DBCursorNext

DBCursorNext moves the cursor to the next row in a SQL result set and then copies that row's values to the mapped tags. If there is no next row — that is, if the current row is the last — the function returns an error code and doesn't change the mapped tags.

Syntax

DBCursorNext(numCur, "optStrErrorTag")

numCur

The cursor handle for the result set, which was returned by DBCursorOpen or DBCursorOpenSQL.

optStrErrorTag

The name of a project tag that will receive detailed error messages, if errors occur during project run time.

Note: If this parameter is enclosed in quotes, the string literal will be used. Otherwise, the value of the tag/expression will be used.

This parameter is optional.

Return value

In the case of success, this function returns 0.

In the case of error, this function returns one of the following possible values:

Notes

Database/ERP functions emulate Structured Query Language (SQL) database operations. Before you use these functions, familiarize yourself with how SQL statements are formed and executed.

This function recognizes only 16000 rows of a table at one time. If a selected section of table has more than 16000 rows, only the first 16000 rows of the selection will be accessible to any built-in language Database/ERP functions. Exceeding this limit may return an EOF error even if the end of the file has not been reached.

When this function is used in a project running on IoT View, it supports only single-byte Unicode characters (up to U+007F). Multi-byte Unicode characters are not supported at this time.

You can use the Database Gateway (StADOSvr) to directly monitor database connections for leaks and errors. For more information, see Database Interface.

Examples

DBCursorNext(nCursor)

DBCursorNext(nCursor, "TagError")