| public static JetCloseTable ( JET_SESID sesid, JET_TABLEID tableid ) : void | ||
| sesid | JET_SESID | The session which opened the table. |
| tableid | JET_TABLEID | The table to close. |
| return | void | |
/// <summary>
/// Intersect a group of index ranges and return the bookmarks of the records which are found
/// in all the index ranges.
/// Also see <see cref="JetIntersectIndexes"/>.
/// </summary>
/// <param name="sesid">The session to use.</param>
/// <param name="tableids">
/// The tableids to use. Each tableid must be from a different index on the same table and
/// have an active index range. Use <see cref="JetSetIndexRange"/>
/// to create an index range.
/// </param>
/// <returns>
/// The bookmarks of the records which are found in all the index ranges. The bookmarks
/// are returned in primary key order.
/// </returns>
public static IEnumerable <byte[]> IntersectIndexes(JET_SESID sesid, params JET_TABLEID[] tableids)
{
if (null == tableids)
{
throw new ArgumentNullException("tableids");
}
JET_RECORDLIST recordlist;
var ranges = new JET_INDEXRANGE[tableids.Length];
for (int i = 0; i < tableids.Length; ++i)
{
ranges[i] = new JET_INDEXRANGE {
tableid = tableids[i]
};
}
Api.JetIntersectIndexes(sesid, ranges, ranges.Length, out recordlist, IntersectIndexesGrbit.None);
try
{
if (Api.TryMoveFirst(sesid, recordlist.tableid))
{
do
{
yield return(Api.RetrieveColumn(sesid, recordlist.tableid, recordlist.columnidBookmark));
}while (Api.TryMoveNext(sesid, recordlist.tableid));
}
}
finally
{
Api.JetCloseTable(sesid, recordlist.tableid);
}
}
public IEnumerable <DBRow> GetIndexInfo(string tableName, string indexName)
{
IEnumerable <ColSpec> tableDef = GetIndexTableDef(tableName, indexName);
JET_INDEXLIST indexList;
Esent.JetGetIndexInfo(m_sesid, m_dbid, tableName, indexName, out indexList, JET_IdxInfo.List);
var columnsByName = new Dictionary <string, int>();
int i = 0;
foreach (ColSpec column in tableDef)
{
columnsByName.Add(column.Name, i++);
}
Esent.JetMove(m_sesid, indexList.tableid, JET_Move.First, MoveGrbit.None);
i = 0;
do
{
var row = new List <object>();
foreach (ColSpec column in tableDef)
{
row.Add(column.Retriever(m_sesid, indexList.tableid, column.ColumnId));
}
yield return(new DBRow(columnsByName, row, i++));
}while (Esent.TryMoveNext(m_sesid, indexList.tableid));
Esent.JetCloseTable(m_sesid, indexList.tableid);
}
/// <summary>
/// Closes the table being enumerated.
/// </summary>
protected virtual void CloseTable()
{
if (JET_TABLEID.Nil != this.TableidToEnumerate)
{
Api.JetCloseTable(this.Sesid, this.TableidToEnumerate);
}
this.TableidToEnumerate = JET_TABLEID.Nil;
}
private IEnumerable <ColSpec> GetIndexTableDef(string tableName, string indexName)
{
JET_INDEXLIST indexList;
Esent.JetGetIndexInfo(m_sesid, m_dbid, tableName, indexName, out indexList, JET_IdxInfo.List);
// Unfortunately, Esent.GetTableColumns doesn't work on the temporary table returned by
// JetGetIndexInfo, but the JET_INDEXLIST and the documentation have all the
// information we need.
var tableDef = new ColSpec[] {
new ColSpec
{
Name = "Columns",
Type = typeof(Int32?),
ColumnId = indexList.columnidcColumn
},
new ColSpec
{
Name = "Entries",
Type = typeof(Int32?),
ColumnId = indexList.columnidcEntry
},
new ColSpec
{
Name = "UniqueKeys",
Type = typeof(Int32?),
ColumnId = indexList.columnidcKey
},
new ColSpec {
Name = "Coltyp",
Type = typeof(Int32?),
ColumnId = indexList.columnidcoltyp
},
new ColSpec {
Name = "ColumnId",
Type = typeof(Int32?),
ColumnId = indexList.columnidcolumnid
},
new ColSpec {
Name = "ColumnName",
Type = typeof(string),
ColumnId = indexList.columnidcolumnname
},
new ColSpec {
Name = "CodePage",
Type = typeof(Int16?),
ColumnId = indexList.columnidCp
},
new ColSpec {
Name = "NumPages",
Type = typeof(Int32?),
ColumnId = indexList.columnidcPage
},
new ColSpec {
Name = "grbitColumn",
Type = typeof(Int32?),
ColumnId = indexList.columnidgrbitColumn
},
new ColSpec {
Name = "grbitIndex",
Type = typeof(Int32?),
ColumnId = indexList.columnidgrbitIndex
},
new ColSpec {
Name = "iColumn",
Type = typeof(Int32?),
ColumnId = indexList.columnidiColumn
},
new ColSpec {
Name = "IndexName",
Type = typeof(string),
ColumnId = indexList.columnidindexname
},
new ColSpec {
Name = "LangId",
Type = typeof(Int16?),
ColumnId = indexList.columnidLangid
},
new ColSpec {
Name = "LCMapFlags",
Type = typeof(Int32?),
ColumnId = indexList.columnidLCMapFlags
}
};
for (int i = 0, n = tableDef.Length; i < n; i++)
{
tableDef[i].Retriever = ColumnRetrievers.ForType(tableDef[i].Type);
}
Esent.JetCloseTable(m_sesid, indexList.tableid);
return(tableDef);
}
/// <summary>
/// Called when the object is being disposed or finalized.
/// </summary>
/// <param name="disposing">True if the function was called from Dispose.</param>
protected virtual void Dispose(bool disposing)
{
Api.JetCloseTable(this.sesid, this.tableid);
}
