How to manually obtain the auto-increment primary key in MySql-Mysql Tutorial-php.cn

Mysql method to manually obtain the auto-increment primary key: Maintain a sequences table to obtain data by creating a stored procedure and adding a function. The code is [last_number = last_number increment_by].

How to manually obtain the auto-increment primary key in MySql

Mysql method to manually obtain the auto-increment primary key:

By creating a stored procedure plus Maintain a sequence table to obtain data in a functional way (solve it once and use it for life).
You can specify the size of each increment and the initial number.

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;

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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;

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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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