mysql获取当前行数据

CREATE TABLE employees (
    id INT PRIMARY KEY,
    name VARCHAR(100),
    position VARCHAR(100),
    salary DECIMAL(10, 2)
);

DELIMITER //

CREATE PROCEDURE FetchEmployee()
BEGIN
    DECLARE done INT DEFAULT FALSE;
    DECLARE emp_id INT;
    DECLARE emp_name VARCHAR(100);
    DECLARE emp_position VARCHAR(100);
    DECLARE emp_salary DECIMAL(10, 2);

    -- 声明游标
    DECLARE cur CURSOR FOR SELECT id, name, position, salary FROM employees;
    -- 声明结束标志
    DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;

    OPEN cur;

    read_loop: LOOP
        FETCH cur INTO emp_id, emp_name, emp_position, emp_salary;
        IF done THEN
            LEAVE read_loop;
        END IF;
        -- 处理当前行数据
        SELECT emp_id, emp_name, emp_position, emp_salary;
    END LOOP;

    CLOSE cur;
END //

DELIMITER ;

DELIMITER //

CREATE PROCEDURE FetchEmployeeDynamic(IN filter_position VARCHAR(100))
BEGIN
    DECLARE done INT DEFAULT FALSE;
    DECLARE emp_id INT;
    DECLARE emp_name VARCHAR(100);
    DECLARE emp_position VARCHAR(100);
    DECLARE emp_salary DECIMAL(10, 2);

    -- 声明动态游标
    DECLARE cur CURSOR FOR SELECT id, name, position, salary FROM employees WHERE position = filter_position;
    -- 声明结束标志
    DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;

    OPEN cur;

    read_loop: LOOP
        FETCH cur INTO emp_id, emp_name, emp_position, emp_salary;
        IF done THEN
            LEAVE read_loop;
        END IF;
        -- 处理当前行数据
        SELECT emp_id, emp_name, emp_position, emp_salary;
    END LOOP;

    CLOSE cur;
END //

DELIMITER ;