mysql 逐行处理数据

-- 示例：声明游标并逐行处理数据
DELIMITER //
CREATE PROCEDURE process_data()
BEGIN
    DECLARE done INT DEFAULT FALSE;
    DECLARE v_id INT;
    DECLARE v_name VARCHAR(255);
    DECLARE cur CURSOR FOR SELECT id, name FROM your_table;
    DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;

    OPEN cur;

    read_loop: LOOP
        FETCH cur INTO v_id, v_name;
        IF done THEN
            LEAVE read_loop;
        END IF;
        -- 在这里对每条数据进行处理
        -- ...
    END LOOP;

    CLOSE cur;
END //
DELIMITER ;

# 示例：使用Python逐行处理MySQL数据
import mysql.connector

db = mysql.connector.connect(
    host="localhost",
    user="your_user",
    password="your_password",
    database="your_database"
)

cursor = db.cursor(dictionary=True)
cursor.execute("SELECT id, name FROM your_table")

for row in cursor:
    # 在这里对每条数据进行处理
    # ...
    pass

cursor.close()
db.close()