public void EnsureTable(DbDataReader dbReader)
{
var reader = (NpgsqlDataReader)dbReader;
lock (lockObject)
{
var readerColumns = PostgreeSqlDatabase.GetColumns(reader);
if (columns != null)
{
CheckColumns(columns, "original", readerColumns, "current");
return;
}
columns = readerColumns;
if (historyMode)
{
if (!target.TableExists(tableName))
{
target.CreateTable(tableName, columns);
}
else
{
var existingColumns = target.GetColumns(tableName);
CheckColumns(existingColumns, "existing", columns, "new");
}
}
else
{
if (target.TableExists(tableName))
{
target.DropTable("dbo." + tableName);
}
target.CreateTable(tableName, columns);
}
}
}
public void BeginWrite(DataColumn[] newColumns)
{
columns = newColumns;
if (historyMode)
{
if (!target.TableExists(tableName))
{
target.CreateTable(tableName, newColumns);
}
else
{
var existingColumns = target.GetColumns(tableName);
DatabaseHelpers.CheckColumnsAreEqual(existingColumns, "existing", newColumns, "new");
}
}
else
{
if (target.TableExists(tableName))
{
target.DropTable("dbo." + tableName);
}
target.CreateTable(tableName, newColumns);
}
}