|
private GetColumnMappingBySchemaAction ( string sourceColumn, MissingMappingAction mappingAction ) : |
||
| sourceColumn | string | |
| mappingAction | MissingMappingAction | |
| Результат | ||
private DataColumn GetParameterDataColumn(String columnName, DataTableMapping mappings, DataRow row)
{
if (!ADP.IsEmpty(columnName))
{
DataColumnMapping columnMapping = mappings.GetColumnMappingBySchemaAction(columnName, this.missingMapping);
if (null != columnMapping)
{
return(columnMapping.GetDataColumnBySchemaAction(row.Table, null, missingSchema));
}
}
return(null);
}
private void UpdateParameterValues(
IDbCommand command,
StatementType statementType,
DataRow row,
DataTableMapping tableMapping)
{
foreach (DbParameter parameter in command.Parameters)
{
// Process only input parameters
if ((parameter.Direction == ParameterDirection.Input || parameter.Direction == ParameterDirection.InputOutput) &&
!String.IsNullOrEmpty(parameter.SourceColumn))
{
DataColumn column = null;
/* Get the DataColumnMapping that matches the given
* column name
*/
DataColumnMapping columnMapping = tableMapping.GetColumnMappingBySchemaAction(
parameter.SourceColumn,
MissingMappingAction);
if (columnMapping != null)
{
column = columnMapping.GetDataColumnBySchemaAction(row.Table, null, MissingSchemaAction);
if (column != null)
{
DataRowVersion dataRowVersion = DataRowVersion.Default;
if (statementType == StatementType.Insert)
{
dataRowVersion = DataRowVersion.Current;
}
else if (statementType == StatementType.Update)
{
dataRowVersion = parameter.SourceVersion;
}
else if (statementType == StatementType.Delete)
{
dataRowVersion = DataRowVersion.Original;
}
if (parameter.SourceColumnNullMapping)
{
parameter.Value = IsNull(row[column, dataRowVersion]) ? 1 : 0;
}
else
{
parameter.Value = row[column, dataRowVersion];
}
}
}
}
}
}
/// <summary>
/// Review .NET Framework documentation.
/// </summary>
protected override int Update(DataRow[] dataRows, DataTableMapping tableMapping)
{
int updated = 0;
IDbCommand command = null;
StatementType statementType = StatementType.Insert;
ICollection<IDbConnection> connections = new List<IDbConnection>();
RowUpdatingEventArgs updatingArgs = null;
Exception updateException = null;
foreach (DataRow row in dataRows)
{
updateException = null;
if (row.RowState == DataRowState.Detached ||
row.RowState == DataRowState.Unchanged)
{
continue;
}
switch (row.RowState)
{
case DataRowState.Unchanged:
case DataRowState.Detached:
continue;
case DataRowState.Added:
command = InsertCommand;
statementType = StatementType.Insert;
break;
case DataRowState.Modified:
command = UpdateCommand;
statementType = StatementType.Update;
break;
case DataRowState.Deleted:
command = DeleteCommand;
statementType = StatementType.Delete;
break;
}
/* The order of execution can be reviewed in the .NET 1.1 documentation
*
* 1. The values in the DataRow are moved to the parameter values.
* 2. The OnRowUpdating event is raised.
* 3. The command executes.
* 4. If the command is set to FirstReturnedRecord, then the first returned result is placed in the DataRow.
* 5. If there are output parameters, they are placed in the DataRow.
* 6. The OnRowUpdated event is raised.
* 7 AcceptChanges is called.
*/
try
{
updatingArgs = CreateRowUpdatingEvent(row, command, statementType, tableMapping);
/* 1. Update Parameter values (It's very similar to what we
* are doing in the FbCommandBuilder class).
*
* Only input parameters should be updated.
*/
if (command != null && command.Parameters.Count > 0)
{
try
{
UpdateParameterValues(command, statementType, row, tableMapping);
}
catch (Exception ex)
{
updatingArgs.Errors = ex;
updatingArgs.Status = UpdateStatus.ErrorsOccurred;
}
}
// 2. Raise RowUpdating event
OnRowUpdating(updatingArgs);
if (updatingArgs.Status == UpdateStatus.SkipAllRemainingRows)
{
break;
}
else if (updatingArgs.Status == UpdateStatus.ErrorsOccurred)
{
if (updatingArgs.Errors == null)
{
throw new InvalidOperationException("RowUpdatingEvent: Errors occurred; no additional information is available.");
}
throw updatingArgs.Errors;
}
else if (updatingArgs.Status == UpdateStatus.SkipCurrentRow)
{
updated++;
continue;
}
else if (updatingArgs.Status == UpdateStatus.Continue)
{
if (command != updatingArgs.Command)
{
command = updatingArgs.Command;
}
if (command == null)
{
/* Samples of exceptions thrown by DbDataAdapter class
*
* Update requires a valid InsertCommand when passed DataRow collection with new rows
* Update requires a valid UpdateCommand when passed DataRow collection with modified rows.
* Update requires a valid DeleteCommand when passed DataRow collection with deleted rows.
*/
throw new InvalidOperationException(CreateExceptionMessage(statementType));
}
// 3. Execute the command
if (command.Connection.State == ConnectionState.Closed)
{
command.Connection.Open();
// Track command connection
connections.Add(command.Connection);
}
int rowsAffected = command.ExecuteNonQuery();
if (rowsAffected == 0)
{
throw new DBConcurrencyException(new DBConcurrencyException().Message, null, new DataRow[] { row });
}
updated++;
// http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=933212&SiteID=1
if (statementType == StatementType.Insert)
{
row.AcceptChanges();
}
/* 4. If the command is set to FirstReturnedRecord, then the
* first returned result is placed in the DataRow.
*
* We have nothing to do in this case as there are no
* support for batch commands.
*/
/* 5. Check if we have output parameters and they should
* be updated.
*
* Only output parameters should be updated
*/
if (command.UpdatedRowSource == UpdateRowSource.OutputParameters ||
command.UpdatedRowSource == UpdateRowSource.Both)
{
// Process output parameters
foreach (IDataParameter parameter in command.Parameters)
{
if ((parameter.Direction == ParameterDirection.Output ||
parameter.Direction == ParameterDirection.ReturnValue ||
parameter.Direction == ParameterDirection.InputOutput) &&
!String.IsNullOrEmpty(parameter.SourceColumn))
{
DataColumn column = null;
DataColumnMapping columnMapping = tableMapping.GetColumnMappingBySchemaAction(
parameter.SourceColumn,
MissingMappingAction);
if (columnMapping != null)
{
column = columnMapping.GetDataColumnBySchemaAction(
row.Table,
null,
MissingSchemaAction);
if (column != null)
{
row[column] = parameter.Value;
}
}
}
}
}
}
}
catch (Exception ex)
{
row.RowError = ex.Message;
updateException = ex;
}
if (updatingArgs != null && updatingArgs.Status == UpdateStatus.Continue)
{
// 6. Raise RowUpdated event
RowUpdatedEventArgs updatedArgs = CreateRowUpdatedEvent(row, command, statementType, tableMapping);
OnRowUpdated(updatedArgs);
if (updatedArgs.Status == UpdateStatus.SkipAllRemainingRows)
{
break;
}
else if (updatedArgs.Status == UpdateStatus.ErrorsOccurred)
{
if (updatingArgs.Errors == null)
{
throw new InvalidOperationException("RowUpdatedEvent: Errors occurred; no additional information available.");
}
throw updatedArgs.Errors;
}
else if (updatedArgs.Status == UpdateStatus.SkipCurrentRow)
{
}
else if (updatingArgs.Status == UpdateStatus.Continue)
{
// If the update result is an exception throw it
if (!ContinueUpdateOnError && updateException != null)
{
CloseConnections(connections);
throw updateException;
}
// 7. Call AcceptChanges
if (AcceptChangesDuringUpdate && !row.HasErrors)
{
row.AcceptChanges();
}
}
}
else
{
// If the update result is an exception throw it
if (!ContinueUpdateOnError && updateException != null)
{
CloseConnections(connections);
throw updateException;
}
}
}
CloseConnections(connections);
return updated;
}
/// <summary>
/// Review .NET Framework documentation.
/// </summary>
protected override int Update(DataRow[] dataRows, DataTableMapping tableMapping)
{
int updated = 0;
IDbCommand command = null;
StatementType statementType = StatementType.Insert;
ArrayList connections = new ArrayList();
RowUpdatingEventArgs updatingArgs = null;
Exception updateException = null;
foreach (DataRow row in dataRows)
{
if (row.RowState == DataRowState.Detached ||
row.RowState == DataRowState.Unchanged)
{
continue;
}
switch (row.RowState)
{
case DataRowState.Added:
command = this.insertCommand;
statementType = StatementType.Insert;
break;
case DataRowState.Modified:
command = this.updateCommand;
statementType = StatementType.Update;
break;
case DataRowState.Deleted:
command = this.deleteCommand;
statementType = StatementType.Delete;
break;
}
/* The order of execution can be reviewed in the .NET 1.1 documentation
*
* 1. The values in the DataRow are moved to the parameter values.
* 2. The OnRowUpdating event is raised.
* 3. The command executes.
* 4. If the command is set to FirstReturnedRecord, then the first returned result is placed in the DataRow.
* 5. If there are output parameters, they are placed in the DataRow.
* 6. The OnRowUpdated event is raised.
* 7 AcceptChanges is called.
*/
try
{
/* 1. Update Parameter values (It's very similar to what we
* are doing in the FbCommandBuilder class).
*
* Only input parameters should be updated.
*/
if (command != null && command.Parameters.Count > 0)
{
this.UpdateParameterValues(command, statementType, row, tableMapping);
}
// 2. Raise RowUpdating event
updatingArgs = this.CreateRowUpdatingEvent(row, command, statementType, tableMapping);
this.OnRowUpdating(updatingArgs);
if (updatingArgs.Status == UpdateStatus.SkipAllRemainingRows)
{
break;
}
else if (updatingArgs.Status == UpdateStatus.ErrorsOccurred)
{
if (updatingArgs.Errors == null)
{
throw new InvalidOperationException("RowUpdatingEvent: Errors occurred; no additional is information available.");
}
throw updatingArgs.Errors;
}
else if (updatingArgs.Status == UpdateStatus.SkipCurrentRow)
{
}
else if (updatingArgs.Status == UpdateStatus.Continue)
{
if (command != updatingArgs.Command)
{
command = updatingArgs.Command;
}
if (command == null)
{
/* Samples of exceptions thrown by DbDataAdapter class
*
* Update requires a valid InsertCommand when passed DataRow collection with new rows
* Update requires a valid UpdateCommand when passed DataRow collection with modified rows.
* Update requires a valid DeleteCommand when passed DataRow collection with deleted rows.
*/
string message = this.CreateExceptionMessage(statementType);
throw new InvalidOperationException(message);
}
/* Validate that the command has a connection */
if (command.Connection == null)
{
throw new InvalidOperationException("Update requires a command with a valid connection.");
}
// 3. Execute the command
if (command.Connection.State == ConnectionState.Closed)
{
command.Connection.Open();
// Track command connection
connections.Add(command.Connection);
}
int rowsAffected = command.ExecuteNonQuery();
if (rowsAffected == 0)
{
throw new DBConcurrencyException("An attempt to execute an INSERT, UPDATE, or DELETE statement resulted in zero records affected.");
}
updated++;
/* 4. If the command is set to FirstReturnedRecord, then the
* first returned result is placed in the DataRow.
*
* We have nothing to do in this case as there are no
* support for batch commands.
*/
/* 5. Check if we have output parameters and they should
* be updated.
*
* Only output paraneters should be updated
*/
if (command.UpdatedRowSource == UpdateRowSource.OutputParameters ||
command.UpdatedRowSource == UpdateRowSource.Both)
{
// Process output parameters
foreach (IDataParameter parameter in command.Parameters)
{
if ((parameter.Direction == ParameterDirection.Output ||
parameter.Direction == ParameterDirection.ReturnValue ||
parameter.Direction == ParameterDirection.InputOutput) &&
parameter.SourceColumn != null &&
parameter.SourceColumn.Length > 0)
{
DataColumn column = null;
DataColumnMapping columnMapping = tableMapping.GetColumnMappingBySchemaAction(
parameter.SourceColumn,
this.MissingMappingAction);
if (columnMapping != null)
{
column = columnMapping.GetDataColumnBySchemaAction(
row.Table,
null,
this.MissingSchemaAction);
if (column != null)
{
row[column] = parameter.Value;
}
}
}
}
}
}
}
catch (Exception ex)
{
row.RowError = ex.Message;
updateException = ex;
}
if (updatingArgs.Status == UpdateStatus.Continue)
{
// 6. Raise RowUpdated event
RowUpdatedEventArgs updatedArgs = this.CreateRowUpdatedEvent(row, command, statementType, tableMapping);
this.OnRowUpdated(updatedArgs);
if (updatedArgs.Status == UpdateStatus.SkipAllRemainingRows)
{
break;
}
else if (updatedArgs.Status == UpdateStatus.ErrorsOccurred)
{
if (updatingArgs.Errors == null)
{
throw new InvalidOperationException("RowUpdatedEvent: Errors occurred; no additional information available.");
}
throw updatedArgs.Errors;
}
else if (updatedArgs.Status == UpdateStatus.SkipCurrentRow)
{
}
else if (updatingArgs.Status == UpdateStatus.Continue)
{
// If the update result is an exception throw it
if (!this.ContinueUpdateOnError && updateException != null)
{
this.CloseConnections(connections);
throw updateException;
}
// 7. Call AcceptChanges
row.AcceptChanges();
}
}
else
{
// If the update result is an exception throw it
if (!this.ContinueUpdateOnError && updateException != null)
{
this.CloseConnections(connections);
throw updateException;
}
}
updateException = null;
}
this.CloseConnections(connections);
return updated;
}
private void SetupSchemaWithoutKeyInfo(MissingMappingAction mappingAction, MissingSchemaAction schemaAction, bool gettingData, DataColumn parentChapterColumn, object chapterValue)
{
int[] columnIndexMap = null;
bool[] chapterIndexMap = null;
int mappingCount = 0;
int count = this.dataReader.FieldCount;
GenerateFieldNames(count);
DataColumnCollection columnCollection = null;
for (int i = 0; i < count; ++i)
{
DataColumnMapping columnMapping = tableMapping.GetColumnMappingBySchemaAction(fieldNames[i], mappingAction);
if (null == columnMapping)
{
if (null == columnIndexMap)
{
columnIndexMap = CreateIndexMap(count, i);
}
columnIndexMap[i] = -1;
continue; // null means ignore (mapped to nothing)
}
bool ischapter = false;
Type fieldType = this.dataReader.GetFieldType(i);
if (typeof(IDataReader).IsAssignableFrom(fieldType))
{
if (null == chapterIndexMap)
{
chapterIndexMap = new bool[count];
}
chapterIndexMap[i] = ischapter = true;
fieldType = typeof(Int32);
}
DataColumn dataColumn = columnMapping.GetDataColumnBySchemaAction(this.dataTable, fieldType, schemaAction);
if (null == dataColumn)
{
if (null == columnIndexMap)
{
columnIndexMap = CreateIndexMap(count, i);
}
columnIndexMap[i] = -1;
continue; // null means ignore (mapped to nothing)
}
if (null == dataColumn.Table)
{
if (ischapter)
{
dataColumn.AllowDBNull = false;
dataColumn.AutoIncrement = true;
dataColumn.ReadOnly = true;
}
if (null == columnCollection)
{
columnCollection = dataTable.Columns;
}
columnCollection.Add(dataColumn);
}
else if (ischapter && !dataColumn.AutoIncrement)
{
throw ADP.FillChapterAutoIncrement();
}
if (null != columnIndexMap)
{
columnIndexMap[i] = dataColumn.Ordinal;
}
else if (i != dataColumn.Ordinal)
{
columnIndexMap = CreateIndexMap(count, i);
columnIndexMap[i] = dataColumn.Ordinal;
}
mappingCount++;
}
bool addDataRelation = false;
DataColumn chapterColumn = null;
if (null != chapterValue) // add the extra column in the child table
{
DataColumnMapping columnMapping = tableMapping.GetColumnMappingBySchemaAction(tableMapping.SourceTable, mappingAction);
if (null != columnMapping)
{
Type fieldType = chapterValue.GetType();
chapterColumn = columnMapping.GetDataColumnBySchemaAction(this.dataTable, fieldType, schemaAction);
if (null != chapterColumn)
{
if (null == chapterColumn.Table)
{
if (null == columnCollection)
{
columnCollection = dataTable.Columns;
}
columnCollection.Add(chapterColumn);
addDataRelation = (null != parentChapterColumn);
}
mappingCount++;
}
}
}
object[] dataValues = null;
if (0 < mappingCount)
{
if ((null != this.dataSet) && (null == this.dataTable.DataSet))
{
// Allowed to throw exception if DataTable is from wrong DataSet
this.dataSet.Tables.Add(this.dataTable);
}
if (gettingData)
{
if (null == columnCollection)
{
columnCollection = dataTable.Columns;
}
_indexMap = columnIndexMap;
_chapterMap = chapterIndexMap;
dataValues = SetupMapping(count, columnCollection, chapterColumn, chapterValue);
}
#if DEBUG
else
{
this.mappedMode = -1;
}
#endif
}
else
{
this.dataTable = null;
}
if (addDataRelation)
{
AddRelation(parentChapterColumn, chapterColumn);
}
_readerDataValues = dataValues;
}
private DataColumn GetDataColumn(
string columnName, DataTableMapping tableMapping, DataRow row)
{
DataColumn dataColumn = null;
// Get the DataColumnMapping that matches
// the given column name
DataColumnMapping columnMapping = tableMapping.GetColumnMappingBySchemaAction(
columnName, this.dataAdapter.MissingMappingAction);
if (columnMapping != null)
{
// Get the DataColumn for the given column name
dataColumn = columnMapping.GetDataColumnBySchemaAction(
row.Table,
null,
this.dataAdapter.MissingSchemaAction);
}
return dataColumn;
}
