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);
}
private List <ColSpec> GetTableDef(JET_TABLEID table)
{
var columns = new List <ColumnInfo>(Esent.GetTableColumns(m_sesid, table));
var tableDef = new List <ColSpec>();
foreach (var column in columns)
{
var colspec = new ColSpec();
colspec.Name = column.Name;
colspec.ColumnId = column.Columnid;
colspec.Retriever = null;
switch (column.Coltyp)
{
case JET_coltyp.Text:
case JET_coltyp.LongText:
colspec.Type = typeof(string);
break;
case JET_coltyp.Long:
colspec.Type = typeof(int?);
break;
case JET_coltyp.Short:
colspec.Type = typeof(short?);
break;
case JET_coltyp.UnsignedByte:
colspec.Type = typeof(byte?);
break;
case JET_coltyp.Bit:
colspec.Type = typeof(bool?);
break;
case JET_coltyp.DateTime:
colspec.Type = typeof(DateTime?);
break;
case JET_coltyp.IEEEDouble:
colspec.Type = typeof(double?);
break;
case JET_coltyp.IEEESingle:
colspec.Type = typeof(float?);
break;
case JET_coltyp.Binary:
case JET_coltyp.LongBinary:
colspec.Retriever = (s, t, c) =>
{
byte[] value = Esent.RetrieveColumn(s, t, c);
if (value != null)
{
return(Convert.ToBase64String(value));
}
else
{
return(value);
}
};
colspec.Type = typeof(string);
break;
case VistaColtyp.UnsignedLong:
colspec.Type = typeof(UInt32?);
break;
case VistaColtyp.LongLong:
colspec.Type = typeof(Int64?);
break;
case VistaColtyp.GUID:
colspec.Type = typeof(Guid?);
break;
case VistaColtyp.UnsignedShort:
colspec.Type = typeof(UInt16?);
break;
default:
colspec.Retriever = (s, t, c) => "ERROR: unhandled type " + Enum.GetName(typeof(JET_coltyp), column.Coltyp) + "(" + (int)column.Coltyp + ")";
colspec.Type = typeof(string);
break;
}
if (colspec.Retriever == null)
{
colspec.Retriever = ColumnRetrievers.ForType(colspec.Type);
}
tableDef.Add(colspec);
}
return(tableDef);
}