// The only purpose of this method is to give the client more accurate information about the target property
// which caused the InvalidCastException exception. This method may even fail with inner exception and/or return null,
// and in that case the less accurate InvalidCastException info will be shown to the client.
internal static Row <string, string, string> AnalyseInvalidCastException(Connectable connectable, Type type, int tableIndex)
{
try
{
using (SqlConnection cn = new SqlConnection(connectable.ConnectionString))
{
cn.Open();
Importer.ExecuteBulkInsert(connectable, cn);
using (SqlCommand cmd = new SqlCommand(connectable.Sql, cn))
{
cmd.CommandTimeout = connectable.CommandTimeout;
int i = 0;
using (SqlDataReader reader = cmd.ExecuteReader())
{
while (i++ != tableIndex)
{
if (!reader.NextResult())
{
return(null);
}
}
DataTable schema = reader.GetSchemaTable();
int hash = GetLoaderHash(reader);
var cacheKey = Cache.CreateLoaderCacheKey(hash, type);
Cache.LoaderCacheValue cacheValue;
if (!Cache.Loaders.TryGetValue(cacheKey, out cacheValue))
{
return(null); // do not continue with analysis if cache does not exist (not likely)
}
int j = 0;
foreach (var column in cacheValue.Columns)
{
DataRow row;
if (Row.IsRow(type))
{
row = schema.Rows[j++];
}
else
{
row = schema.AsEnumerable()
.Where(a => a.Field <string>(_columnNameText).EqualsCS(column.ColumnName))
.Select(a => a)
.FirstOrDefault();
}
if (row != null)
{
string sqlTypeName = row.Field <string>(_dataTypeNameText);
var clrInfo = Mapping.ClrMapping[column.ValueType];
bool ismatch = false;
foreach (var dbtype in clrInfo.DTypes)
{
if (Mapping.SqlMapping[dbtype].SqlPlain.EqualsCS(sqlTypeName, false))
{
ismatch = true;
break;
}
}
if (!ismatch)
{
return(Row.Create(column.ColumnName, column.ValueType.ToString(), sqlTypeName));
}
}
}
}
}
}
}
// safe: the "real" exception has already been caught
catch { }
return(null);
}
private static void _LoadTableSetBody(
Connectable connectable,
Func <IDataReader, TableSetLoaderArgs> tableSetLoader,
Type currentTableType,
out int returnValue)
{
int tableIndex = 0;
try
{
using (SqlConnection cn = new SqlConnection(connectable.ConnectionString))
{
cn.Open();
Importer.ExecuteBulkInsert(connectable, cn);
using (SqlCommand cmd = new SqlCommand(connectable.Sql, cn))
{
cmd.CommandTimeout = connectable.CommandTimeout;
SqlDataReader reader = cmd.ExecuteReader();
try
{
var loaderException = tableSetLoader(reader);
if (loaderException != null)
{
currentTableType = loaderException.TableType;
tableIndex = loaderException.TableIndex;
throw loaderException.Exception;
}
returnValue = Reader.ReadOutputData(reader, connectable);
}
finally
{
reader.Close();
}
}
}
}
catch (QueryTalkException ex)
{
ex.ObjectName = ((IName)connectable.Executable).Name;
ex.Method = Text.Method.Go;
throw;
}
catch (System.InvalidCastException) // "Specified cast is not valid."
{
var mismatchData = Loader.AnalyseInvalidCastException(connectable, currentTableType, tableIndex);
// throw exception with more accurate report
if (mismatchData != null)
{
throw Reader.TypeMismatchException(
((IName)connectable.Executable).Name, Text.Method.Go, currentTableType, mismatchData,
tableIndex);
}
// throw exception with less accurate report (not likely to happen)
else
{
throw Reader.TypeMismatchException(
((IName)connectable.Executable).Name, Text.Method.Go, currentTableType, new Row <string, string, string>(),
tableIndex);
}
}
}
/// <summary>
/// Executes a bulk insert.
/// </summary>
/// <param name="data">The data to be inserted.</param>
/// <param name="table">Is a target table where the data is inserted.</param>
public void BulkInsertGo(Result <DataTable> data, TableArgument table)
{
PublicInvoker.Call(Assembly.GetCallingAssembly(), (ca) =>
Importer.ExecuteBulkInsert(ca, data.ToDataTable(), table, this));
}
/// <summary>
/// Executes a bulk insert.
/// </summary>
/// <param name="rows">The data to be inserted.</param>
public void BulkInsertGo <T>(IEnumerable <T> rows)
where T : DbRow
{
PublicInvoker.Call(Assembly.GetCallingAssembly(), (ca) =>
Importer.ExecuteBulkInsert(ca, rows, this));
}
internal static Result <T> LoadTable <T>(Connectable connectable, Action <T> rowHandler, bool allowEmpty = false)
{
IEnumerable <T> table = null;
int returnValue = 0;
Type type = typeof(T);
if (type == typeof(DataTable))
{
throw new QueryTalkException("Reader.LoadTable<T>", QueryTalkExceptionType.DataTableCannotEnumerate,
((IName)connectable.Executable).Name, ".Go<DataTable>", null);
}
try
{
using (SqlConnection cn = new SqlConnection(connectable.ConnectionString))
{
cn.Open();
Importer.ExecuteBulkInsert(connectable, cn);
using (SqlCommand cmd = new SqlCommand(connectable.Sql, cn))
{
cmd.CommandTimeout = connectable.CommandTimeout;
SqlDataReader reader = cmd.ExecuteReader();
try
{
table = _load <T>(connectable, reader, rowHandler, allowEmpty);
returnValue = Reader.ReadOutputData(reader, connectable);
}
finally
{
reader.Close();
}
}
}
}
catch (QueryTalkException ex)
{
ex.ObjectName = ((IName)connectable.Executable).Name;
ex.Method = Text.Method.Go;
throw;
}
catch (System.InvalidCastException) // "Specified cast is not valid."
{
var mismatchData = Loader.AnalyseInvalidCastException(connectable, type, 0);
// throw exception with accurate report
if (mismatchData != null)
{
var exception = Reader.TypeMismatchException(((IName)connectable.Executable).Name, Text.Method.Go, type, mismatchData);
throw exception;
}
// throw exception with less accurate report (not likely to happen)
else
{
var exception = Reader.TypeMismatchException(
((IName)connectable.Executable).Name, Text.Method.Go, type, new Row <string, string, string>());
throw exception;
}
}
catch (System.ArgumentNullException ex)
{
var exception = ClrException(ex, "Load", connectable,
Text.Method.Go, String.Format("data class = {0}", typeof(T)));
exception.Extra = Text.Free.DataClassNoConstructorExtra;
throw exception;
}
var result = new Result <T>(connectable, table);
result.ReturnValue = returnValue;
return(result);
}
