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

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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