Collaboration diagram for Update Functions:

Functions
RDM_RETCODE	rdm_dbAlterCatalog (RDM_DB db, const char *ddlStmt)
	Process a schema DDL command. More...

Detailed Description

Schema API for altering the schema. All the functions here are located in RDM DB Engine Library. Linker option:

    -lrdmrdm

Function Documentation

◆ rdm_dbAlterCatalog()

RDM_RETCODE rdm_dbAlterCatalog	(	RDM_DB	db,
		const char *	ddlStmt
	)

#include <rdmdbapi.h>

Process a schema DDL command.

This function processes a schema DDL (data definition language) command

The DDL commands allow for modifying the format and structure of a database. This function can be used to create a new database or to alter the structure of an existing database. The use of this function requires exclusive access to the schema. This can be gained by issuing a call to rdm_dbStartUpdate() with the schema (RDM_LOCK_SCHEMA) as one of the tables to write lock.

The changes made to the schema will be visible locally immediately, but will not be made available to other sessions until the transaction has been committed. If the transaction is aborted then the database structure will be unchanged.

Locking Requirements: Write lock on the schema (RDM_LOCK_SCHEMA)

Return values

sOKAY	Normal, successful return.
eNOSTARTUPDATE	An update operation was attempted when no rdm_dbStartUpdate() is active.
eNOTLOCKED	Attempt to access a table for reading or update without proper locks.
eDDL_ALTERACT	Invalid ALTER action spec.
eDDL_CONSTRNOTFOUND	Constraint not found.
eDDL_DROPNOTNULL	Cannot DROP NOT NULL: column is not defined as NOT NULL.
eDDL_DUPTABNAME	Duplicate table name.
eDDL_NULLCONFLICT	NOT NULL constraint specified for a column that has NULL values or a NULL default value.
eSYNTAX	Syntax error.
eINVFORUNION	Invalid operation on unioned db.
ePRECOMMITTED	A precommitted transaction must be committed or rolled back before further operations on this database are allowed.
eREADONLY	Database is read-only and cannot be updated.

See also: rdm_dbStartUpdate; rdm_dbSetCatalog; rdm_dbEnd; DDL User Guide

Parameters

[in]	db	A valid RDM database handle
[in]	ddlStmt	The ddl statement to execute