![](https://img.laitimes.com/img/__Qf2AjLwojIjJCLyojI0JCLiAzNfRHLGZkRGZkRfJ3bs92YsYTMfVmepNHL2ZFShBnVXJGcoJzY2R2MMBjVtJWd0ckW65UbM5WOHJWa5kHT20ESjBjUIF2X0hXZ0xCMx81dvRWYoNHLrdEZwZ1Rh5WNXp1bwNjW1ZUba9VZwlHdssmch1mclRXY39CXldWYtlWPzNXZj9mcw1ycz9WL49zZuBnL0EjNyMDN1kDMxAjNwAjMwIzLc52YucWbp5GZzNmLn9Gbi1yZtl2Lc9CX6MHc0RHaiojIsJye.png)
none: Disable DDl handling (禁用ddl,不做任何操作)
create: Create the schema and destroy previous data (建立架構并銷毀先前的資料)-建表,有資料清空表
create-drop: Create and then destroy the schema at the end of the session (在會話結束時建立然後銷毀架構)–程式結束清空表
update: Update the schema if necessary (必要時更新架構 )–隻更新表結構,不更新資料
validate: Validate the schema, make no changes to the database (驗證架構,不對資料庫進行任何更改)–驗證錯誤會報錯