="item">The item.</param>
/// <param name="key">The key.</param>
/// <returns></returns>
protected virtual object CreateObjectSetKey(Type item, object key)
{
return(CreateObjectSetKey(item, key, TypeInformationParser.GetTypeInfo(item)));
}
