显示所有库: show databases;
创建库: create database [if not exists] db_name;
显示库创建信息: show create database db_name;
删除库: drop database [if exists] db_name;
切换当前数据库: use db_name;
显示所有库: show databases;
创建库: create database [if not exists] db_name;
显示库创建信息: show create database db_name;
删除库: drop database [if exists] db_name;
切换当前数据库: use db_name;