MySQL学习记录

一、MySQL安装

链接 https://www.cnblogs.com/duanrantao/p/8988116.html

        https://www.cnblogs.com/jessica-test/p/9047431.html

二、MySQL语法

三、MySQL应用

1、mysql插入大数据（100W+）-存储过程

（链接--https://www.cnblogs.com/nwgdk/p/10889985.html）

方法：内存表添加->内存表数据复制到普通表

步骤：

A # 内存表

DROP TABLE IF EXISTS `t_name_memory_table`;

CREATE TABLE `t_name_memory_table` (

  `id` int(11) NOT NULL AUTO_INCREMENT,

  `username` varchar(20) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,

  `password` varchar(100) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,

  `create_time` datetime(0) NULL DEFAULT NULL,

  `update_time` datetime(0) NULL DEFAULT NULL, PRIMARY KEY (`id`) USING HASH

) ENGINE = MEMORY AUTO_INCREMENT = 1000001 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Fixed STORAGE MEMORY;

SET FOREIGN_KEY_CHECKS = 1;

B # 普通

DROP TABLE IF EXISTS `t_name_table`;

CREATE TABLE `t_name_table` (

  `id` int(11) NOT NULL AUTO_INCREMENT,

  `username` varchar(20) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,

  `password` varchar(100) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,

  `create_time` datetime(0) NULL DEFAULT NULL, `update_time` datetime(0) NULL DEFAULT NULL, PRIMARY KEY (`id`) USING BTREE

) ENGINE = InnoDB AUTO_INCREMENT = 1000001 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;

SET FOREIGN_KEY_CHECKS = 1;

C #函数

CREATE DEFINER=`root`@`localhost` FUNCTION `rand_str`(n INT) RETURNS varchar(255) CHARSET utf8

BEGIN

    DECLARE i INT DEFAULT 0;

    DECLARE char_str VARCHAR(255) DEFAULT 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';

    DECLARE return_str VARCHAR(255) DEFAULT '';

    WHILE i < n DO

        SET return_str = CONCAT(return_str,substring(char_str, FLOOR(1 + RAND()*62), 1));

        SET i = i + 1;

    END WHILE;

    RETURN return_str;

END

D #存储过程

CREATE DEFINER=`root`@`localhost` PROCEDURE `add_data`(IN `n` int)

BEGIN

    DECLARE i INT DEFAULT 0;

    WHILE i < n DO

        INSERT INTO test_memory(username,`password`,create_time,update_time) VALUES (rand_str(8),MD5('123456'),NOW(),NOW());

        SET i = i + 1;

    END WHILE;

END

E #插入数据eg.

  -- 调用存储过程

     CALL add_data(1000000);

  -- 将内存表数据复制到普通表

     INSERT INTO t_name_tableSELECT * FROM t_name_memory_table;