Adding a Column to a SQL Server Table

The SQL Native Client OLE DB provider exposes the ITableDefinition::AddColumn function. This allows consumers to add a column to a SQL Server table.

When you add a column to a SQL Server table, the SQL Native Client OLE DB provider consumer is constrained as follows:

  • If DBPROP_COL_AUTOINCREMENT is VARIANT_TRUE, DBPROP_COL_NULLABLE must be VARIANT_FALSE.
  • If the column is defined by using the SQL Server timestamp data type, DBPROP_COL_NULLABLE must be VARIANT_FALSE.
  • For any other column definition, DBPROP_COL_NULLABLE must be VARIANT_TRUE.

Consumers specify the table name as a Unicode character string in the pwszName member of the uName union in the pTableID parameter. The eKind member of pTableID must be DBKIND_NAME.

The new column name is specified as a Unicode character string in the pwszName member of the uName union in the dbcid member of the DBCOLUMNDESC parameter pColumnDesc. The eKind member must be DBKIND_NAME.

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