Retrieves special columns

说明

odbc_specialcolumns ( resource $odbc , int $type , string|null $catalog , string $schema , string $table , int $scope , int $nullable ) : resource|false

Retrieves 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.

参数

odbc: ODBC 连接标识符，详见 odbc_connect()。
type: When the type argument is 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 .

返回值

Returns an ODBC result identifier or false on failure.

The result set has the following columns:

SCOPE
COLUMN_NAME
DATA_TYPE
TYPE_NAME
COLUMN_SIZE
BUFFER_LENGTH
DECIMAL_DIGITS
PSEUDO_COLUMN

Drivers can report additional columns.

The result set is ordered by SCOPE.

参见

odbc_tables() - Get the list of table names stored in a specific data source