(PECL ibm_db2 >= 1.0.0)
db2_special_columns — Returns a result set listing the unique row identifier columns for a table
$connection
, string $qualifier
, string $schema
, string $table_name
, int $scope
)Returns a result set listing the unique row identifier columns for a table.
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. |
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 |
|
||||||||||||
| 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.
|
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| 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).
|
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| PSEUDO_COLUMN | Always returns 1. |