db2_special_columns
(PECL)
db2_special_columns -- Returns a result set listing the unique row identifier columns for a table说明
resource 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.
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:
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. |
参见
| db2_column_privileges() |
| db2_columns() |
| db2_foreign_keys() |
| db2_primary_keys() |
| db2_procedure_columns() |
| db2_procedures() |
| db2_statistics() |
| db2_table_privileges() |
| db2_tables() |