The following table lists system functions that are included in the ODBC scalar function set. By calling SQLGetInfo with an information type of SQL_SYSTEM_FUNCTIONS, an application can determine which system functions are supported by a driver.
Arguments denoted as exp can be the name of a column, the result of another scalar function, or a literal, where the underlying data type could be represented as SQL_NUMERIC, SQL_DECIMAL, SQL_TINYINT, SQL_SMALLINT, SQL_INTEGER, SQL_BIGINT, SQL_FLOAT, SQL_REAL, SQL_DOUBLE, SQL_TYPE_DATE, SQL_TYPE_TIME, or SQL_TYPE_TIMESTAMP.
Arguments denoted as value can be a literal constant, where the underlying data type can be represented as SQL_NUMERIC, SQL_DECIMAL, SQL_TINYINT, SQL_SMALLINT, SQL_INTEGER, SQL_BIGINT, SQL_FLOAT, SQL_REAL, SQL_DOUBLE, SQL_TYPE_DATE, SQL_TYPE_TIME, or SQL_TYPE_TIMESTAMP.
Values returned are represented as ODBC data types.
DATABASE( ) (ODBC 1.0)
Returns the name of the database corresponding to the connection handle. (The name of the database is also available by calling SQLGetConnectOption with the SQL_CURRENT_QUALIFIER connection option.)
IFNULL(exp,value) (ODBC 1.0)
If exp is null, value is returned. If exp is not null, exp is returned. The possible data type or types of value must be compatible with the data type of exp.
USER( ) (ODBC 1.0)
Returns the user name in the DBMS. (The user name is also available by way of SQLGetInfo by specifying the information type: SQL_USER_NAME.) This can be different than the login name.