<= MariaDB 10.2
DECLARE cursor_name CURSOR FOR select_statement
From MariaDB 10.3
DECLARE cursor_name [(cursor_formal_parameter[,...])] CURSOR FOR select_statement; cursor_formal_parameter: name type [collate clause]
This statement declares a cursor. Multiple cursors may be declared in a stored program, but each cursor in a given block must have a unique name.
select_statement
is not executed until the OPEN statement is executed. It is important to remember this if the query produces an error, or calls functions which have side effects.
A SELECT
associated to a cursor can use variables, but the query itself cannot be a variable, and cannot be dynamically composed. The SELECT
statement cannot have an INTO
clause.
Cursors must be declared before HANDLER
s, but after local variables and CONDITION
s.
See Cursor Overview for an example.
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https://mariadb.com/kb/en/declare-cursor/