| public static JetSetCurrentIndex2 ( JET_SESID sesid, JET_TABLEID tableid, string index, SetCurrentIndexGrbit grbit ) : void | ||
| sesid | JET_SESID | The session to use. |
| tableid | JET_TABLEID | The cursor to set the index on. |
| index | string | /// The name of the index to be selected. If this is null or empty the primary /// index will be selected. /// |
| grbit | SetCurrentIndexGrbit | /// Set index options. /// |
| Результат | void | |
public IEnumerable <List <object> > GetRows(string tableName, string indexName = null, int startRow = 0, int rowCount = -1)
{
if (!m_tableDefs.ContainsKey(tableName))
{
LoadTableDef(tableName);
}
using (var table = new Table(m_sesid, m_dbid, tableName, OpenTableGrbit.ReadOnly)) {
var colspec = new List <KeyValuePair <string, Type> >();
try {
Esent.JetSetCurrentIndex2(m_sesid, table, indexName, SetCurrentIndexGrbit.MoveFirst);
if (startRow != 0)
{
Esent.JetMove(m_sesid, table, startRow, MoveGrbit.None);
}
}
catch (EsentNoCurrentRecordException) {
// Return an empty set.
yield break;
}
int rowNumber = 0;
do
{
var values = new List <object>();
object value = null;
foreach (var column in m_tableDefs[tableName])
{
try {
value = column.Retriever(m_sesid, table, column.ColumnId);
}
catch (Microsoft.Isam.Esent.Interop.EsentNoCurrentRecordException) {
// If we get this on row 0, it means there are no rows.
if (rowNumber == 0)
{
yield break;
}
else
{
throw;
}
}
values.Add(value);
}
yield return(values);
rowNumber++;
if (rowNumber == rowCount)
{
yield break;
}
}while (Esent.TryMoveNext(m_sesid, table));
}
} // GetRows
public int GetRowCount(string tableName, string indexName = null)
{
if (string.IsNullOrEmpty(tableName))
{
return(0);
}
using (var table = new Table(m_sesid, m_dbid, tableName, OpenTableGrbit.ReadOnly)) {
if (!string.IsNullOrEmpty(indexName))
{
// This is needed because an index can be over a nullable column and exclude
// the nulls, resulting in fewer records than when not using the index.
Esent.JetSetCurrentIndex2(m_sesid, table, indexName, SetCurrentIndexGrbit.MoveFirst);
}
int numRecords;
Esent.JetIndexRecordCount(m_sesid, table, out numRecords, 0);
return(numRecords);
}
}