db2_special_columns
(PECL ibm_db2 >= 1.0.0)
db2_special_columns — Returns a result set listing the unique row identifier columns for a table
说明
$connection ,
string $qualifier ,
string $schema ,
string $table_name ,
int $scope ) :
resource
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
NULLor 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. |
参见
- db2_column_privileges() - Returns a result set listing the columns and associated privileges for a table
- db2_columns() - Returns a result set listing the columns and associated metadata for a table
- db2_foreign_keys() - Returns a result set listing the foreign keys for a table
- db2_primary_keys() - Returns a result set listing primary keys for a table
- db2_procedure_columns() - Returns a result set listing stored procedure parameters
- db2_procedures() - Returns a result set listing the stored procedures registered in a database
- db2_statistics() - Returns a result set listing the index and statistics for a table
- db2_table_privileges() - Returns a result set listing the tables and associated privileges in a database
- db2_tables() - Returns a result set listing the tables and associated metadata in a database
