DBCursorPrevious

Moves the cursor to the previous row of the result set and copies that row's values to the mapped tags. If there is no previous row — that is, If the current row is the first — then the function returns an error code and doesn't change the mapped tags.

Function	Group	Execution	Windows	Embedded	Thin Client
DBCursorPrevious	Database/ERP	Synchronous	Supported	Supported	Supported

Note: This feature emulates SQL (Structured Query Language) database operations. You should be familiar with how SQL commands are formed and executed before you use this feature.

Syntax

DBCursorPrevious( numCur, "optStrErrorTag" )

numCur: The cursor handle of the result set. The cursor handle is returned by DBCursorOpen or DBCursorOpenSQL.
optStrErrorTag: The name of a String tag that will receive detailed error messages, if errors occur during runtime.
Note: The tag name must be enclosed in quotes, as shown in the syntax diagram, or else the project will try to get the value of the named tag.

This is an optional parameter.

Returned value

In case of error, returns a negative number. Otherwise, returns 0.

Examples

As used in a Math worksheet:

Tag Name	Expression
`nErrorCode`	`DBCursorPrevious( nCursor )`