Php/docs/function.odbc-specialcolumns
来自菜鸟教程
odbc_specialcolumns
(PHP 4, PHP 5, PHP 7)
odbc_specialcolumns — Retrieves special columns
说明
odbc_specialcolumns
( resource $connection_id
, int $type
, string $catalog
, string $schema
, string $table
, int $scope
, int $nullable
) : resource
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
connection_id
- 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 isSQL_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
orSQL_SCOPE_SESSION
. nullable
- Determines whether to return special columns that can have a NULL value. One of
SQL_NO_NULLS
orSQL_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
.