需要向数据库添加100W条测试数据，直接在普通表中添加速度太慢，可以使用内存表添加，然后将内存表数据复制到普通表

创建表

# 内存表
DROP TABLE IF EXISTS `test_memory`;
CREATE TABLE `test_page_memory`  (
  `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;

# 普通表
DROP TABLE IF EXISTS `test`;
CREATE TABLE `test_page`  (
  `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;

编写函数

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

编写存储过程

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

执行

# 调用存储过程
CALL add_data(1000000);
# 将内存表数据复制到普通表
INSERT INTO test SELECT * FROM test_memory;

结果

可以看到添加数据一共只花了6分钟左右。

标签：SET,DEFAULT,utf8,添加,百万条,str,MySQL,test,NULL
来源： https://www.cnblogs.com/nwgdk/p/10889985.html