Retrieves special columns

# odbc_specialcolumns

(PHP 4, PHP 5, PHP 7, PHP 8)

odbc_specialcolumns — Retrieves special columns

### 说明

function odbc_specialcolumns(
Odbc\Connection `$odbc`,
int `$type`,
?string `$catalog`,
string `$schema`,
string `$table`,
int `$scope`,
int `$nullable`
): Odbc\Result|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 连接对象，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

返回 ODBC 结果对象 或者在失败时返回 `false`。

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`.

### 更新日志

版本 | 说明
--- | ---
8.4.0 | `odbc` 现在需要 Odbc\Connection 实例；之前需要 resource。
8.4.0 | 此函数现在返回 Odbc\Result 实例；之前返回 resource。

### 参见

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

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