ITEEDU

PHP 手册
后退前进


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:

Integer valueSQL constantDescription
0SQL_SCOPE_CURROWRow identifier is valid only while the cursor is positioned on the row.
1SQL_SCOPE_TRANSACTIONRow identifier is valid for the duration of the transaction.
2SQL_SCOPE_SESSIONRow 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 nameDescription
SCOPE

Integer valueSQL constantDescription
0SQL_SCOPE_CURROWRow identifier is valid only while the cursor is positioned on the row.
1SQL_SCOPE_TRANSACTIONRow identifier is valid for the duration of the transaction.
2SQL_SCOPE_SESSIONRow identifier is valid for the duration of the connection.

COLUMN_NAMEName of the unique column.
DATA_TYPESQL data type for the column.
TYPE_NAMECharacter string representation of the SQL data type for the column.
COLUMN_SIZEAn 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_COLUMNAlways 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()



后退起点前进
db2_rollback上一级db2_statistics