mysql数据库批量插百万数据_sql数据库怎样批量添加数据

DELIMITER $
DROP PROCEDURE if EXISTS pro_batch_insert$
CREATE PROCEDURE pro_batch_insert(IN insert_num INT)
BEGIN
    DECLARE i INT DEFAULT 1;
    WHILE i<=insert_num DO
        INSERT INTO admin(username,`password`) VALUES(CONCAT('Rose',i),'666');
        SET i=i+1;
    END WHILE;
END $
CALL pro_batch_insert(100)$

-- 案例1：创建函数，实现传入成绩，如果成绩>90,返回A，如果成绩>80,返回B，如果成绩>60,返回C，否则返回D
CREATE FUNCTION test_case(score FLOAT) RETURNS CHAR
BEGIN
    DECLARE ch CHAR DEFAULT 'A';
    CASE
        WHEN score>90 THEN SET ch='A';
        WHEN score>80 THEN SET ch='B';
        WHEN score>60 THEN SET ch='C';
        ELSE SET ch='D';
    END CASE;
    RETURN ch;
END $
SELECT test_case(56)$

-- 生成随机字符串
DELIMITER $
DROP FUNCTION IF EXISTS `rand_string`;
CREATE FUNCTION `rand_string`(n INT) RETURNS varchar(255) CHARSET utf8
BEGIN
    DECLARE chars_str VARCHAR(100) DEFAULT 'abcdefghijklmnopqrstuvwxyzABCDEFJHIJKLMNOPQRSTUVWXYZ';
    DECLARE return_str VARCHAR(255) DEFAULT '';
    DECLARE i INT DEFAULT 0;
    WHILE i < n DO
        SET return_str =CONCAT(return_str, SUBSTRING(chars_str, FLOOR(1 + RAND() * 52), 1));
        SET i = i + 1;
    END WHILE;
    RETURN return_str;
END $

SELECT rand_string(10) $



-- 生成随机数
DELIMITER $
DROP FUNCTION IF EXISTS `rand_num`;
CREATE FUNCTION `rand_num`() RETURNS int(5)
BEGIN
	DECLARE i INT DEFAULT 0;
	SET i = FLOOR( RAND() * 100 );
    RETURN i;
END $
SELECT rand_num() $


-- 插入随机字符串到表中
DROP TABLE IF EXISTS test_string_content;
CREATE TABLE test_string_content(
                              id INT PRIMARY KEY AUTO_INCREMENT,
                              content VARCHAR(20)
);

DELIMITER $
CREATE PROCEDURE test_randstr_insert(IN insertCount INT)
BEGIN
    DECLARE i INT DEFAULT 1;
    DECLARE str VARCHAR(26) DEFAULT 'abcdefghijklmnopqrstuvwxyz';
    DECLARE startIndex INT; #代表初始索引
    DECLARE len INT; #代表截取的字符长度
    WHILE i<=insertcount DO
        SET startIndex=FLOOR(RAND()*26+1); #代表初始索引，随机范围1-26
        SET len=FLOOR(RAND()*(20-startIndex+1)+1); #代表截取长度，随机范围1-（20- startIndex+1）
        INSERT INTO test_string_content(content) VALUES(SUBSTR(str,startIndex,len));
        SET i=i+1;
    END WHILE;
END $
CALL test_randstr_insert(10)$