Функции PHP »»» Функции IBM DB2, Cloudscape и Apache Derbydb2_special_columns (no version information, might be only in CVS) db2_special_columns --
Returns a result set listing the unique row identifier columns for a table
Описаниеresource db2_special_columns ( resource connection, string qualifier, string schema, string table_name, int scope )
Returns a result set listing the unique row identifier columns for a table.
Список параметров
- connection
A valid connection to an IBM DB2, Cloudscape, or Apache Derby database.
- qualifier
A qualifier for DB2 databases running on OS/390 or z/OS servers. For
other databases, pass NULL or an empty string.
- schema
The schema which contains the tables.
- table_name
The name of the table.
- scope
Integer value representing the minimum duration for which the
unique row identifier is valid. This can be one of the following
values:
| Integer value | SQL constant | Description |
|---|
| 0 | SQL_SCOPE_CURROW | Row identifier is valid only while the cursor is positioned
on the row. | | 1 | SQL_SCOPE_TRANSACTION | Row identifier is valid for the duration of the
transaction. | | 2 | SQL_SCOPE_SESSION | Row identifier is valid for the duration of the
connection. |
Возвращаемые значения
Returns a statement resource with a result set containing rows with unique
row identifier information for a table. The rows are composed of the
following columns:
| Column name | Description |
|---|
| SCOPE |
| Integer value | SQL constant | Description | | 0 | SQL_SCOPE_CURROW | Row identifier is valid only while the cursor is positioned
on the row. | | 1 | SQL_SCOPE_TRANSACTION | Row identifier is valid for the duration of the
transaction. | | 2 | SQL_SCOPE_SESSION | Row identifier is valid for the duration of the
connection. |
| | COLUMN_NAME | Name of the unique column. | | DATA_TYPE | SQL data type for the column. | | TYPE_NAME | Character string representation of the SQL data type for the
column. | | COLUMN_SIZE | An integer value representing the size of the column. | | BUFFER_LENGTH |
Maximum number of bytes necessary to store data from this column.
| | DECIMAL_DIGITS |
The scale of the column, or NULL where scale is not applicable.
| | NUM_PREC_RADIX |
An integer value of either 10 (representing
an exact numeric data type), 2 (representing an
approximate numeric data type), or NULL (representing a data type for
which radix is not applicable).
| | PSEUDO_COLUMN | Always returns 1. |
|
