MDAC 2.5 SDK - ODBC Programmer's Reference
Chapter 21: ODBC API Reference

SQLProcedureColumns

Conformance

Version Introduced: ODBC 1.0
Standards Compliance: ODBC

Summary

SQLProcedureColumns returns the list of input and output parameters, as well as the columns that make up the result set for the specified procedures. The driver returns the information as a result set on the specified statement.

Syntax

SQLRETURN SQLProcedureColumns(
     SQLHSTMT     StatementHandle,
     SQLCHAR *     CatalogName,
     SQLSMALLINT     NameLength1,
     SQLCHAR *     SchemaName,
     SQLSMALLINT     NameLength2,
     SQLCHAR *     ProcName,
     SQLSMALLINT     NameLength3,
     SQLCHAR *     ColumnName,
     SQLSMALLINT     NameLength4);

Arguments

StatementHandle

[Input]
Statement handle.

CatalogName

[Input]
Procedure catalog name. If a driver supports catalogs for some procedures but not for others, such as when the driver retrieves data from different DBMSs, an empty string ("") denotes those procedures 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" in Chapter 7, "Catalog Functions."

NameLength1

[Input]
Length of *CatalogName.

SchemaName

[Input]
String search pattern for procedure schema names. If a driver supports schemas for some procedures but not for others, such as when the driver retrieves data from different DBMSs, an empty string ("") denotes those procedures that do not have schemas.

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 a pattern value argument; it is treated literally, and its case is significant.

NameLength2

[Input]
Length of *SchemaName.

ProcName

[Input]
String search pattern for procedure names.

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

NameLength3

[Input]
Length of *ProcName.

ColumnName

[Input]
String search pattern for column names.

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

NameLength4

[Input]
Length of *ColumnName.

Returns

SQL_SUCCESS, SQL_SUCCESS_WITH_INFO, SQL_STILL_EXECUTING, SQL_ERROR, or SQL_INVALID_HANDLE.

Diagnostics

When SQLProcedureColumns 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 SQLProcedureColumns 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.

Comments

This function is typically used before statement execution to retrieve information about procedure parameters and the columns that make up the result set or sets returned by the procedure, if any. For more information, see "Procedures" in Chapter 9, "Executing Statements."

Note   SQLProcedureColumns might not return all columns used by a procedure. For example, a driver might return only information about the parameters used by a procedure and not the columns in a result set it generates.

The SchemaName, ProcName, and ColumnName arguments accept search patterns. For more information about valid search patterns, see "Pattern Value Arguments" in Chapter 7, "Catalog Functions."

Note   For more information about the general use, arguments, and returned data of ODBC catalog functions, see Chapter 7, "Catalog Functions."

SQLProcedureColumns returns the results as a standard result set, ordered by PROCEDURE_CAT, PROCEDURE_SCHEM, PROCEDURE_NAME, and COLUMN_TYPE. Column names are returned for each procedure in the following order: the name of the return value, the names of each parameter in the procedure invocation (in call order), and then the names of each column in the result set returned by the procedure (in column order).

Applications should bind driver-specific columns relative to the end of the result set. For more information, see "Data Returned by Catalog Functions" in Chapter 7, "Catalog Functions."

To determine the actual lengths of the PROCEDURE_CAT, PROCEDURE_SCHEM, PROCEDURE_NAME, and COLUMN_NAME columns, an application can call SQLGetInfo with the SQL_MAX_CATALOG_NAME_LEN, SQL_MAX_SCHEMA_NAME_LEN, SQL_MAX_PROCEDURE_NAME_LEN, and SQL_MAX_COLUMN_NAME_LEN options.

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.

The following columns have been added to the results set returned by SQLProcedureColumns for ODBC 3.x:

• COLUMN_DEF
  
  
• DATETIME_CODE
  
  
• CHAR_OCTET_LENGTH
  
  
• ORDINAL_POSITION
  
  
• IS_NULLABLE

The following table lists the columns in the result set. Additional columns beyond column 19 (IS_NULLABLE) 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" in Chapter 7, "Catalog Functions."

Code Example

See "Procedure Calls" in Chapter 8, "SQL Statements."

Related Functions