Cannot perform this operation because there is no current transaction(不能执行此操作,因为没有当前事务。)
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db.endTransaction(); 时,添加判断 db!= bull 并且 db.inTransaction();
if(db != null && db.inTransaction()){
db.endTransaction();}
参考链接:https://stackoverflow.com/questions/26331362/java-lang-illegalstateexception-cannot-perform-this-operation-because-there-is
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