MySql如何手动获取自增主键

mysql手动获取自增主键的方法：通过创建存储过程外加函数的方式维护一张sequences表来获取数据，代码为【last_number = last_number + increment_by】。

mysql手动获取自增主键的方法：

• 通过创建存储过程外加函数的方式维护一张sequences表来获取数据（一次解决终身受用）。

• 可以指定每次自增的大小，以及初始数。

select nextval('TESTDATA') AS batchId CREATE DEFINER=`admin`@`%` FUNCTION `nextval`(seq_name VARCHAR (50)) RETURNS bigint(20) BEGIN   UPDATE     SEQUENCES   SET     last_number = last_number + increment_by   WHERE sequence_name = seq_name;   RETURN currval (seq_name); END;

CREATE DEFINER=`admin`@`%` FUNCTION `currval`(seq_name VARCHAR (50)) RETURNS bigint(20)     NO SQL BEGIN      SELECT     last_number INTO @VALUE   FROM     SEQUENCES   WHERE sequence_name = seq_name;   RETURN @VALUE; END;

DROP TABLE IF EXISTS `sequences`; CREATE TABLE `sequences`  (   `sequence_owner` varchar(30) CHARACTER SET utf8mb4 COLLATE utf8mb4_bin NOT NULL,   `sequence_name` varchar(30) CHARACTER SET utf8mb4 COLLATE utf8mb4_bin NOT NULL,   `min_value` bigint(20) NULL DEFAULT 1,   `max_value` bigint(20) NULL DEFAULT NULL,   `increment_by` bigint(20) NOT NULL DEFAULT 1,   `cycle_flag` varchar(1) CHARACTER SET utf8mb4 COLLATE utf8mb4_bin NULL DEFAULT NULL,   `order_flag` varchar(1) CHARACTER SET utf8mb4 COLLATE utf8mb4_bin NULL DEFAULT NULL,   `cache_size` bigint(20) NOT NULL,   `last_number` bigint(20) NOT NULL,   PRIMARY KEY (`sequence_name`) USING BTREE,   UNIQUE INDEX `sel`(`sequence_owner`, `sequence_name`) USING BTREE ) ENGINE = InnoDB CHARACTER SET = utf8mb4 COLLATE = utf8mb4_bin ROW_FORMAT = Compact;   -- ---------------------------- -- Records of sequences -- ---------------------------- INSERT INTO `sequences` VALUES ('SCM', 'TESTDATA', 1, 9999999999, 1, 'N', 'Y', 20, 0); INSERT INTO `sequences` VALUES ('SCM', 'SEQ', 1, 9999999999, 1, 'N', 'N', 20, 0);   SET FOREIGN_KEY_CHECKS = 1;

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