db2_special_columns
(PECL ibm_db2:1.0-1.6.2)
db2_special_columns — Returns a result set listing the unique row identifier columns for a table
说明
Returns a result set listing the unique row identifier columns for a table.
参数
- 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.
返回值
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. | ||||||||||||
| 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. |
CDN