Php/docs/function.db2-special-columns

• PHP Manual
• IBM DB2 函数
• Returns a result set listing the unique row identifier columns for a table

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

db2_special_columns ( resource $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 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.

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	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.

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