SQLPrimaryKeys Function

Conformance: Version Introduced: ODBC 1.0 Standards Compliance: ODBC

Summary: SQLPrimaryKeys returns the column names that make up the primary key for a table. The driver returns the information as a result set. This function does not support returning primary keys from multiple tables in a single call.

SQLRETURN SQLPrimaryKeys(
     SQLHSTMT     StatementHandle,
     SQLCHAR *     CatalogName,
     SQLSMALLINT     NameLength1,
     SQLCHAR *     SchemaName,
     SQLSMALLINT     NameLength2,
     SQLCHAR *     TableName,
     SQLSMALLINT     NameLength3);

Arguments

StatementHandle: [Input] Statement handle.

CatalogName

[Input] Catalog name. If a driver supports catalogs for some tables but not for others, such as when the driver retrieves data from different DBMSs, an empty string ("") denotes those tables that do not have catalogs. CatalogName cannot contain a string search pattern.

If the SQL_ATTR_METADATA_ID statement attribute is set to SQL_TRUE, CatalogName is treated as an identifier and its case is not significant. If it is SQL_FALSE, CatalogName is an ordinary argument; it is treated literally, and its case is significant. For more information, see Arguments in Catalog Functions.

NameLength1: [Input] Length in characters of *CatalogName.

SchemaName

[Input] Schema name. If a driver supports schemas for some tables but not for others, such as when the driver retrieves data from different DBMSs, an empty string ("") denotes those tables that do not have schemas. SchemaName cannot contain a string search pattern.

If the SQL_ATTR_METADATA_ID statement attribute is set to SQL_TRUE, SchemaName is treated as an identifier and its case is not significant. If it is SQL_FALSE, SchemaName is an ordinary argument; it is treated literally, and its case is not significant.

NameLength2: [Input] Length in characters of *SchemaName.

TableName

[Input] Table name. This argument cannot be a null pointer. TableName cannot contain a string search pattern.

If the SQL_ATTR_METADATA_ID statement attribute is set to SQL_TRUE, TableName is treated as an identifier and its case is not significant. If it is SQL_FALSE, TableName is an ordinary argument; it is treated literally, and its case is not significant.

NameLength3: [Input] Length in characters of *TableName.

Returns

SQL_SUCCESS, SQL_SUCCESS_WITH_INFO, SQL_STILL_EXECUTING, SQL_ERROR, or SQL_INVALID_HANDLE.

Diagnostics

When SQLPrimaryKeys returns SQL_ERROR or SQL_SUCCESS_WITH_INFO, an associated SQLSTATE value can be obtained by calling SQLGetDiagRec with a HandleType of SQL_HANDLE_STMT and a Handle of StatementHandle. The following table lists the SQLSTATE values commonly returned by SQLPrimaryKeys and explains each one in the context of this function; the notation "(DM)" precedes the descriptions of SQLSTATEs returned by the Driver Manager. The return code associated with each SQLSTATE value is SQL_ERROR, unless noted otherwise.

SQLSTATE	Error	Description
01000	General warning	Driver-specific informational message. (Function returns SQL_SUCCESS_WITH_INFO.)
08S01	Communication link failure	The communication link between the driver and the data source to which the driver was connected failed before the function completed processing.
24000	Invalid cursor state	(DM) A cursor was open on the StatementHandle, and SQLFetch or SQLFetchScroll had been called. A cursor was open on the StatementHandle, but SQLFetch or SQLFetchScroll had not been called.
40001	Serialization failure	The transaction was rolled back due to a resource deadlock with another transaction.
40003	Statement completion unknown	The associated connection failed during the execution of this function, and the state of the transaction cannot be determined.
HY000	General error	An error occurred for which there was no specific SQLSTATE and for which no implementation-specific SQLSTATE was defined. The error message returned by SQLGetDiagRec in the *MessageText buffer describes the error and its cause.
HY001	Memory allocation error	The driver was unable to allocate memory required to support execution or completion of the function.
HY008	Operation canceled	Asynchronous processing was enabled for the StatementHandle. The function was called, and before it completed execution, SQLCancel or SQLCancelHandle was called on the StatementHandle. Then the function was called again on the StatementHandle. The function was called, and before it completed execution, SQLCancel or SQLCancelHandle was called on the StatementHandle from a different thread in a multithread application.
HY009	Invalid use of null pointer	(DM) The TableName argument was a null pointer. The SQL_ATTR_METADATA_ID statement attribute was set to SQL_TRUE, the CatalogName argument was a null pointer, and SQLGetInfo with the SQL_CATALOG_NAME information type returns that catalog names are supported. (DM) The SQL_ATTR_METADATA_ID statement attribute was set to SQL_TRUE, and the SchemaName argument was a null pointer.
HY010	Function sequence error	(DM) An asynchronously executing function was called for the connection handle that is associated with the StatementHandle. This asynchronous function was still executing when the SQLPrimaryKeys function was called. (DM) SQLExecute, SQLExecDirect, or SQLMoreResults was called for the StatementHandle and returned SQL_PARAM_DATA_AVAILABLE. This function was called before data was retrieved for all streamed parameters. (DM) An asynchronously executing function (not this one) was called for the StatementHandle and was still executing when this function was called. (DM) SQLExecute, SQLExecDirect, SQLBulkOperations, or SQLSetPos was called for the StatementHandle and returned SQL_NEED_DATA. This function was called before data was sent for all data-at-execution parameters or columns.
HY013	Memory management error	The function call could not be processed because the underlying memory objects could not be accessed, possibly because of low memory conditions.
HY090	Invalid string or buffer length	(DM) The value of one of the name length arguments was less than 0 but not equal to SQL_NTS, and the associated name argument is not a null pointer. The value of one of the name length arguments exceeded the maximum length value for the corresponding name.
HY117	Connection is suspended due to unknown transaction state. Only disconnect and read-only functions are allowed.	For more information about suspended state, see SQLEndTran Function.
HYC00	Optional feature not implemented	A catalog was specified, and the driver or data source does not support catalogs. A schema was specified and the driver or data source does not support schemas. The combination of the current settings of the SQL_ATTR_CONCURRENCY and SQL_ATTR_CURSOR_TYPE statement attributes was not supported by the driver or data source. The SQL_ATTR_USE_BOOKMARKS statement attribute was set to SQL_UB_VARIABLE, and the SQL_ATTR_CURSOR_TYPE statement attribute was set to a cursor type for which the driver does not support bookmarks.
HYT00	Timeout expired	The timeout period expired before the data source returned the requested result set. The timeout period is set through SQLSetStmtAttr, SQL_ATTR_QUERY_TIMEOUT.
HYT01	Connection timeout expired	The connection timeout period expired before the data source responded to the request. The connection timeout period is set through SQLSetConnectAttr, SQL_ATTR_CONNECTION_TIMEOUT.
IM001	Driver does not support this function	(DM) The driver associated with the StatementHandle does not support the function.

Comments

SQLPrimaryKeys returns the results as a standard result set, ordered by TABLE_CAT, TABLE_SCHEM, TABLE_NAME, and KEY_SEQ. For information about how this information might be used, see Uses of Catalog Data.

The following columns have been renamed for ODBC 3.x. The column name changes do not affect backward compatibility because applications bind by column number.

ODBC 2.0 column	ODBC 3.x column
TABLE_QUALIFIER	TABLE_CAT
TABLE_OWNER	TABLE_SCHEM

To determine the actual lengths of the TABLE_CAT, TABLE_SCHEM, TABLE_NAME, and COLUMN_NAME columns, call SQLGetInfo with the SQL_MAX_CATALOG_NAME_LEN, SQL_MAX_SCHEMA_NAME_LEN, SQL_MAX_TABLE_NAME_LEN, and SQL_MAX_COLUMN_NAME_LEN options.

Note
For more information about the general use, arguments, and returned data of ODBC catalog functions, see Catalog Functions.

The following table lists the columns in the result set. Additional columns beyond column 6 (PK_NAME) can be defined by the driver. An application should gain access to driver-specific columns by counting down from the end of the result set rather than specifying an explicit ordinal position. For more information, see Data Returned by Catalog Functions.

Column name	Column number	Data type	Comments
TABLE_CAT (ODBC 1.0)	1	Varchar	Primary key table catalog name; NULL if not applicable to the data source. If a driver supports catalogs for some tables but not for others, such as when the driver retrieves data from different DBMSs, it returns an empty string ("") for those tables that do not have catalogs.
TABLE_SCHEM (ODBC 1.0)	2	Varchar	Primary key table schema name; NULL if not applicable to the data source. If a driver supports schemas for some tables but not for others, such as when the driver retrieves data from different DBMSs, it returns an empty string ("") for those tables that do not have schemas.
TABLE_NAME (ODBC 1.0)	3	Varchar not NULL	Primary key table name.
COLUMN_NAME (ODBC 1.0)	4	Varchar not NULL	Primary key column name. The driver returns an empty string for a column that does not have a name.
KEY_SEQ (ODBC 1.0)	5	Smallint not NULL	Column sequence number in key (starting with 1).
PK_NAME (ODBC 2.0)	6	Varchar	Primary key name. NULL if not applicable to the data source.

Code Example

See SQLForeignKeys.

Related Functions

For information about	See
Binding a buffer to a column in a result set	SQLBindCol Function
Canceling statement processing	SQLCancel Function
Fetching a block of data or scrolling through a result set	SQLFetchScroll Function
Fetching a single row or a block of data in a forward-only direction	SQLFetch Function
Returning the columns of foreign keys	SQLForeignKeys Function
Returning table statistics and indexes	SQLStatistics Function

Concepts

ODBC Header Files

Other Resources

ODBC API Reference