问题描述
我正在使用Django 3.1将一些中间件迁移到新的Django代码库。
我显然使用的是020-09-14T15:00:32.411104974Z: [ERROR] Caused by: com.MysqL.jdbc.exceptions.jdbc4.MysqLNonTransientConnectionException: Got packets out of order
2020-09-14T15:00:32.411109175Z: [ERROR] at sun.reflect.GeneratedConstructorAccessor39.newInstance(UnkNown Source)
2020-09-14T15:00:32.411119776Z: [ERROR] at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
2020-09-14T15:00:32.411123976Z: [ERROR] at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
2020-09-14T15:00:32.411127976Z: [ERROR] at com.MysqL.jdbc.Util.handleNewInstance(Util.java:411)
2020-09-14T15:00:32.411131977Z: [ERROR] at com.MysqL.jdbc.Util.getInstance(Util.java:386)
2020-09-14T15:00:32.411135977Z: [ERROR] at com.MysqL.jdbc.sqlError.createsqlException(sqlError.java:1013)
2020-09-14T15:00:32.411140077Z: [ERROR] at com.MysqL.jdbc.MysqLIO.checkerrorPacket(MysqLIO.java:3609)
2020-09-14T15:00:32.411144077Z: [ERROR] at com.MysqL.jdbc.MysqLIO.checkerrorPacket(MysqLIO.java:3541)
2020-09-14T15:00:32.411148078Z: [ERROR] at com.MysqL.jdbc.MysqLIO.sendCommand(MysqLIO.java:2002)
2020-09-14T15:00:32.411152078Z: [ERROR] at com.MysqL.jdbc.MysqLIO.sqlQueryDirect(MysqLIO.java:2163)
2020-09-14T15:00:32.411156178Z: [ERROR] at com.MysqL.jdbc.ConnectionImpl.execsql(ConnectionImpl.java:2618)
2020-09-14T15:00:32.411160379Z: [ERROR] at com.MysqL.jdbc.ConnectionImpl.execsql(ConnectionImpl.java:2568)
2020-09-14T15:00:32.411164379Z: [ERROR] at com.MysqL.jdbc.StatementImpl.executeQuery(StatementImpl.java:1557)
2020-09-14T15:00:32.411168379Z: [ERROR] at com.MysqL.jdbc.ConnectionImpl.loadServerVariables(ConnectionImpl.java:3868)
2020-09-14T15:00:32.411172480Z: [ERROR] at com.MysqL.jdbc.ConnectionImpl.initializePropsFromServer(ConnectionImpl.java:3407)
2020-09-14T15:00:32.411179480Z: [ERROR] at com.MysqL.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2384)
2020-09-14T15:00:32.411183580Z: [ERROR] at com.MysqL.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2153)
2020-09-14T15:00:32.411187681Z: [ERROR] at com.MysqL.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:792)
2020-09-14T15:00:32.411191981Z: [ERROR] at com.MysqL.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
2020-09-14T15:00:32.411196181Z: [ERROR] at sun.reflect.GeneratedConstructorAccessor36.newInstance(UnkNown Source)
2020-09-14T15:00:32.411200282Z: [ERROR] at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
2020-09-14T15:00:32.411204382Z: [ERROR] at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
2020-09-14T15:00:32.411208482Z: [ERROR] at com.MysqL.jdbc.Util.handleNewInstance(Util.java:411)
2020-09-14T15:00:32.411212483Z: [ERROR] at com.MysqL.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:381)
2020-09-14T15:00:32.411216483Z: [ERROR] at com.MysqL.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:305)
2020-09-14T15:00:32.411220583Z: [ERROR] at org.apache.commons.dbcp.DriverConnectionFactory.createConnection(DriverConnectionFactory.java:38)
2020-09-14T15:00:32.411224684Z: [ERROR] at org.apache.commons.dbcp.PoolableConnectionFactory.makeObject(PoolableConnectionFactory.java:582)
2020-09-14T15:00:32.411228784Z: [ERROR] at org.apache.commons.dbcp.BasicDataSource.validateConnectionFactory(BasicDataSource.java:1556)
2020-09-14T15:00:32.411232884Z: [ERROR] at org.apache.commons.dbcp.BasicDataSource.createPoolableConnectionFactory(BasicDataSource.java:1545)
2020-09-14T15:00:32.411237085Z: [ERROR] ... 32 more
，而不是MIDDLEWARE。
我看到MIDDLEWARE_CLASSES仍受支持。但是我不明白为什么要使用它。它是否可以直接通过使用process_view的标准中间件添加任何东西？
在此流程中何时甚至会调用此get_response？
解决方法
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