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# db2_primary_keys

(no version information, might be only in CVS)

db2_primary_keys -- Returns a result set listing primary keys for a table

## 说明

resource db2_primary_keys ( resource connection, string qualifier, string schema, string table-name )

警告
本函数是实验性的。本函数的行为，包括函数名称以及其它任何关于本函数的文档可能会在没有通知的情况下随 PHP 以后的发布而改变。使用本函数风险自担。

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. To match all schemas, pass `NULL` or an empty string.

table-name

  The name of the table. To match all tables in the database, pass `NULL` or an empty string.

## 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()

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