'Declaration Public Overrides Function GetSchemaTable() As DataTable
public override DataTable GetSchemaTable()
Return Value
A System.Data.DataTable that describes the column metadata.
'Declaration Public Overrides Function GetSchemaTable() As DataTable
public override DataTable GetSchemaTable()
| DataReader Column | Description |
|---|---|
| ColumnName | The name of the column; this might not be unique. If the column name cannot be determined, a null value is returned. This name always reflects the most recent naming of the column in the current view or command text. |
| ColumnOrdinal | The ordinal of the column. This is zero for the bookmark column of the row, if any. Other columns are numbered starting with 1. This column cannot contain a null value. |
| ColumnSize | The maximum possible length of a value in the column. For columns that use a fixed-length data type, this is the size of the data type. |
| NumericPrecision | If System.Data.DbType is a numeric data type, this is the maximum precision of the column. The precision depends on the definition of the column. If System.Data.DbType is not a numeric data type, this is a null value. |
| NumericScale | If System.Data.DbType is Decimal, the number of digits to the right of the decimal point. Otherwise, this is a null value. |
| DataType | Maps to the .Net Framework type of the column. |
| ProviderType | The indicator of the column's data type. |
| IsLong | true if the column contains a bytea that contains very long data. |
| AllowDBNull | true if the consumer can set the column to a null value. Otherwise, false. A column may contain null values, even if it cannot be set to a null value. |
| IsReadOnly | true if the column can be modified; otherwise, false. |
| IsRowVersion | Set if the column contains a persistent row identifier that cannot be written to, and has no meaningful value except to identity the row. |
| IsUnique | true: No two rows in the base table-the table returned in BaseTableName-can have the same value in this column. IsUnique is guaranteed to be true if the column constitutes a key by itself or if there is a constraint of type UNIQUE that applies only to this column. false: The column can contain duplicate values in the base table.The default for this column is false. |
| IsKey | true: The column is one of a set of columns in the rowset that, taken together, uniquely identify the row. The set of columns with IsKey set to true must uniquely identify a row in the rowset. There is no requirement that this set of columns is a minimal set of columns. This set of columns may be generated from a base table primary key, a unique constraint or a unique index. false: The column is not required to uniquely identify the row. |
| IsAutoIncrement | true if the column assigns values to new rows in fixed increments; otherwise, false. The default value for this column is false. |
| BaseSchemaName | The name of the schema in the database that contains the column. NULL if the base catalog name cannot be determined. The default for this column is a null value. |
| BaseCatalogName | The name of the catalog in the data store that contains the column. NULL if the base catalog name cannot be determined. The default value for this column is a null value. |
| BaseTableName | The name of the table or view in the data store that contains the column. A null value if the base table name cannot be determined. The default value of this column is a null value. |
| BaseColumnName | The name of the column in the data store. This might be different than the column name returned in the ColumnName column if an alias was used. A null value if the base column name cannot be determined or if the rowset column is derived, but not identical to, a column in the data store. The default value for this column is a null value. |
| IsAliased | true if the column name is an alias; otherwise, false. |
| IsExpression | true if the column is an expression; otherwise, false. |
Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2