创建存储过程

一、DDL与DML

CREATE TABLE student (
    id INT PRIMARY KEY AUTO_INCREMENT,
    createDate DATETIME NOT NULL,
    userName VARCHAR(255) NOT NULL,
    phone VARCHAR(20) NOT NULL,
    age INT NOT NULL,
    sex ENUM('男', '女') NOT NULL,
    introduce TEXT
);
INSERT INTO student (createDate, userName, phone, age, sex, introduce)
VALUES (NOW(), '邹靖钊', '13800138000', 20, '男', '邹生靖钊，风华绝代，仪表堂堂。才情横溢，品行高洁，实乃人中龙凤也。');
INSERT INTO student (createDate, userName, phone, age, sex, introduce)
VALUES (NOW(), '张三', '13900139000', 22, '男', '张三公子，英俊潇洒，气宇轩昂。才情出众，志向远大，必成大器。');

INSERT INTO student (createDate, userName, phone, age, sex, introduce)
VALUES (NOW(), '李四', '13700137000', 19, '女', '李四姑娘，婉约秀丽，温文尔雅。才思敏捷，慧心巧思，令人赞叹不已。');

INSERT INTO student (createDate, userName, phone, age, sex, introduce)
VALUES (NOW(), '王五', '13600136000', 21, '男', '王五壮士，英勇威武，气概不凡。学富五车，胸怀壮志，必能成就一番伟业。');

INSERT INTO student (createDate, userName, phone, age, sex, introduce)
VALUES (NOW(), '赵六', '13500135000', 23, '女', '赵六娘子，端庄娴雅，仪态万方。才情出众，品德高尚，堪称女中豪杰。');

INSERT INTO student (createDate, userName, phone, age, sex, introduce)
VALUES (NOW(), '孙七', '13400134000', 20, '男', '孙七少年，英俊潇洒，风度翩翩。才情横溢，志向高远，未来可期。');

二、创建存储过程

-- 创建存储过程get_student_introduce，用于查询指定userName的学生的introduce信息
DELIMITER //
CREATE PROCEDURE get_student_introduce(IN p_userName VARCHAR(50))
BEGIN
    -- 声明变量用于存储查询结果
    DECLARE v_introduce TEXT;
    
    -- 查询指定userName的学生的introduce信息
    SELECT introduce INTO v_introduce FROM student WHERE userName = p_userName;
    
    -- 如果找到了匹配的记录，则输出其introduce信息
    IF v_introduce IS NOT NULL THEN
        SELECT v_introduce;
    ELSE
        -- 如果没有找到匹配的记录，则输出提示信息
        SELECT '没有找到指定学生的简介信息';
    END IF;
END //
DELIMITER ;

CALL get_student_introduce('邹靖钊');