Blockquote when i run my application it's run normally, but when i click the button to add a user to the table,it's run "constructor called" normal but don't work OnUpgrade part code and saw me the errorBlockquote when i run my application it's run n
阅读背景：
数据库。sqlite.sqliteexception;接近“存在类”:语法错误(代码1):在编译时:如果存在类，则删除表。
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