Returns a DataTable that describes the column metadata of the FbDataReader.
A DataTable that describes the column metadata.
DataReader Column | Description |
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ColumnName | The name of the column; this might not be unique. If this cannot be determined, a null value is returned. This name always reflects the most recent renaming of the column in the current view or command text. |
ColumnOrdinal | The ordinal of the column. Columns are numbered starting with one. 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 ProviderType is a numeric data type, this is the maximum precision of the column. The precision depends on the definition of the column. If ProviderType is not a numeric data type, this is a null value. |
NumericScale | If ProviderType is is DECIMAL or NUMERIC data type, 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. If the data type of the column varies from row to row, this must be Object. This column cannot contain a null value. |
IsLong | True if the column contains a BLOB that contains very long data; otherwise false. |
AllowDbNull | True if the column allows null values; otherwise false. |
IsReadOnly | True if the column cannot 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 if the the column is one of a set of columns of a unique key. |
IsKey | true if the the column is one of a set of columns of a primary key. |
IsAutoIncrement | true if the column assigns values to new rows in fixed increments; otherwise false. The default of this column is false. |
IsAliased | True if the column name is an alias; otherwise false. |
IsExpression | True if the column is an expression; otherwise false. |
BaseSchemaName | As Firebird doesn't support Schemas this column will be always NULL. |
BaseCatalogName | As Firebird doesn't support Catalogs this column will be always NULL. |
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 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 of this column is a null value. |
Exception Type | Condition |
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InvalidOperationException | The FbDataReader is closed. |
FbDataReader Class | FirebirdSql.Data.Firebird Namespace