'UsageDim instance As MimerDataReader Dim value As DataTable value = instance.GetSchemaTable()
public override DataTable GetSchemaTable()
public function GetSchemaTable(): DataTable; override;
public override function GetSchemaTable() : DataTable;
public: DataTable* GetSchemaTable(); override
| Column name | Remarks |
|---|---|
| ColumnName | The column label, or column name if no label has been specified. If there is no name a null value is returned. Please note that the values may not be unique. |
| ColumnOrdinal | Ordinal position of row starting with one. |
| 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. For a structured user-defined type zero is returned. |
| 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 decimal or numeric, this is the number of digits to the right of the decimal point. Otherwise, this is a null value. |
| DataType | .NET Framework data type. |
| ProviderType | The indicator of the column's data type. This column cannot contain a null value. |
| IsLong | Set if the column contains a Binary Large Object (BLOB), Character Large Object (CLOB), or National Character Large Object (NCLOB). |
| AllowDBNull | Indicates whether the column may contain null values or not. |
| 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. The Mimer Data Provider currently always returns false. |
| IsUnique |
true if 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 if the column can contain duplicate values in the base table.
When connected to a Mimer SQL Mobile database this property is always false. |
| IsKey |
true if 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. This set of columns may not be a minimal set of columns. The columns may be generated from a base table primary key, a unique constraint, or a unique index. false if the column is not included in a unique constraint.
When connected to a Mimer SQL Mobile database this property is always false. |
| IsAutoIncrement |
Mimer Data Provider returns true if the default value is a sequence, otherwise false.
When connected to a Mimer SQL Mobile database this property is always false. |
| BaseSchemaName | The name of the schema in the database that contains the column. |
| BaseCatalogName | Mimer Data Provider currently always return null in this column. |
| BaseTableName | The name of the table or view in the database that contains the column. A null value if the base table name cannot be determined. |
| BaseColumnName | The name of the column in the table or view in the database. This might be different than the column name returned in the ColumnName column if an label 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 database. A null value if the base table name cannot be determined. |
.NET Framework
Version 4.6.2 or later