mysql 8.0.19版本，为什么数值类型的字段，字段长度无法修改呢，一直是0

原因分析：

根据告警的提示信息指出：integer的宽度显示将在未来版本被移除

查阅官网资料如下： 官网相关资料：

MySQL Server 8.0.17 deprecated the display width for the TINYINT, SMALLINT, MEDIUMINT, INT, and BIGINT data types when the ZEROFILL modifier is not used, and MySQL Server 8.0.19 has removed the display width for those data types from results of SHOW CREATE TABLE, SHOW CREATE FUNCTION, and queries on INFORMATION_SCHEMA.COLUMNS, INFORMATION_SCHEMA.ROUTINES, and INFORMATION_SCHEMA.PARAMETERS (except for the display width for signed TINYINT(1)). This patch adjusts Connector/J to those recent changes of MySQL Server and, as a result, DatabaseMetaData, ParameterMetaData, and ResultSetMetaData now report identical results for all the above-mentioned integer types and also for the FLOAT and DOUBLE data types. (Bug #30477722)

根据官网资料可知：从8.0.17版本开始，TINYINT, SMALLINT, MEDIUMINT, INT, and BIGINT类型的显示宽度将失效。

建议 show create table table_name \G 看一下。

尝试 通过 DDL alter 语句尝试修改下。

顶一下，期望大神出现