db2_special_columns

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Beschreibung

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.

Parameter Liste

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.

Rückgabewerte

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

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.

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.

Siehe auch

db2_column_privileges()

db2_columns()

db2_foreign_keys()

db2_primary_keys()

db2_procedure_columns()

db2_procedures()

db2_statistics()

db2_table_privileges()

db2_tables()

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