create table t_topic( id bigint unsigned auto_increment not null primary key comment 'id', topic_name varchar(50) not null comment '主题名称', create_time datetime default CURRENT_TIMESTAMP comment '创建时间', update_time datetime default CURRENT_TIMESTAMP on update CURRENT_TIMESTAMP comment '创建时间') comment '主题表';
create table t_message( id bigint unsigned auto_increment not null primary key comment 'id', topic_id bigint unsigned not null comment '主题id', message_body text comment '消息内容', create_time datetime default CURRENT_TIMESTAMP comment '创建时间', update_time datetime default CURRENT_TIMESTAMP on update CURRENT_TIMESTAMP comment '创建时间', index idx_create_time(create_time) comment '创建时间索引', index idx_topic(topic_id) comment '主题id索引') comment '消息表';
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