Implement nextval functions in mysql similar to those in oracle

Mysql implements functions similar to nextval in oracle. We know that sequence is not supported in mysql. Generally, this field is auto-incrementing by the table creation time. Www.2cto.com such as create table table_name (id int auto_increment primary key ,...); or alter table table_ame add id int auto_increment primary key // field, it must be set to primary key or reset the starting value of the auto-increment field alter table table_name AUTO_INCREMENT = n. However, sequence_name.nextval is often used in oracle, or in the program, we use select sequence_name.value from dual. if our development framework must support both oracle and mysql. We generally propose sequence. If a similar function is provided in mysql, it is more convenient to propose it. This is an application scenario. The following describes how to implement a nextval function in mysql. Create table SQL code CREATE TABLE 'sys _ sequence '('name' varchar (50) NOT NULL, 'current _ value' int (11) not null default '0', 'credentials' int (11) not null default '1', primary key ('name') 2. then CREATE the FUNCTION www.2cto.com SQL code DELIMITER $ DROP FUNCTION IF EXISTS 'currval' $ CREATE DEFINER = 'root' @ '% 'function' currval' (seq_name VARCHAR (50 )) returns int (11) begin declare value integer; set value = 0; SEL ECT current_value into value from sys_sequence where name = seq_name; return value; END $ DELIMITER; create definer = 'root' @ '% 'function' nextval' (seq_name varchar (50 )) RETURNS int (11) begin update sys_sequence SET CURRENT_VALUE = CURRENT_VALUE + INCREMENT where name = seq_name; return currval (seq_name ); end create definer = 'root' @ '% 'function' setval' (seq_name varchar (50), value integer) RETURNS int (11) BEGIN update sys_sequence set current_value = value where name = seq_name; return currval (seq_name); END? Test select nextval ('name.