ColumnDataInfo.ColumnName Property
Gets or sets a value that specifies the name of the database column.
Namespace: Microsoft.Web.Management.DatabaseManager
Assembly: Microsoft.Web.Management.DatabaseManager (in Microsoft.Web.Management.DatabaseManager.dll)
Syntax
'Declaration
Public Property ColumnName As String
'Usage
Dim instance As ColumnDataInfo
Dim value As String
value = instance.ColumnName
public string ColumnName { get; internal set; }
public:
property String^ ColumnName {
String^ get ();
internal: void set (String^ value);
}
function get ColumnName () : String
internal function set ColumnName (value : String)
Property Value
Type: System.String
The name of the database column.
Examples
The following code sample implements the InsertRow method to insert data into a database table in an OLEDB data source.
Note
This example also provides helper methods that perform additional database tasks.
Public Function InsertRow( _
ByVal connectionString As String, _
ByVal tableName As String, _
ByVal schema As String, _
ByVal columnDataInfoList _
As System.Collections.Generic.IList( _
Of Microsoft.Web.Management.DatabaseManager.ColumnDataInfo)) _
As Object() _
Implements Microsoft.Web.Management.DatabaseManager.IDbTableDataManager.InsertRow
Dim insertFieldsText As StringBuilder = New StringBuilder
Dim valuesText As StringBuilder = New StringBuilder
Dim whereText As StringBuilder = New StringBuilder
Dim selectFieldsText As StringBuilder = New StringBuilder
Dim insertedRow() As Object = Nothing
Dim connection As OleDbConnection = New OleDbConnection(connectionString)
Dim command As OleDbCommand = New OleDbCommand
command.Connection = connection
command.CommandType = CommandType.Text
For Each info As ColumnDataInfo In columnDataInfoList
' Append the column to the SELECT fields.
selectFieldsText.Append(EscapeName(info.ColumnName))
selectFieldsText.Append(",")
' Only update modified fields.
If (info.IsEdited = True) Then
' Append the column to the INSERT fields.
insertFieldsText.Append(EscapeName(info.ColumnName))
insertFieldsText.Append(",")
valuesText.Append("?,")
' Append the column to the WHERE statement.
whereText.Append(String.Format("({0} = ?)", EscapeName(info.ColumnName)))
whereText.Append(" AND ")
' Determine the OLEDB type for the column.
Dim dbType As OleDbType = StringToOleDbType(info.TypeInfo.ToString)
'
Dim parameter As OleDbParameter = command.CreateParameter
parameter.ParameterName = ("@" + info.ColumnName)
parameter.OleDbType = dbType
' Test if the column is a GUID field.
If (dbType = OleDbType.Guid) Then
' Convert the GUID string back to a GUID for the parameter.
parameter.Value = New Guid(info.NewValue.ToString)
Else
' Add the parameter value.
parameter.Value = GetDataValue(info.NewValue)
End If
parameter.Direction = ParameterDirection.Input
command.Parameters.Add(parameter)
End If
Next
insertFieldsText.Remove((insertFieldsText.Length - 1), 1)
valuesText.Remove((valuesText.Length - 1), 1)
whereText.Remove((whereText.Length - 5), 5)
selectFieldsText.Remove((selectFieldsText.Length - 1), 1)
command.CommandText = String.Format("INSERT INTO {0} ({1}) VALUES({2})", EscapeName(tableName), insertFieldsText.ToString, valuesText.ToString)
' Open the database connection.
connection.Open()
' Run the query.
ExecuteNonQuery(connection, command)
' Close the database connection.
connection.Close()
Return insertedRow
End Function
...
Private Shared Function ConvertToSerializable(ByVal data As Object) As Object
If (TypeOf data Is DBNull) Then
Return Nothing
ElseIf (TypeOf data Is Decimal) Then
Return CType(CType(data, Decimal), Double)
ElseIf (TypeOf data Is Guid) Then
Return data.ToString
Else
Return data
End If
End Function
...
' Run a transactional query.
Private Function ExecuteNonQuery( _
ByVal connection As OleDbConnection, _
ByVal command As OleDbCommand) As Integer
' Begin a transaction.
Dim transaction As OleDbTransaction = connection.BeginTransaction
' Specify the transaction for the command.
command.Transaction = transaction
Try
' Run the query.
Dim records As Integer = command.ExecuteNonQuery
' Test for the number of affected rows.
If (records > 1) Then
' Throw an error if more than one row was affected.
Dim e As InvalidOperationException = New InvalidOperationException
e.Data("RowsAffected") = records
Throw e
End If
' Commit the transaction.
transaction.Commit()
' Return the count of affected records.
Return records
Catch ex As Exception
' Roll back the transaction if en exception occurred
transaction.Rollback()
' Raise an exception when an error occured.
Throw New ProviderException(ex.Message)
End Try
End Function
...
Private Shared Function GetDataValue(ByVal value As Object) As Object
If (value Is Nothing) Then
Return DBNull.Value
Else
Return value
End If
End Function
public object[] InsertRow(string connectionString, string tableName, string schema, IList<ColumnDataInfo> columnDataInfoList)
{
StringBuilder insertFieldsText = new StringBuilder();
StringBuilder valuesText = new StringBuilder();
StringBuilder whereText = new StringBuilder();
StringBuilder selectFieldsText = new StringBuilder();
Object[] insertedRow = null;
using (OleDbConnection connection = new OleDbConnection(connectionString))
{
using (OleDbCommand command = new OleDbCommand())
{
command.Connection = connection;
command.CommandType = CommandType.Text;
foreach (ColumnDataInfo info in columnDataInfoList)
{
// Append the column to the SELECT fields.
selectFieldsText.Append(EscapeName(info.ColumnName));
selectFieldsText.Append(",");
// Only update modified fields.
if (info.IsEdited == true)
{
// Append the column to the INSERT fields.
insertFieldsText.Append(EscapeName(info.ColumnName));
insertFieldsText.Append(",");
valuesText.Append("?,");
// Append the column to the WHERE statement.
whereText.Append(string.Format("({0} = ?)", EscapeName(info.ColumnName)));
whereText.Append(" AND ");
// Determine the OLEDB type for the column.
OleDbType dbType = StringToOleDbType(info.TypeInfo.ToString());
//
OleDbParameter parameter = command.CreateParameter();
parameter.ParameterName = "@" + info.ColumnName;
parameter.OleDbType = dbType;
// Test if the column is a GUID field.
if (dbType == OleDbType.Guid)
{
// Convert the GUID string back to a GUID for the parameter.
parameter.Value = new Guid(info.NewValue.ToString());
}
else
{
// Add the parameter value.
parameter.Value = GetDataValue(info.NewValue);
}
parameter.Direction = ParameterDirection.Input;
command.Parameters.Add(parameter);
}
}
insertFieldsText.Remove(insertFieldsText.Length - 1, 1);
valuesText.Remove(valuesText.Length - 1, 1);
whereText.Remove(whereText.Length - 5, 5);
selectFieldsText.Remove(selectFieldsText.Length - 1, 1);
command.CommandText = String.Format("INSERT INTO {0} ({1}) VALUES({2})", EscapeName(tableName), insertFieldsText.ToString(), valuesText.ToString());
// Open the database connection.
connection.Open();
// Run the query.
ExecuteNonQuery(connection,command);
// Close the database connection.
connection.Close();
}
}
return insertedRow;
}
...
private static object ConvertToSerializable(object data)
{
if (data is DBNull)
{
return null;
}
else if (data is Decimal)
{
return (double)((Decimal)data);
}
else if (data is Guid)
{
return data.ToString();
}
else
{
return data;
}
}
...
// Run a transactional query.
private int ExecuteNonQuery(OleDbConnection connection, OleDbCommand command)
{
// Begin a transaction.
OleDbTransaction transaction = connection.BeginTransaction();
// Specify the transaction for the command.
command.Transaction = transaction;
try
{
// Run the query.
int records = command.ExecuteNonQuery();
// Test for the number of affected rows.
if (records > 1)
{
// Throw an error if more than one row was affected.
InvalidOperationException e = new InvalidOperationException();
e.Data["RowsAffected"] = records;
throw e;
}
// Commit the transaction.
transaction.Commit();
// Return the count of affected records.
return records;
}
catch (Exception ex)
{
// Roll back the transaction if en exception occurred
transaction.Rollback();
// Raise an exception when an error occured.
throw new ProviderException(ex.Message);
}
}
...
// Compute if a data value is null.
private static object GetDataValue(object value)
{
return (value == null ? DBNull.Value : value);
}
Permissions
- Full trust for the immediate caller. This member cannot be used by partially trusted code. For more information, see Using Libraries from Partially Trusted Code.