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odbc_specialcolumns — Retrieves special columns
$odbc,$type,$catalog,$schema,$table,$scope,$nullableRetrieves either the optimal set of columns that uniquely identifies a row in the table, or columns that are automatically updated when any value in the row is updated by a transaction.
odbc
ODBC 连接标识符，详见 odbc_connect()。
type
SQL_BEST_ROWID,
odbc_specialcolumns() returns the
column or columns that uniquely identify each row in the table.
When the type argument is SQL_ROWVER,
odbc_specialcolumns() returns the column or columns in the
specified table, if any, that are automatically updated by the data source
when any value in the row is updated by any transaction.
catalog
The catalog ('qualifier' in ODBC 2 parlance).
schema
The schema ('owner' in ODBC 2 parlance).
table
The table.
scope
The scope, which orders the result set.
One of SQL_SCOPE_CURROW, SQL_SCOPE_TRANSACTION
or SQL_SCOPE_SESSION.
nullable
Determines whether to return special columns that can have a NULL value.
One of SQL_NO_NULLS or SQL_NULLABLE .
Returns an ODBC result identifier or false on
failure.
The result set has the following columns:
SCOPECOLUMN_NAMEDATA_TYPETYPE_NAMECOLUMN_SIZEBUFFER_LENGTHDECIMAL_DIGITSPSEUDO_COLUMN
The result set is ordered by SCOPE.
