Cursor Declaration
Before using a cursor in an application, the cursor must be declared. The syntax for declaring a cursor is:
EXEC SQL DECLARE cursor_name CURSOR FOR
select_statement;
The DECLARE CURSOR statement assigns a name to the cursor and associates the cursor with a SELECT statement to be used to retrieve data. A cursor is always associated with a SELECT statement. The select is executed when the cursor is opened. Updates can be performed only if the cursor SELECT statement refers to a single table (or updatable view) and does not include any of the following elements:
• Aggregate functions
• DISTINCT
• GROUP By clause
• HAVING clause
• ORDER BY clause
• UNION clause
These elements can be present in subselects within the SELECT statement, but must not occur in the outermost SELECT statement.
The cursor_name can be specified using a string literal or a host language string variable. The cursor name cannot exceed 32 bytes and can be assigned dynamically. For details, see
Summary of Cursor Positioning.
Last modified date: 08/14/2024