mysql 循环条件搜索

DELIMITER //

CREATE PROCEDURE search_and_process_data()
BEGIN
    DECLARE done INT DEFAULT FALSE;
    DECLARE v_id INT;
    DECLARE v_value VARCHAR(255);
    
    -- 假设有一个名为 `my_table` 的表，包含 `id` 和 `value` 列
    DECLARE cur CURSOR FOR SELECT id, value FROM my_table WHERE some_condition;
    DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;
    
    OPEN cur;
    
    read_loop: LOOP
        FETCH cur INTO v_id, v_value;
        
        IF done THEN
            LEAVE read_loop;
        END IF;
        
        -- 在这里执行基于条件的操作
        IF v_value = 'some_value' THEN
            -- 执行某些操作，例如更新或记录日志
            UPDATE my_table SET processed = TRUE WHERE id = v_id;
        END IF;
    END LOOP;
    
    CLOSE cur;
END //

DELIMITER ;

-- 调用存储过程
CALL search_and_process_data();