db2_primary_keys
说明
resource db2_primary_keys ( resource connection, string qualifier, string schema, string table-name )Returns a result set listing the primary keys 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. If schema is NULL, db2_primary_keys() matches the schema for the current connection.
- table-name
The name of the table.
返回值
Returns a statement resource with a result set containing rows describing the primary keys for the specified table. The result set is composed of the following columns:
| Column name | Description |
|---|---|
| TABLE_CAT | Name of the catalog for the table containing the primary key. The value is NULL if this table does not have catalogs. |
| TABLE_SCHEM | Name of the schema for the table containing the primary key. |
| TABLE_NAME | Name of the table containing the primary key. |
| COLUMN_NAME | Name of the column containing the primary key. |
| KEY_SEQ | 1-indexed position of the column in the key. |
| PK_NAME | The name of the primary key. |
参见
| db2_column_privileges() |
| db2_columns() |
| db2_foreign_keys() |
| db2_procedure_columns() |
| db2_procedures() |
| db2_special_columns() |
| db2_statistics() |
| db2_table_privileges() |
| db2_tables() |